i dont want all the stress on one mount, yes i know people run it and they've been "fine".
ask Planman about his setup actually, i think he runs like 4"
I currently run 4.5" springs with no body lift, Currie 60s, 99" wheelbase (3" stretch), about 4" rear and 4" front extended bumpstops, relocated lower shock mounts, 12" front and 10" rear Fox adjustable shocks with about 1/2 up and 1/2 down travel, Currie flipped drag link, 3 link rear and 4 link front (plus trackbars), and 40s on 3.5" backspaced wheels.
After EJS, I plan to install a set of 3.5" progressive rate Metalcloak springs.
If you high steer the front, you are looking at close to 4" front extended bumpstops. So, without notching the frame, I'd say 3" is probably the shortest spring you'd want to do on an aftermarket 60.
I have a set of Y-link radius arms Trailmaster sent me for the front. They are very similar to the TnT ones on Rex, but they use Rock Krawler joints instead of Summit Machine.
Seeing how Rex works, I've been tempted to run the Y-Link arms, but am torn between those and switching to a 3 link front. Rock Krawler has a strong double sheer 3rd link upper arm design available, or I could build it into a truss.
The 3 link binds less. The Y-link allows a very flat frame side mount that is difficult to do with a 3 or 4 link and keep close to parallel front upper and lower arms. The Y-links seem to handle fine with the flex joint at the frame and a heim at the short arm--plus my front upper axle side are Currie joints.