Speedometer Gearing Help!

Reply Subscribe

Thread Tools

Search this Thread

Nov 28, 2011 | 04:50 PM

THCARGUY

Thread Starter

Junior Member

Joined: Mar 2003

Posts: 56

Likes: 0

Car: 1985 & 1991 Trans Ams

Engine: 350 in both

Transmission: Auto in both

Axle/Gears: 3:23 Limited Slip in both

Speedometer Gearing Help!

My 1985 Trans Am has the original 700R4 Automatic Transmission but I have recently lowered the rearend gearing from the original 3:23s to 3:45s. What speedometer gear do I have from the factory and what new gear will I need to replace it with so my speedometer will not read approximately 3-4 mph too high? Thanx!
Tim.