Allison 5sp: TCM reflash

[JustinD]

I recently had a communication issue with my TCM, I had an 03 TCM and it works fine except the D doesn't light up when I go to into drive. Can I reflash it with EFI just do a full reflash to an 02 TCM OS?

 

[blk smoke lb7]

Are you sure it's not the cluster.My neighbors truck kept looking 1 after another until he had 1 or 2 left

Got the cluster rebuilt and all is good now

 

[delong_1]

To answer your question yes you can full flash in any 5 spd os

 

[THEFERMANATOR]

Yes yo ucan full flash it as I have an 05 TCM in my 01 running an 01 OS. Chances are though your cluster is the problem not the TCM OS. Many here have run the 01 TCM in 05 trucks with no gear display issues.

 

[NC-smokinlmm]

If its the cluster try Gauge Pegged if you don't want to rebuild it yourself. They are fast curtious and cheap to boot..?