Allison 6sp: Trans problem

[zeke38]

Codes are p0756, p0960, and p0877. Truck will barley move with accelerator held down and locks up rear tires when I let off. Its an ats stage 2. Ats is taking forever to respond to my emails so looking for insight here

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[Mike L.]

How long ago was it done?

 

[zeke38]

December 09

Also range shift inhibited is displayed eventually.

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[zeke38]

Anyone have the trouble trees gor those codes. They want mevto eliminate electronic possibilities

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[zeke38]

P0757 also showed up now

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[Mike L.]

If it locks up the rear wheels when you let off you have a welded clutch pack. Pull the pan, check your internal harness. Pull sump filter and peel it open to see what's inside.

 

[zeke38]

Ok. I dropped fluid. Nothing unusual about it. Ill drop the pan next. Thanks

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[zeke38]

Could this be my problem

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[zeke38]

filter looks good
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[Mike L.]

The wire can cause problems, but the plugged filter is your main issue. It looks like the filter is trying to suck itself inside out.

 

[zeke38]

Ok. It seemed like the filter was loose also. I could wiggle it back and forth. What's that wiring harness called. I could not find it in my manual. Its by itself and exits the trans case by the external spin on filter

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[Mike L.]

Internal wiring harness.

 

[zeke38]

Its diffrent from the one that exits by the passenger rear of trans

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[Mike L.]

Its diffrent from the one that exits by the passenger rear of trans

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Look again. it's not.

 

[zeke38]

Look again. it's not.

It was seperate because it was for the co pilot. Lol sorry mike forgot to mention that i had one. That's not the problem obviously. I'm gonna put a new internal filter on and check the solenoids and try it again.

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[zeke38]

All solenoids tested good. The code comes back after clearing by just turning key to run position.

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[zeke38]

Buttoned it back up today. P0960 still there. Moves fine now but won't shift outta 1st

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[Mike L.]

Buttoned it back up today. P0960 still there. Moves fine now but won't shift outta 1st

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You still have an open circuit at the main mod solenoid. That solenoid shares 12V with the F trim solenoid ( TCC ).

 

[zeke38]

Ok. Any idea where to buy a new external harness? When I put my new trans mount on a while ago the bolts stripped out the case causing the trans to pinch the wiring harness between the case and cab.

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[Mike L.]

Fix your existing wires.