Don't know if this helps
Photos from harrop's instructions/ install booklet that came with my sports diff cover
And yes the harrop diff cover has pretty much got rid of my axle tramp.
I haven't got the alignment checked.
I did mention it to pedders but they picked a heap of other stuff needed fixing.
I went away and have since done rear CVs front struts and most bushes in the front.
I went to O'Neils to get wheel alignment, he seemed to know nothing about the subframe alignment and just did a normal wheel alignment.
Might try pedders again or have to try Holden.
From this link
https://www.google.com.au/url?sa=t&source=web&rct=j&url=https://www.ls1gto.com/forums/showthread.php?t=179799&ved=2ahUKEwiA1q7i0azdAhWSd94KHSVoAJ4QFjAWegQIABAB&usg=AOvVaw3Oso0OjrStgWkoWuK5asN9
I've been doing rear suspension upgrades and believe this
IS possible as a DIY. The
manual has illustrations of the alignment
tool and how it fits into holes in the body near the subframe bushings, and into smaller holes in the subframe itself, further aft & maybe a little inboard. The body holes are 19mm and are easy to find, they're between two big elongated holes in a pseudo "frame rail". My subframe has two sets of holes in the angled arms, I'm not sure which set the alignment tool uses, but I don't think it matters...I'll come back to that. I threaded a tape measure from the body hole, above the
exhaust pipes, below the
driveshaft (doesn't touch), and over to the subframe holes on the other side. Then switch to the opposite set of body holes and subframe holes and re-measure. It's not a perfect measurement because the tape has to go slightly up & over the exhaust, but it does the same amount of up & over both ways, and the measurement is mostly lateral - just compare measurements to see if the subframe is centered. Here's what I got after putting in new subframe bushings and diff insert:
Forward set of subframe holes: 36-15/16 (to near edge of subframe hole), L>R
and R>L, 37-1/2 (to far edge of subframe hole), L-R & R-L
Aft set of subframe holes: 36-even (to near edge of subframe hole), L>R
andR>L, 36-9/16 (to far edge of subframe holes), L-R & R-L
I had the tape hooked into the 19mm body holes, and used one hand to make sure it was seated all the way in (not slipping down any). The attachment is a rough diagram of what I was measuring, except I have a 2005 that doesn't have
mufflers in the way. I don't think this would work on a 2004, sorry first-year guys!
I'm thinking I've got my subframe on center, within no more than a sixteenth, based on a total of eight measurements. What do you think? I've torqued my TTY bolts, but haven't done the "yield" step yet. If someone finds the fatal flaw in this approach, I will take it in to the dealer, but I think I've already got it centered.
I might add the handling of mine seems good