Motor mounts are not lining up, what did I miss

[binford]

I installed some LSX adapter plates, then some stock motor mounts.

The transmission is line up dead center in the middle of the cross member.

The issue is the motor mounts don't line up. One side is off by 3/4"

Yes I'm new to all this LS swap, but I can fab stuff as needed.

Passenger side


Driver side


Engine placement


Thanks in advance!

[mongocanfly]

what year truck?
what engine was in the truck before the swap?
what motor mounts did you use?
what swap plates did you use?

[binford]

Originally Posted by mongocanfly

what year truck? C20 1971
what engine was in the truck before the swap? 350
what motor mounts did you use? Original frame mounts, with some original style motor mounts
what swap plates did you use? LSX Innovation plates.

The motor mounts are Prothane for a stock 350.
The new engine is a 2006 LQ4 with the 4L80e trans

[binford]

I called a friend who is a mechanic. He came by this afternoon and with some extra muscle we were able to get it lined up to the factory holes.
He said its not always easy to line up the motor mounts. Having a second pair of eyes helped too as I could push and pull and he could watch the holes line up.


Thanks.

[mongocanfly]

Good deal...I used the clamshell mounts on mine, but didnt have any issues.....mine just dropped right in..

[binford]

After my buddy left, I got thinking this would be a pain another day, so why not fix it why I have access.

I pulled a bolt and used a die grinder to open the frame bracket. Once I pull the bolt it was only off by 1/16 or so.

The bolts drop in and sit straight now. I think I would run run 1/4" or 5/16" steel LS mounts to solve this problem next time. The 3/8" pushes the bracket over to much.





On to the next issue LOL