Modifying Your 1970 Chevy C10 For Performance? Don’t Forget About The TH350 Transmission

Posted by on Monday, January 19th, 2015

The Th350 is a three-speed automatic transmission built by General Motors for use in their many car and truck divisions. It was first put into production in 1969 and lasted through most of the 1980 production year. It was eventually replaced by the TH350C, which was basically the same transmission as the Th350 with the addition of a lockup torque converter.  The TH350 is equipped with a 2.52:1 first great ratio, which is not great for better performance takeoff nor for gas mileage.  Third gear is the standard 1:1 ration.  The Th350 was a widely used transmission, and could be found in cars like the Caprice, the Camaro, the Corvette, the Cutlass, the Nova, the GTO and the Chevy full size van. It was also available as an option in the Chevrolet C10 pickup truck.

Chevy C10

Image from WIkimedia Commons

The Chevy C10 is a popular pickup truck made by Chevrolet. It was available in a short or long bed version, and came with a number of different cab configurations. Four wheel drive was also an [popular option.  The second generation C10 was built between 1967 and 1972. They have a very cool, retro look that is popular with hot rods.  The 1970 model is especially desirable.  These trucks are often fitted with more powerful and modern V8 engines, lowered high performance suspensions and killer interior. Unfortunately the TH350 transmission is often overlooked. Here are a couple things you can do to the Th350 automatic transmission in your 1970 C10 that will bring its level of performance up to par with the rest of your modified truck.

Start off with a total transmission performance rebuild. The rebuilt should include performance bands and clutches, high performance planetary gears, a modified valve body (with a shift kit), strengthened input and output shafts, a modified front pump assembly and high performance seals.  If you are unable to perform the performance rebuild yourself, I high recommend that you look at a company that specializes in performance transmissions, such as ETE Reman.  They can build the transmission to your exact specs and delivered it your door ready to install. The best part is that the transmission is fully tested and should go in without a hitch.

Next on your list should be the installation of a performance torque converter. While the stock torque converter is designed to stall around 1500 rpm’s, I recommend swapping out a performance torque converter with a stall speed around 2100 rpm’s. This will give you better off the line performance without sacrificing gas mileage.  Look for a torque converter that comes with special performance upgrades, like a furnace brazed impeller and turbine fins, hardened drive tube and anti-balloon plates.

Hot-rodders care about two things: looks and performance. The Chevy C10 is a sharp-looking ride that is going to get approving stares and nods of admiration at any car show or on the street, but without a rebuild you’re going to being passed up by some of the more boring cars on the road. Don’t let a substandard transmission keep you back.

If you’re looking for a quality remanufactured transmission, then you won’t do better than ETE REMAN. That’s why we offer a three-year/unlimited mileage warranty on all our products. Browse our online catalog and contact us today.

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