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#1 |
Member
Join Date: Dec 2015
Location: Bowling green, Ky
Posts: 211
Likes: 12
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I have a Turbo 400 manual valve body transmission with a Trans Brake. My problem is that when I release the thumb switch that is connected to the trans brake solenoid, there is a .5 to .75 second delay before the car actually moves. The switch is not hooked up to any delay box, it is wired directly to the trans brake solenoid. I tried activating the switch with the engine not running but with the electrical power on, and I can hear the solenoid does release as soon as I let go of the switch. Any ideas as to why this is happening?
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#2 |
Junior Member
Join Date: May 2010
Location: Massachusets
Posts: 91
Likes: 0
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Unfortunately, the TH400 release is slow with the cast iron valve bodies due to the passage lengths the fluid has to go through. You should be able to leave good with a .500 tree though. The new CNC machined aluminum valve bodies are much quicker since they reroute the passages and other upgrades with internal solenoids. I race a TH400 in SG and have a Griner Valve body which was one of the first to offer machined aluminum and is the only way to go with a .400 tree. Still not as fast as a poweglide but some of that may be the car set up.
Bob |
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#3 |
VIP Member
Join Date: Jan 2003
Location: Allentown,PA
Posts: 2,438
Likes: 787
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is that a typo, .5 to .75 and not .05 to .075?
All TH400 valvebodies that use the modulator valve are notoriously slow and can be effected by a binding release valve. If you are serious about racing on a Pro tree with a 400 , or even just being consistant on the full tree , the Griner brake is the ONLY choice. I've used and sold them for at least 25 years and there is none better. Plus the normal 4-500 RPM lag on the 1-2 shift is gone ,the shift is instant.
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Tom Goldman 1500 SG , 1506 STK |
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