Drive Shaft Phasing
NOTE:
Drive shaft phasing does not normally need to be performed unless engine/transmission or differential assembly has been removed and installed or if noise or vibration is present and a visible inspection of drive shaft failed to reveal any obvious wear or damage.
NOTE:
Ensure drive shaft runs straight from transmission to differential assembly without any side-to-side variation. Ensure engine/transmission is centered in its mounts. Any misalignment will be apparent from center bearing forward.
- Measure side-to-side variation of drive shaft position in relation to clearance between drive shaft and drive shaft tunnel. See Fig 1 .
- Check drive shaft deflection by using a large protractor or suitable measuring tool. Measure front and rear drive shaft sections compared to transmission and differential. See DRIVE SHAFT DEFLECTION SPECIFICATIONS table. Place or remove shims from between center bearing and vehicle body or between transmission and transmission rear support.
- Using a protractor or suitable measuring tool, recheck drive shaft deflection.
WARNING:
Maximum allowable height change of center bearing or transmission support when using shims is .118" (3 mm).
| Application | Specification | ||||||
|---|---|---|---|---|---|---|---|
| "U" Joint Deflection Torque | 1.7-6.0 INCH Lbs. (.20-.67 N.m) | ||||||
| Center Mount Preload In Forward Direction | .078-.15" (2-4 mm) | ||||||
| Transmission/Drive Shaft Deflection Angle | |||||||
| 735 Series | |||||||
| Auto. Trans. | -0° 21' To +0° 39' | ||||||
| Man. Trans. | -0° 23' To +0° 37' | ||||||
| 740 Series | |||||||
| Auto. Trans. | -0° 16' To +0° 07' | ||||||
| Man. Trans. | 0° 0' To +1° 0' | ||||||
| 750 Series | -0° 17' To +0° 43' | ||||||
| Center Mount Deflection Angle | |||||||
| 735 Series | |||||||
| Auto. Trans. | -0° 48' To +0° 12' | ||||||
| Man. Trans. | -0° 46' To +0° 14' | ||||||
| 740 Series | |||||||
| Auto. Trans. | -1° 07' To -0° 07' | ||||||
| Man. Trans. | -1° 02' To +0° 02' | ||||||
| 750 Series | -1° 08' To -0° 08' | ||||||
| Drive Shaft/Final Drive Deflection Angle | |||||||
| 735 Series | |||||||
| Auto. Trans. | -0° 10' To +0° 50' | ||||||
| Man. Trans. | -0° 10' To +0° 50' | ||||||
| 740 Series | |||||||
| Auto. Trans. | +0° 40' To +1° 40' | ||||||
| Man. Trans. | +0° 37' To +1° 37' | ||||||
| 750 Series | +0° 40' To +1° 40' | ||||||
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