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  1. #1
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    2.5 gearbox vs 3.3 gearbox and 3.3 diffs vs. 2.5 diffs

    ok im in the process of building a nasty 3.3 trans, i ordered the 3.3 gearbox halfs, forward only, and metal gears...

    1. is there a difference between the 3.3 gearbox halfs and the 2.5 ones, strength, placement, ect.

    2. can i use all the shafts from my 2.5 trans to use the 3.3 metal gears, or will i need any new shafts if so what ones

    3. do i use grease if so what kind and how much

    4. i opened up my 2.5 diffs and they seem pretty beefy and ive never broke one in 3 tmaxxs ive owned now, whats the difference between then 3.3 diffs and the 2.5 diffs, if there is a big difference i may beef those up to, or should i just leave those alone...

    also let me know if there is anything ill need other then what i have listed here....

    my gears, trans case, and forward only come in tomorrow btw...
    Last edited by kuskye25; 01-04-2012 at 06:31 PM.
    Traxxas is good, but so are other Manus

  2. #2
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    You won't be using anything from the black trans, except maybe some bearings.

    The 3.3 diffs are superior in every way.

    There's one problem though. The "3.3" trans comes in two flavors. One has a 5mm output, the other has a 6mm out. Hopefully you got the 6mm foc.

    There is also a problem with diffs, since there are three 3.3 maxxes. # 4909, 4908, and 4907. The 4909 has old diffs like yours, the other 2 have sealed "revo spec" diffs.
    erbe emaxx 26maxx s27revo 18tmrevo XXL platinum

  3. #3
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    i have all these spare so ill be building up the trans, and possibly diffs, from spare 2.5 parts, then ill rip my truck apart and install the new, and have fully fuctioning spares coming out to sit around just incase.
    Traxxas is good, but so are other Manus

  4. #4
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    here is what im working with not that you dont know what the parts look like but i love pics on threads, its like reading a book without pics just doesnt hold my interest as much, hahaha


    ill be updating this build as it goes down, and like everyhting else i do to my rc's it happens as fast as possible, hahah
    Traxxas is good, but so are other Manus

  5. #5
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    Quote Originally Posted by lubecakes View Post
    You won't be using anything from the black trans, except maybe some bearings.

    The 3.3 diffs are superior in every way.

    There's one problem though. The "3.3" trans comes in two flavors. One has a 5mm output, the other has a 6mm out. Hopefully you got the 6mm foc.

    There is also a problem with diffs, since there are three 3.3 maxxes. # 4909, 4908, and 4907. The 4909 has old diffs like yours, the other 2 have sealed "revo spec" diffs.
    ok so i will be needing new shafts, http://www3.towerhobbies.com/cgi-bin...?&I=LXMJF6&P=Z that is the halfs i bought...

    this is the foc i got, http://www3.towerhobbies.com/cgi-bin...?&I=LXCNA8&P=7
    Traxxas is good, but so are other Manus

  6. #6
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    ok as far as i see the foc i got is for the 2.5 so its wrong id assume, so itll go into my left over black trans.

    so what shafts do i get for the hole trans including the foc, in accordance with the gearbox halfs i bought or are those not right as well.... and what grease if any and how much grease do i use..

    also what clutch will i be buying then as i assume that wont follow thru from the 2.5 either
    Last edited by kuskye25; 01-04-2012 at 07:18 PM.
    Traxxas is good, but so are other Manus

  7. #7
    RC Turnbuckle Jr. Snook Man's Avatar
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    The foc you got will not fit the 3.3 transmission case. The black tranny uses entirely different gears and shafts compared to the grey transmissions.

    The grey transmission halves are all the same. Which brand metal gears did you purchase and what model 3.3 were they for?
    Last edited by Snook Man; 01-04-2012 at 07:18 PM.
    No slipper/tall gearing/power = broken parts.

