4L80E at it again. Loses overdrive. - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 10-08-2019, 09:06 AM   #1 (permalink)
scasanova
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4L80E at it again. Loses overdrive.

The truck is my 1993 c3500 with a 4l803 trans. I had issues with it before and I had fixed them with good results. Here is that thread.
https://www.dieselplace.com/forum/63...ifts-hard.html

Now, it is losing overdrive when it gets hot. If I let the truck cool off and restart it the problem goes away. In the morning when the truck is cold it works perfectly.

I replaced the torque converter, input speed, output speed, and throttle position sensors. That fixed my no OD problem from before. It was working great for a few thousand miles. Any suggestions are greatly appreciated.

I plan on cleaning the connector for the harness and checking my brake light switch.

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1976 Chevy Corvette, 350 engine, 4 speed manual, posi, 6.5 conversion on the horizon
1991 GMC C3500, 350 TBI, 700R4, 4.10, Dually, knapheide body, 6.5 KW Onan Generator
1993 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the vin, WVO conversion with separate fuel filters and pumps, 2 micron filter after pump, 12 micron fuel water filter before pump, filter sock delete, front end rebuild, trans temp, oil temp, fuel temp, fuel pressure, The daily driver
1996 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the VIN, home made TM, vac pump delete, complete front end rebuild down to the coil springs, bearings and steering rack, HO water pump, Leroy oil lines, PMD relocate to frame, 12 micron fuel water filter before pump, filter sock delete
1997 Chevy C3500HD, 6.5L, NV4500, 4.63, Dually, 10 lug hubs, F in the vin, former bucket truck undergoing a crane conversion, 6BT conversion on the horizon
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Old 10-08-2019, 11:40 AM   #2 (permalink)
Tommygunner
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Is the trans not shifting into OD (4th gear)? Or is the torque convertor not locking up?

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Old 10-08-2019, 01:32 PM   #3 (permalink)
scasanova
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Once it gets hot and I push it hard it loses OD for sure. 1-2 and 2-3 shift very hard. Like it has full line pressure. Once in 3rd, it feels a little soft, maybe not locking up in 3rd.

I should add that the torque converter is a brand new Florida torque converter, low stall. It is correct for the truck and identical to the one it replaced. When the truck is cold or not fully warm, it shifts very quick and firm. Everything feels as it should.
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1976 Chevy Corvette, 350 engine, 4 speed manual, posi, 6.5 conversion on the horizon
1991 GMC C3500, 350 TBI, 700R4, 4.10, Dually, knapheide body, 6.5 KW Onan Generator
1993 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the vin, WVO conversion with separate fuel filters and pumps, 2 micron filter after pump, 12 micron fuel water filter before pump, filter sock delete, front end rebuild, trans temp, oil temp, fuel temp, fuel pressure, The daily driver
1996 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the VIN, home made TM, vac pump delete, complete front end rebuild down to the coil springs, bearings and steering rack, HO water pump, Leroy oil lines, PMD relocate to frame, 12 micron fuel water filter before pump, filter sock delete
1997 Chevy C3500HD, 6.5L, NV4500, 4.63, Dually, 10 lug hubs, F in the vin, former bucket truck undergoing a crane conversion, 6BT conversion on the horizon

Last edited by scasanova; 10-08-2019 at 01:37 PM.
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Old 10-08-2019, 02:03 PM   #4 (permalink)
johnH123
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Go on google an look up '4l80e AFL valve failure' and see if your problems match that.
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Old 10-08-2019, 03:04 PM   #5 (permalink)
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Codes?
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Old 10-08-2019, 08:17 PM   #6 (permalink)
56pan
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Might want to remove your ignition switch, open it up and check for worn corroded contacts. That will cause the exact problems you're having.
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Old Yesterday, 09:32 PM   #7 (permalink)
scasanova
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I have a new ignition switch to replace it with once I get the time.



I have more information as far as symptoms go. I have been driving it around all week and it only acts up over 150F. When it does 1-2 shifts kind of hard but the rest are very soft, including the 3-4 shift. OD works most of the time. Only when I push it hard does OD drop out and a quick restart will fix it.



I am thinking it might be a TCC solenoid. Does these symptoms help anybody narrow it down?
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1976 Chevy Corvette, 350 engine, 4 speed manual, posi, 6.5 conversion on the horizon
1991 GMC C3500, 350 TBI, 700R4, 4.10, Dually, knapheide body, 6.5 KW Onan Generator
1993 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the vin, WVO conversion with separate fuel filters and pumps, 2 micron filter after pump, 12 micron fuel water filter before pump, filter sock delete, front end rebuild, trans temp, oil temp, fuel temp, fuel pressure, The daily driver
1996 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the VIN, home made TM, vac pump delete, complete front end rebuild down to the coil springs, bearings and steering rack, HO water pump, Leroy oil lines, PMD relocate to frame, 12 micron fuel water filter before pump, filter sock delete
1997 Chevy C3500HD, 6.5L, NV4500, 4.63, Dually, 10 lug hubs, F in the vin, former bucket truck undergoing a crane conversion, 6BT conversion on the horizon
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Old Today, 09:41 AM   #8 (permalink)
johnH123
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TCC solenoid has nothing to do with the 3-4 shift or 4th gear. It controls the clutch inside the torque converter when you are cruising so that you get better mileage. It eliminates the 'slip' of the torque converter.

How fast does your tranny heat up, and what temp does it run at when unloaded and on the highway?
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1993 K3500- 4x4, single cab/long bed, single rear wheels, 4.10 rear end, F vin, Nv4500 manual, factory red interior.


Gone but not forgotten: 2001 silverado 2500hd CC/SB, 4x4, 6.0 vortec, 229k miles when I traded it.
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Old Today, 05:57 PM   #9 (permalink)
scasanova
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It runs 150 to 180 unloaded on the highway. It runs 150 to 200 while towing. It can reach around 200 in stop and go traffic on a hot day while driving it hard. It takes 10 to 15 min to reach 150 with gentle driving.


I will have the the codes read next week when I get a chance to go to my trans shop. So far I have not had a SES light come on.



Today I drove 40 miles one way and returned several hours later. It was shifting softly for most of the drive. I lost OD once on the way out when I made it downshift from 4 to 3. A rolling restart fixed the OD issue. It drives fine at 60 to 70 MPH on the back roads. If I drive it very gently it works decently, which is why I am still driving it.
__________________
1976 Chevy Corvette, 350 engine, 4 speed manual, posi, 6.5 conversion on the horizon
1991 GMC C3500, 350 TBI, 700R4, 4.10, Dually, knapheide body, 6.5 KW Onan Generator
1993 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the vin, WVO conversion with separate fuel filters and pumps, 2 micron filter after pump, 12 micron fuel water filter before pump, filter sock delete, front end rebuild, trans temp, oil temp, fuel temp, fuel pressure, The daily driver
1996 Chevy C3500, 6.5L, 4L80E, 4.10, Dually, F in the VIN, home made TM, vac pump delete, complete front end rebuild down to the coil springs, bearings and steering rack, HO water pump, Leroy oil lines, PMD relocate to frame, 12 micron fuel water filter before pump, filter sock delete
1997 Chevy C3500HD, 6.5L, NV4500, 4.63, Dually, 10 lug hubs, F in the vin, former bucket truck undergoing a crane conversion, 6BT conversion on the horizon

Last edited by scasanova; Today at 05:58 PM.
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