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Hello, I have a 1992 f150 with the 4.9, 300 and the e4od transmission. This truck was my grandpas and it has been handed down to me. My grandpa passed so I can not ask him questions. He did keep logs, and it says new transmission and transmission cooler, now its 40,000 miles later but about 12 years since his log book says he replaced the transmission.. so when i am driving through town, after it warms up, the truck slams into 3rd and 4th gear and sometimes 2nd gear also. Somethimes it will rev up like its slipping and slam into the next gear. Is this a common problem for a mlps? Maybe a torque converter? The check engine light was disconnected by my dads mechanic and i havent tried pulling codes. Any input or help would be greatly appreciated! I love my truck but I am slowly losing patience with it.
There are two ways to fix this. One, start randomly replacing parts such as the MLPS and the torque converter. Eventually, you probably will fix the right thing and all will be well. This route will usually cost several thousand dollars before you get lucky. Or you could read the codes (FREE!) and know where the problem lies.
Thank you mark, for the link and the reply. I was not sure if reading the codes on these older rigs could definitely point me in the right direction. I really appreciate your response and the link as well. I will be trying to read the codes tonight after work and put as little money necessary into it. I love these forums! They have been so much help thanks to guys like you!
These transmissions are very intuitive but when they start throwing codes they present as hard shifting. The slipping can be several things.
How long have you has the truck and how long had the truck been sitting since you received it? Has it always behaved this way for you?
My 1991 did what yours was doing when I got it from an old guy and it had been driven little over its life, just 79,000 miles. The result was sticking valve bodies causing codes. My truck also had a sticking torque converter vanes which was causing pressure issues and more codes.
First clear the codes and drive it. I would plan on a fluid change but don't do it before you drive it a bit. I changed mine right away and wound up doing it twice because I wound up replacing my sticking valve body.
Before you go out and buy a valve body kit let me know, I have one as well as the higher capacity 4x4 oil pan and high capacity filter you can have cheap.
I wound up going with a performance valve body from Punisher and a cast aluminum oil pan which along with driving it and changing the oil a second time has it working perfectly.
No the vanes do not move but under the right conditions the atf gums up and sticks to the inside of the converter or at least it did mine and caused a shutter and pressure issues.
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