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Author Topic: TH350 to 700R4 Transmission Swap  (Read 20131 times)

Offline VeeTwin60

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TH350 to 700R4 Transmission Swap
« on: July 05, 2009, 08:40:05 pm »
Hey Guys.

I'm sorry if this has been beat to death, but I couldn't find a thread that covered the info that I am looking for, and I didn't want to hi-jack a thread.

So...

I have a 1986 C10 Custom Deluxe.  It has a TH350 (stock) transmission in it.  I would like to go to the 700R4 for the obvious benefits.  Without going into a detailed walk-through, can someone hit on the major points of what I can expect?  For example, the driveshaft, the crossmember, etc.

Also, where is the best place to get transmissions, and would I receive any credit for sending the 350 back to the vendor?
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1986 C-10 1/2 TON 2WD SWB

Offline VileZambonie

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Re: TH350 to 700R4 Transmission Swap
« Reply #1 on: July 05, 2009, 08:52:52 pm »
Well it has been discussed here 79077970987 times so a search or browse would probably reveal what you need. There would be no core obviously as it is not the same trans. Just buy a unit from summit. You will have to get a torque converter and relocate the crossmember/trans mount. Driveshaft length can easily be altered and you would need to satisfy the tcc solenoid. Go with the recommendations of the manufacturer of your trans.
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Offline SUX2BU99

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Re: TH350 to 700R4 Transmission Swap
« Reply #2 on: July 05, 2009, 09:48:18 pm »
I didn't even think of Summit when I was thinking of getting a 700R4. For what they claim (handling 450+ HP), this is one heck of a deal:

http://summitracing.com/parts/PMA-PA70102/
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85 Chevy Silverado C10 short, wide, yellow, 2wd. Lowered, 60-over 350 with Dart Iron Eagle heads and Comp Cams XE268 cam, TH350 w/ shift kit, 3.40 Gov-lok 12 bolt.

Offline VeeTwin60

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Re: TH350 to 700R4 Transmission Swap
« Reply #3 on: July 06, 2009, 05:03:05 am »
I figured it had, Vile.  I must just be using the wrong search terms. :( :-[ :-\

Is there another set of holes in the frame to accept the cross member move, or will I have to drill?
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1986 C-10 1/2 TON 2WD SWB

Offline VileZambonie

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Re: TH350 to 700R4 Transmission Swap
« Reply #4 on: July 06, 2009, 06:28:56 am »
in the search box type in "700R4 crossmember" You should see plenty of results.
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              ⌠ŻŻŻŻŻ'   [☼===☼]
              `()_);-;()_)--o--)_)

74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10

Offline Captkaos

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Re: TH350 to 700R4 Transmission Swap
« Reply #5 on: July 06, 2009, 12:23:19 pm »
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Offline VeeTwin60

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Re: TH350 to 700R4 Transmission Swap
« Reply #6 on: July 06, 2009, 04:17:20 pm »
Thanks for the replies.
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1986 C-10 1/2 TON 2WD SWB
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