Join Date: Nov 2008
Location: Beautiful Chester County, PA
Originally Posted by BigBlackBeaSSt
Yes it will work. You will have to re-calibrate your spedo, but I believe the TBI cars did this via a new gear in the tranny. No re-program necessary. 3.73:1 ratio should not cause you any troubles with vibration unless something is not correct to begin with. The disk will work fine. If you do the brake bolt mod it would make the discs more effective.
If you have the tow pack what rear do you have now? Some of the Roady Sedans (assuming we are talking about a sedan) tow pack cars came with 3.73:1 gears.
Correct but it well documented that the stock driveshaft will cause vibration that the 3.08s don't really show until it spins faster with the 3.73's. The 3.73 will show a problem with the DS that the 3.08 never had.
I never really noticed a problem with vibration when cruising up to 80-90 MPH until I swapped in another rear with 3.73 gear. With 3.73 I would get a small but noticeable vibration at about 65-70 MPH. Switched over to a balanced Dynotech DS and the problem was instantly fixed.
BTW - check for posts by member Goldmaster. He has done this swap in a RM before and may have some info that would be helpful.
'95 Caprice SS conversion - Bonny Buckets - 96 Column, Shifter and Console - 3.73 Gear and Herter tune - Z/28 Cluster - Blazer OH Console - Green/Pink bushings - Chromed Impala Wheels - Eibach Springs and Bilstein Shocks - Corvette Engine Dress - the list goes on and still more to do...it never ends.
Last edited by 4DoorSS; 11-16-2014 at 02:25 PM.