Which Motor Mounts

DragonSlayer1 said:

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

Click to expand...

That's what I did with my 2012, but it was part of a cam swap so I needed to change them anyway. But, fear of one failing is part of what caused me to make the investment.

Lots of folks running around with 200K+ 6.2's that haven't broken a valve spring. So, at 139K I would say the odds are still remote, and will remain so even as you cross 165K some day, but they're also not zero.

150K is a nice time to do a bunch of heavy maintenance on these. This might be one of those items. Then, enjoy for the next 150K miles.

I just replaced the OEM hydro mounts on our 09 6.2 @ 170k. Not recommended to wait that long but with AWD, it allowed $4k worth of work to be completed for $1.5k when I had the trans rebuilt.

With the trans pulled for either a 100k mi or later major service or replacement, the motor & trans mounts, front diff mount bushings and brackets and oil pressure switch are practically free labor. Did the pan gasket as well as F/R diff service too for that same $1.5k price.

One weak link in the 6.2 is that failure to replace all the drive train isolation bushings and mounts will result in short life’g the newly replaced ones mixed with old ones. We learned from our 08 YXL Denali. With the 09 6.2, the above parts were replaced with OEM GM, the same hydro mounts, all at once. We’re good for another 75k mi min now that it’s been done correctly.

Yes, you could go with Hummer mounts, but these are well worth the upgrade, since you are pulling and no worries on future leaking. These are polyurethane, so no liquid filled crap. Atomic Fabrication and Performance the way to go!

Oh and this is the guy who makes the trucool trans cooler mounts, too!!

How are you liking the poly mounts on your truck?

Trying to decide between the H3 mounts or the poly mounts. Is the vibration with the poly mounts really that bad?

12GMCYukon said:

Trying to decide between the H3 mounts or the poly mounts. Is the vibration with the poly mounts really that bad?

Click to expand...

Do the H3 mounts.. the solid poly ones have some bad reviews. H3 ones are the best
compromise between reliability and NVH.. I get just a bit more nvh with the H3's so
I bet the poly ones are fairly harsh

I got 80,000 from my OEM mounts. and I'll get 80,000 vibration free miles from the OEM oil filled replacements. Why anyone goes for solid mounts because they are worrying about 80,000 miles down the road.. ok. I won't have my truck at 80,000 miles down the road, it'll be someone else's problem. and if I do have it, ok, I'll spluge for another set of mounts.

is 80k a lot of miles? cause if I don't see 300k on this thing I'm going to be bummed.

I did them pro actively as I was adding a supercharger, beefed up trans, etc etc
I still have my 90k OE ones in a box and they are fine