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Old 04-13-2002, 03:57 PM
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Post 700 r4 vs 400 turbo?

Hello, this is my first post here, I have a 71 chevy pickup with a nice and stout 350 runs great no complaints don't think anything special about the HP.

Behind it is currently a 400 turbo transmission that leaks like a sive! It has a shift kit in it and when it has full fluid it chirps in 2nd gear just fine at about 4500 rpm.

I am considering putting in a 700R4 so I can have some highway mileage out of it right now it can get 14mpg doing 60-65 down the road but thought I might be able to get at least 18 with overdrive.

I talked to the tranny shop they said $400 to take out the 400 and go through it and rebuild and reseal and put back in or $650 to put in a 700R4 with me comming up with a drive shaft and trying to figure out a lock up. I've been told the drive shafts can be made in Springfield Missouri for about $65.

The tranny shop all but cussed the 700R4 though said it might last a year then I'd want it pulled out.

Is it a good tranny? what year tranny do I want? How do I go about locking them up? and what are corvet servos?

thanks for your patience of reading all this and answering.

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Old 04-13-2002, 06:43 PM
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the 700r is a good trans, many streetrodders use them, if they are built right, they will hold up to 450 hp, the 400 is a tougher trans and can be built to almost any hp you can come up with, I would look for another trans shop if I were you...*S*
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Old 04-16-2002, 01:48 PM
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This is a site that I found a few years ago. I have not had the need for a 700r4 yet but this shop appears to have a good product.

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Old 04-23-2002, 08:05 AM
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The 700R4 is a good transmission, and is easily hooked up to lock the converter. It will support a lot of HP if setup correctly - and this means being sure the throttle hookup is exact - the pressure levels are critical. It is easy to do - go visit the following site for all the info you need:
<a href="http://www.700R4.com," target="_blank">www.700R4.com,</a> or <a href="http://www.bowtieoverdrives.com." target="_blank">www.bowtieoverdrives.com.</a> Steve Holmes can help you with every step -they are great folks. I hooked up one to my 40 Chevy with ZZ4 block, turning abotu 400HP and it is great. I have a 3:23 Camaro IROC posi rear in it and get 20mpg over the highway, 16-18 around town. Best yet - it turns 1700 rpm at 60mph - very cool, very quiet. 700R4s need to be set up - your shop probably doesn't know all that has to be done, otherwise they'd know how to hook you up with a lock up switch. Go see Bowtie OD and good luck!
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