Yes, alot of people have done this. You have to truss the top of the axle to accept the brackets for the linkage. There are several options for this type set i.e.: coils, coil overs, 1/4 elliptical, etc. I've been running Proffitts 4 link set up for 2 years and it works awesome. Proffitts can hook you up. Heres their link Coil Spring ConversionsHas any one 4 linked there 40 with the original off centerd axle and t-case. If so how did you get around the off centered drive shaft and were did you mount the coil overs. Thanks any pics will help if it can be done.
I went the unconventional way and triangulated the uppers right ontop of the offset housing. In my case I have bumpstops to limit uptravel and limiting straps to save my driveshaft in droop conditions. So the difference in articulation from left to right doesn't really affect me in the range of travel I'm in right now. But yeah you can add a cradle that centers the uppers too.