Transmission numbers don't add up

[David H.]

Jerry and I have been attempting to ID my 4 speed transmission that is in my '62 Vette.
Something doesn't seem quite right with the numbers if it is the original transmission, which I thought it was.
Jerry came up with this:
David Bates
Feb 6th, 04, 1:41 PM
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.

Anyone care to add their 2cents?
Thanks

[Mike E.]

Re: Transmission numbers don't add up

David,
If the VIN isn't stamped in the same area as the W date stamping, it isn't the original transmission for sure.

[Mike M.]

Re: Transmission numbers don't add up

doesn't look like a super t-10. looks like a t-10 to me.mike

[Joe L.]

Re: Transmission numbers don't add up

Jerry and I have been attempting to ID my 4 speed transmission that is in my '62 Vette.
Something doesn't seem quite right with the numbers if it is the original transmission, which I thought it was.
Jerry came up with this:
David Bates
Feb 6th, 04, 1:41 PM
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.

Anyone care to add their 2cents?
Thanks

David-----


The transmission pictured is not a Super T-10. It is a 1960-E61 T-10. The date on the extension housing also seems to confirm that. However, I don't think it is or could be original to your 1962.

[Stewart A.]

Re: Transmission numbers don't add up

1960 T 10 1B That's a 1960 gear box. But the WD 80 - 2 would mean. D - April 8th day 1960. 2nd shift. But the stamp is in the wrong place. The stamp should be running down the left side of the cover plate. HHHmmm I would say it might be a re stamp in the wrong possi ? Stewy

[Richard T.]

Re: Transmission numbers don't add up

The 1962 T-10 should have the T-10D tail housing with the single mounting boss. Definitly NOT your original trans. Rich

[William C.]

Re: Transmission numbers don't add up

To say nothing of an aluminum maincase.

[David H.]

Re: Transmission numbers don't add up

Welllllll, don't that just suck out loud?!

Ok, can you tell me what the small screwed on plate with 2-17 means on the transmission?
And the M 2 10 60 on the tailstock?

I found some cracks in the tranny case also. Some of it has been fixed before as there is a reddish sealer on some of the damage already. (pics)

Your opinions.........
Should I look for a correct transmission to put back into it?

Thanks very much for all your input.

dlh

[Joe L.]

Re: Transmission numbers don't add up

Welllllll, don't that just suck out loud?!

Ok, can you tell me what the small screwed on plate with 2-17 means on the transmission?
And the M 2 10 60 on the tailstock?

I found some cracks in the tranny case also. Some of it has been fixed before as there is a reddish sealer on some of the damage already. (pics)

Your opinions.........
Should I look for a correct transmission to put back into it?

Thanks very much for all your input.

dlh

David-----


The "2-17" on the main case likely represents a date. However, it's probably a month and day with no reference to year. I would say that the"2 10 60" on the extension housing definitely represents a month, day, and year. It also fits pretty well with the date on the main case, assuming the "2 17" represents 2/17/60. The 1960 date also fits with the transmission main case and extension housing "B" suffix codes. So, date-wise, everything seems to "line up".

Very often, there will be what appear to be cracks on aluminum die and sand castings but which are not really cracks. That's not the case here, though. I think these are really cracks. The one on the upper portion of the extension housing is definitely a crack. The one near the shifter lever boss looks to be a crack, too. This area is often cracked by "bozos" trying to drive the pin through from the wrong direction. That's likely what happened here. At some point, someone has used what appears to be silicone sealer to help control leaks or, maybe, just routinely in rebuilding the transmission.

None of the cracks may cause a problem, but I'd be VERY uncomfortable with them. They could likely be weld-repaired. However, these parts are not original to the car, anyway, so looking for better and more correct parts might be the way to go.

[Mark P.]

Re: Transmission numbers don't add up

If it is a 60 T-10 then you should be able to sell it and get a 62 T-10. When I was looking for my 60 T-10 they were real hard to find but there lots of 61-61 Aluminum Corvette T-10's.

You might even find a larger rebuilder to swap it for you.

[Richard T.]

Re: Transmission numbers don't add up

I would replace it now while it's out. Once you put it back it may be forgotten. The cracks may not cause a failure but I know they would haunt me to death. How does the trans operate? If it shifts fine and stays in all gears you might consider shopping for a good main case, tail housing, and side cover, all with the correct dates that you need. Then just transfer the internals from your trans.
There are a few 62 T-10 on flea bay right now but they can be pricey and your not sure what your getting. Good luck Rich

[Barry H.]

Re: Transmission numbers don't add up

David, Mr Clupper is correct about the main case, the 60 T10 had a cast iron main case. They went to all aluminun sometime in 61. Might be a "MUFP" transmission, (made up from parts). Saw 2 real 62 all alum transmissions at Corv Carlisle last year for $550. to $700. 1 C/R Corv, & 1 W/R Chev trans. Good luck Barry Holmes

[Joe L.]

Re: Transmission numbers don't add up

David, Mr Clupper is correct about the main case, the 60 T10 had a cast iron main case. They went to all aluminun sometime in 61. Might be a "MUFP" transmission, (made up from parts). Saw 2 real 62 all alum transmissions at Corv Carlisle last year for $550. to $700. 1 C/R Corv, & 1 W/R Chev trans. Good luck Barry Holmes

Barry-----


I'm not so sure this case is aluminum. If it is, then it's the first T-10-1B I'm aware of that was cast from aluminum. However, I suppose it's possible that some were made, perhaps for non-GM applications or, maybe, even for some GM applications. I've never really studied T-10's all that closely.

It would be nice if David could check this for us. A magnet ought to tell the tale pretty quickly.

[Barry H.]

Re: Transmission numbers don't add up

Joe, Upon closer examination, it does appear to be Cast Iron. With the shine from the cleaning it looked to be alum Sorry. Barry Holmes

[David H.]

Re: Transmission numbers don't add up

The case to the transmission is cast iron and the tailstock is aluminum.