700r4
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Joined: Apr 2003
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From: Amarillo, TX
700r4
How much power can a 700R4 transmission handle? I'm about to put a new engine in my 89 IROC and I'm trying to figure out if I should put in a TH350 while I'm at it. Basically its a stock GM crate motor bottom end with Vortech heads, intake, stock TPI, and a GM cam- .434-.460 lift. Will the 700R4 be alright? Thanks for any help.
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From: Virginia Beach
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Joined: Jul 2000
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From: South Louisiana
I have the GM 350 HO crate (vortech) and it basically scrambled my 180,000 mile 700r4. Got it rebuilt and it takes the shifts great!!!! The only problem I have is the need for sub frame connectors (first to second rolls the body) to stiffen the "non horsepower" motor 
Later
It is not the horsepower that kills your tranny...IT IS THE TORQUE!!!!!!
Later
Later
It is not the horsepower that kills your tranny...IT IS THE TORQUE!!!!!!
Later
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Joined: Jan 2001
Posts: 1,790
From: Florida. USA
Originally posted by 1fastformula
I have the GM 350 HO crate (vortech) and it basically scrambled my 180,000 mile 700r4. Got it rebuilt and it takes the shifts great!!!! The only problem I have is the need for sub frame connectors (first to second rolls the body) to stiffen the "non horsepower" motor
Later
It is not the horsepower that kills your tranny...IT IS THE TORQUE!!!!!!
Later
I have the GM 350 HO crate (vortech) and it basically scrambled my 180,000 mile 700r4. Got it rebuilt and it takes the shifts great!!!! The only problem I have is the need for sub frame connectors (first to second rolls the body) to stiffen the "non horsepower" motor
Later
It is not the horsepower that kills your tranny...IT IS THE TORQUE!!!!!!
Later
And again more abuse with a New Engine and old 700R4 do not make a happy combo.
I am using a 700R4 with half the miles and new 350 with no problems.
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Joined: Jul 2000
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From: South Louisiana
Originally posted by 87DJP2001
Yes, a 700R4 with 180,000 abused miles on it will Not hold up with a new engine. And again more abuse with a New Engine and old 700R4 do not make a happy combo.
I am using a 700R4 with half the miles and new 350 with no problems.
Yes, a 700R4 with 180,000 abused miles on it will Not hold up with a new engine.
And again more abuse with a New Engine and old 700R4 do not make a happy combo. I am using a 700R4 with half the miles and new 350 with no problems.
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Joined: Apr 2003
Posts: 9
From: Amarillo, TX
Thanks guys. I figured it would probably hold up but I wasn't sure. The motor I'm building is basically the GM 350 H.O. motor, I bought the exact cam from that motor and the heads are the same, the only difference is I'm putting roller-tip rockers on mine (big difference). My trannie already has a shift kit too. Thanks again.
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Joined: Oct 2002
Posts: 1,867
From: Drexel Hill, Pa
Originally posted by Greed4Speed
I'll put it this way. I've seen several big blocks w/nicely built 700R4s behind them with no probs, and those engines were making much more torque than a GM 350 HO.
I'll put it this way. I've seen several big blocks w/nicely built 700R4s behind them with no probs, and those engines were making much more torque than a GM 350 HO.
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