Buy 1991 Gmc K1500 Sierra Standard Cab Pickup Fleetside 5.0L Chevrolet V8 M/T Engine Mount. 5.0 & 5.7 - OEM Gmc Part # 15592505

Mount. Engine. Motor.
A part that locates and supports the Engine. It also reduces vibrations from the Engine.

Engine Mount

5.0 & 5.7 LITER, 4WD. 5.7 LITER, 4WD. 5.7 LITER, 4WD, 1/2 ton. All Models; 4WD.
Engine Mount - Repair or Replace
A broken or worn engine mount will often cause your 1991 GMC K1500 to lurch when shifting gears, and you may also hear a clunk when accelerating or braking. Another likely symptom is excessive vibration from your engine.