71 LT-1 - What's my axle ratio?
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71 LT-1 - What's my axle ratio? - 6/17/2005 4:18:10 PM
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pg0099
Posts: 6
Joined: 6/10/2005
Status: offline
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Hello,
I recently purchased a beautifully restored 71 LT-1 and I am not sure what the axle ratio is. It has the M20 tranny. The dealer told me that the ratio was 3:73, now I know there was a 3:70, 4:11, 3:55 but I do not know what Chevrolet offered with the M20.
I am not sure what numbers to check to figure this out what came on the car when new.
Cruising at 55mph, the tach reads 2000 rpm.
Also, the performance seems a little bland. I thought the LT-1 had more pep. I feel like my 1990 L98 was quicker 0-80.
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RE: 71 LT-1 - What's my axle ratio? - 6/29/2005 5:27:31 PM
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DaveWJunior
Posts: 56
Joined: 6/29/2005
Status: offline
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The easiest way to find out would be to just jack up the rear end and spin the tire once around. Count how many times the driveshaft spins. I usually just put a little chalk line on the shaft to make it easier to count.
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RE: 71 LT-1 - What's my axle ratio? - 7/26/2006 1:49:22 AM
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C3 Starship
Posts: 4814
Joined: 7/25/2006
Status: offline
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3.08 is common, but there are also 3.36, 4.10, and 4.33 besides what you mentioned. Mark the drive shaft and the rear diff housing with a piece of chalk, count the rotations of the drive shaft to one rotation of the rear tire. A little more than 3 rotations is about a 3.08, 3 and 1/3 rotations is a 3.36, 3 and 3/4 rotations is a 3.75, and a little more than 4 rotations is a 4.10, and so on.
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RE: 71 LT-1 - What's my axle ratio? - 8/2/2006 10:00:56 AM
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1969 L46
Posts: 128
Joined: 5/26/2006
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As Starship said the easiest way is to do the wheel turn driveshaft turn count. The only other way is to remove the differential. And if you are not rebuilding the rear and suspension, I wouldn't suggest that method. It takes quite awhile to remove the suspension components to get to the rear and then you have to remove the rear crossmember to remove the center section.
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There is a fine line between hobby and obsession and I think I crossed it!!
1969 Corvette L46 4 Speed Convertible
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You can see pics of the cars at www.cardomain.com/ride/719562 Just click my user ID
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RE: 71 LT-1 - What's my axle ratio? - 8/3/2006 8:48:49 PM
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mech259
Posts: 1760
Joined: 1/22/2006
From: Lumberton, Texas
Status: offline
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Some of the more common GM ratio's are 3.08, 3.73, 4.11, 4.56 
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1986 C4
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1970 Chevelle SS 396 (under construction)
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