3:73 gear
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New User
Joined: Jun 2005
Posts: 8
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From: Beverly Hills Florida
3:73 gear
Is there some one out there who can tell me if there is a way to identify a certain gear in a truck by pulling the gear housing cover and looking at the gear( maybe by counting number of gear teeth etc) I had a transmission mechanic remove my stock 3:31 gear from my 1995 F-150 and install a 3:73 gear. The problem is when I tow my boat I can't tell the difference. The boat doesn't tow any easier. I am wondering if he even changed the gears.
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Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
The difference between 3.31 and 3.73 is not much, so maybe you just didn't notice the difference because it's too small. A simpler way to determine rear gear ration is by counting the number of revolutions on the drive shaft and on the wheel -- for 41 revolutions on the drive shaft you should have 11 revolutuions on the wheel with 3.73.
Senior User
Joined: Nov 2004
Posts: 202
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Would there be much difference from 3.08 to 3.73.
I fing my 4.9l 300 with 3.08 doesn't tow well but Im not sure if it is the rear end or a failing E4OD.
Toxing seems sluggish. If I came to a hill I don't know if I could make it up.
I fing my 4.9l 300 with 3.08 doesn't tow well but Im not sure if it is the rear end or a failing E4OD.
Toxing seems sluggish. If I came to a hill I don't know if I could make it up.
Cargo Master
Joined: Aug 2004
Posts: 2,899
Likes: 2
From: Lynnwood, WA
The difference is 17.5% vs. 11% from 3.31, and that's definitely more. Replacing the whole axle (rear) could be cheaper and easier than regearing, as long as the ratio you need was a common factory option on a given axle. Note, if you have a 4x4, that means 2 axles, and there is no easy solution for the front axle.
