View Full Version : back tires stopped working
03-11-2007, 09:35 AM
i was driving my e-maxx yesterday and i heard a loud snap when i was turning and now my truck is a front wheel drive now. everything looks good, the half shafts all look good. im thinking its something in the diff. what useally goes bad? and what can i upgrade for brushless specss while its torn apart. i havent opened anything yet i figured id ask first.
03-11-2007, 10:27 AM
tear it apart and find out, usually the first thing to do.
03-11-2007, 10:28 AM
It's more than likely the diff. I've heard of diff cups failing and such... The screws shearing off...
03-11-2007, 11:51 AM
humm....most likely the diff
03-11-2007, 11:56 AM
Wel it could also be a driveshaft going from the diff to wheels but its most likely the diff. Rip it out and take it apart and let us know what you find.
03-11-2007, 12:24 PM
the only think i can think of the help the spider gears from stripping is to run a spool in the rear because i have never hearo of any one killing a front diff with the stock motors, only rears.
03-11-2007, 01:56 PM
My truck stripped the 4 little screws in the rear diff. More than likely from 2-3 months of 2nd gear power wheelies in the street.
l held both back tires between my knees while the front tires just spun. The rear driveshaft was spinning but not the wheels. I knew it was the rear diff.
I wanted to get my truck back together quickly so I picked up a 3.3 rear diff on ebay for $10. I still am considering my heavy duty diff options b/c it is bound to happen again now that I have installed a HV-Maxx 6.5.
03-11-2007, 02:25 PM
i opened the diff and looks fine. can someone tell me how it should work with out taking the front off the truck.
03-11-2007, 05:33 PM
can someone tell me how it should work with out taking the front off the truck.
I'm a little confused...
It's gotta be either the drive shafts or the diff cup. If the drive shafts (rear and center) are fine, then it's got to be the diff.
This happened to me 3 times:
first the rear half shafts (happened many times, actually, until I upgraded to CVDs)
second was the diff cup (cup cracked and microscopic screws chopped in half) upgraded to a Maximizer Aluminum Diff Cup
and third time was the rear/ center half shaft (easy fix with spare rear half shaft cut to fit)
I can't think of any other reason for your front wheel drive if none of these problems exist on your truck. Otherwise, this is beyond my experience.
03-11-2007, 05:41 PM
i can hold both output shafts and i can spin the input shaft and that isnt good, somethings gotta be bad. should the big gear that has the 4 screws move manually? o and those 4 screws are still their. im think while its open to just chage to a spool cuz i dont race, is their downside to haveing a spool
03-11-2007, 07:26 PM
once I stripped the screw holes in the diff cup, the diff would work when there wasn't much tourque on it, but with more trouque it would just sit there. I would inspect it more carefully.
03-11-2007, 07:57 PM
It sounds like your diff is bad, probley the spiders take the 4 little screws out of the diff and remove the cup to check them. I just broke my diff last week and when it went it made a loud snapping sound. Also make sure the rear out-put on your tranny still spins, if so then itís your diff.
03-11-2007, 08:04 PM
the outputs still spin. so whats the downside to going with a spool
03-11-2007, 08:25 PM
Is the pinion gear (the gear that turns the big ring gear) in the diff striped? Thatís how mine was to the T. Could be the ring to. They might look ok at first but could be worn out making the teeth slip making the snapping sound. Thatís what I broke on mine. Itís cheaper to buy a new diff off e-bay then it is to buy the parts to fix.
You can get 3.3spec one for $10 i just got 3 of these my self work great! here is a link I got my diffs from him, realy great deal!
03-11-2007, 08:33 PM
You may lose some steering without a diff do to both rear wheels will be turning at the same speed in a turn, but I don't know i never used one.
03-11-2007, 08:55 PM
well im not sure of the names of the gear so i really dont wanna guess. but im gonna stop by the hobby shop after work tomrrow to see if they can see what im not seeing
03-11-2007, 09:26 PM
I used a spool not too long ago. With a good set of batteries it will easily spin out on you. You can do donuts on asphalt with a spool. But you better have upgraded drivelines or you'll be spending lots of $8 trips to the hobby shop. I went back to diffs because I get a lot more stability, but I would highly recommend Maximizer Aluminum Diff Cups (http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXNWS4&P=7) for a nice upgrade from stock, if you choose to stay w/ diffs, that way you don't have to worry about breaking those microscopic screws.
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