1998 GMC K3500 7.4L vibration

Glenn Briglio · 05-30-2021, 08:04 PM

Did you check the transmission mount and driveshaft while your at it.

Mark Ugrich · 06-03-2021, 07:44 PM

Just a thought, but did you try unbolting the torque converter and running the engine?

Mark Ruset · 06-06-2021, 02:27 PM

I recall a GM service bulletin that addressed engine vibrations, It had to do with adding a shim type spacer between the block and mount. I believe the issue had to do with alignment of the motor mounts. I don't recall what years it was related to. On another note make sure that the motor mount bolts going into the block are not bottoming out before the mount is completely tightened,

05-30-2021, 08:04 PM	#1
Glenn Briglio VIP Member Join Date: Nov 2002 Location: Massapequa Park,NY Posts: 1,281 Likes: 1,890 Liked 969 Times in 307 Posts	Re: 1998 GMC K3500 7.4L vibration Did you check the transmission mount and driveshaft while your at it. __________________ 1989 Camaro Iroc-Z I/SA B&B Auto Machine Shop.

06-03-2021, 07:44 PM	#2
Mark Ugrich Member Join Date: May 2011 Location: Auburndale,Florida Posts: 220 Likes: 29 Liked 71 Times in 38 Posts	Re: 1998 GMC K3500 7.4L vibration Just a thought, but did you try unbolting the torque converter and running the engine?

06-06-2021, 02:27 PM	#3
Mark Ruset Member Join Date: May 2006 Location: Southwest Florida Posts: 263 Likes: 35 Liked 43 Times in 29 Posts	Re: 1998 GMC K3500 7.4L vibration I recall a GM service bulletin that addressed engine vibrations, It had to do with adding a shim type spacer between the block and mount. I believe the issue had to do with alignment of the motor mounts. I don't recall what years it was related to. On another note make sure that the motor mount bolts going into the block are not bottoming out before the mount is completely tightened, __________________ Mark Ruset 2048 STK

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