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Ford F250SD 4R100 Transmission

D

dhermesc

Well-known Member
I had posted on this a couple weeks ago. It was having issues with being very slow to upshift and sometimes not shifting into OD. Had the codes read at a shop - it had a clutch hanging up making it slow to go into reverse and the torque converter was not locking up. After the codes were read the transmission started working perfectly except it was still slow to engage reverse. I had assumed the issue was the connector from the transmission to the truck computer needed cleaned which they did when they read the codes. I drove it about 500 miles and it was working pretty much as well as one of the transmissions work - until Saturday. I drove about 50 miles and made two stops. At the second stop I jumped in and no forward gears. Reverse still worked but nothing going forward.

Apparently that's how most of these fail - just a few warnings then - nothing.

A local transmission shop is going to rebuild it for me. I was looking at one from ETE for $2600 but the wait is 5 weeks.
 
Not an answer to any question you might be posting, just a comment about my own experience.

I have a 2000 F550 with the 4R100 behind a 7.3. I've been thinking for a couple years that the transmission is probably going to go out, but it keeps on going. It shifts kind of hard and sometimes there is a delay in the shift, almost like a double shift when pulling hard and shifting into overdrive.

I have a tune on the truck, actually two different tunes from separate companies on the same controller. With the one tune the truck will not lock up the torque converter. With the other one it will. I went back and forth with the tuners a bunch of times to get the one tune to lock up the TC, the other one never could get it to lock up. With the factory programming the TC locks up normally.

I've had no codes on it at all.
 
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