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i,m in the process of doing a frame off rest. i put the motor and trans. back on the chassic but i had to make the slot longer on the trans. mount so i could bolt it to the frame mount, trans. and engine mounts are both new,it sits about a quarter to a half inch to far back to enable me to bolt it down where it suppose to go. the frame is not bent , because i took the same motor and trans. off the frame. i even brought two trans mounts from diff. vendors to see if that was the problem, no luck. As far as i know the bolt patterns on the motor mounts are the same or am i wrong, they don;t look like the mounts are offset i hope i explained it right, sorry i forgot i,am working on a 65 coupe thanks
i have the motor and trans. bolted down by the hardest, but it is just not exactly right, everything needs to go forward a little. i can't try my old mounts because one of them are split in half, but when i place the new mounts next to the old one, they look exactly the same, as far as i know there is no diff. in the mounts just so it is chev mounts, or am i wrong. i am putting the same motor and 4 speed back on , i just rebuilt the two. this might not be a problem but just like in my bussiness if u start something wrong it will come back in the end and kick u in the butt. thanks
i can't try my old mounts because one of them are split in half, but when i place the new mounts next to the old one, they look exactly the same, as far as i know there is no diff. in the mounts just so it is chev mounts, or am i wrong.
All the first generation V-8 mounts are not created equal. Some that look the same can be thicker or taller or relationships different between the vertical/horizontal holes and they won't interchange. This causes a problem up/down or side/side. I've never seen it cause a fore/aft problem. I've had the above problems before but I can't tell you the specific differences between the mounts.
Raise the front of your engine off the frame and change out the good remaining old mount. Drop the engine back down a little and see if it will align with the frame mount. If it does align, I'd be pretty confident you have a mount problem on the engine with your replacement mounts.