I want to have the diff shortened 30mm (15mm each side to retain shock mount) so later I can get custom 15” GTS rims made and get max dish.
What i’m Struggling to understand is what offset and back spacing will I require to maintain wheel track (my engineer is allowing me to use LH - UC or A9X rear track).
I’m going to try placing my 14” gts rims on a stock UC diff (studs removed) and measure from Center to center of each rim, repeat this for stock 15x7 gts rims to compare then subtract 30mm from that measurement and see if it falls within the stock and max track width (stock wheel track is 25mm less than max length).
Is there a easier way I can do this?