I have aclose ratio B-W trans in my 1979. I need a gasket kit. Do i have a T-10 or Super t-10. Whats the difference between them...

 

Not sure how it goes but we are supposed to have a Super T10 in our Vettes but some would argue the Super T10 was the cast iron one, not sure maybe someone who actually knows the story will chime in, in my opinion they ain't too super anyway

 

The T-10 4 speed and Super T10 have huge differences. The early T-10 has a 7/8" countershaft, roller thrust washer between 2nd and 3rd gear and most have a 16 spline output and 10 spline input. Some GM cars do have 23 as well as 27 spline outputs. The T-10 was no longer used in GM cars by mid 1963... in Vettes somewhere in June of '63.

The Super T-10 came in a 1st design and 2nd design version. The alloy case and iron case versions are both ST10. Alloy cases were only in GM cars. 1st design Iron cases in Fords, and AMC and over the counter.
GM never used the first design version in passenger cars except in a rare pickup truck version of the 3.42 ratio.

1st design had no bushing under 1st, a 7/8" countershaft, and iron main cases with iron or alloy tails. 10 spline input and 27 spline output.

2nd design had a bushed 1st, 1" countershaft, iron or alloy main cases and alloy tails. 26 spline inputs and 32 spline outputs. Alloy and Iron cases were both in GM cars, iron cases primarily in F Bodys and over the counter. Alloy cases specific only to GM

After the power levels dropped in 1974. The Super T-10 was issued in 1975. It really isn't as strong as a Muncie unless you go for an OTC 9310 Nickel Box with nodular iron case and midplate. There are 2.42, 2.64, 2.88 and 3.42 1st gear versions. There are also close ratio versions of the 2.64 and 2.88 gearsets.

You have a Super T10
Paul

www.5speeds.com

 

I apologize for sidetracking the post, but will the shifters interchange between the T-10 and SuperT10? Other than the clutch and driveshaft yolk, would a Super T10 be a direct bolt-in replacement for an early T10? TIA Wes

 

Here is a website that will ID your trans. Get all the numbers off of it and check.
http://fiedlerh.home.att.net/BW.htm
This site helped me ID mine as a '77 ST-10...which is sitting in my 72.
Hope this helps
Eddie

 

Toyvet, sorry for treading on your post. Thanks for the link Silvr77; there's a lot of godd information there.

My '59 has the original close ratio T-10, and I would like to replace it with a 2.88 geared Super T-10 I have. I'm trying to determine if I can re-use the existing shifter and crossmember & transmount before I buy a new clutch and driveshaft yolk. Does anyone know if the existing cross member and shifter will work when going from a T-10 to a Super T-10? Wes

 

The early T-10 shifter shafts have the rectangular slots clocked at 2:00 position when in neutral. The Super T10 has them at 12:00. So you would need ST10 shift arms. The bolt pattern for linkage mounting is different as well. This may be able to be modified on the bracket. It requires some work, but it can be done. You can always use a first design ST10 or have someone make a hybrid, with a 1st design ST10 mainshaft using the 2nd design ST10 case and gearset, but early T10 tail and side cover...

Paul
www.5speeds.com

 

5speeds, does the super T-10 use o rings or seal for the shifter shafts on the side cover. That where mine is leaking.

 

The GM ST10 with the alloy case uses side seals.

Chicago Rawhide Part #'s

Side Seals in cover - #6130
Front seal #12363
Rear seal #18658
... The reverse takes an O-ring. GM # 6260717 --- I Think??

Paul
www.5speeds.com

 

Paul, thanks for the explanation. I wish I would have known about the hybrid trans before I rebuilt the T-10 last year. Thanks again, Wes