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CONDITION |
POSSIBLE CAUSE |
CORRECTION |
Leak at front slip yoke
NOTE: An occasional drop of lubricant leaking from splined yoke is normal and requires no attention |
a. Rough outside surface on splined yoke.
b. Defective transmission rear oil seal |
a. Replace seal if cut by burrs on yoke. Minor burrs can be smoothed by careful use of crocus cloth or honing with a fine stone. Replace yoke if outside surface is rough or burred badly.
b. Replace transmission rear oil seal. Bring transmission oil up to proper level after correction. |
| Knock in driveline, clunking noise when car id operated under floating condition at 10 mph in high gear or neutral. |
a. Worn or damaged universal joints.
b. Side gear hub counterbore in differential worn oversize. |
a. Disassemble universal joints, inspect.
If worn or damaged, replace U-joint assembly.
b. Replace differential case and/or side gears as required. |
Ping, Snap or Click in driveline.
Usually occurs on initial load application after transmission has been put into gear, either forward or reverse. |
a. Loose upper or lower control arm bushing bolts.
b. Loose companion flange.
c. Loose double Cardan mounting bolts. |
a. Tighten bolts to specified torque.
b. Remove companion flange, turn 180° from its original position, apply white lead to splines and reinstall. Tighten pinion nut to specified torque.
c. Tighten bolts to specified torque.
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Roughness. Vibration or Body Boom at any speed.
With tachometer installed in car, determine whether driveshaft is cause of complaint by driving through speed range and note the engine speed (rpm) at which vibration (roughness) is most pronounced. Then, shift transmission to a different gear range and drive car at same engine speed (rpm), regardless of transmission gear range selected, driveshaft assembly is not at fault, since the shaft speed (rpm) varies.
If vibration decrease or is eliminated in a different gear range, but at the same engine speed (rpm), check the possible causes (a-j). |
a. Bent or dented driveshaft
b. Undercoating on driveshaft
c. Tire unbalance. [30-80 mph, (45-125 km/hr) not throttle conscious]
d. Driveshaft unbalanced of missing balance weights
e. Worn universal joints
f. Burrs or gauges on companion flange. Check bearing retainer locating surfaces on flange yoke.
g. Companion flange unbalance.
h. Incorrect rear joint angle.The angle is usually too large when it is a factor.
i. Excessive looseness at slip yoke spline.
j. Driveshaft runout [50-80 mph (80-125 km hr throttle conscious]
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a. Replace driveshaft
b. Clean driveshaft
c. Balance or replace as required
d. Rebalance driveshaft by hose clamp method
e. Replace universal joints
f. Rework or replace companion flange.
g. Remove and reassemble driveshaft, to companion flange, 180° from original position.
h. Check and correct trim height at curb weight. Measure joint angle by inclinometer method.
i. Replace necessary parts.
j. Check driveshaft runout at front and rear. Should be less than specified. If 180°and recheck. If still above specified, replace shaft.
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| Roughness, usually at low speeds, light load, 15-35 mph (25-55 km/hr). |
a. Improper joint angles.
Usually rear joint angle is too large.
b. Improperly adjusted front joint angle. |
a. Check rear trim height at curb weight.
Check rear joint angle using inclinometer method.
b. Check and adjust front joint angle by shimming transmission support. |
| Scraping noise |
a. Slinger, companion flange, or end yoke rubbing on rear axle carrier. |
a. Straighten slinger to remove interference. |
| Roughness on heave acceleration (short duration) |
a. Double Cardan joint ball seats or ball worn. |
a. Replace with ball seat repair kit. |
| Roughness - above 35 mph (55 km/hr) felt and/or heard. |
a. Tire unbalanced or worn. |
a. Balance or replace as required. |
| Whine or whistle |
a. Center support bearing (if one is present) |
a. Place car on hoist with rear wheels free to rotate and diagnose for source of noise.
Replace center support bearing if found to be noisy. |
| Squeak |
a. Lack of lubricant
b. Worn double Cardan joint ball or ball seat.
c. Bearing cup retainer on rear joint (1-1 shaft) rubbing on cross. |
a. Lubricate with special grease and adapter.
b. Replace the ball seat and ball with service repair kit.
c. Pry retainer away from cross. |
| Shudder on acceleration, low speed. |
a. Loose or missing bolts at center bearing support to frame cross member.
b. Incorrectly set front joint angle.
c. Incorrect plan view joint angle. |
a. Replace or tighten bolts to specified torque.
b. Shim under transmission support mount to decrease front joint angle.
c. Use alignment gage cable and weighted strings from engine pulleys and driveshaft to align shaft in plan view. |
