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Hello everyone I have a 1979 f100 2wd with the factory rear end. It has the Factory 302 with a Factory 3 speed with Overdrive in the floor. It came with a 2.75 rear end which is a little high geared for the mountains of NC. Im wanting to run a 3.73 What all do I need for the change. PS sorry im new at this kind of stuff.
Being an F100 it should likely have a D44 rearend. Not sure if 9" were occasionally put in at the factory or if they were always aftermarket swaps but it sometimes happens. If you had a 9" rearend you could likely very easily find a 3:50 gear ratio 3rd member a junkyard to swap in and quite cheaply.
Post up a photo of it and we can eyeball it for ya!
And I agree that 2.75 to 3.73 is a huge jump! 3.00 or 3.21 might be better? I suppose that it depends on your primary purpose is and what rpms your looking for at the speeds you want to drive it at.
Here's the RPM calculator I normally use... it works pretty well. I always use the bottom part for manual trannies where you can put in all your info. Engine RPM Calculator
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