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

RobH said:

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

Click to expand...

RobH said:

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

Click to expand...