700r4 swap into 1970c-20 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

olyeller70 · 08-21-2009, 09:00 PM

I have looked on this site and also went to the Custom Classic Trucks website. LIsted is what was not clear to me:
Have one of you put a 700r4 into one of these trucks? Did you have to move the shifter to the floor? Are the mount issues? Are the diveshaft issues?
My current tranny is a 350 with the long tailshaft. Would like to do this to get he overdrive=gas mileage.

72freak · 08-21-2009, 09:26 PM

Quote:

Originally Posted by olyeller70

I have looked on this site and also went to the Custom Classic Trucks website. LIsted is what was not clear to me:
Have one of you put a 700r4 into one of these trucks? Did you have to move the shifter to the floor? Are the mount issues? Are the diveshaft issues?
My current tranny is a 350 with the long tailshaft. Would like to do this to get he overdrive=gas mileage.

shifter linkage works fine, trans cross member will have to be moved a little bit and you will have to have your driveshaft altered.

cableguy0 · 08-21-2009, 10:41 PM

if your th350 is a 9 inch tail its almost a direct swap just have to move the crossmember a bit and the d shaft will work. the shift linkage will work but with the stock linkage you wont be able to manually put the transmission in 1st gear. just measure the tailshaft bc there are 3 different lengths for th350 6,9 and 12

08-21-2009, 09:00 PM	#1
olyeller70 Registered User Join Date: Feb 2007 Location: Atlanta Posts: 51	700r4 swap into 1970c-20 I have looked on this site and also went to the Custom Classic Trucks website. LIsted is what was not clear to me: Have one of you put a 700r4 into one of these trucks? Did you have to move the shifter to the floor? Are the mount issues? Are the diveshaft issues? My current tranny is a 350 with the long tailshaft. Would like to do this to get he overdrive=gas mileage. __________________ Thanks, Mike Last edited by olyeller70; 08-21-2009 at 09:01 PM. Reason: oops

08-21-2009, 10:41 PM	#3
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: 700r4 swap into 1970c-20 if your th350 is a 9 inch tail its almost a direct swap just have to move the crossmember a bit and the d shaft will work. the shift linkage will work but with the stock linkage you wont be able to manually put the transmission in 1st gear. just measure the tailshaft bc there are 3 different lengths for th350 6,9 and 12 __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.



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