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Old 05-16-2007, 07:25 PM   #11
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and where my cabin is there are alot of good sized hills that seem to be hard on the entire car
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Old 05-21-2007, 03:23 PM   #12
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Instead of starting a new thread, I'll just add to this one. Oh masterful Bonneville gurus...I'm looking to add a trans cooler to my 99 (see mods). Does my series II come with an external cooler and/or do I need one? i'm planning on buying the re-programmed PCM next and figured I should get the trans cooler first. (tranny is re-built less than 10k on it.). How difficult is the install and where would I mount it? Oh, being Chicago area, hot summers, cold winters, idle time in rush hour traffic...blah, blah, blah.
Thanks,
Ken
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Old 05-21-2007, 03:28 PM   #13
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i bought one because i figured it was cheap insurance but most ofour trans failures arent due to overheating (4t60e-4t65-e), heres a quote from intense racing
Should I run a tranny cooler?

Only if you're planning to pull a trailer through the mountains. Otherwise, we recommend against it on vehicles with the 3800 FWD/4T60E/4T65E drivetrain.

We have dissected more of these trannies than anyone else in the performance aftermarket, and we have yet to see a single heat-related failure. Hard parts break in these trannies, and these failures will not be prevented by a tranny cooler.

Tranny coolers add unnecessary weight and opportunities for fittings to leak. A leaking fitting can let your tranny run dry in minutes and ruin it far faster than a little heat ever could.

Our trannies are cooled by the same radiator used to cool the engine. So running a colder engine thermostat will make both your engine and your tranny run cooler
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Old 05-21-2007, 03:33 PM   #14
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PA, your trans isn't a 4T65E. It'* a 4T60. Those ARE prone to heat-related failures.

There are varying schools of thought on this. With a cooler, your fluid will last longer, and you'll have less slip on very hot days.

My personal belief is that GM shouldn't have stopped putting Aux coolers on the L67'* in 96 like they did.

Both of my L67'* came from the factory with coolers. I upgraded drastically on my 93.

I also believe that if you've had a trans failure, you should BYPASS the cooler core in the radiator at any cost. They plug up with debris, restricting circulation in the system. In addition, the 4T65E uses PWM to manage the TCC at all times. Managing slip in this manner produces friction and heat more than you would see in a 4T60.
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Old 05-21-2007, 03:40 PM   #15
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Quote:
Originally Posted by willwren
PA, your trans isn't a 4T65E. It'* a 4T60. Those ARE prone to heat-related failures.

There are varying schools of thought on this. With a cooler, your fluid will last longer, and you'll have less slip on very hot days.

My personal belief is that GM shouldn't have stopped putting Aux coolers on the L67'* in 96 like they did.

Both of my L67'* came from the factory with coolers. I upgraded drastically on my 93.

I also believe that if you've had a trans failure, you should BYPASS the cooler core in the radiator at any cost. They plug up with debris, restricting circulation in the system. In addition, the 4T65E uses PWM to manage the TCC at all times. Managing slip in this manner produces friction and heat more than you would see in a 4T60.
true but i never said i had a 4t65 i have a motor home size cooler on mine just to be safe anyway- also if you want to avoid slip heres something currently in the works from us on 3800pro.com http://www.3800pro.com/forum/showthr...hlight=tractor
and here is the other link read all of this http://www.theturboforums.com/smf/in...&topic=58907.0

also: i am not advising anyone to do this just food for thought however i will be trying this and posting a writeup if anyone is interested
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Old 05-21-2007, 03:58 PM   #16
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91PA, the topic AUTHOR has a 4T65E which you can't draw a comparison to. Your transmission is a VERY different animal.

And we already have a writeup:

http://www.bonnevilleclub.com/forum/...ode=cat&cat=15
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