W5M33 Preload & Bearings

Here is some info for those of you brave enough to pull your own box apart :thumbsup:
All info comes from Tim Zimmerman ( twicks69 ) on the dsmtuners forums etc.
He has been playing with these boxes for a long time and knows his stuff people!
http://www.tmzperformance.com/

Here are the specs he has posted. Please don't argue about them, all I am doing is reposting specs which have been proven to work for the various scenarios listed!


The following is for W5M33 AWD 5-speed transmissions:

Ok, stock specs are:

The Preload Setting is listed in SAE (inches):

Input Shaft --> 0.000" - 0.002" ENDPLAY
Intermediate Shaft --> 0.003" - 0.005" PRELOAD
Center Differential --> 0.003" - 0.005" PRELOAD
Output Shaft --> 0.003" - 0.005" PRELOAD
Front Differential --> 0.002" - .0067" ENDPLAY

These are what I normally use:

Stock/Street Transmissions with less than 400TQ at the crank:

Input Shaft --> 0.004" - 0.007" PRELOAD
Intermediate Shaft --> 0.005" - 0.007" PRELOAD
Center Differential --> 0.005" - 0.007" PRELOAD
Output Shaft --> 0.003" - 0.005" PRELOAD
Front Differential --> 0.002" - .0067" ENDPLAY

Street/Strip Transmissions with less than 600TQ at the crank:

Input Shaft --> 0.005" - 0.007" PRELOAD
Intermediate Shaft --> 0.007" - 0.009" PRELOAD
Center Differential --> 0.005" - 0.007" PRELOAD
Output Shaft --> 0.003" - 0.005" PRELOAD
Front Differential --> 0.002" - .0067" ENDPLAY

All out RACE Transmissions that are Rebuilt/Inspected regularly with more than 600TQ at the crank:

Input Shaft --> 0.007" PRELOAD
Intermediate Shaft --> 0.008" - 0.010" PRELOAD
Center Differential --> 0.005" - 0.007" PRELOAD
Output Shaft --> 0.004" - 0.006" PRELOAD
Front Differential --> 0.002" - .0067" ENDPLAY

For Extremely HIGH HP/TQ transmissions (As in ~900-1000+TQ at the crank):

Input Shaft --> 0.007" PRELOAD
Intermediate Shaft --> 0.010" - 0.012" PRELOAD
Center Differential --> 0.005" - 0.007" PRELOAD
Output Shaft --> 0.004" - 0.006" PRELOAD
Front Differential --> 0.002" - .0067" ENDPLAY



These figures are normally what I use, unless a customer has a specific number they want to run for shims.

As well, each transmission rebuilder will shim differently, or not even reshim whatsoever (reusing stock shims). Most transmission rebuilders will not tell you these numbers whatsoever, as this is what makes their transmissions shift like butter with all the other mods that they do to the shift rails, hub and sliders, gears, linkage, etc.

I would recommend using a quality Micrometer that is accurate to 0.0001", and I normally do two or three seperate solder-tests per bearing race and then take the average of each test to see if there is anything out of the ordinary, and then I select the shim by adding the preload figure listed above to the solder average thickness, or subtract the endplay figure listed above from the solder average thickness.

If you need the part number for a shim, reference a factory service manual for all the part numbers of shims for each transmission model.

Gearbox bearing part numbers...
These are the generic numbers for the W5m33 gearbox bearings.
Where the listing says inner I mean the flywheel side of the box and outer means the other end!

Input Shaft:
Outer bearing: Koyo 26118YR1-N
Outer Race: Koyo 26283-N
Inner bearing: NSK HR32205
Inner Race: NSK HR32205

Intermediate shaft:
Outer bearing: NSK R28-9
Outer Race: NSK R28-9A
inner bearing: Koyo 303/28R-N
inner race: Koyo 303/28-N

Center Diff case:
Outer bearing: Koyo LM300849
Outer race: Koyo LM300811
Inner bearing: NSK R41-1g
Inner race: NSK R41-1g

Center diff drive shaft:
Outer bearing: NSK R31Z-11g
Outer Race: NSK R31Z-11g
inner bearing: Koyo 32009JR
inner race: Koyo 32009J

Frt Diff bearings:
Koyo 6207R (Qty 2)

Mitsubishi part numbers for these ...

Input - MD732314
Input - MD726235

Intermediate - MD726236
Intermediate - MD724117

Center Diff case - MD727860
Center Diff case - MD720623

Center diff drive shaft - MD718322
Center diff drive shaft - MD727861