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Re: Left front end has dropped on 1987 Nissan Truck
Vfdf4: your truck has a torsion bar suspension. This is why you don't see any springs. Depending on the amount of drop you are talking about, there is some degree of adjustment to correct ride height. If you look under the truck closely at the lower control arms, you will notice that there are long steel rods roughly 11/4 inches in diameter which attach from the rear of the control arms and go approximately to the back end of the transmission where they have what appears to be a small arm coming off each one. There are bolts going thorough each one with locking nuts. By drawing the bolt towards you, it will raise the vehicle.
If there is no significant difference, a few inches the adjustment can be made. HOWEVER, before doing this, check the following. Make sure all the tires are the same size or at least, the tire sizes are the same size on both sides in the rear and the same size on both sides in the front although they may differ in size between front and rear. The tires ideally should be the same brand, same tread and roughly same amount of wear. Set the tire pressures equally. Check the distance between the rear axle or control arm and the body on both sides to confirm that the problem is not sourced from the rear. The distances should be the same on both sides. It is not uncommon for a sagging front end to be diagnosed as a front end problem when it is in fact coming from the rear OR the vehicl has a load which has not been taken into account.. Once you are satisfied everything is correct, at that point you can make the adjustment. You can determine the distance from under the truck by looking at the distance of the top of the front control arm in relation to the snubbers on the frame.
NOTE: The truck must be on the ground sitting in a laden position, no load in the bed or interior. Ideally it should have the front wheels on radius plates which allow for full and unrestricted movement of the front suspension during the adjustment. If you don't have radius plates, you can use a thick piece of cardboard and wheel bearing grease spread on the under side of the cardboard which will sit on the floor. The floor must be fairly smooth or this little trick won't work. If you have to draw up more than 40% of the total distance of the adjusting bolt, the torsion bar is too far gone to use.
I have seen plenty of people **** them up further, but have not known if they have had lasting effects. The front end must be aligned. This answer has been supplied by mybunkey, a Nissan master tech from the old school. I hope I have answered your question sufficiently.
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REMOVE REAR SEAT AND PACKAGE SHELF TO GAIN ACCESS TO THE UPPER SHOCK ATTACHING NUTS.REMOVE UPPER ATTACHING NUTS. RAISE VECHICLE REMOVE REAR WHEEL AND SUPPORT THE LOWER CONTROL ARM WITH A JACK REMOVE LOWER SHOCK ABSORBER MOUNTING BOLT. REMOVE SHOCK ABSORBER ASSEMBLY FROM THE VECHICLE. COMPRESS THE COIL SPRING WITH THE PROPER SPRING COMPRESSOR TOOL. REMOVE CENTER RETAINING NUT HOLDING THE UPPER MOUNTING INSULATOR. SLOWLY DECOMPRESS THE COIL SPRING.REMOVE THE MOUNTING INSULATOR AND THE COIL SPRING. REMOVE THE COIL SPRING. TO INSTALL COMPRESSED COIL SPRING ONTO THE STRUT ASSEMBLY. BE SURE TO THE END OF THE SPRING IS IN THE NOTCH ON THE LOWER SEAT.INSTALL UPPER MOUNTING INSULATOR. YOU WILL NEW LOCKNUT FOR THE CENTER RETAINING NUT OF THE COIL SPRING. CENTER RETAINING NUT AND TORQUE THE NUT TO 13 TO 17 FT LBS. SLOWLY REMOVE THE SPRING COMPRESSOR TOOL. INSTALL SHOCK ABSORBER ASSEMBLY IN THE VECHICLE AND INSTALL THE MOUNTING FASTERNERS AND TORQUE LOWER MOUNTING BOLTS TO 72 - 87 FT LBS. INSTALL WHEEL.LOWER VECHICLE. WARNING COIL SPRING UNDER EXTREME LOADS WHEN COMPRESSED.BESURE TO PROPERLY ALIGN THE SPRING WITH THE COMPRESSING TOOL TO PREVENT PERSONAL INJURY FROM THE SPRING RELEASING UNEXPECTEDLY.
Raise and support the front of the vehicle safely using jack stands.
Using an open end wrench, hold the shock absorber upper stem to prevent it from turning, then remove the upper stem retaining nut, the retainer and rubber grommet.
Common front shock absorber mounting-2WD vehicles
Remove the shock absorber-to-lower control arm retaining bolts and lower the shock absorber assembly from the bottom of the control arm.
Inspect and test the shock absorber; replace it, if necessary.
Fully extend the shock absorber stem, then push it up through the lower control arm and spring so that the upper stem passes through the mounting hole in the upper control arm frame bracket.
Install the upper shock absorber nut and tighten to 100 inch. lbs. (11 Nm) on 1994 models 145 inch lbs. (16 Nm) on 1995 models, 54 ft. lbs. (73 Nm) on 1996 models, or 106 inch lbs. (12 Nm) on 1997-99 models while holding the stem with an open end wrench. Be careful not to crush the rubber bushing.
Install the shock absorber-to-lower control arm retaining bolts and tighten to 20 ft. lbs. (27 Nm) on 1994-95 models and 54 ft. lbs. (73 Nm) on 1996 models, or 22 ft. lbs. (30 Nm) on 1997-99 models.
Remove the jack stands and carefully lower the vehicle.