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Username Post: Couple Questions From A Newbie - 1980 C10        (Topic#356906)
Posts: 5
Age: 19
Loc: WA
Reg: 06-18-19
06-20-19 11:53 PM - Post#2768919    

OK so I'm still fairly new to the whole mechanics thing, trying to figure things out as a I go here, but am a quick study. Late October of last year was gifted a 1980 Chevy C10 with a 250(4.1) straight 6 block, with the "California crap"😄 emissions system and a 3 on the tree manual transmission, 74k miles all original.

Recently done some basic work on it, radiator, water pump, rotor, distributor cap, plugs & wires, oil & gas filters, battery, radiator & heater hoses, belts, and a few other things. Next up I'm getting ready for some bigger projects. First thing is swapping the current (super obnoxious royal pain I will add) transmission for a the TH350 automatic transmission, then later swap the 250 six block for 350 V8 block, probably the 4 barrel, with regular emissions for better performance. Now from what I have found the 194,230,250,292 6 engines all have the same bolting pattern as a Chev V8 engines and can be bolted to any Chev V8 transmission. Powerglide, turbo 350/400, 2004R/700R4 O/D's with a combination of stock parts, so I don't need an adapter or anything like that.

Now what I can't figure out is that there was a TH350c transmission that existed in the early 1980's that had a lock up torque converter. I am having a hard time telling which of the 350 models I need, but that I need to figure out because parts like the converter apparently aren't interchangeable. I guess the C model was not as desired as the original. Could someone please help me out with this?

I'm also wanting to go with something of a personal touch and get a horseshoe style shifter assembly like was used in the Camaro. I found this one that says it is compatible with the TH350/400 transmission, because it does use the detent cable. So even though it is made for a 67-69 Camaro if I built the console would this still work for my C10?

Edited by Reuland80C10 on 06-21-19 12:06 AM. Reason for edit: No reason given.

Liberty Valance 
Posts: 116
Liberty Valance
Loc: Euless,Texas
Reg: 07-21-14
06-21-19 04:18 AM - Post#2768922    
    In response to Reuland80C10

Welcome to the site.

1974 Cheyenne 10 LWB 350/TH350/AC/4 BBL Quadrajet
Mopar by Birth
Chevy by Choice

Senior Chevytalk Moderator
Posts: 24929
Loc: Austin, TX 78748
Reg: 05-09-00
06-23-19 06:51 AM - Post#2769045    
    In response to Liberty Valance

Welcome to the site. I guess you have ruled out overdrive. The TH350C started in '79. The electronic lock up increased fuel efficiency by 10%. You can ID one by an electrical plug on the left side. A standard TH350 will not have an electric plus. (Read about it here: ns... You can add a plug though. It used a vacuum operated switch to lock the converter at highway speeds. A stall converter can do the same job. My suggestion is to do an engine and trans swap at the same time. If you remove the radiator support, you can install an engine/trans combo all in one time. I did it to mine. I recommend a combo install so you can match a converter stall speed to engine power. I removed the 700R4 electrical lock up on my truck. I run a 2500 stall converter to match a 355 HP/405 ft/lb torque motor. The converter locks up in overdrive. Running in 3rd or standard drive, it locks up too. It's like having a middle gear between D and OD.

As for the shifter, it can work. Checkout this custom center console for a shifter. onsole.h...

LS 4.8, 5.3, and 6.0 engines can run on carbs too. They bolt right up a TH350 too. If I did my truck all over again. I would do a 6.0 carb swap.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles

Edited by gchemist on 06-23-19 06:53 AM. Reason for edit: No reason given.

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