2001 Allison 1000 5 speed. Completely rebuilt transmission high performance clutches triple dish torque converter. So got the transmission put back in the truck got it back on the road drove for about two weeks and the truck went into limp mode and now has no forward gears. Pulled transmission out checked all the clutches no burnt clutch is everything looks good in there.. still no forward gears. New safety neutral switch, new ignition switch. Oh and The D is flashing Also Please help I’m at a lost!!!
No forward gears and D is flashing
- Thread starter Raffinator
- Start date
The D flashing on an 01-02 is range shift inhibited. That means the TCM has detected a serious fault and is not allowing any gear to engage. You need a good scanner to read TCM codes, without it you're just wasting time & money.
The trans has been pulled three times and looked at everything in there and is correct and no clutch material has been burnt. Everything on the transmission is new also. It was hooked up to a tech 2 to get the codes but I forget what they are. I’m waiting on him to send them to me and then I’ll post them
Have them check as Mike stated above. :thumb:
Just because the clutches and other hard parts look ok, doesn't mean they need to look past the solenoids and the valve body for the issue...
I would also like to make a general statement not directed at any one one person.
Just because a transmission was shifting fine and only started slipping before a so called "rebuild" Doesn't mean they don't have to clean and go through the valve body either. You would be surprised what you can find in the small passages on any transmission....