350 to 700R4 conversion - Chevelle Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Feb 20th, 08, 11:43 AM
4-door Chevelle 4-door Chevelle is offline
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Join Date: Dec 2002
Location: Minnesota
Posts: 444
Default 350 to 700R4 conversion

I have a 700R4 out of a '91 Formula that I want to put in my '72 Chevelle and I have some questions:

Will the bracket Holley makes for this be enough to correct the geometry? Holley 20-121
http://store.summitracing.com/partde...5&autoview=sku

I want to use the Summit 2000 stall convertor. SUM-G2704
http://store.summitracing.com/partde...5&autoview=sku

I will be installing the B&M Transpack.
http://store.summitracing.com/partde...5&autoview=sku

I am still reviewing shifter options but may use the B&M Truck Megashifter.
http://store.summitracing.com/partde...5&autoview=sku

I have to convert the electronic speedo to gear driven but think I have that down.

It sounds like I will have to move my cross-member back and maybe drill holes in the frame to bolt it up. I assume I can use the 350 cross-member I have now. Will the current rubber/plate mount from the 350 tail-shaft mate the 700R4 to my cross-member?

Will there be any clearance issues in the tunnel?

What drive-shaft do I need to get? I do want to get a complete replacement in the event I have to quick switch back to the 350. Being I have a 4-door Chevelle that is 4 inches longer like the convertible do I still have to shorten the drive-shaft?

I am only pushing about 330HP and have 3.73 gears in the rear. I do pull a trailer on occasion as this vehicle truly is a MPV (multi-purpose-vehicle).

I hope to start on this in a couple weeks once the temp gets above zero here in Minnesota!

Thanks for taking the time to read and comment!

Darren
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1972 4-door Chevelle 350/350/3.73posi
2002 Silverado Z71
1982 Kawasaki KZ750LTD
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  #2  
Old Feb 20th, 08, 1:51 PM
twotone64 twotone64 is offline
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Rod
 
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Location: Atwater, California
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Default Re: 350 to 700R4 conversion

Quote:
Originally Posted by 4-door Chevelle View Post
IWill the bracket Holley makes for this be enough to correct the geometry? Holley 20-121
Worked for mine.



Quote:
Originally Posted by 4-door Chevelle View Post
I will be installing the B&M Transpack.
I used it in mine as well, works very well.



Quote:
Originally Posted by 4-door Chevelle View Post
It sounds like I will have to move my cross-member back and maybe drill holes in the frame to bolt it up. I assume I can use the 350 cross-member I have now. Will the current rubber/plate mount from the 350 tail-shaft mate the 700R4 to my cross-member?
Your trans mount will work for the 700 as well. All you have to do is move the cross member back, bolt it to the trans mission, and mark for your bolt holes, thats what I did anyway.

Quote:
Originally Posted by 4-door Chevelle View Post
Will there be any clearance issues in the tunnel?
I had no clearance issues at all.

Quote:
Originally Posted by 4-door Chevelle View Post
What drive-shaft do I need to get? I do want to get a complete replacement in the event I have to quick switch back to the 350. Being I have a 4-door Chevelle that is 4 inches longer like the convertible do I still have to shorten the drive-shaft?
The 700 is longer than your 350, so no matter what car it is in, your new driveline will be shorter. You will need to measure from the seal surface on the back of the tail shaft, where the yoke goes in, to the center line of the universal join hold down on the rearend. You can use some 350 yokes they are shorter, and most trans shops and drivline shops encourage you to swap to a 700 yoke. It cost me @$80 to have my driveline shortened, ballan ced, yoke swapped from the 350 to a 700 yoke, and heavy duty universal joints installed.
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  #3  
Old Feb 25th, 08, 1:12 PM
4-door Chevelle 4-door Chevelle is offline
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Default Re: 350 to 700R4 conversion

I am looking at the http://www.bowtieoverdrives.com/index.shtml TV systems. I will also have to move my drive shaft loop back. Anybody in Minnesota have a drive shaft for sale?
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1972 4-door Chevelle 350/350/3.73posi
2002 Silverado Z71
1982 Kawasaki KZ750LTD
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  #4  
Old Feb 26th, 08, 1:38 AM
esto70 esto70 is offline
 
Join Date: Nov 2007
Location: los angeles
Posts: 22
Default Re: 350 to 700R4 conversion

Yhe bowtie overdrive TV system is great. I've installed their kit on two chevelles without any problems. They also sell a trans crossmember that will bolt right in. Might as well just get your driveshaft shortened, this way you know it is balanced and all the parts are new.....hate to put that driveshaft loop to work. good luck
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  #5  
Old Apr 7th, 08, 4:52 PM
dauber65 dauber65 is offline
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Randy
 
Join Date: Jan 2007
Location: Peoria, Il
Posts: 1,244
Default Re: 350 to 700R4 conversion

I'm also going with vortec heads. I just thought of this yesterday. This is going to be a problem with my old TV and throttle brackets because they will not be able to bolt onto my old location because they are different intake bolt mounting styles. I'll have to investigate some options.
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Chevelle Tech > Mechanical > Transmission & Driveline      Current Topic: 350 to 700R4 conversion
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