Thread: Th 350 swap
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04-14-2007 05:18 AM #1
Th 350 swap
I have a '49 chevy truck with a 75 nova subframe, sb350/th350 combo with a gm 10 bolt rear end. I want to go with an overdrive trans like a th700-r4. My questions are, besides moving the trans mount back, what other modifications will be required? Are they the same length or will I have to shorten the drive shaft? Will the shift linkage match up? Any other considerations?
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04-14-2007 08:18 AM #2
i think you will have to shorten the drive shaft, also you will need a shifter with an overdrive position.
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04-14-2007 02:02 PM #3
The 2004r is the same length as the th350 but you still have to move the cross member back 6".
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04-15-2007 07:18 AM #4
you did noy say which 350 you have a short shaft is 3 3/16 shorter than a700 mid lenght is almost same The shift linkage is same spot cooling lines same you must lock-up the torque converter when the truck is in 4th gear or it will over heat If you use a 700 from a fuel injected car or truck You can wire the lock-up out side the trans if it has a normally open 4th gear switch. You need an ohm meter there is a wire harness on the trans the rear wire should ohm out as an open curcuit if not you need to change the 4th gear switch to a normally open one If it is an open switch you need to put a 12 volt sorse to the front outer wire and connect the front inner wire to the rear wire all done with just a butt connector . locks up 4th gear only .The crossmember will have to be moved back 2 in. unless your subframe has holes to align subframe to a 400 trans then you can use a 700 tailshaft housing that has a boss for a trans mount and it will bolt right up. You also must run a t v cable to control the shifts
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