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Allison Transmission Problem

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marka683

Well-Known Member
Joined
Dec 1, 2015
Messages
82
Location
Chicago
Occupation
Mechanic
2005 Chevy C4500 8.1L LCT1000 transmission. All shifts are late, main line pressure is high spikes up to 350 PSI, Hooked up the scanner and it will not complete the calibration process. No codes, oil clean no debris in the pan.
 
M

mikebramel

Senior Member
Joined
Jul 15, 2012
Messages
1,612
Location
milwaukee
Don't know about an allison but most other transmissions that would be related to a problem with the proportional valve that controls the line pressure?
 
B

Birken Vogt

Charter Member
Joined
Nov 30, 2003
Messages
5,323
Location
Grass Valley, Ca
marka683 said:
Hooked up the scanner and it will not complete the calibration process.
Click to expand...

What exactly does that mean? Comm failure or something?

I had a TCM go bad on a 3000 series a few years newer so don't count that out as a possibility. "They" say computers rarely go bad but it happens more often than it ought to.
 
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