Driveshafts & U-joints
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To check u-joints while the d'shaft is installed, set the e-brake, shift to N, and see how far you can rotate the t-case output back&forth WITHOUT moving the rear axle yoke/companion flange. Also see how far up&down you can push the d'shaft. Less is better.
1 Nut 382836-S100 Tighten to 11-20 N-m (8-15 lb-ft)
2 Universal Joint 4635 (Type 1330 in most Bronco rear driveshafts: 3 5/8" x 1 1/16")
3 Snap Ring (Part of 4635)
4 Bearing Cup (Part of 4635)
5 Seal (Part of 4635)
6 Trunnion (Part of 4635), aka "spider", "cross"
A Needle Rollers (Part of 4635)
B Thrust Washer (Part of 4635)
C Bearing surface (Part of 4635)
7 Driveshaft 4602
8 Pinion Nut 375646-S2 Tighten to 0.9-1.5 N-m (8-14 lb-in) preload rotating torque (used bearings) or 1.8-3.3 N-m (16-29 lb-in) new bearings.
9 U-Bolt 386867-S
10 Rear Axle Universal Joint Yoke (Half-Round) 4851
11 Dust Seal 4859
12 Driveshaft Slip Yoke 4841
13 Counter Bore/Pilot (Part of 4841)
14 Driveshaft Rear Axle Companion Flange 4851
15 Driveshaft Flange Yoke 4866
16 Bolt N800594-S100 M12x1.75x27mm
Tighten to 83-118 N-m (61-87 lb-ft)
17 Double Cardan Assembly 4635
18 Slip Yoke Boot 4421
19 Driveshaft Center Yoke 4784
20 Driveshaft Centering Socket Yoke 4782 CarQuest (Dana/Spicer/Perfect Circle) PN 9109/7-0079 ~$30
21 Centering Spring (Part of 4782)
22 Transfer Case Yoke (Flange) 7B214
23 Bolt, Tighten to 27-38 N-m (20-28 lb-ft)
Note that greasable u-joints are physically weaker (due to the grease journals drilled through them), and those with the grease fitting screwed in between the trunnions even moreso, due to the wedge effect of the threads. They are also less durable, due to their seals constantly being blown out by the grease being pumped through them. A sealed u-joint (which should be greased before installation, and can be re-greased by disassembly later) is stronger & lasts longer with less maintenance.