This rear drive shaft we are offering fits 1983-1991 K5 Blazer/Jimmy (full size) 4x4 with automatic transmission.This shaft measures 29 1/2" from center to center of the u-joint hole.Please verify length before ordering. This new drive shaft is complete,including a new transfer case slip yoke (3R-3-9161x),3R (534G) greasable u-joints and is high speed balanced and ready to install. This Driveshaft comes with a 90 day Warranty. Warranty valid under normal use only (snowplowing, mud pulls, suspension alteration ect.) will void warranty