  8. #8
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    Quote Originally Posted by Snook Man View Post
    The foc you got will not fit the 3.3 transmission case. The black tranny uses entirely different gears and shafts compared to the grey transmissions.

    The grey transmission halves are all the same. Which brand metal gears did you purchase and what model 3.3 were they for?
    yeah i saw that thanks, if you have the time can you let me know what all ill want to by part# wise to fill the rest of this up, other then gears and case, that is assuming the case i got is correct as well.
    Traxxas is good, but so are other Manus

  9. #9
    RC Turnbuckle Jr. Snook Man's Avatar
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    Need more info to lead you in the right direction.
    What brake setup do you intend to use on the 3.3 transmission? and what chassis do you intend to use, stsndard or extended? The output shaft size and length will vary depending on which direction you want to go.
    No slipper/tall gearing/power = broken parts.

  10. #10
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    Quote Originally Posted by Snook Man View Post
    Need more info to lead you in the right direction.
    What brake setup do you intend to use on the 3.3 transmission? and what chassis do you intend to use, stsndard or extended? The output shaft size and length will vary depending on which direction you want to go.
    its the truck in the pic, i know that prolly doesnt help was just making sure you knew, its the standard sized frame, and as far as brakes i just have stock 2.5 ones to use
    Traxxas is good, but so are other Manus

  11. #11
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    id like to leave the truck so that if i have issues with the trans i can swap my 2.5 trans back in so i can work on the new one and its always good to run if i wish
    Traxxas is good, but so are other Manus

  12. #12
    RC Turnbuckle Jr. 08kgraves's Avatar
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    i think you have to extensively mod the chassis to fit the grey trans and driveline on it. but snookman would know for sure so i will leave it all up to him for clarification.
    there's no life like a LOW LIFE!
    Drag It!

  13. #13
    RC Turnbuckle Jr. Snook Man's Avatar
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    With the 3.3 transmission you will need the 3.3 slipper clutch assembly and spur gear, and the 3.3 brake setup (2 different setups)
    You will want the 4909 brake system and output shaft for ease of installation/swap with the short chassis.
    The top (slipper) shaft and middle (primary) shaft remain the same in all 3.3 transmissions.
    Slipper shaft part # 5366
    Primary shaft part # 5393
    Output shaft part # FOC 5195
    Exploded view of the 4909 transmission.
    http://traxxas.com/sites/default/fil...ssion-2007.pdf
    If all you purchased was the 3.3 tranny housing you will need a few more parts as well. Brake post, arm, OWB 2nd gear bearing, clutch hub and all the brake components. Easy to look up in the exploded view.
    No slipper/tall gearing/power = broken parts.

  14. #14
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    Quote Originally Posted by Snook Man View Post
    With the 3.3 transmission you will need the 3.3 slipper clutch assembly and spur gear, and the 3.3 brake setup (2 different setups)
    You will want the 4909 brake system and output shaft for ease of installation/swap with the short chassis.
    The top (slipper) shaft and middle (primary) shaft remain the same in all 3.3 transmissions.
    Slipper shaft part # 5366
    Primary shaft part # 5393
    Output shaft part # FOC 5195
    Exploded view of the 4909 transmission.
    http://traxxas.com/sites/default/fil...ssion-2007.pdf
    If all you purchased was the 3.3 tranny housing you will need a few more parts as well. Brake post, arm, OWB 2nd gear bearing, clutch hub and all the brake components. Easy to look up in the exploded view.
    cool man much thanks, you saved me a few more headaches that id have put myself into apparently, haha, you know your stuff snook man... and i really appreciate the time taken to help me out, its why i try my hardest to help others out on the forum
    Last edited by kuskye25; 01-04-2012 at 07:51 PM.
    Traxxas is good, but so are other Manus

  15. #15
    RC Turnbuckle Jr. Snook Man's Avatar
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    Your welcome...
    Using the 4909 tranny/brake will require you to dremel the chassis slightly for clearance of the front brake caliper. If using the stock 2.5 center slider shafts no other mods will be needed. If you choose to use the larger 3.3 center shafts you would need to dremel the chassis front and rear for clearance and loose the mounting position for the throttle servo rear mount which most then will relocate as a direct pull.
    No slipper/tall gearing/power = broken parts.

