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Allison OEM Discuss repairing & maintaining an OEM Allison automatic transmission. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 11-14-2019, 11:11 AM   #11 (permalink)
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Tell us what you have done so we don’t repeat what you have tried.

Do you have any codes? Don’t like reading threads and 100 posts later they mentioned I forgot I have code P****

Have you done these?
Checked to see if your cable is bound up.
Disconnect cable from trans. Put trans into park then adjust cable to match trans lever to where it snaps on freely.


The shift cable comes in two pieces and where they meet there's a slack adjuster. It's on the drivers side of the truck right below the door on the outside of the frame rail. Here are the adjustment instructions:

1. Place the steering column shift lever back into the park (P) position.
2. Raise the vehicle.
3. Ensure that the transmission manual shaft lever is in the park (P) position.
4. Pull the white cover back to expose the natural colored lock. Under the lock, insert a flat bladed screwdriver under the lock ramp located at the top of the lock. The lock will pop up, and the transmission end will move slightly away from the shifter end.
5. Push the end of the transmission end inside the shifter end until the blue spring on the transmission end is fully compressed, this will engage the inner wire and lock both wires together.

Important: DO NOT hold the transmission end during this operation, this will result in a mis-adjusted cable.

6. Release the transmission end and allow the spring to tension/adjust the cable system.
7. Pull the white cover on the shifter end back.
8. Push the natural colored lock button down to engage the locking teeth on the transmission end.
9. Release the white cover.
10. Verify the white cover conceals the natural colored lock.

Last edited by Rvn4me; 11-14-2019 at 11:25 AM.
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Old 11-14-2019, 11:18 AM   #12 (permalink)
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Thank you

2007 LBZ 6.6L
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Old 11-14-2019, 04:53 PM   #13 (permalink)
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I guess Iím missing something obvious. I thought truck and van Allisonís are shifted via cable until in drive. At which point you can select a specific forward gear. What type of vehicle do you have?
Moonshine Tuned
Stock Air, Fuel, Trans
5Ē Exhaust w/ missing kitty
20Ē Hoss w/ 305s

Big Blue Nation
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