That is a good tip Bob. Will do if I go the change route.
The previous owner/father of my car supposedly chose the 4.11 rear to keep the car in the prime torque spot for his driving style, which one could assume was going 0 to FAST as quick as possible (thus the choice of the drag racing 4.11 rear ratio). And as such it does make alot of sense on the hilly, curvey and low speed back country roads in CT where speeds in excess of 60 MPH on tree lined, stone wall lined, blind curved roads are an invite to disaster, ahem.. He supplied the rear, trannie and motor, this was not ERA's doing or council.
With the 4.11 gears, the car is a true slingshot and torque monster, I must admit. The revs immediatly get you into prime HP and torque areas of the particular engine. The dyno figures on my car are primo in the 2900 - 5300 RPM zone. A fairly flat torque curve (or should I say torque flat line) at 450 Lb-Ft +/- 15 in that range with HP starting at 241 at 2900 and then maxing at 426 at 5400 and then tapering down from there. So the 4.11 gears get you in the engines sweet spot nicely and keep you there.
The detriment is a busy 3500 RPM+ on turnpike speeds in 4th and slow overall highway top end.
In all the spares he gave me with the car, there are no other differential gear sets. Other items I have duplicates and even triplicates of.
