Rear Drive Axle and Differential

WARNING: This page is about a different car, the 2007 Ford Pickup and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Ford 10.50-Inch Axle, Single Rear Wheel Assembly

Courtesy of FORD MOTOR CO.

Fig 2: Ford 10.50-Inch Axle, Dual Rear Wheel Assembly

Courtesy of FORD MOTOR CO.

Fig 3: Exploded View Of Rear Axle - 10.50-Inch Ring Gear, Traction-Lok®

Courtesy of FORD MOTOR CO.

Item	Part Number	Description
1	-	Rear axle identification tag (part of 4001)
2	4346	Differential housing cover bolt
3	4033	Differential housing cover
4	4241	Differential pinion shaft lock bolt
5	391973-S1300	Differential case bolt
6	4230	Differential pinion thrust washer
7	4215	Differential pinion gear
8	4211	Differential pinion shaft
9	4236	Differential side gear
10	4228	Differential side gear thrust washer
11	4067	Differential bearing shim
12	4222	Differential bearing cup
13	4221	Differential bearing
14	4216	Ring gear bolt
15	4204	Differential case
16	4B409	Anti-lock speed sensor ring
17	4209	Ring gear and pinion
18	4663	Drive pinion bearing adjustment shim
19	-	Bearing cap and bolt (part of 4010)
20	4630	Pinion bearing (inner)
21	4628	Inner axle pinion bearing cup
22	9E731	RABS sensor
23	4616	Outer pinion bearing cup
24	4662	Collapsible spacer
25	4621	Pinion bearing (outer)
26	4670	Rear axle drive pinion shaft oil slinger
27	4676	Rear axle drive pinion seal
28	4851	Pinion flange
29	389546-S100	Pinion nut
30	1244	Rear wheel bearing inner cone and roller
31	1177	Wheel bearing oil seal
32	1107	Lug bolt
33	4234	Axle shaft
34	N811648-S100	Axle shaft nut
35	1012	Lug nut
36	2C026	Rear disc brake rotor
37	1109	Rear hub
38	390258-S	Gasket
39	1240	Bearing
40	1A034	Hub and bearing cup
41	1113	Rear brake hub and drum (SRW only)
42	1113	Rear brake hub and drum (DRW only)
43	4947	Differential clutch pack
44	4A324	Rear axle differential clutch shim
45	4214	Differential clutch spring
46	390943-S100	Filler plug
47	4010	Rear axle housing
48	2209	Brake adapter plate

Fig 4: Exploded View Of Rear Axle - 10.50-Inch Ring Gear, Conventional

Courtesy of FORD MOTOR CO.

Item	Part Number	Description
1	-	Rear axle identification tag (part of 4001)
2	4346	Differential housing cover bolt
3	4033	Differential housing cover
4	4241	Differential pinion shaft lock bolt
5	391973-S1300	Differential case bolt
6	4230	Differential pinion thrust washer
7	4215	Differential pinion gear
8	4211	Differential pinion shaft
9	4236	Differential side gear
10	4228	Differential side gear thrust washer
11	4067	Differential bearing shim
12	4222	Differential bearing cup
13	4221	Differential bearing
14	4216	Ring gear bolt
15	4204	Differential case
16	4B409	Anti-lock speed sensor ring
17	4209	Ring gear and pinion
18	4663	Drive pinion bearing adjustment shim
19	-	Bearing cap and bolt (part of 4010)
20	4630	Pinion bearing (inner)
21	4628	Inner axle pinion bearing cup
22	9E731	RABS sensor
23	4616	Outer pinion bearing cup
24	4662	Collapsible spacer
25	4621	Pinion bearing (outer)
26	4670	Rear axle drive pinion shaft oil slinger
27	4676	Rear axle drive pinion seal
28	4851	Pinion flange
29	389546-S100	Pinion nut
30	1244	Rear wheel bearing inner cone and roller
31	1177	Wheel bearing oil seal
32	1107	Lug bolt
33	4234	Axle shaft
34	N811648-S100	Axle shaft nut
35	1012	Lug nut
36	2C026	Rear disc brake rotor
37	1109	Rear hub
38	390258-S	Gasket
39	1240	Bearing
40	1A034	Hub and bearing cup
41	1113	Rear brake hub and drum (DRW only)
42	390943-S100	Filler plug
43	4010	Rear axle housing
44	2209	Brake adapter plate

The Ford 10.50 inch rear axle assembly is an integral type housing, hypoid gear design with the centerline of the ring gear set below the pinion centerline.

The hypoid ring gear and pinion consists of a 10.50 inch diameter ring gear and an overhung drive pinion. The pinion is positioned by selected pinion shims and supported by 2 opposed tapered roller bearings. Pinion bearing preload is adjusted by the pinion nut and a collapsible spacer.

The rear axle housing consists of a cast center section with 2 steel tubes and a stamped steel rear cover. The differential housing cover uses a silicone sealant as a gasket.

The differential case is a 1- or 2-piece design depending upon the application. The differential pinion shaft in the 1-piece differential case design (2-pinion) is retained with a threaded bolt. The 2-piece differential case 3-pinion spider is retained by the case halves which are bolted together.

The rear axle drive pinion receives its power from the engine through the transmission and driveshaft. The drive pinion rotates the differential case through engagement with the ring gear, which is bolted to the case outer flange.

Inside the 2-piece differential case, 3 differential pinion gears are mounted on a 3-post shaft. Inside the 1-piece differential case, 2 differential pinion gears are mounted on a straight shaft. These differential pinion gears are engaged with the differential side gears to which the axle shafts are splined. Therefore, as the differential case turns, it rotates the axle shafts and rear wheels. When it is necessary for one wheel and axle shaft to rotate faster than the other, the faster turning differential side gear causes the differential pinion gears to roll on the slower turning differential side gear to allow differential action between the 2 axle shafts.

The 10.50 inch rear axle uses Motorcraft SAE 75W-140 High Performance Rear Axle Lubricant XY-75W140-QL (vehicles with the trailer towing option or 4:10 ratio) meeting Ford specification WSL-M2C192-A.