LBZ: ProThane Body Mounts

[fajitatone]

So I replaced the stock, worn, body mounts with ProThane mounts and did the GMT900 rear mounts. While the "Chevy Shake" at 40-45 MPH is gone, the noise in the cab is louder, but WOW the vibrations at idle. Especially when cold. I know that polyurethane is stiffer than rubber, but is there any way to quell the vibrations?

 

[HWI]

You are stuck with the vibrations with Prothane mounts. Go with some Dorman mounts or wait for the S&B mounts to come out. I replaced my rears with the GMT900 mounts as well, biding my time on the other ones until the S&B mounts are released.

 

[gmduramax]

So I replaced the stock, worn, body mounts with ProThane mounts and did the GMT900 rear mounts. While the "Chevy Shake" at 40-45 MPH is gone, the noise in the cab is louder, but WOW the vibrations at idle. Especially when cold. I know that polyurethane is stiffer than rubber, but is there any way to quell the vibrations?

Have your rotating assembly balanced

 

[Bdsankey]

You are stuck with the vibrations with Prothane mounts. Go with some Dorman mounts or wait for the S&B mounts to come out. I replaced my rears with the GMT900 mounts as well, biding my time on the other ones until the S&B mounts are released.

Whats the details on the GMT900 rear mount, is there a quick "how to" that I should reference? My crew cab shakes like a MOFO inside above 40mph and it isn't driveline related, it's like a resonance.

 

[Chevy1925]

So I replaced the stock, worn, body mounts with ProThane mounts and did the GMT900 rear mounts. While the "Chevy Shake" at 40-45 MPH is gone, the noise in the cab is louder, but WOW the vibrations at idle. Especially when cold. I know that polyurethane is stiffer than rubber, but is there any way to quell the vibrations?

nope, the poly bushings put a ton of noise/vibration into the cab. i have a thread on here about when i did mine. I made it two days and fricken hated them.

i wound up putting dorman mounts in every mount and sold the poly's off. So far, they are holding up with 0 sag after 2 years.

 

[fajitatone]

Have your rotating assembly balanced

Mostly feel it while stopped.

 

[N2BRK]

Mine vibes more with Merchant driver's side engine mount and trans mount. My buddy's LMM too. I can't imagine all poly. Although, mine vibes a ton less than his - might be my Fluiddampr helping.

 

[zakkb787]

You are stuck with the vibrations with Prothane mounts. Go with some Dorman mounts or wait for the S&B mounts to come out. I replaced my rears with the GMT900 mounts as well, biding my time on the other ones until the S&B mounts are released.

Saw a garage I follow post about putting the S&B mounts in a Ford and thought it was a typo till I looked. Pretty neat. Always nice to see new options for products from a trusted brand

 

[fajitatone]

You are stuck with the vibrations with Prothane mounts. Go with some Dorman mounts or wait for the S&B mounts to come out. I replaced my rears with the GMT900 mounts as well, biding my time on the other ones until the S&B mounts are released.

Any idea when this may be? I have to do engine mounts too. Should I do Merchant or somebody else?

 

[Chevy1925]

Stock mounts with a bolt through them.

 

[Pure Diesel]

Sorry to go off subject, but will old but not broken motor mounts cause a buzzing/vibration through the brake and accelerator pedals?

 

[TheBac]

IMO, using urethane for body mounts is foolish unless its a drag or pull truck only. Urethane has way too little "give", and you dont want that between body and frame. The ride quality will suck badly.

 

[HWI]

Whats the details on the GMT900 rear mount, is there a quick "how to" that I should reference? My crew cab shakes like a MOFO inside above 40mph and it isn't driveline related, it's like a resonance.

They are a straight replacement, no need to mod anything at all.

Any idea when this may be? I have to do engine mounts too. Should I do Merchant or somebody else?

No idea when they are coming out, I've been waiting for about 6 months now. On their website it just says coming soon.
For engine mounts I would just bolt the stock style, that will keep it from pulling apart and keep the vibrations to a minimum.

 

[Bdsankey]

They are a straight replacement, no need to mod anything at all.

Yeah I was reading that, looks like the only part I need to locate is the other body mounts so I can change them all.