Another note on coining. There was a TSB sent out by Chrysler in the late 80s and renewed as late as 1993 involving vibration from improperly centered wheels on models with coined wheels and shouldered lug nuts. The "fix" was to issue all D350 owners 2 conical lug nuts to use during tire changes. The sequence, IIRC, was to put the conical nuts opposite one another and tighten to 50 lb-ft. Put 6 shouldered lug nuts on, tightening to 50 lb-ft. Replace the two conical nuts with the shouldered nuts, and tighten to 50 lb-ft. Then properly tighten all of them, in sequence, to 300 lb-ft.
Because of this, I purchased 2 conical lug nuts from O'Reilly's and keep them in the glove box.
NM, I found the TSB.
Date: Apr. 6, 1992
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 22-01-91 REV. A WHICH SHOULD BE REMOVED FROM YOUR FILES.
Models:
1989-1992 (AD) Ram Pickup/Ram Cab & Chassis
Power Ram Cab & Chassis
THIS BULLETIN APPLIES TO 350 SERIES AD MODELS WITH FLANGE TYPE LUG NUTS.
Symptoms:
A customer complaint of a wheel and tire vibration, at highway speeds, on smooth road surfaces. This condition may be caused by the wheels being off center on the wheel studs.
Diagnosis:
A properly centered wheel will have a balanced amount of space for each lug nut flange to the wheel center hole; an off center condition will show a variable amount of space. Perform a visual inspection and road test vehicle to verify condition.
Parts:
2 90° Cone Nuts 1273556
Repair Procedure:
This repair involves wheel centering procedure.
1. Raise the vehicle so that the tire(s) are off the ground. Do not remove the wheel(s) from the vehicle.
2. Loosen all lug nuts. Remove two (2) of the flange nuts 180* apart (do not discard). Use the positions with the largest flare surface for cone nut contact.
3. Replace the two (2) flange nuts with the 900 cone nuts, PN 1273556, and torque to 68 N-m (50 ft. lbs.).
4. Some loosening and tightening of the cone nuts and repositioning of the wheel might be necessary to obtain a centered wheel.
5. When centered, tighten the six (6) flange nuts and torque to 68 N-m (50 ft. lbs.). Replace the two (2) cone nuts with the flange nuts that were previously removed and torque to 68 N-m (50 ft. lbs.).
6. Torque all the flange nuts to 407-475 N-m (300-350 ft. lbs.) in an alternating pattern, Figure 1.
Wheel Lug Nut Tightening Pattern
Figure 1 link:
http://dodgeram.info/tsb/1992/figures/22-02-92-f1.gif
7. Visually verify to see if the wheel is centered properly. Check tire air pressure to make sure it is properly inflated.
8. Repeat the procedure as necessary to assure all wheels are properly centered.
9. Road test vehicle to confirm your repair.
AS A COURTESY TO THE CUSTOMER, PLEASE PROVIDE THEM WITH THE CONE NUTS FOR FUTURE USE (EX. TIRE OR WHEEL REPLACEMENT).
NOTE: THE CONE NUTS SHOULD BE USED TO CENTER ALL WHEELS, FRONT OR REAR.
Notes:
POLICY: Reimbursable within the provisions of the warranty.
TIME ALLOWANCE:
Labor Operation No. 22-40-01-93 . . . . . . . . . . . 0.3 Hrs.
FAILURE CODE: 51 - Improperly installed
