Hi all I wanted your guy's advice I have a eaton r end w/390 gears
Would changing them to 332? would that help the gas mileage I get between 8 & 10 MPG with a 400 and a/c stick when I'm in 4th it feels like it could use a couple more shifts like a 5 or 6 speed Any thoughts on this.
Thank's Steve

 

Keep the 3.90 gears, get an O.D. trans. One less expensive option is the A833 OD four speed. This Chyrsler trans was used in Chevy pickups in the mid-80s so can be found with a GM bolt pattern and input shaft. A TKO is a better, if far more expensive solution.

 

Joe I Don't want to change the tranny because of the counsel
I rather chage the gears if it cheaper I'm thinking of getting a diff car this is to much for me w/ the clutch and stuff health issues but if I keep it I like to change the rear end gear if it help the gas mileage,what do you think Thanks Steve
I liked the 70-72 Cutlass w/350 rocket nice car

 

What rear end do you have I am sure if you really want a change some one would love the 390 gears
If you don't want to swap the trans gears would help but it won't feel the same

 

It a eaton 390 I was thinking of keeping them and sell them w/the car