T-350 to 700r4 swap? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-23-2004, 11:52 AM
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T-350 to 700r4 swap?

I have been researching this but I have a question just to make sure. My ride-- 76 chevy c10, 2wd, th350 with a 9 inch tail shaft. I have looked on the web and have found that the 700r4 is 3 inched longer than the th350 with a 6 inch tail. Well my th350 has a 9 inch tail so that makes up for the 3 inches in length, right. Has anyone switched to a 700 r4 from a th350 with a 9 inch tail before. I know the cross member will need worked on, but what else will need done to make it fit.

I am not going to outpower the 700r4 for some time, but I will be driving the truck for long distances.

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Old 08-23-2004, 03:56 PM
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I changed the th350 out of my s-15 to a 700R4. I don't know if you can get away with the same drive shaft. I shortened the shaft to fit (should probably get it professionally done). Or walk around the scrap yard with a measuring tape and find one to fit if there is one.

Make absolutely sure that when you put in the 700 that it is centred in one plane with the rear axle or you'll be blowing U joints like no tomorrow. U joints can only take motion in one plane not two.

You'll have to add a vacuum switch and wiring harness for the TCC (lock up torque converter). Just get it off what ever the donor vehicle is. Don't skip this step the lock up saves a lot of gas.

The modulator valve vacuum hose could be eliminated.
There should already be a provision on the carb for the TV cable, but I'm not sure if it will be an exact replacement or if you'll have to modify it a bit or get a part from another carb that has the same TV cable fitting.

Consider your shifter and linkage, you might want to change the column or go to a floor shift. Try it out, you might get away with what you have with a little modification.

Keep the filler tube, it might be a perfect fit for the 700.

Finally, the speedo cable. The plastic gears might have to be changed to give you a more accurate reading.

If you are getting a second hand 700 change the filter and consider buying a new torque converter, there's a lot of filings in old converters.
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Old 08-24-2004, 02:32 PM
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Old 08-24-2004, 07:53 PM
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It is a common bolt in to replace the 9 inch tail t-350 tranny.

Make sure you have the TV cable for the 700 hooked up correctly. The lock up needs to be addresssed with a lock up kit or something else so the converter does lock up in OD at minimum.

Cross member should slide back , may need to drill some holes.

Cooler lines will bolt up to the 700 tranny.

Drive shaft yoke is same splines for each tranny.

Speed-O gear ratio may need some changes on the 700 to have a correct reading speed-o - meter

Shifter linkage should bolt right up . may need to move shifter arm from T-350 tranny to the 700 tranny. 700 tranny is ALL metric , ALL bolt , nuts and bolt holes are metric!
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Old 08-25-2004, 09:17 AM
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Update:::::: Because of time and money constraints I have decided to go with a rebuild of my existing th350. Thanks for the replies to my question.
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Old 08-25-2004, 09:21 AM
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when built correctly the t-350 is very tough tranny
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Old 09-23-2005, 09:19 PM
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I must say, im already really impressed with this message boards...ive been considering a th350 -700r4 swap for some time now...i want my truck to run a mild 350, with a 700 od, 3.73 posi. my intentions are to have a daily driver, with gas mileage and torque. Would the 700r4 make a signifagent differnce in torque/gas mileage? Could my th350 be rebuilt to perform as good for much less $$$ ? id appreciate any and all info u can throw at me

Justin

i guess i forgot to mention im rockin an 84 silverado. ill have pics and info up sometime soon.
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