  16. #16
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    Just my 2 cents , but print out all the exploded views. Put them in a binder for reference.

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    Keep the shiny side up!

  17. #17
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    Quote Originally Posted by Snook Man View Post
    Your welcome...
    Using the 4909 tranny/brake will require you to dremel the chassis slightly for clearance of the front brake caliper. If using the stock 2.5 center slider shafts no other mods will be needed. If you choose to use the larger 3.3 center shafts you would need to dremel the chassis front and rear for clearance and loose the mounting position for the throttle servo rear mount which most then will relocate as a direct pull.
    cool thanks for the heads up on where to modify
    Traxxas is good, but so are other Manus

  18. #18
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    do the 3.3 diffs require anything other then getting them and installing them, will they hook right up to my 2.5 shafts for the time being
    Traxxas is good, but so are other Manus

  19. #19
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    ok i think i have found everything, take a look when you get time snook man, see if ive missed anything i dont believe i have but its possible

    5195 Traxxas Forward Only Conversion Kit
    1 $ 11.99
    5366 Traxxas Transmission Input Shaft Revo
    1 $ 3.89
    5393 Traxxas Shaft Primary Revo comes with owb
    1 $ 24.49
    5390 Traxxas Clutch Assembly Primary Revo
    1 $ 13.49
    4967 Traxxas Brake Cam/Parts T-Maxx
    1 $ 5.99
    5365 Traxxas Brake Pad Set Revo
    1 $ 7.29
    4978 Traxxas Button Head Machine Screw 3x21mm Revo (6)
    1 $ 2.50
    5164 Traxxas Brake Disc 42mm Steel
    1 $ 2.50
    Traxxas is good, but so are other Manus

  20. #20
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    Quote Originally Posted by Snook Man View Post
    The foc you got will not fit the 3.3 transmission case. The black tranny uses entirely different gears and shafts compared to the grey transmissions.

    The grey transmission halves are all the same. Which brand metal gears did you purchase and what model 3.3 were they for?
    sorry i didnt see you asked what gears did i purchase, these are what i purchased, http://www3.towerhobbies.com/cgi-bin...&I=LXSDP9&P=ML
    Traxxas is good, but so are other Manus

  21. #21
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    Traxxas is good, but so are other Manus

  22. #22
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    let me reword that diff question, will the revo diffs mount right into my 2.5 setup, ive looked at the diff case and it seems alot different... are different bulks required or anything
    Traxxas is good, but so are other Manus

  23. #23
    RC Turnbuckle Jr. Wildman4910's Avatar
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    Yes all the T/E maxx diffs are interchangeable.
    Look out for the tree/crunch!

    LiPo? Naw NITRO!!

  24. #24
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    Quote Originally Posted by Wildman4910 View Post
    Yes all the T/E maxx diffs are interchangeable.
    ok cool so its jsut the internals that are different, ill find what i think i should buy and post it and see if thats correct
    Traxxas is good, but so are other Manus

  25. #25
    RC Turnbuckle Jr. Wildman4910's Avatar
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    The cases are different too as the newer(revo spec) cases have 4 screws instead of 2 but other then that they are a direct fit.
    Old 2 screw case diff.


    New 4 screw diff case.
    Look out for the tree/crunch!

    LiPo? Naw NITRO!!

  26. #26
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    I understand they interchange, but is there anything more desirable about ones from the BL Emaxx vs a 4907?

  27. #27
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    Quote Originally Posted by Wildman4910 View Post
    The cases are different too as the newer(revo spec) cases have 4 screws instead of 2 but other then that they are a direct fit.
    Old 2 screw case diff.


