Dana 44?
Team Owner
Joined: Aug 2000
Posts: 40,156
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From: San Pedro CA
what RPO codes do you have?
It could be 3.33 or 3.45... might be 3.54 or 3.07...
I am trying to remember the trick... jackup the rear... turn the tire, count the turns of the driveshaft... something like that.
It could be 3.33 or 3.45... might be 3.54 or 3.07...
I am trying to remember the trick... jackup the rear... turn the tire, count the turns of the driveshaft... something like that.
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Look in your RPO codes for GT7 or GHO
If its a 6speed, then its a D44 but there were a couple available ratios for 89.
If its a 6speed, then its a D44 but there were a couple available ratios for 89.
Drifting
Joined: Feb 2002
Posts: 1,952
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From: Little Rock Arkansas
Originally Posted by 89Corvette6spdFX3
How do I determine the gear ratio and rear end I have? Thanks.
The ratio is usually stamped into the bottom of the diff case as well while some early ones had an aluminum tag with the ratio on the drain plug. Another way to simply tell is to jack up the car, mark the driveshaft and a tire. Rotate the tire over one revolution and count how many times the driveshaft turns.
-Jeb
Le Mans Master
Joined: Jun 2006
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From: One day you're a Comet...the next day you're dust... Arkansas
I have an early 1989 Z51 6-speed RPO GHO. My original owners manual shows that code to be 3.54. Seems pretty definative. Apparently later in the year the GT7 was used at 3.33 making 1989 a transitional year for the D44 (no pun intended)!
Team Owner
Joined: Sep 2001
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Originally Posted by jburnett
Without exception the ONLY ratios I've EVER seen in 89's have been 3.45:1... 3.33's were only in 1990's as far as I can tell...And 3.54's are ZR1 gears. The early 44's in '85 and '86 occasionally had 3.07's but that ratio is much more common in Vipers.
-Jeb
-Jeb
84-88 all got 3.07
Drifting
Joined: Feb 2002
Posts: 1,952
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From: Little Rock Arkansas
Originally Posted by vader86
89 is a transitional year, GM couldnt quite figure it out so 3.54s were available in there to start, and 3.33s were there to end it and that carried into 90.
84-88 all got 3.07
84-88 all got 3.07
-Jeb
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Team Owner
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From: Athens AL
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Your 88 4+3 should not have had 3.45, it was not available from the factory.
You are right on 84, my mistake, but 3.07 was available for the manual.
You are right on 84, my mistake, but 3.07 was available for the manual.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by CentralCoaster
84 had a 3.31 d36 option as well, right?
RACE ON!!!
Le Mans Master
Joined: Jun 2006
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From: One day you're a Comet...the next day you're dust... Arkansas
3.45 and 3.54 are quicker, the early gears were 3.54, you get the highway gas milage nod! With the .50 6th gear not much difference though!
Last edited by BADDUCK; Jul 19, 2006 at 04:15 PM.
