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Best Automatic tranny for high hp?

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Old Apr 18, 2002 | 01:38 AM
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Default Best Automatic tranny for high hp?

I was thinking that if i get over 400hp and more torque than i could handle with a 383 and a SR, that the 86's 700R4 would fail fairly quickly.

so what should i think about having done to it, beefed up with new TC and cooler (ill get those 2 either way) or a whole new transmission and if so what kind?

thanks
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Old Apr 18, 2002 | 01:56 AM
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Default Re: Best Automatic tranny for high hp? (vader86)

or would it be better for me to think of a 6speed tranny? or is there a 5 speed transmission that will fit?
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Old Apr 18, 2002 | 05:35 PM
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Default Re: Best Automatic tranny for high hp? (vader86)

anybody?
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Old Apr 18, 2002 | 06:07 PM
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Default Re: Best Automatic tranny for high hp? (vader86)

It all depends you you want from the car and how much money you have to spend.
I would think that 700r4 would be OK with only 400rwhp.
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Old Apr 18, 2002 | 06:23 PM
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Default Re: Best Automatic tranny for high hp? (vader86)

$$$?

The TH700 is a nice transmission, for the $$$. Just about as economical as you can go with an overdrive.
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Old Apr 18, 2002 | 06:51 PM
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Default Re: Best Automatic tranny for high hp? (vader86)

When you get over 600-700 HP, 2 speed Powerglide!
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Old Apr 18, 2002 | 10:17 PM
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Default Re: Best Automatic tranny for high hp? (mackeyred96)

It all depends you you want from the car and how much money you have to spend.
I would think that 700r4 would be OK with only 400rwhp.
well its the torque that worries me, my final goal is at least 450 TQ at the flywheel but i think ive seen a few with over 500TQ out of the AFR/383/SR setup. Treat this as if money wasnt a sticking point
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Old Apr 18, 2002 | 10:21 PM
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Default Re: Best Automatic tranny for high hp? (vader86)

Treat this as if money wasnt a sticking point
I'd talk to Level 10 transmissions in NJ and see if you like what they say.
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Old Apr 19, 2002 | 06:02 AM
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Default Re: Best Automatic tranny for high hp? (vader86)

If money is not a considering point, be the first person to mount an Allison 5-speed auto in there. :yesnod: Take lots of pics so I can do it after you're done. :yesnod: :yesnod: :yesnod:

I'm assuming if you're installing a super-ram, you want to stay streetable, how about a built TH350 with lock-up?
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Old Apr 19, 2002 | 06:36 AM
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Default Re: Best Automatic tranny for high hp? (vader86)

Some people have installed a 4L80E. It is larger but can fit in a C-4 and will survive behind a stout big block. What ever you do to a TH700 or 4L60E, they will not hold up beyond a certain point.
At the power levels you are considering a built TH700 or 4L60E would work.
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