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Old 12-06-2019, 05:36 PM   #1
First c10
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TCM replacement for a 6L80E

Hey guys
I started working on my sons 70 again with an LC9/6L80E trans. After the teams rebuild I started having a problem with the very first shift into second each time I start the truck and put into drive. As I reach the shift speed it would like shift into 2nd or maybe even reverse really really hard for a second and then not do it again until I shut the truck off and restarted it then try and drive it again. After the first time it doesnít do it again and runs/shifts normal. I talked to Mike at Century Transmission which is where I got the rebuild parts and he told me that the TCM may need to be re flashed from a GM dealer or someone with that capability. I took to a shop near me and he tried to reprogram with a new tune and it came back with an error stating it needed to be removed and reflashed on the bench.
Has anyone done this to a 6L80 trans TCM?
I thought I would just buy a rebuilt one but they say they need to be programmed. So I donít want to buy a new one if I can just have mine reprogrammed.
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1956 Chevy Bel Air 2 door
1956 Chevy 210 4 Door
1970 K20 LWB project the Hulk build w/4.8L-ly4/4L60E HULK BUILD
1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E
1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD*
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Old 12-08-2019, 03:18 AM   #2
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Re: TCM replacement for a 6L80E

Wow nobody has any idea?
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1956 Chevy Bel Air 2 door
1956 Chevy 210 4 Door
1970 K20 LWB project the Hulk build w/4.8L-ly4/4L60E HULK BUILD
1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E
1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD*
GO GO!!!
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Old 12-08-2019, 11:29 AM   #3
prodjay10
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Re: TCM replacement for a 6L80E

Maybe someone else can chime but I thought the ecm learning for the transmission had to be reset after a rebuild. Not sure if it's the case with all the chevy electronic transmissions.
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Old 12-09-2019, 02:54 AM   #4
First c10
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Re: TCM replacement for a 6L80E

There is a relearn but my problem is with the tcm program according to century transmission
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1956 Chevy Bel Air 2 door
1956 Chevy 210 4 Door
1970 K20 LWB project the Hulk build w/4.8L-ly4/4L60E HULK BUILD
1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E
1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD*
GO GO!!!
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Old 12-11-2019, 03:48 PM   #5
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Re: TCM replacement for a 6L80E

Has anyone replaced the TCM in there swap? if so what did you have to do with the programming?
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1956 Chevy Bel Air 2 door
1956 Chevy 210 4 Door
1970 K20 LWB project the Hulk build w/4.8L-ly4/4L60E HULK BUILD
1970 C10 Yellow/White Deluxe LWB w/ 5.3L-LC9/6L80E
1968 K10 LWB Dark green my son calls it "THE HULK Jr"HULK JR *SOLD*
GO GO!!!
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Old 12-11-2019, 04:27 PM   #6
rowdy11
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Re: TCM replacement for a 6L80E

I didn't replace my TCM or reflash it, but will be watching for this issue because my ECM has been re-flashed and programmed. I also understood that a new or reflashed TCM needed to go through a "re-learn."
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