2007 GMC Yukon XL 2500

[Nap73]

Do the tow mirrors that are on it power fold or are they manual?

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

They power adjust and are heated but manually fold. Guys sending me the original mirrors.To be honest I’ll probably put those back on. The tow mirrors are huge.


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[Nap73]

What’s Normal trans temp on the highway? Today on about a 30 min drive the trans temp got to 205. Was doing 60 - 70 mph. It was 94 degrees out so that must have affected it to. Was just wondering what normal operating temps are.


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[gooffeyguy]

My Denali runs between 150-170 on the highway in 90* heat

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[Nap73]

My Denali runs between 150-170 on the highway in 90* heat

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

Why’s mine running so high then?

Trans fluid is good - pink with no burnt smell.


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[swathdiver]

Why’s mine running so high then?

Trans fluid is good - pink with no burnt smell.

Mine runs much cooler too. However, Tom and I have 6-speed transmissions on the 1500 chassis and we have electric fans, not an engine driven clutch fan.

There are a couple of guys on here with 2007 2500s, anyone remember names offhand so we can call them in?

 

[gooffeyguy]

Does it have an external trans cooler (in front of radiator)?

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[gooffeyguy]

Mine runs much cooler too. However, Tom and I have 6-speed transmissions on the 1500 chassis and we have electric fans, not an engine driven clutch fan.

There are a couple of guys on here with 2007 2500s, anyone remember names offhand so we can call them in?

Good point. I think the 2007 2500's have a different tranny?

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[swathdiver]

Good point. I think the 2007 2500's have a different tranny?

Yep, 4L80E (MT1)

 

[avalonandl]

Are these numbers correct....?
I know the 2001-2006 w/8.1L were rated up to 14k....and the limiting factor on the 2007-2013 was the hitch rating..... plus no more big block after ‘06....

The max towing was 12,000 lbs with the 8.1..... I know I had one -see my avatar. 2500 AV...

Loved it. The 4speed trans was the issue.....

 

[Nap73]

What your opinion on the tow mirrors?

I’ll get the original mirrors in a few days. Was thinking about putting them back on.




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[intheburbs]

The original mirrors are tiny. I hate them. Once you get used to the tow mirrors, you'll never go back. I put them on my Denali, too.

I know you have a different transmission, but mine generally runs about 90-100° over the outside temperature. I wouldn't worry about it until starts going/staying at 220°.

Goodyear Duratracs are an aggressive-looking tire. I bought them for the snow/rain performance, but they also happen to look good and do alright off road as well.

 

[Nap73]

The original mirrors are tiny. I hate them. Once you get used to the tow mirrors, you'll never go back. I put them on my Denali, too.

I know you have a different transmission, but mine generally runs about 90-100° over the outside temperature. I wouldn't worry about it until starts going/staying at 220°.

Goodyear Duratracs are an aggressive-looking tire. I bought them for the snow/rain performance, but they also happen to look good and do alright off road as well.

Yea the tow mirrors are starting to grow on me. Will probably leave them

The GMC 2500 has a different trans than the Suburban 2500 ?

Your Truck looks great Man real nice. I’ve got general grabbers with plenty of tread. There are a few things I’d like to do before the tires ie CarPlay radio,backup camera,exhaust etc.




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[Nap73]

Need exhaust ideas. I’ve got a magnaflow on My 04 but the drone is crazy

Also how much bigger of a tire could I fit with the 16” rim ?


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[Derick]

Yeah the 07 is a 4 spd. I don't mind it but it does hold back the towing capacity a bit. I thought the 07-08 had a max tow of ~6500#. And then in 09 with the 6 spd it went up.

 

[swathdiver]

The GMC 2500 has a different trans than the Suburban 2500 ?

Only the 2007 Suburban and Yukon XL 2500s have the 4-speed. The rest have the 6-speed.

 

[avalonandl]

Need exhaust ideas. I’ve got a magnaflow on My 04 but the drone is crazy

Also how much bigger of a tire could I fit with the 16” rim ?


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I would recommend a Flowmaster Big Block Muffler- they sound mellow. Magnaflow's do drone.

Stay away from oversize tires on the stock rims. They are narrow- 6.5"

 

[DaRosa218]

Yep, 4L80E (MT1)

My 2007 Yukon XL 2500 runs 150-170 and has the 4L80E like you. 205 is a little warm, check for the possibility of a obstructed cooler line for the trans.

 

[DaRosa218]

I would recommend a Flowmaster Big Block Muffler- they sound mellow. Magnaflow's do drone.

Stay away from oversize tires on the stock rims. They are narrow- 6.5"

Flo-Pro Big Oval, Part#2505. The inlet of the muffler is offset from the factory. flo-Pro accommodates for this and is specifically built for our trucks. Also, I have a leveling kit and run 285/75/16's without an issue.

 

[swathdiver]

My 2007 Yukon XL 2500 runs 150-170 and has the 4L80E like you. 205 is a little warm, check for the possibility of a obstructed cooler line for the trans.

That's right. When GM Tech's use the TransFlo machine, there is a setting to test the flow rate of fluid through the lines to the transmission cooler. Apparently, they do indeed get clogged and need replacing after a time.

 

[Nap73]

My 2007 Yukon XL 2500 runs 150-170 and has the 4L80E like you. 205 is a little warm, check for the possibility of a obstructed cooler line for the trans.

Appreciated I’ll have the mechanic check that out.


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