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Old 04-13-2002, 04:59 PM
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Post 7ooR4 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 04-14-2002, 10:16 PM
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Go for the 700r4 trans not only does it have overdrive but it has a lower first gear. Just make sure that it is newer then 1987. Pre 87 units were not all that good.As far as the converter lock up You can go to the how to section on this board and it will tell you how. ROY
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Old 04-15-2002, 03:32 PM
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Before you pull the box out try a bottle of Slich 50 tranny aditive. My buddy has a 86 Vette with a 700-R4 that was leaking like a sive and shifting terribly. He put some in and it stopped leaking and shifts great.This may buy you some time to shop for the right set up for your truck. The 700-R4 is a great box and can be built to take about anything your truck will give it. A major factor is putting the right stall converter in also. Check with the speed shops, Summit Tech line etc.Good luck.
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Old 04-25-2002, 11:32 AM
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You may even want to try a 200r4
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Old 04-25-2002, 02:54 PM
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no 200r4's for me, went through too many of those in an old station wagon dad had

I'm still up in the air on this one...

drove it last night 162 miles to another town and back and got 15.53 mpg and I wasn't at all nice to it, lost of stop and go and spin and win!
(silly toyota's don't mess with a chevy)

That was also doing 65 on highway at 2400-2500rpm
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