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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.


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Old 09-03-2019, 03:44 PM   #1 (permalink)
detroitMachine
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Location: Kamloops BC
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Pacific Iron Mountain Truck Club Member

Tranny failing? Torque converter?

Hi all, hoping to get some info on my tranny symptoms.

Vehicle:
1994 K1500
4L80E
350,000 km
Stock for the most part
half ton - NO TRANNY COOLER
Tranny fluid level good
No tranny odor
Metal shavings on trans input speed sensor magnet when removed

Recent Work Done (tranny related):
Tranny flush + filter (2 yrs)
Trans input speed sensor (code 74)
New flex plate and starter
Wastegate solenoid (no idea if intermittent loss of boost messes things up)

Symptoms:
Regularly - lose torque converter lockup, no cruise, need to re-start vehicle and back to normal
Previously - torque converter locks, unlocks, locks, unlocks, etc. Solved (I think) by trans input speed sensor/WG solenoid
Previously - the first torque lockup of the day on the highway would sound like I'm going over highway rumble strips for 2-3 seconds (the ones that wake you up)
Rarely - hard shift 1-2, vehicle needs re-start and shifts OK
Rarely - vehicle chatters/shutters when taking off from a stop (high heat)


I hope this is clear. Lots of things going on, tough to explain over the internet but let me know if you guys have any insight.

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94 K1500 L56 Z71 extended cab short box
NEW: heads, pmd, injectors, fuel hoses, fluids, filters, CDR
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Old Yesterday, 03:40 PM   #2 (permalink)
Dabbs_diesel
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My TC was locking and unlocking on my 4l80e and it eventually blew the front pump shafts seal and dumped all the fluid out of the belhousing drain hole. I ended up just putting a different Trans and converter in the truck.

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