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Re: 57 GMC, frame swap, 4wd, 454 big block, 4 speed
I knew the poly mounts would be stiffer and I would feel the engine running a little more, but I had no idea that it would cause that big of a vibration going down the highway. I guess at that speed and rpm, it was where there was some harmonic vibes with everything I have working together, and they transferred it into the frame and I could really feel it. I know now not to use poly mounts.
Yes, the new shaft with the double joint and large tube was going to cost over 900 bucks. I was sure glad he told me to change the mounts first, and see what that does.
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