Ford E4 trans question....

Discussion in 'Trucks and Trailers' started by o-so-n-so, Mar 27, 2005.

  1. o-so-n-so

    o-so-n-so LawnSite Bronze Member
    from Alabama
    Messages: 1,218

    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.
  2. Residential Recreation

    Residential Recreation LawnSite Member
    Messages: 74

    what were they before. its not the trans that you should be worried about its the ratio in your diff
  3. BCSteel

    BCSteel LawnSite Senior Member
    Messages: 876

    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.
  4. The Dude

    The Dude LawnSite Member
    Messages: 221

  5. o-so-n-so

    o-so-n-so LawnSite Bronze Member
    from Alabama
    Messages: 1,218

    Thanks for the what I needed...............................thanks
  6. Albemarle Lawn

    Albemarle Lawn LawnSite Bronze Member
    Messages: 1,544

    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.


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