Sick 6L80 Transmission - P0700 & B2AAA, P0741 & B2AAA - Resolved $$$

[RobH]

Picked it up from the local Chevy dealer this afternoon. Reman Gm Transmission which includes the torque converter.

Transmission with converter - $4042.80 - 42.80 = $4000
Labor 9 hours @ $170 = 1530
Misc. parts, fluid, etc. = 172
Transmission change out sub-total = 5702

70C/158F Thermal Bypass Valve 86774933 = 88
Rear engine Seal labor 1 hour @ $170 = 170
Rear Engine seal Part # 12705663 = 98
Grand total = 6058
Plus Texas Sales Tax

So far it is behaving. The temp is running 150°F ±1°F in 90°F ambient temperature.

I didn't ask why there is a charge for the Service Bulletin Thermal Bypass Valve. Does the transmission not come with a Thermal Bypass Valve? Are they still installing the 90C valve a year and a half after the service bulletin came out and charging the customer for the service bulletin valve? Or did I just get charged for it because I said I wanted it?

I asked for the rear main seal to be replaced as suggested by THarber. Hopefully, one and done.

The GM warranty appeared to be more workable, especially on the road. I never did get a price out of AAMCO. The Jasper warranty gave Jasper the right to have the transmission sent back to them for evaluation. I didn't want to do that on the road someplace.

Thanks again for everyone's help. Rob

 

[SpyShops212]

Thank you very much for your info, Nick. If I am hearing you correctly, you are recommending a GM re-manufactured transmission. Apparently the transmission does not come with a torque converter. Thank you for the info on the lockup clutch lining thickness.

Does the Jasper transmission come with a decent torque converter or is the torque converter separate with the Jasper transmission also? Jasper information sheet describing some upgrades attached. I can ask them Monday if their transmission includes the converter.

I have deliberately taken it easy with the engine and transmission for the last forty thousand miles since I bought the Tahoe, deliberately letting off on the gas when the transmission is about to upshift. I generally control/allow the upshifts with the rocker switch on the shift lever. I have been trying to drive the engine and transmission for longevity.

If I have to source the torque converter separately from the transmission, who would be a recommended source?

Apparently the GM and Jasper transmissions have the same three year/100,000 mile warranties with nationwide service. It might be easier to get the labor if I get a GM transmission. I might run into delayed parts availability. Or a statement that "we con't get to it for two weeks". The answer is to get a transmission which will not need warranty support.

AAMCO will give me a three year/50,000 mile warranty.

Are the 6l80 and 6L90 the same size and equivalent otherwise? If so, I might go with the 6L90 even though it might be overkill for my use just to increase the odds of avoiding getting a trip messed up like my current trip. I really dislike automatic transmissions although I have had some good ones. I've had good service with my seven cars/SUV's with manual transmissions. Plus my family has had five other vehicles with manuals in my lifetime. Oh well.

I've traveled a little over 2,800 miles since it started acting up. 360 more miles gets me home. At least I am in Texas now and my son-in-law can come get me if it dies.

I suspect that an auxiliary transmission cooler is also cheap insurance. My 1995 ex-highway patrol Caprice had one from the factory in addition to the heat exchanger in the radiator tank.

Thanks again, Rob

Wow, This is the winner and it’s great they loan you the programmer.

 

[donjetman]

I just came across this thread.
It is my understanding that Gerald Kosub Transmission Service Hwy 87E San Antonio eastside is highly rated. They are always busy and the shop is spotless, you can eat off the floor.

 

[San Diego Tahoe]

Picked it up from the local Chevy dealer this afternoon. Reman Gm Transmission which includes the torque converter.

Transmission with converter - $4042.80 - 42.80 = $4000
Labor 9 hours @ $170 = 1530
Misc. parts, fluid, etc. = 172
Transmission change out sub-total = 5702

70C/158F Thermal Bypass Valve 86774933 = 88
Rear engine Seal labor 1 hour @ $170 = 170
Rear Engine seal Part # 12705663 = 98
Grand total = 6058
Plus Texas Sales Tax

So far it is behaving. The temp is running 150°F ±1°F in 90°F ambient temperature.

I didn't ask why there is a charge for the Service Bulletin Thermal Bypass Valve. Does the transmission not come with a Thermal Bypass Valve? Are they still installing the 90C valve a year and a half after the service bulletin came out and charging the customer for the service bulletin valve? Or did I just get charged for it because I said I wanted it?

I asked for the rear main seal to be replaced as suggested by THarber. Hopefully, one and done.

The GM warranty appeared to be more workable, especially on the road. I never did get a price out of AAMCO. The Jasper warranty gave Jasper the right to have the transmission sent back to them for evaluation. I didn't want to do that on the road someplace.

Thanks again for everyone's help. Rob

Hi @RobH with the torque converter GM included, do you know if it's the same OEM torque converter, or is it an upgraded one with a billet cover? Thanks.