2000 5.4 4x4. 104k miles. Extended cab. Heres the issue, when youre at that spot on a slight upgrade and the tranny should down shift out of overdrive it will downshift kinda hard. Sometimes it does this and sometimes it wont. Its driving me nuts. I thought maybe change the fluid and filter and see what happens, but a tranny guy that I dont know from the other guy said dont waste your money its more than likely a broken spring behind a piston( blah, blah) cost you roughly $1500 to fix. Anybody ever had this issue or something similar? I put a new motor in this truck about 10k ago so I can wrench. It did this before the motor swap too.
My vote is also a broken spring in the valve body.
The trans is operated from the computer by operating electric valves.
They change fluid routing to effect the operation the computer decide to apply.
A spring being broken applies less tension on it's shuttle valve and causes an uncontrolled rise in pressure application to the servo.
This bang in a shft that is harsh.
Usually won't cause a problem but the rough shift you feel.
The pan has to be removed and the valve body taken down for inspection to find the spring causing the issue.
A good trans man knows what springs to look at for the peticular shift problem.
If you just replaced the motor, I think it's wise to fix the trans as well.
I would not think it is a $1500 job but!!!!!
what trans is it? 4r70w or e4od? 2x2 or 4x4 it all makes a difference! could be a broken spring like bluegrass says or a broken accumulator spring or a sticking shift valve and the list goes on. did the truck run hot? is that why you had to change the motor? the trans cooler is in the radiator.is it a harsh down shift into first? maybe your low roller clutch is bad. info man info! thats what us blah blah tranmission guys need.
blah blah tranny guys are helpful though. Its the r70 I think. Has the square looking pan. It doesnt do this hard down shift all the time though. Sometimes if your going up a hill and it downshifts on its own without putting your foot into it it will shift hard and sometimes it wont. If you put your foot into it a little, it again, does it sometimes but not always. Its 4x4 with the 5.4. Would taking the valve body down to find the spring be something I wouldnt want to get into, or is it doable for a novice wrench? Thanks for all the replys
Hi, did this get resolved? I've got pretty much the same issue with my 2001. The other strange thing I'll add: if I manually shift down (hit the button to turn off OD) it seems to shift fine. It only seems to do the hard shift if it's trying to maintain speed going up a grade or if I give it just barely enough gas to downshift. It's like there's a pause or slip between gears. The RPMs go up for a moment, then when it "connects" there's the loud thud.
2001 5.4 4WD
Last edited by vgavagan; 08-29-2014 at 10:33 AM.
Reason: forgot truck details
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