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Dsm trans preload specs (very useful info)

3rdstrikedsm

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Joined
Feb 17, 2008
Messages
3,402
Location
32159, FL
The following is for W5M33 AWD 5-speed DSM 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, feel free to PM me, or reference a factory service manual for all the part numbers of shims for each transmission model.
__________________

I saw this on another forum and thought it could be very useful for diy guys, You don't run across this type of info every day!
 

Street Surgeon

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Mar 3, 2004
Messages
941
Location
Omaha, Nebraska
Interesting read, who posted this if you don't mind my asking?
 

3rdstrikedsm

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Feb 17, 2008
Messages
3,402
Location
32159, FL
No this is performance related preloads as well as stock^^
 

3rdstrikedsm

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Joined
Feb 17, 2008
Messages
3,402
Location
32159, FL
Quoting Street Surgeon:
Interesting read, who posted this if you don't mind my asking?


A guy named Tim from CO, This was on the dsmlink forums and I figured since not everyone has access to that forum I would share it here as well.
 

3rdstrikedsm

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Joined
Feb 17, 2008
Messages
3,402
Location
32159, FL
Seems to be a well respected member on link forums with lots of tech input.
 

1qkfwd

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Joined
Sep 29, 2009
Messages
209
Location
Sun Valley, NV
Not only is he on the link forums he's on dsmtuners. His screen name i believe is twicks69. I've chatted with him quite a few times he's a good guy. He has had tons of dyno time on his 2g and lots of trans rebuilds on other cars to.
 

donniekak

Well-known member
Joined
Jan 1, 2009
Messages
748
Location
surprise az
Tim Zimmer. He does a lot of dsm transmissions, and broke many for a long time. Those are the preloads that about everyone uses. Good info for everyone to have.
 

curtis

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Joined
May 4, 2003
Messages
11,892
Location
Clarksville TN
Steve..... put this in a How to for future reference for sure. /ubbthreads/images/graemlins/applause.gif /ubbthreads/images/graemlins/applause.gif /ubbthreads/images/graemlins/applause.gif
 
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