[hzjcm8]

With that in mind, When performing the double drain/fill with a fresh batch of Transynd, would it then be better to drain when at operating temp vs cold?

Viscosity is proportional to temperature. Therefore, as the fluid gets warmer it flows more easily. So, it's best to do it with the transmission fluid warm. You can do it faster that way.

 

[Hook'em_Horns!]

"ROLL TIDE" Mr. Football?

Can't wait for ya'lls game Sat....:farmer
Joanni Foosball needs a good spank

 

[Bama1]

Sure I shouldn't post here but forgive me. Manziel is great just a shame he has to be so cocky. Glad AJ McCarron distanced himself from Manziel.
I pull for Texas in their conference. Mack Brown better start winning. Just don't go after Saban.

 

[franks71vw]

Sub'd! Wow, well finished reading all 17 pages of this forum (40 post per thread) and wow why didnt I join this forum sooner. Well I am the second owner of my truck and picked it up with 69K Miles. Appx. every 35K I have drained the oil in my (extended volume) pan, changed internal filter and oil and every 12 changed the spin on filter. Glad to see that I didnt need a deep pan which now will make me spend more $$$$ doing the Double Drain of the oil. Since my tranny has never had temperatures reach near the 250 mark then I guess I will be saving about $250 Beans on the Earl Tranny cooler setup. My oil temps reaches at worst ever 210 degrees so far.. Now if I could only find my stock tranny pan. I guess once my injectors are done I will be doing Oil Analysis on my engine oil and Tranny. Now going to go back and find Mr. Johnsons company link.

Just posting this for quick reference http://www.jglubricantservices.com/online_store.html

 

[Frank Stiff]

If your truck is under warranty TES-295 fluid is NOT approved per GM no matter what Allison states, read the dipstick DEX-IV fluids only for my 2006 while under warranty. After that use what you want.......

How about reading your owner's manual, diesel supplement, where it tells you that Allison recommends TES 295 spec fluids are recommended for femperatures below -40 deg F. In the 2011 manual, the information is on pages 10-14 and 11-9. Don't know how GM can void warranty when fluid they recommend in their manual is used!

 

[benson.226]

hzjcm8,
Whats your take on maintenance of a 2005 transmission with 220,000 miles. I just bought the truck, and I have no idea what the maintenance records were. The only thing I know for sure is nothing had been done from 195,000 miles to the current 220,000 miles. From what I can tell, the transmission shifts smoothly, and the truck is 100% stock.

 

[Aaron@LDS]

Ive seen a (lazy) guys go over 60,000 miles without servicing the transmission fluid or filters and it was supprizingly shifting smooth and fluid wasn't burnt when He finally changed it.

This however is not a reccomendation, and was on a built trans.

 

[ieetgluu]

I drained 115k mile old Royal Purple(from the 1st owner) out to put in tes-295, it shifted fine before and after

 

[Tiby]

HI Tom I have an 08 2500hd 3.73 with a tow package every thing is stock 70k miles .
I bought the truck for towing a trailer about 7,000 lbs.
When I'm towing I get up to speed and temp (engine and trany) 55-60 mph .
I can travel at this speed cruise on ,tow haul on ,and be in 6th gear . I have done this for many miles I keep my display on transmission temp and I see little variance in the trany temp . Sometimes I have to turn the tow haul Off for short a time to get the transmission to shift into 6th.
Last weekend outside temp 55 2hr trip from Cleveland to southern Ohio transmission variant was 148-155tops.
Am I damaging or overworking my transmission?
At these speeds I can see 13-14 mpg

 

[dieselnuts6]

HI Tom I have an 08 2500hd 3.73 with a tow package every thing is stock 70k miles .
I bought the truck for towing a trailer about 7,000 lbs.
When I'm towing I get up to speed and temp (engine and trany) 55-60 mph .
I can travel at this speed cruise on ,tow haul on ,and be in 6th gear . I have done this for many miles I keep my display on transmission temp and I see little variance in the trany temp . Sometimes I have to turn the tow haul Off for short a time to get the transmission to shift into 6th.
Last weekend outside temp 55 2hr trip from Cleveland to southern Ohio transmission variant was 148-155tops.
Am I damaging or overworking my transmission?
At these speeds I can see 13-14 mpg

Based on what? You basically just said, "I drive my truck am I overworking it?"


Sent from AutoGuide.com Free App

 

[C20ELEPHANT]

Check your owners manual about towing in 6th gear. Tow haul mode is best when towing.

 

[NorskeNY]

The temperatures you are seeing should not cause any concern. If you were seeing sustained temps above 210 degrees then I would be concerned. My 2011 tranny runs much cooler - 30 to 40 degrees cooler than my 2005 did. Mine runs 130 to 170 when towing (fall-spring/summer)

I use tow haul mode when towing and when not towing. My last CAT scale had a truck and trailer weight of 20,180 lbs when towing our fifth wheel.


From my 2011 manual:
Tow/Haul is designed to be most effective when the vehicle and trailer combined weight is at least 75 percent of the vehicle's Gross Combined Weight Rating (GCWR). Tow/Haul is most useful under the following driving conditions:
. When pulling a heavy trailer or a large or heavy load through rolling terrain
. When pulling a heavy trailer or a large or heavy load in stop-and-go traffic.
. When pulling a heavy trailer or a large or heavy load in busy parking lots where improved low speed control of the vehicle is desired.

