833 Swap

[DusterDaddy]

I have a 74 Duster factory 318/904/8.25
The motor was seized when I bought it and the trans housing had a nasty split in the side.

So for the most part I am left with a rusty roller.

since I am going to strip the car to the unibody and and rebuild it I want a 4 speed trans. I bought a nice 318 with a mild cam and nice head re-work and and a performer intake and a small Holley that's going back in the car when the time comes.

My question is, what rear end gearing was typical for a 74 Duster with a 318 and a 904?

Also, should I look for an overdrive 833 or not?

Thanks in advance for any advice!

 

[Rocky_JS]

Rear gear is likely 3.23

BrianT had a complete? conversion for sale on here. It was a 4-spd non OD. Send him a PM

 

[DusterDaddy]

Thanks Rocky. So, not having any knowledge on this subject, if I was to find a non overdrive 833 from early to mid 70's and installed it in my car with a stock 3.23 rear, about how man RPM will the motor be turning at 65 MPH with stock 14" wheels and tires?
And how is first gear going to feel?

 

[Rocky_JS]

tire height will make a difference, but with a 26" tall tire I'd guess around 27 to 2,800 rpm +/-. The final drive ratio is still 1:1. If you have an auto in it now it should be about the same in 4th gear.