Polys: Leave em in or take em out?

**16MustangVet** · 01-02-2010

Ive heard epoxy'd filled stock mounts are good for lower mounts also you can still get the engine to lean for changing plugs and room on the back.

**98gtp** · 03-24-2011

I installed a energy suspension lower engine mount

Some drilling is required as well as shims (oversized nut and some washers) but I installed a energy suspension mustang transmission mount as the lower engine mount (4.1104), and may try the same for the transmission mount with a gm trans mount (3.1108) which is smaller than the mustang mount.

For the engine mount I used shims to bring up the base to the same elevation as the origonal bolt holes, just bolted down to the bottom pan of the engine mount (2 holes drilled) I also drilled out 2 holes matching the upper's spacing as well to allow me to ream out one hole, and offset the other allowing the poly mount to be easily replaced if required for future use/ replaced by the same style rubber mount if I didn't like the feel. (modifications were done to the car not the poly mount)

I can still rock the engine for replacing sparkplugs, just takes a little more effort.

I Would try epoxy filling your newer lower engine mount if it does fail, or your older one if the rubber is in good shape.

**SlowRR** · 03-24-2011

Sounds crazy but check howb you exhaust is held to the car. I have poly mounts and had no vibration issues till I got my exhaust redone. What was causing my vibration wasn't the mounts but the guy I had do the exhaustb work welded supports directly to the frame with no ruubber isolators. Vibrated like nothing else.