    New 4 screw diff case.
    ok as you can see in my pic the ones on the table are 4 screw, the ones in my turck now are 4 screw, and i have 3 other spares that are 4 screw, so does this mean i may have newer 3.3 diffs, or just the case
    Traxxas is good, but so are other Manus

  28. #28
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    ok i found one i have that only has two screws on the case, the internals are the exact same, so im wondering what makes the 4 screw ones "superior in every way" is how lubecakes said it. im confused, hahaha

    gears directly inside the housing look the same and the spider gears inside the accual diff are the same
    Traxxas is good, but so are other Manus

  29. #29
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    the only thing i see different is there is a metal support to help the metal pin with the spider gears, if thats the case i wouldnt say they are superior in every way they have 2 extra screws on the case to keep it sealed better, and a extra support for the spider gears inside the diff, is this all, im sure it helps alot, i just figured it was more then that....

    ok i finally found a exploded view of the emaxx vs. tmaxx 3.3 diffs, and the part numbers are different but the only thing i see thats different is a metal support for the spiders, and a little better sealing
    Last edited by kuskye25; 01-05-2012 at 12:36 AM.
    Traxxas is good, but so are other Manus

  30. #30
    RC Turnbuckle Jr. 08kgraves's Avatar
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    there is a 4 screw case that is sealed with the blue gasket. to my understanding thats the best one. the extra screws on the case keep it from flexing so less chance of stripping the gears because they cant try to seperate. maybe you would be intrested in looking at the gears on the flm website. they have moded stock gears that are held together with 4 screws vs. 2 or something like that.
    there's no life like a LOW LIFE!
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  31. #31
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    Quote Originally Posted by 08kgraves View Post
    there is a 4 screw case that is sealed with the blue gasket. to my understanding thats the best one. the extra screws on the case keep it from flexing so less chance of stripping the gears because they cant try to seperate. maybe you would be intrested in looking at the gears on the flm website. they have moded stock gears that are held together with 4 screws vs. 2 or something like that.
    well like i said all mine are the 4 screw design..... even the ones on my os18tm, so i guess that guy had updated it, i prolly wont mess with moding them if they are the newer diffs, plus i have 3 spares....
    Last edited by kuskye25; 01-05-2012 at 10:49 AM.
    Traxxas is good, but so are other Manus

  32. #32
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    Quote Originally Posted by kuskye25 View Post
    ok i finally found a exploded view of the emaxx vs. tmaxx 3.3 diffs, and the part numbers are different but the only thing i see thats different is a metal support for the spiders, and a little better sealing
    The only difference between the T and E-Maxx diffs is the cup and the support beam. IMHO a worthwhile upgrade to get. The rod for the spider gears would cut into the cup and I would have to replace it. With the E diffs, no issues and no signs of wear after a few gallons.
    The Super Derecho

  33. #33
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    Quote Originally Posted by Double G View Post
    The only difference between the T and E-Maxx diffs is the cup and the support beam. IMHO a worthwhile upgrade to get. The rod for the spider gears would cut into the cup and I would have to replace it. With the E diffs, no issues and no signs of wear after a few gallons.
    ok cool yeah i figured the extra support to the spiders would help, and the extra sealing
    Traxxas is good, but so are other Manus

  34. #34
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    5366 Traxxas Transmission Input Shaft Revo
    1 $ 3.89

