Transmissions and Drivetrain Need help with your trans? Problems with your axle?

What upgrades and mods for a 700R4 behind a 325hp 350?

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Old Dec 17, 2020 | 05:22 PM
  #1  
tater's Avatar
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From: Altus, Oklahoma
Car: Dad's 87 Bird (Org Owner)
Engine: Vortec 350 Crate Motor
Transmission: TH350
Axle/Gears: 3.42 Posi
What upgrades and mods for a 700R4 behind a 325hp 350?

I have searched.

As a minimum, what is recommended as an upgrade and modification for these transmissions? It is just behind a mild small block.

Thanks.
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Old Dec 17, 2020 | 06:27 PM
  #2  
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Re: What upgrades and mods for a 700R4 behind a 325hp 350?

With a 3.42 axle ratio, I'd get a 2500 rpm converter in there. You'll likely end up at around 2200 with the torque from that engine, which should be perfect. It'll drive like stock until you nail the gas.
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Old Dec 18, 2020 | 04:25 AM
  #3  
84 z28's Avatar
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From: Rochester NY
Car: 1984 z28
Engine: 355
Transmission: 700r4
Axle/Gears: Moser 9" 4.11
Re: What upgrades and mods for a 700R4 behind a 325hp 350?

Taking the torque arm off the tail shaft doesnt hurt

Originally Posted by tater
I have searched.

As a minimum, what is recommended as an upgrade and modification for these transmissions? It is just behind a mild small block.

Thanks.
Reply
Old Dec 18, 2020 | 07:29 AM
  #4  
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From: Arcadia, OK
Car: 1990 Pontiac Firebird Formula
Engine: L31 350 TPI
Transmission: Tremec TKX
Axle/Gears: 3.23 Posi
Re: What upgrades and mods for a 700R4 behind a 325hp 350?

Corvette servo. Made a HUGE improvement to mine.
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Old Dec 18, 2020 | 10:39 AM
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Re: What upgrades and mods for a 700R4 behind a 325hp 350?

As long as the transmission still in working order. The Street/Strip TransGo Modified Shift kit will give you everything you want here. The 12" diameter 2,400 - 2,500 rpm stall torque converter from Edge would be the one to use here. If you drive aggressive to very aggressive, then you would want the 9.5" diameter torque converter, with a 2,400 to 2,800 rpm stall from Edge. They both come with a two year warranty. Depending on how you drive, what the stall and diameter of the torque converter is, and the rear end gear ratio, is how I set these kits up to be smooth at part throttle, and the shifts getting quicker and firmer with more throttle. This kit has the ability to hold any gear to any rpm. Or just leave in overdrive or drive and go. Very user friendly. The kit comes with the Corvette servo, larger boost valves, late 1993 design pressure regulator valve, pre-drilled separator plate, new second accumulator housing with hardened pin, Torlon checkballs, etc. Let me know if I can be of help here.

Last edited by Pro Built Automatics; Dec 18, 2020 at 10:43 AM.
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Old Dec 25, 2020 | 10:52 AM
  #6  
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Joined: Jun 2002
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From: Altus, Oklahoma
Car: Dad's 87 Bird (Org Owner)
Engine: Vortec 350 Crate Motor
Transmission: TH350
Axle/Gears: 3.42 Posi
Re: What upgrades and mods for a 700R4 behind a 325hp 350?

Pro-Built, do you sell complete transmissions are just rebuild kits?
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Old Dec 25, 2020 | 03:21 PM
  #7  
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From: Midland, Michigan
Car: 1989 IROC
Engine: 350
Transmission: 700R4
Axle/Gears: 3:42
Re: What upgrades and mods for a 700R4 behind a 325hp 350?

Probuilt what is your thought on the gearset change to better improve 1st to 2nd drop that the factory gearset has.

https://transmissioncenter.net/shop/...t-carrier-kit/
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