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Old 05-03-2007, 08:25 PM   #15
Rivet Master
 
1960 24' Tradewind
santa barbara , California
Join Date: Apr 2006
Posts: 1,352
Hello everyone ,

One extremely important thing to remember is NOT to operate your
truck in 4 low or high on hard dry pavement turning or not ,although turning is worse do to the fact that all four tires do not rotate equally and binding will
occurr and breakage is going to happen ,not if ,but when ,bet on it.
your owners manual clearly states not to engage 4 wheel drive on hard surfaces, and its true for all 4 wheel drive vehicals with NON full time function older vintage rigs and new .I have a customer who pulls his trailer up his steep driveway and twice has broken the rear end carrier into bits in the rear differential ,its a 30 ftr and he puts it in 4 low also ,takes the chance ,done
it 2 times .The GM rear differentials are weak by design so this added strain
does break them .The trans temp is too high and the fluid is broken down
by this overheating of the fluid .It cannot perform its function properly ,carrying away heat to the cooler and lubricating the transmission components.The best solution is to use an electric cooling fan mounted in front of the trans cooler ,operated by a toggle switch on the dash .you then can turn on the cooling fan when you need to ,so in traffic you can flip on the fan and cool down the trans ,or up hills and so forth .Find a cooler supplier that has these fans or just get an electric fan setup from Summit
Racing products or other source that can be fitted in front of the cooler.
This also is why you really want the 4:10 gear ratios with theses suburbans
rather than the 3:73 so you have lower gears which help get the load moving
especially in reverse ,in any case ,get a fan for that cooler.continuousely
overheating the fluid will kill the transmission .

Scott of scottanlily
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Old 05-04-2007, 12:03 PM   #16
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2000 25' Excella
Kingston , Tennessee
Join Date: Aug 2006
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Fan

I have a fan on my trans cooler, temp usually stays between 180 and 200. Does switching to synthetic fluid reduce the temp any?

My concern is if it is running 180-200 not towing, then what is it going to do when I am towing?
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Old 05-04-2007, 12:48 PM   #17
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1978 24' Argosy 24
Woodinville , Washington
Join Date: May 2006
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Quote:
Originally Posted by Silver Threads
My concern is if it is running 180-200 not towing, then what is it going to do when I am towing?
Sounds like you've done everything else; deep pan, external cooler, electric fan. Why not go with synthetic? If you believe the advertising it will lower tranny temp. I think it does/did but since I didn't have the temp gage installed prior to the switch over I can't say for sure. It's certainly better at withstanding high temperature. However you ultimately want to avoid that condition as it's going to be hard on the seals, bands, and clutches not to mention your sanity

I'm surprised your transmission runs that hot under normal driving conditions Others have pointed to the Sub as being a bit lacking in cooling by design. I thought that from the firewall forward they were the same as the pick-up trucks Anyway, it's all about margins. You want to be able to know that if you get stuck in traffic when it's 95 degrees out you're not going to have a melt down.

It's pretty hard to compare numbers with people since sensor placement has such a big impact and who knows how accurately the gages are calibrated.

I'm wondering what type of cooler you added. The plate type are supposed to be more efficient than the tube and fin. Then there's all different sizes of plate coolers. Some of the plate cooler manufacturers advertise the design as a passive bypass where the full flow through the cooler is inhibited until the ATF reaches a certain temperature.

-Bernie

PS. Tammy's curtains look great. I hope to get to that point on the "2do" list sometime in this life!
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Old 05-04-2007, 04:56 PM   #18
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1993 21' Sovereign
Colfax , North Carolina
Join Date: Jun 2003
Posts: 20,190
Quote:
Originally Posted by bhayden
I thought that from the firewall forward they were the same as the pick-up trucks Anyway, it's all about margins. You want to be able to know that if you get stuck in traffic when it's 95 degrees out you're not going to have a melt down.
They are identical, but they are lugging an extra thousand pounds of glass and sheet metal around that the pickup doesn't have to.
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Old 05-10-2007, 12:36 AM   #19
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1992 34' Limited
Falls Church , Virginia
Join Date: Mar 2005
Posts: 945
GREAT posting Bernie!

Bernie -

GREAT posting about the mod to you tranny. I am a VERY visual person and that was exactly what I was looking for (and NOT finding) to approach the work myself. Thanks!!!

BTW - Is there a similar, or perhaps the same?!, port or location on the 4L80E tranny? I ask since that is the one on my '01 K2500.... according to Chevy, the current gauge sender is on the passenger side, in the sump area. I want to add another for additional info...

Anyone have a URL for addition of a fan to the front of a 00+ chevy/gmc??? Hoping...!!! Local Speed shop has a 14" fan for about $69 but includes nothing - not too bad price wise, or?? Guessing that I'll try the fan route first, before adding an additional cooler and all that that entails... Or am I missing something else here....?!??

Axel
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Old 05-10-2007, 01:04 PM   #20
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1978 24' Argosy 24
Woodinville , Washington
Join Date: May 2006
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Can't take credit for the web page on the tranny mods. It's just one I found but I plan to relocate my sending unit from the pan to the port described. The guy also has a similar "how to" on the install of his trans cooler. Very nice instructions indeed.

The addition of a fan is the way to go for stop & go driving and/or parking since that's the only way to get airflow over the cooler. No air flow no cooling! It won't help much at speed and may even block some of the cooling air. Make sure the fan is on a temperature switch or (my preference) a manual switch. With a manual switch you can turn it on BEFORE it overheats

-Bernie
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