Anyone know if Duramax 4l80e will work on a gas motor?
#3
Thanks. I had a 4L85e in my last build and it was quiet and flawless. But now I'm reading that the 4L85's are noisier? I guess every trans is different and no one knows until they get it installed and turn off the torque management. I know I've read that eliminating tm can eliminate the 4l85e straight cut plentary gear noise, apparently.
#4
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iTrader: (22)
Thanks. I had a 4L85e in my last build and it was quiet and flawless. But now I'm reading that the 4L85's are noisier? I guess every trans is different and no one knows until they get it installed and turn off the torque management. I know I've read that eliminating tm can eliminate the 4l85e straight cut plentary gear noise, apparently.
#6
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
The 4L80E/4L85E automatic transmission may experience a condition of planetary gear whine noise in first and second gear.
The planetary gear noise is typically louder in first gear as compared to second.
Recommendation/Instructions
This planetary gear whine noise can be characteristic of the 4L80E/4L85E.
The vehicle should be compared to an identically built vehicle (same GVWR) for comparison before attempting any repairs.
If it is determined that a vehicle has an abnormal amount of noise and the transmission was built after 9-01-03, perform the Rear Unit End Play Check (SI Document ID # 52027).
The correct end play is between 0.127-0.508 mm (0.005-0.020 in).
If end play is out of specification, inspect and replace the output planetary gear set (661 - Output Carrier Assembly and 650 - Sun Gear) as necessary.
Set rear end play between .005" - .020" using correct selective thrust washer (674). Target between .010"-.015".
If end play is within specification, replace the transmission assembly. Refer to bulletin 02-07-30-029A before ordering the transmission assembly.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
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#8
Mod with training wheels
iTrader: (16)
Disabling torque management won't change the whine. Torque is only reduced or 'managed' during shifts. That's why they detune engines (not rely on transmission to request steady state torque reduction) in front of weaker transmissions, which is the case with the Duramax in front of the 4L85e in vans.
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