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Turbo 350 swap to 700R4


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6 replies to this topic

#1 johnnyquick

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Posted 07 April 2011 - 06:43 AM

Looking for anyone who has done this I have a Silver Anniversary car and don't want to chop it up or hack it in any way is this a swap that can/ has been done in a clean and professional manner?
I need the extra gear as these motors stock are horribly underpowered as we all know, so my thoughts are a 3.73 rear dif with the 4 speed auto to really get things moving, while retaining freeway cruising RPM's.
Thanks to all.

Edited by johnnyquick, 07 April 2011 - 06:44 AM.


#2 craig a soares

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Posted 13 April 2011 - 07:41 PM

The 700r4 was a chevy built made tranny to only bolt directly up to the sbc or bbc but ur swap can be done u would need the trans, an adjustible cross member, the same spline u joint might have to cut ur driveshaft cause i believe the 700r4 is longer then the th350 an a adapter plate so it will bolt up to ur olds block u are an u might have to change the speedo cable

#3 sixth_sense676

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Posted 13 April 2011 - 07:47 PM

http://www.transmiss...4_Swap_Info.htm

Complete Instructions. Good luck! Like to see how it turns out.
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#4 green manalishi

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Posted 13 April 2011 - 11:21 PM

:camera:

make sure to post pics of your progress

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#5 1tinindian

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Posted 14 April 2011 - 07:16 AM

Your best OD trans would be the 200-4r, as it is the same length as the TH350 which means you keep the same driveshaft, and bolts directly to the BOP engines without an adapter.

Don't over look the strength either, (Search "Art Karr") as its the same transmission used in the Buick Grand Nationals, Monte SS, and 1989 Turbo Trans Am, and are being used behind 500+ HP Pontiac strokers.

The only major mod is that the cross member needs to slide back to fit the new position.

This trans offers more frictions disc than the 700r4, which means better lock up at shift points, and has a lower first gear ratio which will aid in taking off from a dead stop.

I work for a GM dealer and the transmission guy is a personal friend of mine and he's building one of these for his 403 T/A and will be running a 3:73 rear...this is the same set-up I have planned for my 79 as well.

Leon
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#6 Erwin78ta

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Posted 14 April 2011 - 09:55 AM

I've read that to do the 200-4R swap from a TH350 you need a TH400 cross member instead. To use the TH350 cross member do you just drill new holes and slide the TH350 cross member. Do the mounting holes for the trans match the 200-4R? Also have an Olds 403 with a TH350 that we are looking to replace for the OD.

Also need to run a power line for the lock out converter. Can that be powered by a manual switch or does it need to be wired to the ignition?
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Work in progress 78 T/A
Olds 403 Automatic 87,342 miles
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79 T/A
Chevy 350
Automatic

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#7 1tinindian

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Posted 14 April 2011 - 10:06 AM

For the lock up, you need a vaccum switch.
You can use either method for the cross member.
You will also need a TV cable bracket for the carb, I got one of a mid 80 Olds 88 with a 4 bbl 307.
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