Looking for advice on gearing

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Looking for advice on gearing Empty Looking for advice on gearing

Post  kevin316 on January 14th 2013, 10:55 pm

I have a '79 shortbox F100 2 wheel drive with a 650 hp (+/-) 521 stroker and a c6 behind it. Auburn limited slip with 31 spline axles. It will have a 28" - 31" tire and will run street 90% of the time. I don't want to drive it across the country but it would be nice to be able to take it on a 3 hr tour for a run on the strip.

Looking for some input on gearing but also on converter stall. I'm guessing it will weigh in at about 4000 lbs.

How would something like a 3.50 gear work? Can I go lower and still have a good jump from a dead stop? I had someone suggest a 2.86 but that seems way to low.

Thanks in advance
Kevin

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Post  cool40 on January 14th 2013, 11:27 pm

3.50 or 3.70 would work good IMO. the gear you use will have a lot to do with the converter you need but also the weight of the truck.
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Post  quick 52 on January 15th 2013, 12:05 pm

3.89 with 31

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Post  IDT-572 on January 16th 2013, 2:56 pm

Getting your converter to lock up at torque peak is as important or more important than the gear selection as long as you get the gear in the ball park.
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Post  kevin316 on January 16th 2013, 10:32 pm

I decided to go with a 3.73. I'll see how that goes.

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Post  whitefield on January 18th 2013, 12:40 pm

kevin316 wrote:I decided to go with a 3.73. I'll see how that goes.


I think a 2500 stall converter to 3000 with a 3.50 to 3.25 gear would fit well with what you have.

I ran 3.25 3.50 and a 3.70 gear years a go with a big block and the 3.25 worked best for me and on a 72 with a small block the 3.50 worked the best . Just My Two cents!

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