'94 B4000- tranny thoughts
B4000's up through 1994 have the A4LD overdrive automatic transmission.
Over a run of several years, Ford made several upgrades.
1994 was the last year for the A4LD, and has all the upgrades that Ford made.
See 'My A4LD Rebuild Diary' here on TRS for a really good in-depth look at the transmission.
Read the 'Diary' for a description of the upgrades.
I used the 'Diary' along with the Ford factory manual when I rebuilt mine.
My impression reading the forums is that the trans is OK as long as you don't beat it to death.
Also, if you tow a trailer, take it OUT of Overdrive!
One other thought:
If the truck has a BUNCH of miles on it, and if you do get some odd shifting, I would suggest:
-drop the pan, change the filter & fluid,
-do a full fluid flush,
If there is a delay when you shift into Low or reverse:
-pull the 'low' band hydraulic solinoid (the round thing next to the valve body, visible after you drop the pan to change the filter.)
NOTE: It's not hard, but there is a spring behind the round cover. READ the 'A4LD Rebuild Diary' for detailed information before you do this!
If you have odd shifting in the higher gears:
-replace (or have a shop replace) the hydraulic shift solinoids that are accessible via the round covers (about 2-1/2" to 3" diameter) on the side of the transmission, behind the heat shield.
This will probably include removing the exhaust Y-pipe to gain access, but you should NOT have to drop the tranny.
We bought the truck with 170K+ miles and a bad transmission, my daughter and I rebuilt it for her as her 'first car'. (I'm a big believer in having the kids know what is going on under the hoood, and working on the car makes them respect the machine more than just tossing them a set of keys!)
In our case, I believe the reason that the trans had failed was:
1) heat from the exhaust pipe caused the 'solinoids' (which are sort of rubber-coated pistons, with a rubber lip seal) to get hard, so that they could not form a really good seal.
2) the previous owner, after driving the truck like Granny for many years, gave it to his son, who dogged it to death.
I think that the solinoid pistons got hard, could not make a good seal, and so could not hold full pressure. Without full pressure, the bands did not have enough grip under 'abuse' conditions, and started slipping. We found the #2 band had failed, tearing up the drum it runs on.
Again, the 'A4LD rebuild Diary' is GREAT!!
All the Best!
Jim Jelinski
PS- The kid 'showed her mettle' sticking with it through the transmission rebuild.... to go off to university, I bought her a new Mustang GT 'vert!
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'94 B4000 A4LD auto, stock.