View Full Version : Ford E4 trans question....

03-28-2005, 12:01 AM
I just had the transmission rebuilt in my 95 F350. Its a E4 behind a 7.3 powerstroke. My question is this. What is the correct RPM's for that transmission in OD lets say at 55 mph?

I think that its running to many rpm for od. It will shift through all the gears so I know its shifting out right. It just seems that the OD should reduce my rpms more.

Its 2500 at 55 now.

Residential Recreation
03-28-2005, 12:24 AM
what were they before. its not the trans that you should be worried about its the ratio in your diff

03-28-2005, 01:54 PM
I have a '94 7.3 idi w/turbo and and after market e4od and 4.10 diff. At 100km/hr (60 mph) its right at 2k. Sounds like you have a real low geared diff or maybe the torque converter isnt locking up.

The Dude
03-28-2005, 02:01 PM
I cannot reccommend http://www.fordtrucks.com enough. Lots of Ford truck information on the forums there.

03-31-2005, 09:25 PM
Thanks for the info..got what I needed...............................thanks

Albemarle Lawn
04-01-2005, 01:41 AM
Has calculators for RPM. You input your tire size, transmission (OD, in your case), and gear ratio. It calculates RPM @ MPH for you.

That will give you a baseline. If you are more, your tachometer is off (this is common) or your T/C is not locking up.


If you do not know your tire height in inches, there is a calculator for that too, just put in 245 70 16, etc or whatever your tire is to calculate height in inches.