4500 auto gu

Submitted: Thursday, Mar 21, 2019 at 16:01
ThreadID: 137997 Views:622 Replies:3 FollowUps:3
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Ideas for putting after market gearbox transmission cooler on has others done this to lower gearbox temps when towing
Thanks
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Reply By: Athol W1 - Thursday, Mar 21, 2019 at 16:26

Thursday, Mar 21, 2019 at 16:26
Philip
Any auto transmission will thank you for lowering its operating temp and reward you with a longer service life (I do not mean extended service intervals).

It is commonly accepted that for every 10 degrees that you reduce the transmission operating temp you double its life, however it is also accepted that the transmission should reach temps into the 60's.

Hope this helps.
Regards
Athol
AnswerID: 624538

Reply By: RMD - Thursday, Mar 21, 2019 at 16:45

Thursday, Mar 21, 2019 at 16:45
Philip
Seeing your auto isn’t a latest model it will be in slip mode a bit more often than today’s model. When towing it will develop more heat into the fluid as a result. If you place the cooler in the exit line, the out line from the auto, it has the most difference to ambient airflow temp and will get rid of more heat as a result. If the radiator water temp is getting hot at the bottom of the radiator, then it has less cooling ability reserve for the engine. Having less auto fluid heat into the water about to go to cool the engine, ensures you keep a good level of cooling reserve. As Athol mentioned, you DO want it to run at least 60 to 80C though, because that is the temp range the system is designed to operate in. Yes they will run colder and much hotter but it isn’t good for it.
AnswerID: 624539

Follow Up By: Robin Miller - Thursday, Mar 21, 2019 at 19:52

Thursday, Mar 21, 2019 at 19:52
Just on Philips slip comments - reducing slip does work , while my patrols auto is the later version I had it reworked to increase clamp pressure and react faster which combined with syn oil makes it not quite as smooth but improved its performance , lowered temps and allegedly dropped fuel use by 1/3lt per 100km .

Your auto is simpler and there are many posts about mods to it .
Robin Miller

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Follow Up By: RMD - Thursday, Mar 21, 2019 at 21:35

Thursday, Mar 21, 2019 at 21:35
Robin
Not sure what you mean by increasing clamp pressure. It isn't the slipping of clutches we are talking about but the slip of the torque converter action and it's ability to create heat in the fluid. That is the coolers job to dissipate additional heat.

Yes, lower gear or lighter load reduces that slip rate. However, any slip in the clutches, a whole different concept, will fry the clutches plenty quick, if/when slip occurs for other than the designed change time interval.
Too cold a fluid can cause that, cold oil = fried clutch if working under high torque load. Doesn't take much time at all to burn a clutch pack with engine power.

Your mods will make it clamp and limit clutch slip to absolute minimum.
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Reply By: Member - Bigfish - Thursday, Mar 21, 2019 at 20:51

Thursday, Mar 21, 2019 at 20:51
Can you possibly have a torque convertor lock up kit installed? Will dramatically reduced box temp and save fuel.
AnswerID: 624541

Follow Up By: Member - Bigfish - Thursday, Mar 21, 2019 at 20:54

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