YR4 diffs ?

[Justjoe]

Which YR4 differential will work with the YZ10/870C stock bulkheads? was looking at some integy setups and they make them for the YR4M and the YR4MII different P/Ns need to know which will work.

Thanks

[prp]

Hi , normally all the YR4 have the same diff...I'm sure for the first YR4 car, the diff are the same with 870C.

[Justjoe]

Ok ...I had posted this question about diffs for the YZ10 and the YR4 asking if they were the same. I got a set of YR4 diffs in today and they are 33 tooth pulleys and mine on the car are 35's. I also noticed that PBR was looking for 33 tooth pulleys for his 1994 in his post, and the post of the YZ10 pulley pics were 35 tooth. asls the outdrives I recieved have about a 2MM difference in the offset of the pulley towards the center of the chassis. Does anydody know when or what year they changed the diffs. Mine is a late 1990 early 1991 car.

Thanks
Joe

[prp]

The 870C diff are the same on YR4 with Alloy bulkhead (1st generation small red shock), but for the YZ10 from 94 they're new diff more short with different spur on...

[Justjoe]

OK I posted this when I was looking for Diff parts. I recieved a couple of the ones I ordered and here they are.

On set of diff halves are made of delrin by Integy I did not have a set of the smaller diff rings to put the other Integy diff gear on the delrin diff halves so I used the stogk rear gear for now...Trying to find the YR4 rings without the D cut. The front is an Integy delrin 35Tooth pulley and team suzuki aluminum diff halves...Also looking for another Aluminum set of diff halves for my second car build.