2nd Gen Non-Engine/Transmission Proper warming of auto transmission?

[NavyDoc]

A guy told me the other day that if you start a 2nd gen to warm up while in park, that the transmission fluid does not circulate. He said that you needed to put it in neutral with e-brake on in order to circulate the transmission fluid.

Anybody heard or know this to be true?



Does this apply to aftermarket trannies, if true? Suncoast, ATS, etc?



Thanks again.

 

[Joe Mc]

Hey again Doc - I'm certain on a stock trans in park it doesn't move much fluid, in "N" it moves the fluid. As for after-market trans I can only speak of what my DTT Installer/Builder told me "the trans is now set-up to move fluid in "P" as well as any gear".

Your question "Proper warming of auto transmission?" If it's cold out like now, I suggest upon cold start-up after engine is going and oil psi above 40 or at normal psi, pop trans in "N", let it idle for about 45 - 60 seconds and off you go - it "warms-up" as it worked just like the engine. Now in the summer time, you can if you want to pop in "N" until you're ready to take off, but the fluid will probably never get below 70* or so, depending on overnight temps.

Rule of thumb - regardless of how cold or hot the weather, first run of the day take it easy on things until the coolant temp needle budges off of 140* and you'll be good, or as the trans is concerned take it easy until you feel it start to shift normally.

Later

 

[WDaniels]

If you want to really warm up the transmission, set your ebrake, shift your transfer case into neutral, then put your transmission into gear and let it run until you think its warm. When the temps get real cold here, and by cold I mean -45 to -60 or more like its been here for 2 weeks, that is what I do. Except at those cold temps, I don't even have to set the ebrake. Its so cold that the tires are flat on the bottom and don't round out until you go a quarter to half mile. Hope this helps.

WD

 

[robbiesworld]

I put my truck in N for a few seconds to fill the converter in the morning. It drains down a little over night. I never warm anything up. Well sometimes my girlfriend... ... .

 

[RAmy]

i have tried this both ways myself with the old ladies '08 avalanche and i assume they circulate in P. It has a trans temp from the factory and either way when sitting idle before i leave it warms up at the same rate. older autos i have also heard move almost no fluid in park.

 

[Regcabguy]

DTT told me that after starting the truck to idle it in neutral for maybe a minute which will fill the convertor and away you go. It's most noticible in the winter. Same as when you do a service. I would drain 14 qts. out of it and would gradually fill it up in neutral,engaging the transmission periodically,then putting it back into neutral until the 14 qts was in there.

 

[Batphreak]

Stock 727 based autos from Chrysler (that's pretty well all the rear wheel drive trannies from the 60's on forward), simply recirc fluid through the pump when in Park. That's why the level has to be checked in Neutral. Chevvies and Ferds don't have this recirc mode in park and therefore park vs. neutral when checking fluid doesn't matter for those. Hopefully that helps clear things a little here.

 

[NavyDoc]

Sounds like it was accurate - no fluid moving in the trans at idle in Park. Thanks to all.