What rear end with better rmp's & less torque will fit my 1951 F1. I don't have garage and only a few air tools and would like to find a rear end that doesn't take much fabrication.

Thanks in advance!

 

https://www.ford-trucks.com/article/...ial_Swaps.html

A good place to start is to read this article. Then ask away, I believe you will find the 9" Ford the one you will like.

 

I have the optional 4:27 gears in ny 51 F1 with the non-syncro 4 speed. I'm saving to buy a rearend between 57 and 72 f100 with the 3:50 gears. It is supposed to be a direct bolt in to replace that Dana 44. They say the only thing that may need to be changed is the length of the driveshaft.

Rod

 

I'm now looking for a 57-72 F100 9" rear end. From the thread I read it will bolt in prefectly and will keep the truck bolt pattern I want to keep. My (hopefully last) question on this matter is: Will the drums as they are work or will I need to fabricate different ones to keep my rear tires tracking with the original front end?

Thanks for your help in advance!

 

That's the beauty of that swap. They're all the same width. And as a bonus, I bolted my '48 backing plates (with all new components) on a 9" axle out of a 65 pickup. Rear drums are the same thru '67.

For ease - stay away from '73-up. Ford widened the track by a couple of inches in '73.

 

Note the 9" has 3" axle tubes and the Dana has 2.5" so you need new u-bolt plates.

 

Any of you guys that have done this swap, did you have to do any modifications too the drive shaft.



Rod

 

Rod, yes. The 9" is approx 1 1/4" shorter measured from the axle centerline than the Dana/Spicer stock rear end. I went to a local machine shop that specializes in drivelines. Bought a longer (1" or 1 1/2") splined yoke for the front of the driveshaft. They had it sitting on the shelf already made up. Doesn't get any easier - think it cost me 40 or 50 bucks, but came complete with seal and grease fittings.