Broken Motor Mounts

[jrobie79]

Do you notice a harsher ride with the Hummer one? I just replaced nearly my entire front suspension on my escalade, with the magnetic ride control struts, I'd hate to swap motor mounts if its gonna make the ride harsher.

 

[CobraKing]

Do you notice a harsher ride with the Hummer one? I just replaced nearly my entire front suspension on my escalade, with the magnetic ride control struts, I'd hate to swap motor mounts if its gonna make the ride harsher.

Try to see if you can get a ride in a '13-'14 Tahoe PPV (but don't break the law) as they use the same engine mounts.

I have a '14 PPV (purchased with 200K Km) on it and when I was test driving the vehicle at the lot, one of the things I was looking for was excessive engine movement after reading about the premature failure that alot of you are experiencing.

The NVH on the truck is acceptable to me, but then again the PPV sits lower and has a stiffer suspension than a regular Tahoe so the latter 2 factors might be masking the NVH.

Sometimes at idle I do a feel rumbles/vibrations in the cabin but that could be due to OEM sparks and the overall high engine mileage on my truck.

 

[Rocket Man]

Anybody know if these fit the Silverado/ Sierra's?

 

[NathanJax]

Anybody know if these fit the Silverado/ Sierra's?

Y U NO READ POST...




I just did it to my Silvy 2 weeks ago....

 

[Rocket Man]

Y U NO READ POST...




I just did it to my Silvy 2 weeks ago....

Oh...37 pages and I'm pretty sure I read it all but I was just being a ****** since I didn't have a NNBS but as you know things changed recently. Plus I'm old and can't remember shit lol. Thanks. It's good to know in case mine breaks.

 

[NathanJax]

Oh...37 pages and I'm pretty sure I read it all but I was just being a ****** since I didn't have a NNBS but as you know things changed recently. Plus I'm old and can't remember shit lol. Thanks. It's good to know in case mine breaks.

 

[bnjalal]

Long time lurker, well not too long but ....
Anyway, in case anyone is still wondering if the hummer's fit on NNBS tahoe, 2007 4wd, they do and ill upload the pics in a day or two

Posted this to be another one who verifies and will confirm with engine bay pics
Not sure how the truck ride's now as its still with the mechanic for tune-ups and stuff, but im excited that I've got those new mounts

Thanks everybody who shared their knowledge and also @windog for shedding light on the part number

I've been watching these motor mount threads for a while and I'm amazed that those of you who've had your mounts replaced especially at a dealer are still using production mounts. I work for a police vehicle fleet with almost 200 Tahoe's. GM put out a bulletin in like 2008 for a heavy duty replacement mount that does not have fluid in it. Part number 25847739. It does not show up when the parts guy looks up a mount so I can't blame them but the service dept. should have access to it. We have replaced almost every left side mount in the fleet with these and had zero failures. Police drive these things far harder than probably any of you and no failures. Just ask the parts dept. to order this number.

 

[4myfreedom]

Yeah going to get them for my 2008 Avalanche replaced two already PN 25847739

 

[Krmnnghia]

I thought I would post this vid I made of my Engine mount doing its thing...or not doing its thing I should say.

Have some strange random drive line clunks during shifts and I think this is the cause.

 

[2010WhiteHoe]

Yeah going to get them for my 2008 Avalanche replaced two already PN 25847739

This my same problem. I'm just trying to decide between the Hummer mount or the OEM.

 

[NGAneer]

I thought I would post this vid I made of my Engine mount doing its thing...or not doing its thing I should say.

Have some strange random drive line clunks during shifts and I think this is the cause.

Looks broke to me. Mine moved a little bit more but it had bent the steel bar inside the mount that held the two halves together.

 

[miatawnt2b]

I thought I would post this vid I made of my Engine mount doing its thing...or not doing its thing I should say.

Have some strange random drive line clunks during shifts and I think this is the cause.

yep, that mount is toast.
At this point there would be no way I'd go with the OEM mount. replace it once with the Hummer mount and forget about it.

 

[jonathan_furman]

So if I want to replace both drivers side and passenger side mounts go with (25847739) hummer H3 mounts?
should I get 2 of them or what I'm confused and there is so much on this thread that its hard to get straight.

 

[Rocket Man]

So if I want to replace both drivers side and passenger side mounts go with (25847739) hummer H3 mounts?
should I get 2 of them or what I'm confused and there is so much on this thread that its hard to get straight.

Yes. It fits both sides and that's the ones you want to use.

 

[swat2380]

Here are the specs from both part #'s first one is what we all have been dealing with second one is the H3 specs.

 

[Rocket Man]

Here are the specs from both part #'s first one is what we all have been dealing with second one is the H3 specs.


View attachment 196506 View attachment 196507

Those specs don't make sense. The top one says stud thread diameter is 1.5"/ .059 mm and the bottom one says 1.75"/ 1.75 mm. Something doesn't add up.

 

[NGAneer]

Those specs don't make sense. The top one says stud thread diameter is 1.5"/ .059 mm and the bottom one says 1.75"/ 1.75 mm. Something doesn't add up.

Agreed, but I don't recall a "stud" on the mount other than the frame locator. Someone's done this any said it worked, right? I remember seeing that it was good to go.

 

[Rocket Man]

Agreed, but I don't recall a "stud" on the mount other than the frame locator. Someone's done this any said it worked, right? I remember seeing that it was good to go.

Yes it's been verified to work on both sides, SUV's and pickups. Quite a few guys have installed it.

 

[NGAneer]

Yes it's been verified to work on both sides, SUV's and pickups. Quite a few guys have installed it.

That's what I thought. Just another example of published specs not always matching the real thing.

 

[bnjalal]

Long time lurker, well not too long but ....
Anyway, in case anyone is still wondering if the hummer's fit on NNBS tahoe, 2007 4wd, they do and ill upload the pics in a day or two

Posted this to be another one who verifies and will confirm with engine bay pics
Not sure how the truck ride's now as its still with the mechanic for tune-ups and stuff, but im excited that I've got those new mounts

Thanks everybody who shared their knowledge and also @windog for shedding light on the part number

My sincere apologies for taking a long time to update, i hope those may clarify any doubts, engine is a 5.3, nnbs, 2007 tahoe (2007+) replaced both sides with same part number but unable to get a clear picture for passenger side

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