700R4 Install any ideas??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Yesca 71 · 06-06-2012, 05:44 PM

I have an extra tranny lying around and i thought this might help me save some ga$. I have a 71 C20 350 and was wondering if this would work. Any help or advise would be greatly appreciated.

stomper · 06-06-2012, 06:09 PM

Yea it will work (your results may vary). I did it and it's been done and documented quite a bit by others. I searched this site and others on the web and found a wealth of info. Best advice I could give is do your research, homework, and get the TV cable right.

GMC Canuck · 06-06-2012, 08:04 PM

not sure what you have for a tranny now, but the 700r4 is a different length than the th350. You will most likely need to modify the driveshaft. A worthwhile upgrade especially if you have a working converter lock. I wired mine to lock in forth gear.

cableguy0 · 06-06-2012, 08:20 PM

If its a c20 im assuming it has either a th400 or a manual trans. If you use your truck as a truck you will regret the weaker 700r4 fairly quickly. They never put a 700r4 in a 3/4 ton from the factory for a reason.

clb1024 · 06-09-2012, 01:39 AM

Quote:

Originally Posted by cableguy0

If its a c20 im assuming it has either a th400 or a manual trans. If you use your truck as a truck you will regret the weaker 700r4 fairly quickly. They never put a 700r4 in a 3/4 ton from the factory for a reason.

My old 1986 GMC 2500 came with a 700R4 from the factory. It never gave me any problems. I used the truck to pull a 26ft 18000# trailer. The truck blow its motor before the tranny ever gave me any problems. I pulled the tranny before I sent the 86 to the crusher and will be using it in my 67 when I do my motor and frame swap.

06-06-2012, 05:44 PM	#1
Yesca 71 Registered User Join Date: Nov 2011 Location: Joplin, MO. Posts: 15	700R4 Install any ideas??? I have an extra tranny lying around and i thought this might help me save some ga$. I have a 71 C20 350 and was wondering if this would work. Any help or advise would be greatly appreciated.

06-06-2012, 06:09 PM	#2
stomper Junior Member Join Date: Jul 2002 Location: Scottsdale, AZ Posts: 1,701	Re: 700R4 Install any ideas??? Yea it will work (your results may vary). I did it and it's been done and documented quite a bit by others. I searched this site and others on the web and found a wealth of info. Best advice I could give is do your research, homework, and get the TV cable right. __________________ "I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle

06-06-2012, 08:04 PM	#3
GMC Canuck Registered User Join Date: May 2012 Location: Ingersoll, Ontario Posts: 93	Re: 700R4 Install any ideas??? not sure what you have for a tranny now, but the 700r4 is a different length than the th350. You will most likely need to modify the driveshaft. A worthwhile upgrade especially if you have a working converter lock. I wired mine to lock in forth gear.

06-06-2012, 08:20 PM	#4
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,948	Re: 700R4 Install any ideas??? If its a c20 im assuming it has either a th400 or a manual trans. If you use your truck as a truck you will regret the weaker 700r4 fairly quickly. They never put a 700r4 in a 3/4 ton from the factory for a reason. __________________ 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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