Worn U-Joints are the usual suspects associated with the rear-end clunk
Spicer brand U-Joints are recommended as replacements for half-shafts and drive shafts
Later Z's do not have replaceable drive shaft U-Joints but this does not matter as most drive shaft shops can do the required machine work to install replaceable U-Joints
Grease every 3000 miles
Technical and Cross Reference:
| Half-Shaft | Drive train |
| Spicer Part 5-1505X Precision Part 393 GMB Part: GUN29 (220-0029) GKN Part: HS448 Borg-Warner: 114-304 Falcon: U393 Nissan: 37125-21025 Koyo: N2880BA Matsuba: UJ112 PD No: RUJ2028 Rockford: K1505 Neapo: 1-0029 D: 28.02 0: 52.9 L |
Spicer Part 5-1501X Precision Part 391 GMB Part: GUN27 (220-0027) GKN Part: HS420 Borg-Warner: 114-302 Falcon: U391 Nissan: 37125-14627 Koyo: N2563 Matsuba: UJ111 PD No: RUJ1781SL Rockford: K1501 Neapo: 1-0027 D: 25.02 0: 40 L |
Two 14mm wrenches are needed to unbolt rear half-shafts. Having the car jacked
and wheels free helps as the wheel can be turned to aid in accessing the bolts
and nuts that hold the flanges together. Each end of the 1/2 shaft (on my '77)
has a flange plate with 4 nuts, bolts and lock washers