Mike, have you tried any different than stock bearings? I see The Gear Box is now offering Timken and "Koyo" that they're advertising as high capacity...but the Timken kit still costs more...I don't get it.

 

I've used Koyo before, no issues. They are owned by Toyota. I do make sure to replace the bearing and race together when switching brands..

 

I've used Koyo for years. Not a single issue with them either.

 

I guess I'll buy whichever of the 2 that I can find locally then, and yes I agree on matching a bearing and race to the same manufacturer.

Thanks guys.

 

This link is to the newest pdf with this information?

https://ls1tech.com/forums/14319275-post96.html

 

The PDF link will never change. Updated versions get uploaded and overwrite the previous.

http://www.eecis.udel.edu/~davis/z28..._Fbody_T56.pdf

Any other copies that may be floating around may not be current/correct.

 

Is there a difference in sizing between th400 slip yokes?
Are you specifically supposed to use an ssr slip yoke?

 

No difference in regard to the slip portion of the yoke. A SSR yoke will have the same slip barrel as the TH400, and a 3R factory u-joint. Spicer makes several; TH400 32-spline slip-yokes that have different u-joint spacing.

If you had a factory Fbody tailhousing bored for the SSR bushing/seal, it would have had to be checked/honed for the final fit before sealing it all up.

 

Well I have a th400 slip yoke from an older chevy truck and it will only slide in about 1 - 1.5 inches into the mainshaft before stopping/hitting.

My fbody tailhousing was machined to the ssr bushing/seal.

 

When it stops, is it still able to easily turn , indicating the interference is the splines .
Or is it hard to turn , indicating the interference is OD to bushing.

I had no problem with a used 400 yoke in my SSR trans used during install or the new MW billet yoke that is 400 spec
http://www.markwilliams.com/detail.aspx?ID=295

 

I bought a Strange U1664 and it fits my SSR housing and 32 spline main fine.

 

GMMGWS6 trans issue as I understand from talking to him is that his slip yoke will not go into the tail shaft housing. It starts to then stops. It also fits just fine on when a New th400 bushing is slid over it. It appears that the O. D of the slip yoke is fine just theres a problem with the splines or size of the shaft. Being the shaft and rear bushing/seal are an OEM M10 and the other new th400 bushing slides over it, it seems the slip yoke is to blame.

Has anyone had any problems getting a regular th400 bushing to fit on there ssr hybrid?

85mike. If checked the I. D. Of the M10 bushing and the th400 bushing and they appeard to be the same. Is there a special slip yoke that needs to be used?

Thanks. C. J.

 

Great info mike, I learned a bunch. I just have toi read it a few more times to get more if it.


What have you found on using the MN12 gears for drag racing a NA Fbody?

 

I have another question? Why is it that you chose to run the m10 bushing and seal in the rear vs using an off the shelf th400 bushing? Trying to get the parts for the m10 have been really hard and the th400 bushing and seal are really easy to come by. Not to mention they leave more meat on the tailshaft housing. The bushing I found was a 2.02" vs the 2.050" and had the same I. D. Any input on the reason would be greatly appreciated.

Thanks. C. J.

 

Just because a new loose bushing fits over the slip yoke it doesn't say the bushing fit in the housing isn't to blame.
The press fit of the bushing in the housing will change the bushing ID.

That is why I asked if the yoke turns freely or not

 

I understand the size change when pressing in the bushings. From what I understand is that his slip yoke "wont go in more then 1in."

 

the slip yoke goes in about 1 - 1.5 inches and then hits and stops.
the splines slip right in and the yoke is not damaged in any way.

 

Most stock F-body/GTO tailhousings for 27 spline output use are tough to get a bushing pressed into without it changing the i.d. like 95wagon said. The tools to get them in without deformation are still a crap-shoot and honing is the final answer like Mike said, although RSG even suggests forcing the yoke into their long-dimension bushing. So tapping it in is possible, but not in every case and getting a distant customer to do that is a completely uncomfortable phone call (had that happen with a box I did which easily took a stock yoke...)

The same thing that happens with those F/GTO parts is probably all that happened w/ the new bushing in the bored tailhousing for 32 spline use.

But on that note, Mike didn't you have a try-fail situation with a reaaally similar yoke that turned out to be for a t-case, not TH400?

 

Yes, when I was first testing the theory I asked a local trans shop for a TH400 yoke to test with and it wouldn't fit. Turns out it was a bolt-on yoke from a truck/4wd app and was just slightly larger since it didn't have to "slip".

 

I started with the M10 factory tail housing, then moved to machining the F-body tail and already had the spec's for the M10 bushing and seal..

I'd love to hear about parts with better availability/usefulness that I can add to the write-up.. Please PM/email me the Mfg/Model/etc. and dimensions and I can update the write-up.

thanks
mike