gear set

[calvin amerson]

hello to all I have a question for all experienced ford barners. I recently acquired what is listed as 4;11 gear set. is there any way that I can insure that this is the case I need help on this as I was planning to change out the gears to obtain a bit more speed, also installing ford f150 ****** thanks to all

 

[calvin amerson]

I forgot to mention the gears are not installed in anything right now

 

[Phil]

To check count teeth on each gear, divide pinion into ring gear gives ratio to 1. 4:11 to 1 however will be a LOW ratio for power not speed. 3:54 or 3:27 are the high speed gears. Phil

 

[1931 flamingo]

How many teeth on the pinion and ring gear??
Paul in CT

 

[afuncar]

Count the teeth on both gears and divide the pinion count into the crown count should tell you the ratio.

 

[Marco Tahtaras]

There would be 37 teeth on the ring gear. There aren't many cases where gearing that low is very useful.

 

[Tom Wesenberg]

What's the overdrive ratio of the ****** going into the car?
Most people keep the stock 3.78 rear end when installing the F-150 overdrive.

 

[just plain bill]

What's the overdrive ratio of the ****** going into the car?
Most people keep the stock 3.78 rear end when installing the F-150 overdrive.

Most are 73 % in 4 th or overdrive. 4.11 X .73 = 3.003

 

[Marco Tahtaras]

Most are 73 % in 4 th or overdrive. 4.11 X .73 = 3.003

I'm guessing that would be 1.27:1 in overdrive and I believe would be calculated as 4.11 / 1.27= 3.24:1 (rounded). I'm sure someone will correct me if I'm wrong. That would make 3.78 gears 2.98:1.

Here is an excerpt from an earlier post:

I am running a F150 with a 28% OD and a standard 3.78 rear end. She cruises comfortably at 65mph and has plenty of east Texas hill climbing ability. High compression 5.5 head. Oversize 1.73 intake. Ported. Zenith carb. B cam. Balanced and counterbalanced. At 65 the engine turns a comfortable 2250rpm.