The Ford Barn - View Single Post - What gears in a stock '48 F1 with 9" rearend?

Brennan805 · 03-25-2024, 10:39 AM

Hello guys. I've searched the forums and had little results finding the gearing that is best suited for my F1. Here's the details...It's a stock '48 with the original 100 hp flatty, 3-speed tranny and dana 41 rearend. Since I can't get gears for the Dana 41, I decided to do a 9" swap (yes, I read the article). I found a nice '64 F-100 rearend that should do a nice, clean bolt up.

My question is; What do you guys suggest for gearing in the 9"?

I intend to keep the original flathead and gearbox. I'm looking for a bit more highway speed at lower RPM's. Basically, a more comfortable ride. Not a lot of hills or grades to worry about, mostly flatland driving. I was thinking 3.50 gears. What do you guys think?

Also, any recommendations or suggestions on the pinion angle? I heard 12 degrees using a 5 degree castor wedge?

Thanks for you time and help.

03-25-2024, 10:39 AM	#1
Brennan805 Junior Member Join Date: Aug 2018 Posts: 4	What gears in a stock '48 F1 with 9" rearend? Hello guys. I've searched the forums and had little results finding the gearing that is best suited for my F1. Here's the details...It's a stock '48 with the original 100 hp flatty, 3-speed tranny and dana 41 rearend. Since I can't get gears for the Dana 41, I decided to do a 9" swap (yes, I read the article). I found a nice '64 F-100 rearend that should do a nice, clean bolt up. My question is; What do you guys suggest for gearing in the 9"? I intend to keep the original flathead and gearbox. I'm looking for a bit more highway speed at lower RPM's. Basically, a more comfortable ride. Not a lot of hills or grades to worry about, mostly flatland driving. I was thinking 3.50 gears. What do you guys think? Also, any recommendations or suggestions on the pinion angle? I heard 12 degrees using a 5 degree castor wedge? Thanks for you time and help.