This is the u-joint with outside lock rings on 2 trunnions and inside lock rings on the other 2. The inside lock ring caps are 1 1/8 dia. and the outside caps are 1.065 dia. so on 88-98 applications make sure of the correct lock ring.
Fits 88-91 4WD Front of Front Driveshaft Manual, 88-90 2WD Rear w/Aluminum Shaft, 91 Rear Ext Cab 5spd and 92-98 2WD Rear Ext Cab Long Bed.