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Unread 03-07-2009, 10:26 PM   #1
Stafford
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Best way to cool auto tranny on trail...jeep on or off?

So I just got back from Rausch Creek a little bit ago and think I had some minor problems with the tranny overheating. For a little bit there it wouldn't shift into 2nd so I pulled the dipstick and the fluid level was a little high (it was just north of the 'squiggly' part of the dipstick) and I know it has the correct amount of fluid. Logic seems to dictate it was a little hot, fluid has less viscosity so it wouldn't shift. Had been doing a ton of hill climbs so not all the surprised and generally beating the crap out of it.

Question is...at this point if I want to cool the transmission to the proper temp is it better to leave it running and idle or turn it off? My initial reaction was to turn it off but after turning it back on 20 minutes later my engine temp was about 215 and then dropped to the normal 205ish a minute or so after starting. This is assuming a limited window of time (say <60 minutes)...obviously if I turn it off for 8 hours it's going to be cooler than if it left it running the whole time.

FWIW, since I'm sure it will be suggested, I already have a deep pan and have been planning on a tranny cooler. Radiator is just over two years old, fan clutch and thermostat were replaced <1 year ago.

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Unread 03-07-2009, 10:29 PM   #2
Unlimited04
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http://www.stu-offroad.com/engine/tr...ranscool-1.htm
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Unread 03-07-2009, 10:35 PM   #3
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I can't really say for certain what is right, but if I had an auto tranny that was overheating, I would probably play it safe and turn it off for a while.
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Unread 03-07-2009, 10:37 PM   #4
Unlimited04
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also: http://www.stu-offroad.com/engine/aw-4/aw-4-16.htm
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Unread 03-07-2009, 10:42 PM   #5
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I think to answer your question, You do have circulation while the vehicle is running. While the engine is still producing heat, it is made to reduce it's own heat as well. Keep in mind if you have been in an off-road situation that you need to make sure your radiator and tranny coolers are cleaned out & free from debris.

Also synthetic fluids, such as Amsoil, can hold up better in those high heat situations. Here is a Link to Our ATF.
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Unread 03-07-2009, 10:47 PM   #6
Jerry Bransford
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To cool it when it get hot, keep the engine running and shift the transmission into Neutral which keeps the pump going to keep the ATF circulating through the tranny cooler that is part of the radiator. Don't put it into Park, the pump doesn't run in Park. That's the fastest way to cool down an automatic tranny.
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Unread 03-08-2009, 08:53 AM   #7
Stafford
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Quote:
Originally Posted by Ridin' Around View Post
I think to answer your question, You do have circulation while the vehicle is running. While the engine is still producing heat, it is made to reduce it's own heat as well. Keep in mind if you have been in an off-road situation that you need to make sure your radiator and tranny coolers are cleaned out & free from debris.

Also synthetic fluids, such as Amsoil, can hold up better in those high heat situations. Here is a Link to Our ATF.
This is gonna sound like a setup but after getting my tranny rebuilt in November I just let them put whatever in. I have two cases of various Amsoil products in the garage and that's normally what's in there. Haven't had overheating problems like this normally so i think it's time to switch back.

Quote:
Originally Posted by Jerry Bransford View Post
To cool it when it get hot, keep the engine running and shift the transmission into Neutral which keeps the pump going to keep the ATF circulating through the tranny cooler that is part of the radiator. Don't put it into Park, the pump doesn't run in Park. That's the fastest way to cool down an automatic tranny.
This actually did cross my mind yesterday but I didn't do it. There were several times sitting in park waiting for people to get winched out, etc. I think I'm going to get in the habit of leaving it in neutral w the parking brake on (assuming level ground, etc).
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