:rules: :thankyou2:
I was assuming if it wasn't intentional altering of components it would be OK, just wanted to make sure. The other reason I bring it up is in the NADM's rulebook it states under the Wheelbase rule that vehicles must retain factory wheelbase and track width. I'm sure that rule was made to keep from swapping SRW and DRW axles from one to another, but by the letter of the rule, there are several lift manufactures for IFS GM's that increase track width by as much as 3" in the front, and there are some who run a 1/2" spacer on each front wheel to keep offset rims from hitting the control arms.....both of which increase the WMS distance but not intentionally to gain an advantage. Tech's decision would be good for this.
Outlaw99: Yes certain lift manufacturers springs pull the axle forward as they use too short of a main leaf or use a stock main leaf and then arch it (distance from vertical spring centerline to front spring hanger vertical centerline decreases causing the axle to "move forward"), but there are other companies (Deaver for one) that take that into account and use a longer or flatter main leaf that keeps the axle centerline at OEM spec.
The issue I have seen is those that use a non-conventional leaf pack (like from another manufacturer or different application) and it causes issues. GM primarily used a main leaf with the "centering pin" dead center, whereas Ford used a spring that the centering pin was favored toward the front. Some have run them to gain spring rate and accidentally changed their wheelbase (some for better, some for worse)....
Regardless of who, what, when, where, and why, a simple tape measure and 10 seconds will determine "if" anyone has an altered wheelbase....end of story.