BW T-10 Transmissions

[Ray C.]

Could someone please explain the differences of the internals for the Borg Warner T-10 for a B, C, and D main cases.

Thanks!
Ray #36314

[Joe M.]

Re: BW T-10 Transmissions

I'm about to switch internals from a t10C-1 to a t10D-1 I hope the answer to your question doesn't ruin my day.

The two trannys I have are different in this one obvious way, C case has a wide retainer and the D case has the small front retainer. D is dated Oct 62 while the C is about Dec 62.

Hope the internals otherwise are interchangable...hope hope hope

no comment on a B case

joe

[Joe L.]

Re: BW T-10 Transmissions

Ray-----

T-10-1B is a cast iron case and, I believe, pretty much the same as the -1.

T-10-1C is the first aluminum case. Functionally, I think it's interchangeable with the -1.

T-10-1D is the second design aluminum case. One difference between this case and the -1C is, I believe, the bolt pattern for the front retainer. It's smaller than that used for earlier (and, later, 1975+) T-10's.

[Ray C.]

Re: BW T-10 Transmissions

Thanks! Joe

Would you happen to know if the internals (moving parts) from the D-case work in the C-case. I checked the front retainer and they are different. I have secured the correct dated C-main case and tail case for my 61 project. I have a service replacement D-case transmission that I would like to transfer the internals to the C-case.

As Always, Thanks for your help!

Ray

[Joe L.]

Re: BW T-10 Transmissions

Ray-----

As far as I know, all of the internal parts are interchangeable AS A UNIT. However, I don't think that all parts are interchangeable on a "mix-and-match" basis. I'm not 100% sure about this, though.

[Ray C.]

Re: BW T-10 Transmissions

Thanks! Joe

Ray

[Timothy B.]

Re: BW T-10 Transmissions

Ray,

The bolt pattern for the front bearing retainer is the same on both cases, the diameter of the retainer changed, the 1963 D case uses the small retainer on corvettes and 421 bellhousing. The 1963 D case input gear is threaded with a left hand nut (that is peened to the threads) to retain the front bearing and the earlier input on C case uses a snap ring to retain bearing. I think Joe is correct that ALL as a unit can be changed but do yourself a favor and call one of the transmission rebuilders first.

I know for a fact that the D case uses a different cluster gear and a different toothed second gear to match this cluster gear so don't mix and match or you will be back. Other things to consider are the speedo drive gear/rear axle you will be running and how much wear on the second and third speed engagement teeth because T-10 likes to slip and pop out of gear.

[Robert Jorjorian]

input (4th) is unique 63 and will not interchange *NM*

[Verne Frantz]

Bolt circle is also smaller on D case, not same *NM*

[Joe M.]

Re: BW T-10 Transmissions

Correction, the T10-C case is dated Dec 1963 not Dec 62.

Some of these queries that strike close to home cause me to run out to search in the garage attic for part numbers and dates despite the time of day or level of consciousness.