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Thread: true trac writeup
08-20-2005, 04:14 AM #21
i just finished doing this swap on my diff, a few notes from my experience:
if you are using the same gearset you removed, you can reuse the spacer washers from the pinion and gear side of the carrier
the spacer washer on the other side will probably need to be thinner, as the truetrac housings on average are a little wider than the stock LSD
the 'cap' on the carrier bearing race on the 'gear' side has a funny marking on the top of it, if you get them mixed up
USE NEW CRUSH WASHERS
if you are replacing the bearings, get a shop to take off the inner pinion bearing from the pinion shaft, the outer one comes off when you take out the pinion, and the carrier bearings are not reused - then put the new races in an ice bath with salt to cool them off (or put them in the deep freeze overnight) and they almost drop in with very little tapping required
follow the TSRM instructions for installing the pinion the first time (no slinger or spacer) and use some gear marking compound to check the contact area - if it checks out with all the spacer washers in place, you are good to go as far as backlash is concerned, and the checking distance should not be an issue, if you reuse the same gears and use the same pinion spacer washer
finally, you can use gear oil without friction modifier - like red line 75W90NS racing gear oil, or similar since the truetrac is a torsen unit and doesnt need any friction modifier'84 P-type, 5spd, torrid red, black/grey leather
Built 7MGTE (JE's, ARP studs, MHG), BOSS STG4 60mm, AEM standalone, R154, 2 1/2" IC and 3" turbo back - the works
Coilovers, ROH wheels, 4 corner BBK, Konis, ADDCO bars, PST bushings etc. etc.
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08-20-2005, 12:58 PM #22Originally Posted by bbaacchhyy
If Jeff can't ship international, I could pick them up for you and ship.
08-20-2005, 02:18 PM #23Originally Posted by williamb82
The $150.00 for the Toyota parts was list price - 25%. My cost at the time. The prices may very well have gone up since then. All parts are stock MKII diff. parts with the exception of the carrier bearings.
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08-20-2005, 02:47 PM #24
A few helpful hints:
1. Use a stock MKII diff. case that contains the desired gear set ratio that you want. The original diff. assembly has been machined for it's "original" gear set and the pinion shaft depth has been set accordingly at the factory. This will help reduce any possible need to have to adjust the pinion shaft depth.
2. You must use a matched ring and pinion gear set that has minimal wear and is otherwise suitable for reuse.
3. The inner pinion bearing must be replaced with the exact same new bearing in order to allow for using the same inner pinion bearing shim. This will keep the pinion shaft depth the same as it was before. (very important!)
4. You will most likely need a small assortment of carrier adjusting shims in order to achieve both the proper ring and pinion backlash and carrier bearing preload. You must get these two parameters dead on the money! (very important!)
5. The pinion shaft bearing preload changes rapidly once zero endplay is reached by tightening the pinion shaft nut. Use a long breaker bar on the pinion nut to provide plenty of leverage to crush the sleeve. Pinion bearing preload will increase rapidly with only small tightening increments once zero endplay is reached. If you go to far and preload the pinion bearings beyond spec., you'll need to start over with a new crush sleeve. Do not back off the nut to decrease the preload! (very important!)
6. Check the pinion shaft and ring gear for runout using a precision dial guage
7. Be sure to check the contact pattern of the ring and pinion gear teeth. Replacing the inner pinion bearing with an "exact" replacement and retaining the stock pinion shaft shim is very crucial for this step!
08-21-2005, 02:58 PM #25
I can provide the parts, and will ship internationally. Please e-mail firstname.lastname@example.org for a shipping quote.
08-21-2005, 04:44 PM #26
08-21-2005, 05:52 PM #27
08-21-2005, 10:25 PM #28
11-10-2005, 05:53 PM #29Bay_707Guest
true trac part number
called reider racing and said that this is a front differential and that using it in the rear might void the warranty?
11-10-2005, 06:49 PM #30
dont know if it voids the warrenty or not but thats the right one. its for the front of a toyota 4x4 truck with ifs and 7.5in diff. don lew has had the older style truetrac in his car for several years and autocrosses on it competivly and ive had mine the newer style for over a year with no problems.
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