Hey guys I’m swapping in a 5.3 with a 4L60e in my 89 with a 9 bolt stock rear end and my driveshaft seems to be about an inch too long. Anyone run into this before? I’m using the hawks lsx motor and trans mounts. I don’t get it

 

I had to shorten my LS1 driveshaft by 2 inches. However, I am running the non F-Body tremec magnum. It is not uncommon to have to do this.

 

thanks. Usually this is not an issue with an F body 4L60e but I do have the 9 bolt rear so I’m wondering if that’s my issue. Might have to look into shortening the shaft

 

are you using the 1 inch recessed engine mount brackets??

 

I’m using the hawks engine mounts

I’m using the hawks mounts with F Body clam shells

 

They dont look set back an inch, may have to shorten the drive shaft or get the mounts that move engine forward 1 inch

 

Yeah I’m thinking I need to shorten the driveshaft

 

It's hard to tell from the pictures, but it looks like your motor mounts are on the wrong side.
This will move the engine back from where it should be.


See how the longer part of the mount insert is towards the rear.

 

You think the clam shells are on the wrong side or the brackets?

 

Clam shells... refer to the picture I posted.

 

Oh ok I see. So your thinking this clam shell is upside down basically

cally

 

Verify that your mounts are different side to side...
I have been looking for a better photo, but mine appear to be opposite of yours with the extended length side facing the rear.
This would move your engine forward if this is the case.