SURGING PROBLEM
I have a 2007 Winnebago Adventurer Model 35L with a Workhorse Chassis with a 8.1L Chevy engine and a 1000 model six speed Allison Transmission. While running on level terrain at about 60 to 65 mph the...
Forum Discussion
Sounds like the torque converter is unlocking them locking back up. Most scanners and even free phone apps and using a bluetooth dongle will show torque converter clutch (TCC) status. Watch to see off the command is being lost to lock. If the command is not changing, then tapping the wiring at the trans and adding a light might be needed to prove a weak connection to the solenoid.
Unfortunately most mechanics will not pursue without a CEL as a starting point. And at $100+/hr it can get costly for a shop to try to track down an intermittent problem.
I had a TCC lockup solenoid fail on a 4L60E that resulted in weak and no lock conditions. It was easy to access requiring only dropping the pan. I don't know where it is on the 1000.
Unfortunately most mechanics will not pursue without a CEL as a starting point. And at $100+/hr it can get costly for a shop to try to track down an intermittent problem.
I had a TCC lockup solenoid fail on a 4L60E that resulted in weak and no lock conditions. It was easy to access requiring only dropping the pan. I don't know where it is on the 1000.
