Transmission suggestions

[Ron Jefferson]

I'm finally getting my own garage so I can start a proper rebuild on the car. My question is, I want to swap to a manual transmission. I'm shooting for modest power, 325-350 horsepower. What I want to know is what gear ratios I should use for the best fuel economy. I love the car but it is very rough on gas and my commute is about to go from 7 miles a day to 80. Promotions are a bitch lol. Thanks all.

 

[Nick M]

3.73 found in the 89-92 turbo model, and the A340E will give you the best mpg. The R154 is shorter in OD, and the W58 even shorter yet.

 

[Ron Jefferson]

I didn't think the auto would give you the best mileage. So I should just change out the gears in it?

 

[Nick M]

I thought you wanted the manual. I was just giving you info about MPG since you also commented on it. When the torque converter locks, the load will be the same as the manual trans. When unlocked, the load is lower from slippage (normal driving) and as such less fuel is commanded.