Don't just buy 'longer shocks', measure what you have and buy what you need, the right part. Look at MFGs web sites for their product specs to find the right number to buy.
With the truck in the driveway:
0) make sure you have adequate bump stops to prevent tire/metal contact.
1) Measure the top to bottom mounting point distance (ML).
2) Measure he gap between the axle and the bump stop (BSG).
3) Buy a shock with the compressed length equal to ML-BSG-1/2".
The extra 1/2" will ensure the shock is not the limit on compression (bad). The max droop will just be what it is. If you want more droop, move the mount points further apart (make ML longer).
'93 YJ, '02 GM 4.3V6, SOA, dual ARB's, 8.8+D30(WarnHubs), 4.88s, 35" BFG KM2s, AX15, NP231+4:1+SYE+2LO, York OBA, Warn M8000.
Web Admin for New Mexico 4 Wheelers My Truck Page on NM4W Site