We're always talking about how the 928's gearing is not suited for drag type raceing, and can't realy be made as such.

OK, I said to myself, lets check into it.

A 2002 mustang, with the 4.6 engine, with similer hp, and torque to the 4.7l Porsche come stock with a 2.4 final drive ratio, I belive. First gear is a 3.38. Result? The over all gearing for 1st gear is a 8.11 to 1.

My 83's first gear ratio is 4.2706:1 and the final drive is 2.26:1. Overall gearing ratio for first gear, 9.6795. Intersting.

One of the common modes for a Mustang is replaceing the final drive with a 3.73 unit. The overall gearing ratio is about 12.5. Useing my car's 1st gear, and the final drive off a 78-82, I get an over all ratio of 11.6 Hum, rather similer, no? Ought to give the car a bit more stop light go, uh?

If anyone knows, is it possible to drop an 78-82 final drive into a 83 car? I know you have to use shims to get the final drive aligned properly, but you have to do that anytime you replace the final drive unit.

Thanks.

 

VU- there is a thread about changing gearing... you were around then, maybe four months ago(?). Do some searching. He said thte car topped out at maybe 135, but went like hell.