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Open Roads Forum  >  Towing

 > Escalade/Denali or Suburban 2500

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wnjj

Cornelius, Oregon

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Posted: 04/03/21 10:27am Link  |  Quote  |  Print  |  Notify Moderator

Some GM vehicles have a list of RPO codes in the globvebox.

https://www.differentials.com/gm-axle-ratio-identification-codes/

Sjm9911

New Jersey

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Posted: 04/03/21 11:40am Link  |  Quote  |  Print  |  Notify Moderator

What exactly are you towing? Guessing its 6000 lbs may be a mistake. You shoyld be able to tow that , maybe not accelerate as fast, but you should get to speed. Im thinking it may be heavier then you think.


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Seon

Lake Camanche, CA

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Posted: 04/03/21 12:01pm Link  |  Quote  |  Print  |  Notify Moderator

Hey OP, I just re-read your post and nothing mentioned that you have the "Tow" feature on. If the transmission is constantly downshifting on level ground then that to me is an indicator that you're still driving in "overdrive" and not in the tow mode.

BenK

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Posted: 04/03/21 12:02pm Link  |  Quote  |  Print  |  Notify Moderator

Agree, weigh your setup, axle by axle to know where you are

Also, with a guesstimated trailer weight of 6,000...you are most likely over the dead weight rating of your reciever.

Most Suburban OEM receivers dead weight rating is 500 lbs

To check what diff ratio, either check the RPO codes as others have recommended.

If bought used...previous owner(s) may have changed the diff ratio

Consider tieing a length of string to the driveshaft.

Then roll the vehicle one tire rev. Use a valve stem as a datum.

Then count the number of string turns. That will be the diff ratios whole number

Fractions if a turn left will be the diff ratios fractional number.

3 whole turns is a 3.xx

3/4 of a turn is x.73

Remove the string...

Edit...assume you are NOT towing in OD if no tow/hail function on your dash


-Ben Picture of my rig
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1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
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Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
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Gold

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Posted: 04/03/21 07:15pm Link  |  Quote  |  Print  |  Notify Moderator

Thank you all for your reply’s. I have heard that gearing would help. What gearing did you have on your ‘07 Yukon?

Also, what negatives have you heard about the Escalade? Should I assume that whatever is negative on the Escalade also applies to the Denali as they are largely the same vehicle?

Gold

IL

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Posted: 04/03/21 07:25pm Link  |  Quote  |  Print  |  Notify Moderator

I do have the tow haul turned on always when towing. The difference that is clearly felt with tow/haul on is firmer shifts at a later rpm. The downshifting issue from 4th to 3rd at highway speeds is with tow/haul turned on. Cruise control is basically not useable as any slight acceleration cruise needs to maintain speed will cause a downshift. I can go faster (barely the speed limit) if I don’t use cruise and try to hold a steady foot at the Max power I can hold in 4th gear right before it would downshift to third. My other trick is to put the computer on “instant mpg”. 4th gear at 9MPG is the magic number to maintain. The slight acceleration that would drop instant mpg to 8mpg will result in a downshift to third even with tow/haul on.

Gold

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Posted: 04/03/21 09:40pm Link  |  Quote  |  Print  |  Notify Moderator

I am guessing at the weight of the trailer. It’s an 18ft v toy hauler with dual 10k lb axles. It has a 2375 lb car inside, and I’ve estimated under 500 lb of misc. gear.

Grit dog

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Posted: 04/03/21 10:22pm Link  |  Quote  |  Print  |  Notify Moderator

Pretty sure all the Denali’s and Escalades are 3.42 gears.
400+ Hp and the 6 speed will blow the doors off of a 4 speed 5.3.


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Seon

Lake Camanche, CA

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Posted: 04/04/21 07:33am Link  |  Quote  |  Print  |  Notify Moderator

Gold wrote:

Thank you all for your reply’s. I have heard that gearing would help. What gearing did you have on your ‘07 Yukon?

Also, what negatives have you heard about the Escalade? Should I assume that whatever is negative on the Escalade also applies to the Denali as they are largely the same vehicle?


Yukon had 3.73

The Denali is a GMC Yukon with added Bling Blings.

Do a search 'Escalade towing pros and cons' and decide if that's the vehicle you want.

Here's three youtube on Escalades that may interest you.

https://www.youtube.com/watch?v=K7_XgpFecPQ

https://www.youtube.com/watch?v=50OJguHtpm0 mark 2.06 min

https://www.youtube.com/watch?v=gTXuzeu6PTc

Best of luck.

* This post was edited 04/04/21 07:53am by Seon *

BenK

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Posted: 04/04/21 11:07am Link  |  Quote  |  Print  |  Notify Moderator

Haven't checked in a few years, but the AWD system has a viscus 3rd member (3rd differential inside the transfer case and uses a fluid to couple and provide the slippage needed for AWD).

That viscous 3rd member used to be a weak point when towing heavy and serious off-roading.

So, it will depend on how big your trailer is and if any serious off-roading is your plans. There is nothing 'wrong' with this, just know that it has limits

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