I have an ITR transmission and I would like to use the LSD from it in my GSR transmission. If I transfer the GSR ring gear to the ITR lsd can I keep everything else on the diff like the bearings and the speed gear?

 

If your GSR is a hydro 1994-2001 then yes you can use the ITR LSD. You will need to use the correct shims for the bearing type and check the preload. The 94-97 used tapered roller bearings and 98-01 used ball bearings.

 

they are both hydro. The GSR tranny is from a 95 jdm gsr and the ITR tranny is from a 2001 jdm ITR. Should I order the bearings for a 95 GSR or do I just order shims? and how do I check preload? thanks for your help.

 

I would keep the ITR ball bearings and just replace the shim. The preload shim comes in various sizes, start with the 1.45mm shim OEM # 41454-PL3-B00 (Ref #10) and see how it fits. An easy way to check the bearing preload is to install only the LSD with the bearings and shim (no shafts) and close the cases with a few bolts. You should be able to spin the differential freely but it should not move back and forth in the housing. You may need a different size shim if it feels too loose or too tight. The factory service manual shows how to measure for the shim with a feeler guage but the 1.45mm shim works fine 90% of the time.

 

okay I think I've got it. I will give it a shot and report back. thanks for all the info.

 

I opened up the 95 GSR transmission and I noticed that the differential has tapered roller style bearings like you said earlier. But the casing didn't have shims in it. Do the tapered bearings not use shims? And do I just pop out the taper inserts on either side of the casing with a screwdriver to make way for the ball bearing set up?

 

http://www.xm-parts.com/articles/hgear/gear.htm
Thank me later. scroll down and he explains what to do exactly. I just did this about 3 days ago. Werry simple. Oh and make shure you measure out ure shim clearances werry werry good. I have 3 shims laying around now lol. 3x15$ each lol.

 

They have shims. It's just not the c-clip shim you're probably thinking it is. It'll be easier for you, with your experience (not a dig, btw!), to just switch over to the enclosed ball bearings for the new diff going in. It'll be easier to shim the diff correctly with those.

Good luck. And don't just rush through the job. Play around with everything a bit to try and get a better understanding of what's going on with it. You'll enjoy it more, and probably gain more reward from doing it yourself.

 

Awesome info and pics! Thank you!! This all makes a lot more sense.

 

I took out the outer race on the gear housing side and saw the shims. I can see how shimming the old way would be difficult with the outer races pressed in. I will be taking my time with this. I have to send my casing out to get a good cleaning so I won't be opening up the ITR tranny until I get the GSR casing back. This is my first time opening up a transmission, thanks for all the help.

 

No problem. It helped me out alot to. Just take youretime. Its all werry easy and simple to do. Im done with my ls5th gear 1-4gsr and LSD diff thanks to that writeup.

 

I have been thinking it might be easier to just put the GSR mainshaft, countershaft and gears into the ITR transmission and just change final drive on the LSD. I did notice there is a shim inside the gear housing and I'm guessing that is for mainshaft thrust. How do you measure for that shim? I don't notice anyone anyone talk about it on final drive installations. Is it not as important as the differential preload?

 

gsr transmission teardown

 

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ITR transmission teardown

 

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I decided to use the ITR case because it was in much better condition and I didn't have to re shim it. I used the shift forks from the ITR because they came from that case, which seemed like a good idea. I don't have any pictures of swapping the ring rear. These pictures start with the diff reinstalled and the mainshaft and countershaft reinstalled.

 

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my helpers

 

The GSR gears feel so much better for boost. The ITR was good when I was only making 250whp but about 300 it becomes a PITA. It's also much better on the highway. Now it's time to go back to the tuner and shoot for 350whp.