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Old Jul 28, 2010 | 11:36 AM
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Is it safe to assume that a early 71 LT-1 four speed would have a M-22 trans ?
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Old Jul 28, 2010 | 01:38 PM
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Originally Posted by Burnt71
Is it safe to assume that a early 71 LT-1 four speed would have a M-22 trans ?
According to my black book in 1971, 130 M22 close ratio H/D 4 speed manual transmissions were available for corvettes.8 ZR1's and 12 ZR2's had to have them so that leaves 110 M22's available for the rest of the corvette production run of 21,801 cars. M21 was the standard transmission for the LT-1 option, but I assume you could have ordered a M22 as a optional transmission choice.
Hope this helps
Regards
Roy
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Old Jul 28, 2010 | 01:38 PM
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No.

In 71 there were 1949 LT1's, and only 130 M22's.

And I'm guessing that most of those M22's most likely went with the 188 LS6's that were sold in 71.
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Old Jul 28, 2010 | 03:43 PM
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Originally Posted by Burnt71
Is it safe to assume that a early 71 LT-1 four speed would have a M-22 trans ?
No. Not safe. Safer to assume the LT-1 package required the M-21.

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Old Jul 28, 2010 | 05:44 PM
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Originally Posted by Easy Mike
No. Not safe. Safer to assume the LT-1 package required the M-21.

1971 LT-1 came with M20 as standard and 3:55 rear

You had to order M21 or 22 on a LT-1 or the dealer may have ordered it.
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Old Jul 28, 2010 | 05:59 PM
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If that 71 LT-1 has a factory installed 4.56 differential, it is safe to assume it is a ZR-1 option car with an M-22 otherwise, all bets are off
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Old Jul 28, 2010 | 06:16 PM
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Just crawl up under the car and read the number stamped on the case.
Chuck
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Old Jul 28, 2010 | 06:23 PM
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Originally Posted by chuckievette
Just crawl up under the car and read the number stamped on the case.
Chuck
Better than that , just drive the car if posssible. If it is a M22 you will hear it.

The car could also have a M22 , but it may not be original to car.

Would need to check VIN as well to confirm that.

I would say a LT-1 with an original M22 is not normal at all.

David
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Old Jul 29, 2010 | 01:43 PM
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No. If you get a chance to see an original Corvette Order Form, the M22 heavy duty transmission was only available to the LS6 option. Only the 8 ordered LT-1 ZR-1 Corvettes received the M22 trans as part of that option package. The other 122 went into LS6's with and without the ZR-2 package.
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Old Jul 29, 2010 | 05:07 PM
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Originally Posted by early shark
No. If you get a chance to see an original Corvette Order Form, the M22 heavy duty transmission was only available to the LS6 option. Only the 8 ordered LT-1 ZR-1 Corvettes received the M22 trans as part of that option package. The other 122 went into LS6's with and without the ZR-2 package.
early shark , it is my understanding that there were 12 1971 ZR2's , and 188 LS6's

So we know the 8 or 12 ZR2's had M22 , but would you agree that some LS6's must have came with out M22's? since only 122 M22 cars?

As I recall , I have seen the back of a 1971 sales brochure and you could get a automatic trans in a LS6

Thanks for you input

David
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