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

.500 Boost Valve ?

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Old Mar 5, 2004 | 08:18 PM
  #1  
91GTABird's Avatar
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From: Memphis, Tn
Car: 92' RS
Engine: 357
Transmission: TH350
Axle/Gears: 4.10
.500 Boost Valve ?

Whats a Boost Valve? Whats the difference in a .500 Boost Valve and any others?
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Old Mar 6, 2004 | 01:28 AM
  #2  
HPP4mula350's Avatar
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The .500 boost valve is a transmission mod that lets you hit OD at WOT. Lots of fun!!!!!
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Old Mar 6, 2004 | 09:07 AM
  #3  
91GTABird's Avatar
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From: Memphis, Tn
Car: 92' RS
Engine: 357
Transmission: TH350
Axle/Gears: 4.10
Whats involved in installing it myself? Whats the difference in a .500 boost vlave and another size like .420 boost vlave?
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Old Mar 6, 2004 | 11:47 AM
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HPP4mula350's Avatar
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i had mine put in while i had the trans rebuilt, but i believe it is fairly simple, going into the throttle valve on the trans. The .500 boost valve is bigger than the .420, requiring more fluid pressure for the trans to downshift. It does affect the downshift points slightly, but once you get used to it, its no big deal, especially with lower gears.
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Old Mar 7, 2004 | 03:41 PM
  #5  
PLANT PROTECTION's Avatar
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From: La Porte, IN
Car: 1987 Monte Carlo SS
Engine: L98
Transmission: 200-4R
Axle/Gears: 7.625 10 bolt/3.73s
Originally posted by HPP4mula350
The .500 boost valve is a transmission mod that lets you hit OD at WOT. Lots of fun!!!!!
The .500 boost valve will not let you hit 4th at WOT. The bigger boost valve increases transmission line pressure which firms up shifts.
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Old Mar 7, 2004 | 05:58 PM
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Car: 91 Z28
Plant Protection is right it has nothing to do with WOT 4th gear. I think HPP4mula350 is thinking of the valve that goes in the valve body. the .500 boost vavle installs in the pump assembly.
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