My Trans temps seem to be right @ 200* no matter the driving conditions, if i'm really screwing around it will go up a little. It can be stop and go, 75 down the freeway, loaded, unloaded. I have changed the fuild and filter once @ 10k and refilled w/ a Syn. type Dex III, I now have 13.5k. Would it be benificial to change to a deep finned pan? If so which one? Will the Dealer give me a hard time about it if I ever need Trans work? TIA.

Extra capacity will help.


A new replacement cooler is in the works.


Look in the Allison Forum for a post by MIKE L.





Thttp://www.dieselplace.com/forum/smileys/Big Smile.gifNY

I'll have to respectfully disagree with added capacity will help in dropping temps,I too thought so at one time.


My Suncoast stag V will run just off 200 degrees stop and go running it hard with AC on ,which contributes. I'm running synthetic Mag Hytec cast which holds even more fluid.


What your seeing is well with in the operating temps of the Allison transmission in warm ambient temps.


Whether or not Aux cooling will help or not isn't proven yet. If so any drop in operating temp is good for fluid viscosity consistency, longevity and clutch cooling.


There is a solid differance in Sump temp as to OE sensor IC reading.near 20+ degrees that I'm seeing in stock cooler operation.





Mac Edited by: Mackin

I'll be switching to an Allison deep pan and transynd early next week. If I see any noticeable difference I'll post. JJhttp://www.dieselplace.com/forum/smileys/Geek.gif

What you need to do is add cooling fins to the stock pan to get it to cool more. Kind of like a radiant heat thing. Just hope you don't knock the fins off, though, then it wouldn't work. Space 'em about 3/8" apart, about 1-1/2" tall across the entire pan, I bet it would lower temps some. Maybe not a lot, but some.


Someone that's got an old pan for sale for 20 bucks should try it out.


I don't understand how adding extra capacity could make it cooler, just makes more fluid to cool. You aren't changing the cooling capacity of the system (well maybe a tiny fraction with the extra surface area of the outside of the deep pan, but not much).


DennisEdited by: baimpala

Baimpala, I'm not sure who your question was directed to, but my logic follows: The deep pan I am installing is the "standard" pan Allison puts on the 1000 series Allison transmission. GM uses the smaller pan for some reason. Also, I've read the transynd fluid also helps reduce operating temperature, we'll see. I tow heavy (16k-18k toy hauler) so tranny protection is a high priority.


BTW, I will have my stock tranny pan. If someone wants to experiment with it let me know. JJ http://www.dieselplace.com/forum/smileys/Big Smile.gif

JJ,


You remember Deep Thoughts by Jack Handy? Well, think of me as Random Thoughts by Dennis. You get the idea. The old pan for sale for 20 bucks comment was for GMC-2002-Dmax, as I believe he has one of those for sale (another random thought). turobotug's original post had a question about a deep finned pan, so I was just giving my $0.02 about finning a pan to make it shed heat.


Dennis

A deep sump pan is a plus, synthetic fluid is a plus. I have not seen either drops temps in the Ally. Synthetic trans fluid will give you a much better operating range as far as heat goes. A bigger cooler will help the most.


mike

The Mag Hytec is a well built heat sink pan. It will shed heat "parked" real well,quickly.


There is only a slight drop in temps at prolonged interstate travels,maybe ambient temp related.


I have rolled out of 80ish ambient temps stop and go to 65 degree temps and see the Allison settle in to a most comfortable range engine temp unchanged.


The AC plays a major roll in tranny temp and My AC is nipple hard cold,no complaints. I use it I have HP to spare!





Mac

Mackin states: The AC plays a major roll in tranny temp and My AC is nipple hard cold,no complaints. I use it I have HP to spare!


http://dieselplace.com/forum/smileys/Question.gif Mackin, I had no idea the AC could significantly affect tranny temps. Here's what I think I knowhttp://www.dieselplace.com/forum/smileys/Geek.gif: AC pulls HP from the engine and causes the engine to work harder raising engine temps; the tranny fluid is both cooled(summer) and heated(winter) by flowing the tranny fluid around the radiator. If the engine is working harder due to the AC it logics the engine coolant will be hotter going to the radiator, therefore the radiator is operating at higher temps which reduces the cooling affect on the tranny fluid(did that make sense?) Am I close? http://www.dieselplace.com/forum/smileys/Confused.gif I tow heavy and every tidbit of intel I can gather is appreciated.


Mike L: Good points. JJ http://www.dieselplace.com/forum/smileys/Big Smile.gif

I will be marketing a nipple muffler soon, specially designed for members that have those defective super cool A/C units. http://www.dieselplace.com/forum/smileys/HiHi.gif It will be an add on to my Ally cooler. http://www.dieselplace.com/forum/smileys/Cool.gif


mike

Who wants to be the first with "nipple muffler" in your sig ?! http://www.dieselplace.com/forum/smileys/Clap.gif

Nipple muffler? I need a scarf! http://www.dieselplace.com/forum/smileys/Big Smile.gif


The AC Condenser creates alot of heat which attributes to less efficient cooling availability especially in high ambient temps at slower speeds.





Mac

Last week I saw my trans go 1 notch over 200 for the first time ever, despite towing, stop and go traffic, hill climbing, whatever. Crawling in street traffic for at least 20 mins, in 100' ambient in Saugus (how the hell does Trippin go fast in that town?) with no forward motion and no wind outside. Need a bigger cooler, and a temp switch controlled or manually controlled fan for just those conditions. Coolant temp has never moved from warmed-up 205' by factory gauge no matter what (probably stuck there :) ). In cold weather, trans usually stays at 150'.

Mackin, was I even close with the increase in radiator temp when running the ac logic? JJ http://www.dieselplace.com/forum/smileys/Confused.gif

Temps and trans.


300 + Trans failure


270 damaging high temp. seals and clutches burn


250 damaging high temp varnish forms


230 damaging high temp valves stick


210 above avg temp pressure drops


190 normal operating temp


175 low temp longer trans life!

WELL, AS MY SIG SHOWS I'VE INSTLLED THE MAG-HYTEC TRANNY PAN AND I HAVE YET TO SEE ANY TEMPS LIKE I WAS, AND IVE BEEN TRYING TO GET THEM UP THERE TOO!http://www.dieselplace.com/forum/smileys/Big Smile.gif IT SEEMS TO HAVE GIVEN ME ABOUT 20-25* DROP UNDER REGULAR CONDITIONS, AND HAVE'NT SEEN OVER 200* WHEN MY FOOTS IN IT ALOT. WITH AMIENT TEMPS 110*+ IT'S NICE TO KNOW HEAT IS LEAVING.

turbotug


If your temps dropped 20-25 deg, it was not the pan that did it.


mike