Operating the vehicle in Tow/Haul when lightly loaded or with no trailer at all will not cause damage. However, there is no benefit to the selection of Tow/Haul when the vehicle is unloaded. Such a selection when unloaded may result in unpleasant engine and transmission driving characteristics and reduced fuel economy. Tow/ Haul is recommended only when pulling a heavy trailer or a large or heavy load.

 

[HD Dmax Machine]

HI Tom I have an 08 2500hd 3.73 with a tow package every thing is stock 70k miles .
I bought the truck for towing a trailer about 7,000 lbs.
When I'm towing I get up to speed and temp (engine and trany) 55-60 mph .
I can travel at this speed cruise on ,tow haul on ,and be in 6th gear . I have done this for many miles I keep my display on transmission temp and I see little variance in the trany temp . Sometimes I have to turn the tow haul Off for short a time to get the transmission to shift into 6th.
Last weekend outside temp 55 2hr trip from Cleveland to southern Ohio transmission variant was 148-155tops.
Am I damaging or overworking my transmission?
At these speeds I can see 13-14 mpg

Just turn on tow haul mode, put it in drive, & set cruise.

 

[hzjcm8]

One more dumb question and I think I will be good to go. Why does your fluid level read higher when the transmission is hot? Does the fluid expand? When hot that would mean you have more fluid than when cold. I would guess if you poured 1 quart of fluid in a pan and put it on a stove the fluid would expand as heated. Same as coolant fluid I guess.
If this is true it looks like the cold reading would be the most critical reading as that is when you have the least oil.
A little physics I've missed.

Bama1,

I may have already answered this; but, "yes", transmission fluid expands when heated. This property is known as the "Coefficient of Thermal Expansion" and for transmission fluid, it's typically around 0.00042 gallons per gallon (or quarts per quart) per degree Fahrenheit increase in temperature. The fluid expands volumetrically or in all directions. But, since it's constricted by sides of the pan, it can only expand in upwards so it reads higher on the dipstick.

 

[hzjcm8]

hzjcm8,
Whats your take on maintenance of a 2005 transmission with 220,000 miles. I just bought the truck, and I have no idea what the maintenance records were. The only thing I know for sure is nothing had been done from 195,000 miles to the current 220,000 miles. From what I can tell, the transmission shifts smoothly, and the truck is 100% stock.

Benson.226,

Get the fluid analyzed and let me take a look at the results. Send me a PM and I can help you with that if you're interested. The fluid analysis will tell us the condition of the fluid and the transmission and then you can make a good decision about what to do.

 

[hzjcm8]

HI Tom I have an 08 2500hd 3.73 with a tow package every thing is stock 70k miles .
I bought the truck for towing a trailer about 7,000 lbs.
When I'm towing I get up to speed and temp (engine and trany) 55-60 mph .
I can travel at this speed cruise on ,tow haul on ,and be in 6th gear . I have done this for many miles I keep my display on transmission temp and I see little variance in the trany temp . Sometimes I have to turn the tow haul Off for short a time to get the transmission to shift into 6th.
Last weekend outside temp 55 2hr trip from Cleveland to southern Ohio transmission variant was 148-155tops.
Am I damaging or overworking my transmission?
At these speeds I can see 13-14 mpg

Tiby,

No. You are not hurting the transmission. The electronic controls and the TCM (Transmission Control Module) are there to protect the transmission and to not allow you to do anything it wasn't designed to do. So, keep on trucking. The temperatures you're showing are really low. The transmission can run all day at 220F or more without any damage.

 

[jtwestring]

Dmaxryan10,

Allison published S/N cutoffs for transmissions with DEXRON-VI compatible seals. However, Allison no longer recommends DEXRON-VI for any of their products. TranSynd, or one of the other TES-295 fluids, is the best answer.

Checking with GM, "the Allison Trans for Duramax is manufactured by GM, not Allison, though it is their design. Dexron VI is the recommended fluid."

 

[66436]

DennyO,
DEXRON-VI is OK for newer trucks like yours. It won't last as long as TranSynd but it's OK for use. For the engine, you need to use an HDDO (Heavy Duty Diesel Oil) like either 15W-40 or 5W-40 and it needs to be API Category CJ-4. SAE 10W30 is a gasoline engine oil or what is also called a PCMO (Passenger Car Motor Oil).

hzjcm8,
I will apologize if you have already addressed this issue in another post but there is quite a few pages to this thread. I know that Dexron 6 is a synthetic blend fluid. Is this the reason it does not last as long as the TranSynd? I changed my fluid on my 08 with Vavoline full synthetic fluid last year. Got to admit with the fluid level exactly the same as before I noticed smoother more consistent shifting than with the original GM fluid it left the factory with. Dean

 

[jtwestring]

Thanks, I do use Mobil Delvac 15-40 in the engine. Its been hard to find the TransSynd, and man is it expensive. I put less than 10K on the truck annually and have been confused as to what to use in the trans. Owners manual says Dex VI and on line I hear TransSynd. Finally got an answer from GM. Will change it often.

 

[hzjcm8]

Checking with GM, "the Allison Trans for Duramax is manufactured by GM, not Allison, though it is their design. Dexron VI is the recommended fluid."

DEXRON-VI is only recommended in 2007 or newer pickups with the Allison 1000 Series transmission (Note: I believe transmission serial number break points for units with old vs new Viton seals can be found on this thread).

You are correct that the Allison 1000 Series for GM pickups is now manufactured in a GM plant. It was originally designed by Allison engineers when Allison was part of GM.