700r4 trans Lock up when cold - Hot Rod Forum : Hotrodders Bulletin Board
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Old 07-25-2010, 07:20 PM
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700r4 trans Lock up when cold

Hello all, first post, found lots of good info for my 700r swap here. Thanks, problem I'm having is the converter goes to lockup until it's up to operating temp even with the power removed from the sol. It has a TCI constant pressure vb and TCI lockup kit. Works great after warm up just not sure where to start. Thanks, Chris

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Old 07-25-2010, 11:04 PM
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Which gear positions does this happen in?
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Old 07-26-2010, 05:24 PM
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It happens in any position, first, reverse, any. Thanks for the reply.
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Old 07-27-2010, 12:06 PM
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The Converter clutch oil circuit normally receives pressure only in 2nd, 3rd & 4th gear. Sounds like you have a crossleak from somewhere. Possibly the Valvebody gaskets. Or Converter Clutch Apply valve above the Solenoid is stuck.
Maybe Crosely will know more or if I'm on the right track.
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Old 07-27-2010, 04:46 PM
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Thanks, I bought this used from a guy. I did get to ride in the car before he pulled it and he has it set on kill for the shifts. I would like to back it down but would only like to pull the pan once if possible. Again thanks for the reply.
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Old 07-27-2010, 05:03 PM
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Dual Pressure Valve Body

Backing the shift firmness down with the Constant Pressure Valvebody can be a problem. The CP valvebody eliminates the TV valves control of pressure. So the only way to change shift feel is by installing a weaker Pump pressure regulator spring and smaller TV & Low/Reverse Boost valves. Smaller orifice holes in the VB seperator plate also but, it would take a lot of testing/tuning.

Lonnie @ExtremeAutomatics developed a Dual Pressure Valve Body for the 2004R which is a much better idea. 1st, 2nd & 3rd gear position has constant high pressure. 4th gear position has normal/variable TV operation. I'm sure he could make these for the 700R4 also.

Info>> http://www.turbobuick.com/forums/tra...alve-body.html
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Old 07-27-2010, 05:14 PM
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It's mostly 1-2 that is too hard. Can't shift without a bark at any speed. Other than the cold lock up this trans is worlds above the 350 that I had in it for long hauls. I'm sure I'll find the cure here. Thanks again.
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Old 07-27-2010, 05:35 PM
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The main complaint with the CP Vbody is no TV pressure control with part throttle shifts. It's high Pr. all the time. It could bite you if you try to reduce 1st-2nd shift firmness with a smoked/burnt 2/4 band at heavy throttle.
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Old 07-27-2010, 05:38 PM
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If that TC clutch is locked up all the time, it will also make the shifts super hard. Forgot about that. A Converter with a higher stall rating will also smooth out shift firmness.
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Old 07-27-2010, 05:42 PM
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I do have the stock vb and parts. The converter is aftermarket, said it was 2800.
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Old 07-27-2010, 11:14 PM
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if the trans converter applies when in reverse and first gear hot or cold, there is a cross leak, something installed incorrectly. As mentioned there is by design no oil pressure delivered for lock up in first gear or reverse

If the problem goes away when the trans is hot , still sounds like a cross leak to me
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Old 07-28-2010, 05:35 AM
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Thanks to all, I'll pull it and check it out.
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