GM 700-R4 questions.....

ss wannabee · 08-05-2010, 10:05 AM

Sorry for the non-performance questions...but my street vehicle ('88 s10 Blazer-2.8) lost both TCC and overdrive a few months back. When I say "lost"...they both come back from time to time....but VERY intermittent...Yeah, the truck should be in a boneyard...it has about 265K on it but still runs.... The other shifts seem ok...trans doesn't seem to be slipping...but I try to avoid highway driving...it's tough in 3rd gear...also the "check engine"
light comes on when doing over 50 with that high-mileage V6 screaming...but I think that's the vehicle speed sensor asking the computer...."where's overdrive?" I adjusted the TV cable with little results.....

I've been driving the truck anyway with mostly city driving and it does ok...but eats a bit more gas...Want to fix for highway diving...and want to try a "fix" WITHOUT complete over-haul.

Was thinking replace the TCC solenoid...and do a valve body cleanout...am I headed in right direction? Not sure if I want to drop the v/body....(too many pieces to lose)....how about a pour-in cleaner in this case? How about a product called "Sea-Breeze"...anybody use this stuff?

08-05-2010, 10:05 AM	#1
ss wannabee Senior Member Join Date: Jun 2005 Posts: 663 Likes: 0 Liked 7 Times in 7 Posts	GM 700-R4 questions..... Sorry for the non-performance questions...but my street vehicle ('88 s10 Blazer-2.8) lost both TCC and overdrive a few months back. When I say "lost"...they both come back from time to time....but VERY intermittent...Yeah, the truck should be in a boneyard...it has about 265K on it but still runs.... The other shifts seem ok...trans doesn't seem to be slipping...but I try to avoid highway driving...it's tough in 3rd gear...also the "check engine" light comes on when doing over 50 with that high-mileage V6 screaming...but I think that's the vehicle speed sensor asking the computer...."where's overdrive?" I adjusted the TV cable with little results..... I've been driving the truck anyway with mostly city driving and it does ok...but eats a bit more gas...Want to fix for highway diving...and want to try a "fix" WITHOUT complete over-haul. Was thinking replace the TCC solenoid...and do a valve body cleanout...am I headed in right direction? Not sure if I want to drop the v/body....(too many pieces to lose)....how about a pour-in cleaner in this case? How about a product called "Sea-Breeze"...anybody use this stuff?