1987 C10 700r4 to th350 trans conversion - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-12-2011, 12:53 AM
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1987 C10 700r4 to th350 trans conversion

I have a 1987 Chevy C10 pickup and the original 700r4 transmission completely went out it doesn't even move anymore. I have a rebuilt th350 in my shed and was wanting to know what all would i have to do to put the th350 in my truck and what torque converter to use. My main concern is hooking the speedometer up, and hooking the torque converter up to the factory flexplate (I don't know if they have the same bolt hole pattern size) any help would be awesome.
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Old 03-12-2011, 05:15 AM
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Flexplate's mounting pattern for the TC shouldn't be a problem.
If your TH350 has a 9" Tailhousing it will be the same length as the 700R4 and not require a longer Driveshaft.
Speedo cable should connect without a problem.
You'll need a Detent cable for passing gear, and a Vacuum line for the TH350's Modulator.
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Old 03-12-2011, 06:41 AM
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That's exactly what I was wanting to here thanks for the help
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Old 03-12-2011, 06:59 PM
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Should swap out pretty easily, but I wouldn't swap a 700r4 for a 350 unless it was built for performance only and not for street use. Even then the 700r4 has a nice first gear. You'll probably lose several mpg on the highway with a 350.
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Old 03-12-2011, 10:04 PM
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Quote:
Originally Posted by Torque454
Should swap out pretty easily, but I wouldn't swap a 700r4 for a 350 unless it was built for performance only and not for street use. Even then the 700r4 has a nice first gear. You'll probably lose several mpg on the highway with a 350.
The th350 is built for a street/strip setup, I am not woried about the mpg I am just going to put the 350 in it because I already have it and the 700r4 burnt up (don't have money for a rebuild)
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Old 03-13-2011, 01:15 AM
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The trans mount is also in a different location. However, you should be able to slide the crossmember forward, and redrill mounting holes (they may even already be there). Went through this in 84 with an 82 Silverado, that had 16K on it when the 700R4 went out. No one could rebuild the 700R4, or at least do it quickly, so a 9" extension housing TH350 was backdated into the truck (we were on the road cross country). The trans shop that did the work jerry rigged a "mounting plate" to space the mount accordingly, rather than just move the crossmember. GM paid for 85% of the swap due to the truck being under warranty. I redid the crossmember after getting home.
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