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A friend on Moparts said he had to change out the input shaft and pump so he could run a 727 converter.

I don't like how the Wallace calculator doesn't show the values you typed in, the Randy's calculator is a little more user friendly but it's not a big deal. https://www.ringpinion.com/Calculators/Calc_RPM.aspx

LOL, that's the primitive caveman approach. Nothing wrong with asking advice from people who have already been there, and the RPM calculators are great, I use the one on Randy's ring and pinion page and it's always accurate. When I raced for 21 years I would just throw 4.56 gears and an 8"...

I'm running a 275/60/15, that's as tall as I can go. Sounds like a nice combo in your Cuda.

GER was the worst converter company on the face of the earth. I've always used this RPM calculator, it's very simple and accurate. https://www.ringpinion.com/Calculators/Calc_RPM.aspx Original poster, what motor are you running? I've read alot of threads about highway gearing and...

I've been doing alot of homework on overdrives and the A833 OD 4 speed seems like the simplest way to go if you're car is already setup for a manual, I wish mine was. The best option for a street/strip drag car is a Gearvendors overdrive although very expensive. Then, all the various overdrive...

John Cope at CRT should be able to help you get it sorted out. It's very frustrating when stuff doesn't fit. http://www.crtteno.com/crttranstech.htm

Ok thanks guys, great info! 1970Duster, there is nothing wrong with re-drilling to a 4.5 pattern for a street only car. I even ran 11's in a 340 Scamp for a few years with stock re-drilled axles. I've raced 9 second cars for years with all the good parts, the Duster I have now is just for...

Thanks, that's a great suggestion on the studs. What does re-drilling normally cost?

I have a 72 Duster with a stock 8.75 rearend and stock axles with the small 4" bolt pattern. Who is near Akron Ohio 44305 that can re-drill my axles to the 4.5 pattern? Would they need to weld-up any holes in the axles before re-drilling them? What does this normally cost to drill the axles...