Cold weather overdrive trick - Page 2 -
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Unread 01-28-2014, 05:44 PM   #16
green backs to no backs
coralman's Avatar
1998 ZJ 
Join Date: Jul 2010
Location: florida
Posts: 4,441
This valve will allow converter to fill in park and rapidly,supposedly cutting down on wear internally.

Move over bear.I'm tired of working on the jeep

Links to axle rebuilds, mount replace,a/c box rebuild,ect in history section of my profile page
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Unread 01-28-2014, 09:43 PM   #17
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1998 ZJ 
Join Date: Sep 2010
Location: Lake Forest, CA
Posts: 497
Originally Posted by ZeeJay1997 View Post
i cant answer true or false cuz the bottom line is IDK.

i looked at the fsm and it is unclear on what the fluid is doing in park. no fluid is moved in the tc in park, but i'm not sure what the rest of the hydraulic system is doing. fsm is very clear what the fluid does while in the different gear positions. it stands to reason that since the pump is being driven by the tc hub at all times, the pump has to move some fluid.

It looks to me like that in neutral it moves more fluid than in park. the extent of the difference is unknown to me. So my guess is that the fluid being moved in park would warm up faster than the fluid moving while in neutral. But the second you put it in gear, the cold fluid from the TC is added to the mixture and cools it back down.

So you still have a theory... of someone who's guessing
If you you had fluid being pumped and idled long enough for the engine thermostat to open you'd start to get some heat exchange opposite the intended way from the fluid being pumped thru the radiator trans "cooler".
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