Help with Trans Problems
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New User
Joined: Oct 1999
Posts: 18
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Help with Trans Problems
I have a 91 Bronco with 302 and E4OD.
When cruising on the highway at 55-60 MPH, the trans will slip out of OD ocasionally. I doesn't happen at higher speeds. Sometimes it seems as though it partially slips out of OD (ie. RPM jumps up but not as though it went down a full gear) TC slipping? At about the same time this started happening, I started getting a loud and violent thump infrequently on upshift in other gears when going easy on the gas. Shifts smooth when heavy footed.
I have religiously flushed and replace the fluid in the trans and tc every 30,000 miles. The trans has about 140,000 miles on it.
Is there any hope for this trans? Is 140,000 all I should expect from an E4OD. Where should I start looking? TC? Rebuild? Replace?
__________________
Mine - 91 Bronco
Hers - 99 Expedition
When cruising on the highway at 55-60 MPH, the trans will slip out of OD ocasionally. I doesn't happen at higher speeds. Sometimes it seems as though it partially slips out of OD (ie. RPM jumps up but not as though it went down a full gear) TC slipping? At about the same time this started happening, I started getting a loud and violent thump infrequently on upshift in other gears when going easy on the gas. Shifts smooth when heavy footed.
I have religiously flushed and replace the fluid in the trans and tc every 30,000 miles. The trans has about 140,000 miles on it.
Is there any hope for this trans? Is 140,000 all I should expect from an E4OD. Where should I start looking? TC? Rebuild? Replace?
__________________
Mine - 91 Bronco
Hers - 99 Expedition
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Help with Trans Problems
In 1991 the E40D tranny's were not very good. The way they were set up to run did not promote a long lifespan. Ford has made many updates to the parts in this tranny and they should all be replaced when you rebuild it. My 1991 E40D went about 190,000 before it quit behind my 6 cylinder. You may only have a small problem. Go through the whole page here and I and some other people have answered similar questions like yours.
