Elderly couple, neighbor's have '96 F-350 ,7.3turbo auto/trans. When it is idling and you put in d the converter will lock-up and shut the thing down. Not stall but grunt it to a hault. I had to put 2 feet on brake to keep from moving!! Talk about power braking it! I am car and gas guy but I told them I would try to help. Any Help on tech would be great, they can't afford to take to dealer.
I know when I apply my brakes the TC unlocks when driving down the road. Unless I got the TC locked. Does it lock in reverse or 1st gear with the selector there? With the manual lock switch it will not let it lock in those gears till the selctor goes into 2nd or drive.
From what I understand it is basically that the trans doesn't have enough fluid pressure to keep it from locking. It probably has the same issue when put into reverse. The loss of pressure could be from a weak pump, clogged filter, cracked filter, internal leaks etc.
Reverse has a higher line pressure schedule than the forward gears. A weak pump or an internal leak always shows up first in reverse because the pump can't keep up with the higher demand. If left to progress it will probably start doing it first gear, too.
there is a ground wire in the harness that if it gets grounded will lock the converter and shut it down in gear at idle.wire could be chafed somewhere grounding on frame or body?on super duties anyway,not sure if a 96 has the same comp controls or not. it probably does
It does, but on an SD at least, that wire is WAAAYY in there... Not that it's not possible, just want to check other things before they start tracing wires.
Chk your fluid level, and remove the trans pan seen several were the filter was laying in the pan.
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