    5393 Traxxas Shaft Primary Revo
    1 $ 24.49

    5390 Traxxas Clutch Assembly Primary Revo
    1 $ 13.49

    4068 Traxxas Brake Cam/Parts T-Maxx
    1 $ 5.99

    5365 Traxxas Brake Pad Set Revo
    1 $ 7.29

    4978 Traxxas Button Head Machine Screw 3x21mm Revo (6)
    1 $ 2.50

    5164 Traxxas Brake Disc 42mm Steel
    1 $ 2.50

    5181 Traxxas Gearbox Halves Front/Rear
    1 $ 9.69

    5116 Traxxas Ball Bearings 5x11x4mm Revo (2)
    3 $ 3.50

    2552 Traxxas Screws Countersunk Machine 3x12mm Revo (6)
    1 $ 2.50

    5117 Traxxas Ball Bearings 6x12x4mm Revo (2)
    2 $ 3.89

    5119 Traxxas Ball Bearings 10x15x4mm Revo (2)
    1 $ 6.79

    5352x Traxxas Slipper Clutch Rebuild Kit Revo/T-Maxx
    1 $ 7.29

    5351 Traxxas Slipper Pressure Plate & Hub Alloy Revo
    1 $ 7.79

    2554 Traxxas Back Plate Screws TRX 2.5 (6)
    1 $ 2.39

    3956 Traxxas Spur Gear 0.8P 54T Jato
    1 $ 3.00

    5195 Traxxas Forward Only Conversion Kit
    1 $ 11.99

    8002 Robinson Racing Steel Gear Forward Only Revo/T-Maxx 3.3
    1 $ 99.99


    ok this is everything i have or have ordered, let me know if im missing anything...
    Last edited by kuskye25; 01-05-2012 at 03:26 PM.
    Traxxas is good, but so are other Manus

  35. #35
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    this will be a beefy brand new bearings and all 3.3 trans when im done.....
    Traxxas is good, but so are other Manus

  36. #36
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    i was able to sell $125 worth of stuff i wasnt using including those junk integy a-arms at the hobby shop, so this trans wont be to huge of a hit to my pocketbook.

    the rest of my parts get here on Tues, USPS priority, i cant wait... ill have right around $100 in this build give or take a few bucks, not to shabby
    Last edited by kuskye25; 01-05-2012 at 03:05 PM.
    Traxxas is good, but so are other Manus

  37. #37
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    the clutch bell i have on the engine now is the 4122, 22t, now the spur is going down in teeth alot from my 2.5 setup, i believe i use a 70 or 72t spur normally, what difference in preformance is this going to make... id like it to stay about the same as my 2.5 setup..

    could i just go with a bigger pinion, or should i get a bigger spur, i didnt think about this before i ordered my new stuff, but its not a bad idea to have a extra spur on hand if thatll fix my issue....

    or is the new trans gears different enouph to compensate this, and itll wind up the same high end speed and low end torque as my 2.5 setup was...
    Last edited by kuskye25; 01-05-2012 at 03:48 PM.
    Traxxas is good, but so are other Manus

  38. #38
    RC Turnbuckle Jr. 08kgraves's Avatar
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    you can click on the maxx, then classic or 3.3 and go to specs. it will tell you the gear ratio for each gear so you can compare.
    there's no life like a LOW LIFE!
    Drag It!

  39. #39
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    Quote Originally Posted by 08kgraves View Post
    you can click on the maxx, then classic or 3.3 and go to specs. it will tell you the gear ratio for each gear so you can compare.
    i knew those, thanks though lots quicker place to reference the basics, i was wondering about my RR gears i have they say standard ratio so i guess that means they are the same as the stock 3.3 ones i just wanst sure cause their site doesnt give the exact ratio, in that case i should have gotten a bigger spur, ill just drop the trans in thoguh at this point, and if its still wheeling on command ill be happy, as according to the ratios ill be picking up a little top speed which never hurts...

    if it totally kills the wheelies, which id assume it wont with the short chassis i have, ill drop on a bigger spur
    Last edited by kuskye25; 01-05-2012 at 10:30 PM.
    Traxxas is good, but so are other Manus

  40. #40
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    With a 3.3 I wouldn't spend the cash on RR gears, but that's just me. At least you'll have them for later
    erbe emaxx 26maxx s27revo 18tmrevo XXL platinum

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