1995 E40D
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3rd Gear
Joined: Jan 2023
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1995 E40D
I have a 1995 F250 (2wd) with the 5.8L / E40D drive train that suddenly developed a rough shifting issue. By sudden I mean all was well, but when I took off from the next stop light, upshifts and downshifts rattled my teeth. I figured a good place to start (simple solution first) was to drop the pan, clean & inspect, and fill with fresh fluid. I don't know if/when the fluid was ever changed (114,000 miles). Then a buddy mentioned there is a vacuum line to the tranny that may have cracked / come loose / etc. Any suggestions on these two possibilities - or any others? Thanks!
Lead Driver
Joined: Oct 2016
Posts: 6,185
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From: Houston/Sugar Land
Since the E4OD is controlled by the computer, running diagnostic codes can give you some help in determining the real cause of the harsh shifting.
Regardless of what you find, changing fluid and filter is in your future.
Regardless of what you find, changing fluid and filter is in your future.
Logistics Pro
Joined: Nov 2013
Posts: 3,928
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From: Mojave, Ca
Check for codes. You'lll probably find the problem. As sandy mentioned, your transmission is computer controlled; you don't have a vacuum line going to your transmission. Is there anything else not working correctly on your truck?
Lead Driver
Joined: Oct 2016
Posts: 6,185
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From: Houston/Sugar Land
Codes can be in the computer without a check engine light.
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3rd Gear
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Lead Driver
Joined: Oct 2016
Posts: 6,185
Likes: 633
From: Houston/Sugar Land
Key On Engine Off codes should show clues. If you have KOEO codes you need to fix them first before running Engine Running codes. Either test, the truck needs to be at operating temperature to properly test.
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1st Gear
Joined: Feb 2023
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One of the potential causes is a bad speed sensor or sensor connection in the rear differential. Without that working right the trans behaves as you describe. It's a $15 part and a 3 minute job so maybe worth trying. At least that was the cause of mine doing much the same and it was cured with a new sensor. I carry a spare now...
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