Pros & Cons: 3.54 vs. 4.44 & Mitchell OD

[Will Kimble]

I have only put a few miles on my new AV8 but I am already concerned about the 4.44 gear ratio that came in the rearend - I don't think it is gonna work for even a short highway trip. I always figured I would switch to a 3.54 and keep things simple, but...

But the car is a hoot to drive around town with the 4.44 rearend. I am starting to think a 4.44 rear with a Mitchell overdrive would be really handy, almost like a four speed. Use 1-3 in town and pull it onto overdrive when you want to go 65.

So I am evaluating the options and looking for input on pros & cons. I don't want to go any faster than 65, but I would like to be able to run 65 from Cincinnati to Columbus, Dayton, Indianapolis or Louisville. My car is pretty light, but is a 221 with a stock cam & heads, dual 97s and headers. And a '39 transmission. I know what goes into a rear gear swap, but have never worked with a Mitchell before - although their product reputation is superb. My only concern would be getting the right size overdrive for my car, since it isn't a stock piece - a '37-40 rearend that has been shortened to fit a '32 chassis and has the short '46-48 rear radius rods.

I guess the big question is should I keep it simple (3.54) or would the extra planning and expense of the overdrive be worth it?

Here's a shot of the car for reference:



Thanks for your thoughts,
Will Kimble
www.kimblemandolins.com