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#1 |
Registered User
Join Date: Nov 2012
Location: Newnan Georgia
Posts: 36
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Transmission woes!!!
'77 C20 2WD w/ TH400...Ran trans fluid low by accident and after refill it never shifts right, been told flush would not help w/ no history on the truck and good fluid it still shifts enough to pop my neck each time. Rebuild or replace? Don't want fancy gears or performance stuff, just equal to what I have now. Advantages to rebuild/replace. where to go for quality? I am transmission novice!!! Help from experts please!
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'77 C20 Camper Special w/ 454 ![]() |
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#2 |
Registered User
Join Date: Jul 2012
Location: MA
Posts: 207
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Re: Transmission woes!!!
Likely an accumulator is somehow stuck. Based on that, and possibly a 40 year old transmision, I'd be tempted to rebuild it. Have a reputable local transmission shop go through it, replace wear parts, seals and any defective hard part, install a new torque converter (they do get worn over time) and install a new fluid cooler, bypassing the radiator cooler. i like to add a transmission temp guage on each of my rigs too.
The 400 is supposedly the easiest transmission to rebuild, is plentiful, and has been around since the stone ages. Usually they can be done for a good price with modern wear parts.
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2012 Chevy 2500HD, 6.0L, 6spd auto, 4x4, ECSB 1987 GMC V3500 Dump, 6.2L diesel, TH400 1983 GMC K2500 - awaiting its restoration and Cummins swap. |
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#3 | |
Registered User
Join Date: May 2010
Location: Rochester NY
Posts: 831
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Re: Transmission woes!!!
Quote:
When you say bypass the radiator cooler, are say not use it at all? Im not sure I would do that, even with a one with a fan. Why not tap it in after the radiator?
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1973 k20 Suburban 350 1974 Custom stepside c-10 250 1975 Chevy stepside 454 1986 K30 Crewcab SRW 350 R.I.P- glimmertwin01- board member and good friend, you will be missed |
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#4 | |
Registered User
Join Date: Feb 2013
Location: Cary, NC
Posts: 816
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Re: Transmission woes!!!
Quote:
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Austin 1996 Chevrolet K1500 Silverado ![]() 1979 Chevrolet K10 Scottsdale - Carolina K10 - My 4.8L Twin turbo build - Project Short Stroke - Instagram - TheBlueBomber1996 |
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#5 | |
Registered User
Join Date: Jul 2012
Location: MA
Posts: 207
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Re: Transmission woes!!!
Quote:
But, I would not run any automatic transmission without a cooler! Generally I find the largest cooler (30K lbs GVWR) I can and stick it in front of the radiator. Another choice (have not tried this yet) would be to add a spin-on filter after the radiator cooler and then another auxillary cooler. A transmission temp guage is also money well spent. If you can keep fluid temps below 180, the life of the fluid and transmission is greatly extended.
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2012 Chevy 2500HD, 6.0L, 6spd auto, 4x4, ECSB 1987 GMC V3500 Dump, 6.2L diesel, TH400 1983 GMC K2500 - awaiting its restoration and Cummins swap. |
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#6 |
Registered User
Join Date: Jul 2012
Location: MA
Posts: 207
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Re: Transmission woes!!!
True! Sorry - the end of that sentence shoudl read "...and has a rich history!"
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2012 Chevy 2500HD, 6.0L, 6spd auto, 4x4, ECSB 1987 GMC V3500 Dump, 6.2L diesel, TH400 1983 GMC K2500 - awaiting its restoration and Cummins swap. |
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#7 |
Registered User
Join Date: Nov 2012
Location: Newnan Georgia
Posts: 36
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Re: Transmission woes!!!
I do not hear much talk about replacement. OK by me as a rebuild may be cheaper. What is the best way to find a reputable shop as I live in a small town and not much to choose from. I do live near Atlanta but I am more about quality work and willing to drive a little bit to get it right. I plan on keeping the truck and want this past me so I can play on something more fun on the truck!
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'77 C20 Camper Special w/ 454 ![]() |
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#8 |
Registered User
Join Date: Nov 2012
Location: Newnan Georgia
Posts: 36
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Re: Transmission woes!!!
Transmission woes are behind me. I took about 2 hrs yesterday and drove the truck a mile loop and each time at starting point I crawled under truck and adjusted the pressure sensor 1/2 turn and go again. Like a light switch...I thought I would never find the sweet spot but it finally smoothed out. It shifts like a new truck! Thanks forum and peoples help, so much knowledge at my fingertips was a big help!
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