Rear End Gears

[fordamodel]

New to the site but have a question? My car has a ford 302 stroked to a 327, built ford aod, 28 inch tall tires, 4.10 gears' cruising at 70 mph it turns 2300rpm, thinking of going to 4.30 gears, how much would this change my rpm at 70 mph? I still want to drive it on weekends while street light racing, also what about BTE 11 lock up converter anyone using one? I had a 10 inch non lock up but it heated bad on the street.

 

[Grn92LX]

Probably very little 100 rpm or so. I have 4.30's in my street car its not that high, usually under 2500 cruising.

 

[fordamodel]

That's what I wanted to here, summit racing has a calculator but it doesn't show it with overdrive, thanks!

 

[FastDriver]

4.30/4.10 = 1.049

So your rpm increases by 5% when you change to 4.30s

 

[fordamodel]

Thanks good info!

 

[revhead347]

Might be enough to get it out of the drone zone. You never know.

Kurt

 

[mikestang63]

AOD OD is .67 to 1 fyi

 

[fordamodel]

Thanks