Instructions for building & installing UE Ultralite diffs ( NB: same part numbers are required for installing FLM Hybrid bulks, regards differential internals ).
Either buy the full 6 or 8 spider Ultralite Diff kit from Unlimited Engineering ( or ebay if you get lucky ), or just purchase the Ultralite cases.
6 spider kit SKU 13540
8 spider kit SKU 13540B
Left & Right side Housing ( case only ) SKU 13551
If you buy either full kit, skip to step 3.
Option A: head to ebay and purchase a couple ofna hyper 7 buggy bulkheads and differentials- you will only need the internals so the bulkheads themselves can be discarded or sold.
Option B: Head to ebay and purchase some Losi LST / LST2 differentials- case will not be needed so alloy or plastic option makes no odds.
Option C: Hit up google and locate the following part numbers:
HBSC8178 Hotbodies hardened differential x2
HBSC8028 Hotbodies 43t front/rear bevel ( ring ) gear x2
HBSC8030 Hotbodies 13t bevel ( pinion ) gear x2
XRA962081 X-Ray 8x10x0.2mm washers/ shims ( any brand will actually be fine, just that size ) x1
PTK-688-RSZZ Protek R/C 8x16x5mm bearings ( any brand is fine again, best quality you can afford ) x1
You will also require the following if using Traxxas stock driveshafts or cvds:
Rc-monster 1/8 diff output shaft ( or make your own by cutting the threads off of Traxxas part #5454 )
If you plan to use the stock center driveshafts then you will also require:
Rc-monster revo driveshaft coupler V2 steel ( 8mm bore ) for the differential input shaft x2
If you plan to use Traxxas center cvds you will require instead:
Rc-monster drivecup hardened steel- 8mm bore x2
NB: you can find the same type of item from many different brands such as Hotbodies and Ofna etc.
Admire all the parts you have purchased & remove from packaging ( I suggest you use a clean & tidy workbench or desk to work at, placing the parts on a sheet of white paper so small parts don't vanish ), or open up your Hyper 7 bulkheads and layout all the internal parts:
undo the 4 screws holding the ring gear to the diff cup:
Remove spider gear from shaft, slide out pin & remove shaft ( which has the built-in drive cup ). Replace pin into modified #5454 shaft or RC-M output shaft.