Gearing ration in 1980 L48
Thread Starter
Racer
Joined: May 2006
Posts: 379
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From: greenville al
Gearing ration in 1980 L48
Anyone know what the stock gears are in an 80 L48. It has a Dana 44 rearend and I have changed the motor and transmission,...now its time for the rearend stuff. I have a 383 at 450 hp with a bowtie overdrive 770R4 stage 3. Also, a 100 shot of nitrous, and need more take off from the line, but still want some highway speed too.
Race Director
Joined: Jan 2003
Posts: 15,176
Likes: 88
From: State of Confusion
..... why-guess?
The car is 25+ years-old, and the gears may've been changed before you got it:
best to jack it up, rotate the drive-shaft, count axle-revolutions, and know FOR-SURE!
The car is 25+ years-old, and the gears may've been changed before you got it:
best to jack it up, rotate the drive-shaft, count axle-revolutions, and know FOR-SURE!
Drifting
Joined: Sep 2006
Posts: 1,259
Likes: 2
From: MS
All 1980 Vettes had 3.07s whether Auto or 4-speed.
The difference in a 3.07 and a 3.08 just comes from the ratio of the ring gear to the pinion gear.
This is a chart I made to show the number of teeth on the ring and pinion gears and how this determines the ratio.
63-79 GM
2.73...........41/15
3.08...........37/12
3.36...........37/11
3.55...........39/11
3.70...........37/10
4.11...........37/9
4.56...........41/9
3.73...........41/11 Richmond aftermarket
80-82 Dana 44
2.72...........?????
2.87...........43/15
3.07...........43/14
Don't know the tooth count on the 2.72 gearset, if anybody knows would appreciate posting it, thanks.
The difference in a 3.07 and a 3.08 just comes from the ratio of the ring gear to the pinion gear.
This is a chart I made to show the number of teeth on the ring and pinion gears and how this determines the ratio.
63-79 GM
2.73...........41/15
3.08...........37/12
3.36...........37/11
3.55...........39/11
3.70...........37/10
4.11...........37/9
4.56...........41/9
3.73...........41/11 Richmond aftermarket
80-82 Dana 44
2.72...........?????
2.87...........43/15
3.07...........43/14
Don't know the tooth count on the 2.72 gearset, if anybody knows would appreciate posting it, thanks.
Race Director
Joined: Jan 2003
Posts: 15,176
Likes: 88
From: State of Confusion
Originally Posted by wfo76
80-82 Dana 44
2.72...........?????
2.87...........43/15
3.07...........43/14
Don't know the tooth count on the 2.72 gearset, if anybody knows would appreciate posting it, thanks.
