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Old 02-07-2009, 06:42 PM
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T10 power brute help

I just bought a super T10 and I am having a hardtime identifying exactly what it is. I was told it was a 2.43 ratio out of a 1970's corvette. It is an iron case with an aluminium tail housing. There is one groove on the coarse input shaft and it has the th350 output splines. The date code on the driver side rear of the case is WH1712. On the passenger side there is a raised box with G.14.71 cast into it. Below that is T10-1B W.G. DIV. 0-2 in larger cast font. There is no partial VIN on the casw anywhere. On the tail housing it says T10-7D 3813490 4-18-63. Any help would be greatly appreciated. I just did a little research can anybody confirm this?

"Dave, What you have is a 1st design Super T-10 which was only available as an over-the-counter complete transmission designed as a direct replacement for the early Corvette T-10. They were made from 1968 through early 1972 and did have 10-spline input and 27-spline outputs like the early T-10 and early Muncies. There were several gearsets available for them including 2.23:1, 2.43:1, 2.64:1 and 3.44:1 first gear ratios. Some even had 9310 nickel inputs (with 0.060" wider gear) and clusters installed (Also had a 0.060" wider front gear to mate with the wider input) which had much higher torque capacity. Later 2nd design ST-10's all had 26-spline input and 32-spline outputs like the 71-74 Muncies.

All in all, a good transmission. The only weak point is they have a tendency to seize first gear to the mainshaft. There is no sleeve on the mainshaft for 1st gear like Muncies and ST-10's."

I'm leaning towards my tranny being one of these. By the rings on the input shaft it should be the 2.64 ratio. Is the torque any higher on the gearboxes? Any info would be great.


Last edited by FFNPB; 02-08-2009 at 07:36 PM.
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Old 02-12-2009, 08:03 AM
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count turns

shift it into first gear mark the input and out put and see how many turns the input has to turn to get the output to turn one time. You can check the other gear ratios the same way.
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Old 02-12-2009, 04:03 PM
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Torque rating isn't any different than other ST-10 because that is decided by case centerline distance (distance between main shaft and cluster shaft), gear width, and tooth angle. Main problem with aluminum cases is too much power stretches the case--main input gear and the front cluster gear push away from each other and then strip teeth. The Iron case prevents most of this, so even though they may be rated the same, I'd rather have the Iron case. Your info seems correct to me on the rest. Only step more desirable would be to have the 26-spline input and 32-spline output and the sleeved 1st gear.
I'd sell it to the highest bidder after you talk up it's good points, and go buy a Tremec 5-speed.... 4-speeds are the Dark Ages. But that's just me
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Old 02-12-2009, 04:47 PM
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Thanks for the info.
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