Which Motor Mounts

[DragonSlayer1]

Hi All: Which motor mounts would you suggest for 2008 AWD GMC Yukon 6.2L. From what I'm hearing the stock ones are not being suggested.

Thanks

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

It is my understanding that the OEM motor mounts for your truck have a fluid-filled shock absorber built into them to reduce engine vibration in the interior, but in time, that shock absorber ruptures. I believe that some folks replace the OEM motor mounts with Hummer H3 motor mounts.

Other folks will chime in.

 

[donjetman]

Hi All: Which motor mounts would you suggest for 2008 AWD GMC Yukon 6.2L. From what I'm hearing the stock ones are not being suggested.

Thanks

Hummer motor mounts (2), GM# 25847739

 

[DragonSlayer1]

Thank you!

 

[swathdiver]

Hi All: Which motor mounts would you suggest for 2008 AWD GMC Yukon 6.2L. From what I'm hearing the stock ones are not being suggested.

Thanks

If you don't want any engine vibrations and don't dog the motor all the time, the factory fluid filled mounts are fine. But if you want something more durable and don't mind a little engine vibration at idle, the H3 mount that Don posted is the way to go. I run them both on mine. The Yukon gets the stock mounts and the 6.2s get the Hummer mounts!

 

[DragonSlayer1]

Thank you for the info. A large majority of the use of this Yukon 6.2 will be pulling a 28 enclosed snowmobile trailer amongst other family outings and trips. So not my daily driver. I'm looking to try and make some improvements for engine life longevity and overall performance. Having said that I will probably go with the H3 mounts. If you have any other suggestions for must have's on these rigs I'm all ears. I have notice lower oil pressure after driving for an hour or so, but it is not consistently low - which is an issue I've read about.

Thanks

 

[swathdiver]

Thank you for the info. A large majority of the use of this Yukon 6.2 will be pulling a 28 enclosed snowmobile trailer amongst other family outings and trips. So not my daily driver. I'm looking to try and make some improvements for engine life longevity and overall performance. Having said that I will probably go with the H3 mounts. If you have any other suggestions for must have's on these rigs I'm all ears. I have notice lower oil pressure after driving for an hour or so, but it is not consistently low - which is an issue I've read about.

Thanks

Once the oil is warmed up, the pressure on the gauge will usually be just shy of 40 psi, the bypass spring on the pump is 33 psi as our oil pumps deliver 1/3 more oil per rev than an iron block motor's pump to compensate for the increased tolerances in our aluminum engines.

How many miles? 6.2s have a tendency to break the #8 or #7 valve springs at around 165K miles. We see this more often with the oldest 6.2s, the 2007-2008 L92s but have seen it on the newer ones. If the motor gets hot, like a coolant leak, they have a tendency to drop a valve when the bronze guide fell out of place. There's a guy on here right now who probably has that issue. Having said that, not everybody experiences these things.

Run the truck on the severe service schedule except for the transmission. Change the fluid if all she does is tow to maybe every 10K miles or so. You can send out samples to Blackstone-Labs for analysis.

You can also beef up the valve body in the transmission and consider putting in a more stout torque converter. Not a higher stall, just stronger and improved parts. The weak link in our drivetrain is not the transmission but the torque converter.

You can check out Seth's upgrades to his Cadillac's transmission here:

6L80 Sonnax ZIP Kit, Pressure Switch rebuild, remote filter install, and fluid flush in 2013 Escalade ESV (Pic heavy)

Hello Gentlemen, Over the past few days, I have completed the following work to the 6L80 transmission in my 2013 Escalade ESV: -rebuilt the TECHM pressure switches using Sonnax parts -installed most of the Sonnax ZIP kit in the valve body -replaced the filter -installed a new pan with a drain...

www.tahoeyukonforum.com

 

[DragonSlayer1]

The rig has 139K miles on it. Any idea how I would know if a valve spring is broken?

Thank you for the info.

 

[Geotrash]

The rig has 139K miles on it. Any idea how I would know if a valve spring is broken?

Thank you for the info.

Yep. You would hear the piston fighting for territorial rights with a valve in one of those cylinders. It will be a short-lived dispute too, being settled in a matter of minutes or less.

 

[DragonSlayer1]

Hum. So would you suggest just replacing all of the valve springs to prevent a failure?