350 and 200r4 swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

pestwagon · 04-22-2017, 05:58 AM

Not all TH350s are the same. I did a TH350 to 200R4 swap. Driveline had to be shortened as the TH350 was longer. Check length of your TH350 first, compare that to the 200R4.

Oh and yes its really worth it. I used a switch activated by the brake pedal to turn off the torque convertor lock up feature. It locks up at around 40 mph.

Adjust the cable correctly to shift nicely. Mileage went from 9-10 mpg with 3.73 posi gears to 14-15 mpg.

04-22-2017, 05:58 AM	#3
pestwagon Registered User Join Date: Feb 2010 Location: Los Banos, CA Posts: 390	Re: 350 and 200r4 swap Not all TH350s are the same. I did a TH350 to 200R4 swap. Driveline had to be shortened as the TH350 was longer. Check length of your TH350 first, compare that to the 200R4. Oh and yes its really worth it. I used a switch activated by the brake pedal to turn off the torque convertor lock up feature. It locks up at around 40 mph. Adjust the cable correctly to shift nicely. Mileage went from 9-10 mpg with 3.73 posi gears to 14-15 mpg.



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