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My son bought a 1999 F250 Diesel about a year ago. The seller gave him receipts showing that the 4R100 had been rebuilt and a new T.C. installed 25k miles before the sale.
The problem is that it is slipping. He says it started with 2nd gear, now it will hardly move in 1st.
Fluid smells a little burnt. We pulled the transmission pan expecting to find lots of friction material. It does not have as much as I thought it would, not as much as I have found in the the pans of the few other auto trans I have seen with worn out frictions. Below are pics of the inside of the pan.
Or, is it the T.C. that is slipping. I have never had a vehicle with a bad T.C. How do you diagnose it? Any help/ideas for me? I have experience rebuilding (GM) Turbo 400's and 4L60's. Never had a ford AT apart.
Former Ford Transmission Engineer? I see I came to the right place to ask my question!!!
What kind of damage do you expect I will find, besides worn out frictions and steels?
What sort of parts do you recommend installing during a rebuild? People are telling me to go with steel planetaries and a "Tugger" (Transgo?) reprogramming kit.
What did you do as a AT engineer? Design? R and D? I've been a machinist for over 30 years, and I am deranged enough to find the internals of AT's fascinating. And bewildering. I can barely follow how they actually work. I can't even imagine what goes into designing them.
I expect that you'll just find worn out friction material, but there may have been enough heat to damage the steels, too. I don't see metal chunks, so the hard parts are probably fine.
If you are not modifying it for a lot of power a standard master rebuild kit will have everything you need.
Most of my career at Ford was in what we called calibration. I developed the tunes that shifted the transmission. I spent most of my time in a car or truck on a test track. I also did transmission cooling for the last three years there.
