Diff ratios
Thread Starter
Instructor
Joined: Jan 2012
Posts: 216
Likes: 16
From: Tanunda South Australia
Diff ratios
I have a 79 Auto Corvette , how can I find what diff ratio it has ? On the highway at around 65mph the motor is running over 3,000 -3,500 rpm
Are the diff ratio numbers stamped on the diff housing ?
Are the diff ratio numbers stamped on the diff housing ?
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
NO way to tell without counting, I assume your have positraction, so both rear wheels are 'locked' to to put in neutral, SAFELY jack the rear tires off the ground, and chaulk the tires and the driveshaft....
spin the driveshaft and carefully count the rotations and final position while the tires turn just ONE complete rotation.....
so lets assume the tires do one rotation, and the drive shaft does 3.3 or so rotations, that means the gearset is 3.36.......
or say 4.1 rotations.....obviously a 4.11 rear.....
no rocket science....
spin the driveshaft and carefully count the rotations and final position while the tires turn just ONE complete rotation.....
so lets assume the tires do one rotation, and the drive shaft does 3.3 or so rotations, that means the gearset is 3.36.......
or say 4.1 rotations.....obviously a 4.11 rear.....
no rocket science....
