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rpmdiag, Tech and Instructor
Category: Ford
Satisfied Customers: 7499
Experience:  Since 1975
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I have a ford L8000 fertilizer spreader truck with Allison

Customer Question

I have a ford L8000 fertilizer spreader truck with Allison transmission. Has 8.2 Cummings for motor. 2 weeks ago transmission seem to stall when entering curve & up a hill. Do not shift light came on. Got up on flat , shut truck off to reboot. Started back up & after a fee seconds light went off & I was able to take back off. There were no problems the rest of the day. Since then each early morning after starting truck up it doesn't want to shift correctly until it gets warmed up! After maybe traveling a few miles truck is fine for the rest of the day. My mechanic changed filter & oil last winter & truck has done fine until again a couple of weeks ago. What to do? Ideals on problem?
Submitted: 6 months ago.
Category: Ford
Expert:  rpmdiag replied 6 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Customer: replied 6 months ago.
Expert:  rpmdiag replied 6 months ago.

Here’s the sequence of events I follow:
Check fluid level and color. Make appropriate repairs.
Check shift solenoids with a scan tool in bidirectional mode if
applicable. Shift solenoids are inside the transmission and this is
the easiest way to check them.
Drop pan and inspect for excessive metal shavings inside pan.
Check valve body and clutches visually.
Hopefully you may not have to go this far, maybe you just were a
bit low on fluid.

Thanks, Ron

Expert:  rpmdiag replied 6 months ago.

If you are satisfied with my answer, I would greatly appreciate a 5
star rating now and I will still assist you after you have rated me
too if another question pops up. I don’t get credit for helping you
until you rate me.
Thanks again, Ron