86 c10 tranny slipping in low - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kenr427 · 11-04-2010, 08:11 AM

Hello everyone, just joined the list. I've been in lurk mode for awhile and have been reading posts. It really is nice to have a forum like this with people that are knowledgeable on these trucks!

I recently bought an 86 Chevy C10 from a friend that has been sitting for a couple years for $700. I was told that the only thing wrong was the carb....WRONG. It does need carb work still, but does run. I had to put brake lines on, a heater core in, caliper, rotor. When I picked it up and towed it home, it was low 3 qts. of tranny fluid. When I got it running and warmed up it ran well, but the tranny slips while trying to take off. Will this need rebuild or replacement, or do you think it may start working properly once the fluid has been in there awhile. Should I try an additive to swell the seals up in the tranny and if so, what?

I am beginning to wonder if I should of left this truck alone!! I had a 77 about 8 years ago, which I loved and wish I would of kept

70BLAZERX2 · 11-04-2010, 09:10 AM

did you flat tow it with the driveshaft still in? and if so how far?

James McClure · 11-04-2010, 09:12 AM

Welcome from a fellow new yorker. What type of trans? What does the fluid look & smell like? If it's a 4 speed, it's probably an early 700R4, if it's a 3 speed behind a small block it's probably a thm350c. If it's the 4 speed and the fluid is burnt and it smells bad you can try a fluid\filter change, but in all likelyhood replacement will be necessary. 350's are a dime a dozen and the rebuilds aren't all that expensive either. I'd rebuild it for you if you was closer. jim

kenr427 · 11-04-2010, 11:17 PM

70Blazer...I towed it with the motor running about 2 miles.

James...it's the 4 speed (3 with OD) Hoping I can pick one up at the junk yard if need be.

kenr427 · 11-04-2010, 11:19 PM

As far as the smell and color, it wouldn't register on the dip stick, so I couldn't tell by that. The new fluid I put in remains pretty clean and doesn't smell burnt, but then again I really haven't driven it only around the yard.

11-04-2010, 08:11 AM	#1
kenr427 Registered User Join Date: Oct 2010 Location: Johnson City, NY Posts: 3	86 c10 tranny slipping in low Hello everyone, just joined the list. I've been in lurk mode for awhile and have been reading posts. It really is nice to have a forum like this with people that are knowledgeable on these trucks! I recently bought an 86 Chevy C10 from a friend that has been sitting for a couple years for $700. I was told that the only thing wrong was the carb....WRONG. It does need carb work still, but does run. I had to put brake lines on, a heater core in, caliper, rotor. When I picked it up and towed it home, it was low 3 qts. of tranny fluid. When I got it running and warmed up it ran well, but the tranny slips while trying to take off. Will this need rebuild or replacement, or do you think it may start working properly once the fluid has been in there awhile. Should I try an additive to swell the seals up in the tranny and if so, what? I am beginning to wonder if I should of left this truck alone!! I had a 77 about 8 years ago, which I loved and wish I would of kept

11-04-2010, 09:10 AM	#2
70BLAZERX2 Registered User Join Date: Jan 2010 Location: GREENEVILLE TENNESSEE Posts: 1,311	Re: 86 c10 tranny slipping in low did you flat tow it with the driveshaft still in? and if so how far?

11-04-2010, 09:12 AM	#3
James McClure One shot, one kill. Join Date: Dec 2007 Location: Saratoga Springs NY Posts: 859	Re: 86 c10 tranny slipping in low Welcome from a fellow new yorker. What type of trans? What does the fluid look & smell like? If it's a 4 speed, it's probably an early 700R4, if it's a 3 speed behind a small block it's probably a thm350c. If it's the 4 speed and the fluid is burnt and it smells bad you can try a fluid\filter change, but in all likelyhood replacement will be necessary. 350's are a dime a dozen and the rebuilds aren't all that expensive either. I'd rebuild it for you if you was closer. jim __________________ 1984 K20 350M engine with 465,000 miles. Well, it's finally done!! Almost 2 years of work, but it was really worth the effort. Little stuff left to do is mount winch, wet sand & buff out and build belly pan\running boards. Body work takes lots and LOTS of beer!!!! God, Guts and Guns made America and God, Guts and Guns will preserve it! The worst thing you could do is get into my sights, but that don't matter, you'll never know it, cause you'll never hear the shotJim or Paladin whichever you choose.

11-04-2010, 11:17 PM	#4
kenr427 Registered User Join Date: Oct 2010 Location: Johnson City, NY Posts: 3	Re: 86 c10 tranny slipping in low 70Blazer...I towed it with the motor running about 2 miles. James...it's the 4 speed (3 with OD) Hoping I can pick one up at the junk yard if need be.

11-04-2010, 11:19 PM	#5
kenr427 Registered User Join Date: Oct 2010 Location: Johnson City, NY Posts: 3	Re: 86 c10 tranny slipping in low As far as the smell and color, it wouldn't register on the dip stick, so I couldn't tell by that. The new fluid I put in remains pretty clean and doesn't smell burnt, but then again I really haven't driven it only around the yard.



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