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Transmission Discussion of preventative/corrective maintenance and other technical issues regarding your coach's transmission.

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Old 04-05-2010
GPSGary GPSGary is offline
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Default Tranny cooler

Since I'm not using (and never will) the dash cooler assembly on the rooof, I was wondering if it's possible and practical to convert it to a transmission cooler?

If not any suggestions where to mount an aux cooler? These 10% grades in Central America are murder.
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Old 04-07-2010
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Gary.. I'd like to make two suggestions;

1) Don't mount a tranny cooler higher than your dipstick! (Think about that)

2) All pumps work against resistance. Height is a resistance, so do your home work on those pumps and flow.

There.. 2 cents worth.
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Old 04-07-2010
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Off road race trucks have been known to use coolers above the trans pan. Complicated plumbing and difficult to purge the air out of system. Better to look into larger heat exchanger.
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Old 04-07-2010
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Quote:
Originally Posted by Mike Hohnstein View Post
Off road race trucks have been known to use coolers above the trans pan. Complicated plumbing and difficult to purge the air out of system. Better to look into larger heat exchanger.

Mike,

I have thought about either adding a heat exchanger or else going with a larger one under the coach somewhere (with fans of course) and removing the trans. cooling from the radiator. Do you know how many PSI the trans puts out? I would hate to buy a heat exchanger some day that couldn't handle the pressure. Thanks...
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Old 04-07-2010
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Gary,

The roof condensing unit would probably be best left as ornamentation. FC's don't look like FC's without it. As far as a safe, practical use, don't know??
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Old 04-07-2010
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Quote:
Originally Posted by mynavion View Post
Mike,

I have thought about either adding a heat exchanger or else going with a larger one under the coach somewhere (with fans of course) and removing the trans. cooling from the radiator. Do you know how many PSI the trans puts out? I would hate to buy a heat exchanger some day that couldn't handle the pressure. Thanks...
High side on a trans is 275 psi, normal operation 150 to 200.
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Old 04-07-2010
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Quote:
Originally Posted by Mike Hohnstein View Post
High side on a trans is 275 psi, normal operation 150 to 200.
Thanks Mike...
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Old 04-08-2010
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Quote:
Originally Posted by mynavion View Post
Mike,

I have thought about either adding a heat exchanger or else going with a larger one under the coach somewhere (with fans of course) and removing the trans. cooling from the radiator. Do you know how many PSI the trans puts out? I would hate to buy a heat exchanger some day that couldn't handle the pressure. Thanks...
I happened to see this at surpluscenter and thought of your post...

JIC 12 HYD OIL COOLER $159.99

https://www.surpluscenter.com/item.asp?item=9-7743
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Old 04-08-2010
mynavion mynavion is offline
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Thanks Bob,

Actually when I do get around to doing this (too many projects lined up already) I am thinking along the lines of something that looks like an automotive radiator or heater core. One of the requirements will be however that it has 1" tubing (same as Allison). The 3/4" shown on the example at surplus center may be too restrictive. Thanks for keeping me in mind however and thanks for contributing to the group.

John

Quote:
Originally Posted by fishfarm View Post
I happened to see this at surpluscenter and thought of your post...

JIC 12 HYD OIL COOLER $159.99

https://www.surpluscenter.com/item.asp?item=9-7743
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  #10  
Old 04-08-2010
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I would use a water to oil type cooler,instead of an air to oil.
I tried an air to oil cooler on my pickup and it never did cool very good,i changed to a water to oil unit and mounted it under the truck and ran heater hose to it and its fine.
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