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Go to the source- Tom's differentials. For the iron diff's he is the only one making them still in the USA. Yukon are Randy's brand name and would be either reboxed Tom's or imported.

Here is a set of Tom's gears I set up. These are 5 cut. Look at the teeth on your gear set, if you can see the Toe end is shorter then the heel end they are 5 cut. If the heights are the same they are 2 cut but I don't recall any 2 cut on original vette gear sets. This is part of the build that...

Anyone have one? Good - Bad?

Well the spider type was one thing, a steel cap on the RH side is just BS to sell someone something they don't need. I never believed in doing that or telling someone one thing and then not doing it. To each his own but some of those threads on custom diff's have really pushed the limit of...

The date code is 9/1973 so they should be 5 cut but the teeth appear equal- it just be my viewpoint. Drive is deep. Coast on the toe. If you can't get better adjustment and those are 5 cut I wouldn't use them.

There is a lot on that thread geared toward sales. In the old days we called it BS but that isn't correct anymore. Buyer beware is all I can offer. The cut gears are track proven for 50 years.

That is very interesting to see how you are loading the RG. I made a simple tool that bolts into the yoke and I can apply and vary the loading while patterning. Whose gears are you using? I didn't go back to see where and what you. 025 shim is thin for GM gears but could be right for...

Sounds like you have it under control.

I like the work area you have. Some observations if I may. I like to mill the cross shaft bolt pad down 100"-.120" to give more support to weak side on the bolt. I have seen the bolts break there and break out the side of the posi case. I like to really polish the OD and ID of the case along...

I don't know about that. I'll stick with the NOS ones I have.

IF you can feel a step with your finger nail I wouldn't use them. If not then you might be able to. Depending on your application you can use the 18's. I have tuned posi's with them for guys who didn't want to upgrade to 17's and didn't plan on aggressive driving. So if the 18's look better...

Looking back over the 2nd picture- Check the pinion OD for a groove where the seal rides. If your finger nail catches in it then you need a speedy sleeve or new yoke. There is also a small shim shown, I am assuming it is for the crush sleeve. You don't shim those, they should be crushed for...

My new email for corvettes is [email protected]

Hi I just stopped by and saw this. First off there is no 410 ratio for a vette, there is a 411 really not much of a difference. Just as GM never had a 373 for vette it was a 370. The 373 has more teeth and it stronger in my opinion. The difference between the 3 series and 4 series is the...

When the posi is correctly tuned, you can move the posi into any position on the bench- up ,down, sideways, on an angle and the cross shaft should slide out in any position. There should be no lash and no binding.

6-10 is ok. Hell there are some vendors telling their customers .100" is ok. If the posi is correctly tuned then the cross shaft will slide out with the posi in any position.

I just saw this so it might be to late to reply but here goes. There was no GM spec on the axle endplay and stock built posi's to date are all over the place. I had in a new loaded,assembled in Mex, posi. Once I removed the huge springs there was over 030 endplay in the clutch stack alone...

I have plugged dozens of supports over the years. That just doesn't work. One that came in was drilled, probably with a diamond, through the race!

Hi Gene, well a lot depends on the setup and grease used 20 years ago. The greases used the past 20 years are a lot better then the type used in 1972. I read all the time on various forums where guys say to break them down and regrease them. Clearly they have never worked successfully on 63-82...

Just read you solved the problem, good deal. Like I said I now recommend 2 bottles in a new rebuilt diff with tuned posi. Never had to use 2 before the new additive hit the market a couple of years ago. I would still get the alignment done too. So you like the feel of the blueprinted box...