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06-16-2021, 12:02 PM | #1 |
Registered User
Join Date: Feb 2017
Location: S.E. Arizona
Posts: 52
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700R4 and TH350 internal parts interchange?
I'm planning to build a TH350 (probably a TH350C) for my 69 C10 and installing a Gear Vendors OD. I currently have a greasy 700R4 from an 88 G-van sitting in the shed, *supposedly* a good used unit. Would it be worth tearing into it to steal any upgrade parts to put in my TH350? I've heard about using a center support from a 700r4 in a TH350 for the wider sprag clutch, are there any other parts worth swapping or would I be better of just selling it as a whole unit and buying new upgrade parts? The truck is a mostly stock 350 and I'm going for just a rock solid daily driver trans, maybe occasional towing and a yearly burnout.
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06-16-2021, 04:30 PM | #2 |
Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,389
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Re: 700R4 and TH350 internal parts interchange?
As far as I know the only thing in common is the spline count on the output shaft. If you are wanting to build a 350c then you need that specific 350 case.
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06-17-2021, 06:08 AM | #3 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: 700R4 and TH350 internal parts interchange?
The low roller clutch and support is wider and does interchange. But I wouldn't tear a unit down to scavenge the part. It takes quite a bit of abuse to make the stock piece fail even in a TH350. Usually the splines in the case fail before the roller clutch.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
06-17-2021, 08:15 AM | #4 |
Registered User
Join Date: Sep 2018
Location: Moss Bluff, LA
Posts: 381
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Re: 700R4 and TH350 internal parts interchange?
why not save some cash and build the 700 ???
you can run a pressure switch fully internal to the 700 to control lock up... my fully swapped 89 (no factory electronics left) works just fine |
06-17-2021, 01:32 PM | #5 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,692
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Re: 700R4 and TH350 internal parts interchange?
Sounds like a like of work for a mostly stock 350 that won't be beat on or drag raced with sticky tires. A stock th350 will handle that.
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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