Quick question about my gears...
Senior User
Joined: Apr 2008
Posts: 326
Likes: 0
From: eaton ohio
With the E4OD and 4.10 gears, you are still geared higher than I am with 3.55's and a 4 speed.
Right now you should top out at 104 MPH at 3300 RPM.
With 3.55's that would increase to 121 MPH at 3300 RPM.
1800 RPM should be about 66 MPH with 3.55's.
2080 RPM should be 66 MPH with 4.10 gears.
Where you may run into an issue with 3.55 gears is if you have to drive 55 MPH.
1500 RPM at 55 may mean running with overdrive locked out.
That could possibly cost you MPG instead of increasing it.
Right now you should top out at 104 MPH at 3300 RPM.
With 3.55's that would increase to 121 MPH at 3300 RPM.
1800 RPM should be about 66 MPH with 3.55's.
2080 RPM should be 66 MPH with 4.10 gears.
Where you may run into an issue with 3.55 gears is if you have to drive 55 MPH.
1500 RPM at 55 may mean running with overdrive locked out.
That could possibly cost you MPG instead of increasing it.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Its true. Thats why I like my 3.08s. For 55 MPH, the RPMs are still good in 3rd. For higher speeds I can use the overdrive, but or towing I lock it out and have a better final drive ratio than 4.10s in overdrive. If I had 3.55s I would probably find myself stuck between gears at 70 MPH, with overdrive being too tall for some conditions, and 3rd reving the engine too high for good economy.
