That’s the thing, the distance between the spring hangers on a 40 are a lot shorter then a 45/75. What are the lengths of your arms when fully collapsed?
So I’ve been wanting to do this since I put my lifts up (I have three Challenger 10k’s) three years ago, decided to finally try it on my front lift that sees the most regular use
My long arms were 38” long, I cut 8” off of the outer arm and left the inner arm as-is, it still fully collapses...
If you’re only working on your own vehicles, you could paint tire locations on the floor
I am going to be shortening my longer lift arms by a few inches to help with 40’s and 60’s odd frame dimensions.