ST_330_72_1972_Chevrolet_Truck_Chassis_Service_Manual_10_to_30

REAR SUSPENSION AND DRIVE LINE 4-7

GENERAL DESCRIPTION

SERIES 10 3300 AND 3500 LB. p ressed into the crossbore of the cast c a r r ie r - e a c h tube
CAPACITY (SALISBURY-TYPE) AXLES is puddle welded to the c a rrie r. Welded-on brackets
provide attachment points for suspension components
The 3300, and 3500 lb. capacity (Salisbury-Type) axle such as spring seats, shock absorbers and control arm s.
(fig. 15) is a sem ifloating, fabricated constructed type A welded flange is provided for brake flange plate
consisting of a cast c a r r ie r with larg e bosses on each attachm ent.
end into which two welded steel tubes are fitted. The
c a rrie r contains an overhung hypoid pinion and ring gear. An overhung hypoid drive pinion is supported by two
The differential is a two pinion arrangem ent. preloaded tapered roller bearings. The pinion shaft is
sealed by m eans of a molded, spring loaded, rubber seal.
The axle housing is made up of two steel welded tubes

1. Companion Flange 7. Differential Case 13. Cover 19. Thrust Washer
2. Deflector 8. Shim (A) with Service Shim 14. Pinion Shaft 20. Differential Pinion
9. Gasket 15. Ring Gear 21. Shim
3. Pinion O il Seal 10. Differential Bearing 16. Side Gear 22. Pinion Rear
4. Pinion Front Bearing 17. Bearing Cap
11. “ C ” Lock 18. Axle Shaft Bearing
5. Pinion Bearing Spacer 12. Pinion Shaft Lock Bolt 23. Drive Pinion

6. Differential Carrier

Fig. 15— Rear A x le Cross Sectio n —3300, 3500 lb. C a p a c ity — Series 10

10-30 CHEVROLET TRUCK SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-8

The seal is mounted on the pinion flange which is splined SERIES 20-30 5200 AND 7200 LB.
and bolted to the hypoid pinion shaft.
CAPACITY AXLES
The hypoid ring gear is bolted to a one-piece differen­
tial case which is supported by a two preloaded tapered The 5200 and 7200 lb. capacity truck re a r axles (fig„ 16)
roller bearings. are of the full floating type with hypoid ring gear and
drive pinion. The full floating construction enables easy
SERIES 20 5500 LB. CAPACITY AXLES (DANA) rem oval of axle shafts without removing truck load and
without jacking up the axle. The differential c a r r ie r is
The 5500 lb. capacity axle is a Salisbury Design full heavily ribbed to provide rigid support for the differential
floating axle. Their service procedures are a combina­ assem bly--differential caps are doweled to the c a rrie r to
tion of S eries 10 Salisbury axle p rocedures and Series assure perfect alignment.
20-30, 5200, 5500 lb. capacity axle serv ice pro cedures.
Consequently, re fe r to S eries 10, 3300 and 3500 lb. The straddle-m ounted drive pinion is supported at the
capacity axle service procedures for service on the dif­ front by two opposed tapered ro lle r bearings. The pinion
ferential such as pinion shaft oil seal and companion re a r bearing is a ro lle r bearing assem bly consisting of
flange and to S e rie s 20-30, 5200 - 7200 lb. capacity axles an outer race and roller assem bly--a precision ground
service p ro ced u res for serv ice on wheel hubs, b earings, d iam eter on the pinion pilot functions as an inner race.
and axle shafts.
A th ru st pad mounted on the end of an adjustable screw
threaded into the c a rrie r housing lim its deflection of the
ring gear under high torque conditions.

1. Nut 20 19 13. Pinion Shaft Lock Screw 19. Differential Pinion
2. Washer 14. Differential Side Gear 20. Ring Gear
7. Shim 15. Thrust Washer 21. Axle Shaft
3. Companion Flange 8. Drive Pinion 16. Differential Pinion Gear 22. Drive Pinion Rear Bearing
9. Shim 17. Thrust Washer 23. Drive Pinion Front Bearing
4. Deflector 10. Shim 18. Differential Case
11. Differential Side Bearing
5. Seal 12. Gasket
6. Slinger

Fig. 15A— Dana 5500 lb. C a p a c ity A x le —Cross Section

10-30 CHEVROLET TRUCK SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-9

1. Universal Jo in t Yoke 6. Drive Pinion 12. Differential Pinion (Spider) 16. Differential Bearing
2. Pinion Bearing and O il 7. Pinion Bearing Shim Gear
8. Rear Pinion Bearing 17. Differential Bearing Adjusting
Seal Retainer 9. Rina Gear Thrust Pad 13. Differential Side Gear Nut
3. O il Seal 10. Ring Gear 14. Differential Case — Left
4. Gasket 11. Differential Spider 18. Adjusting Nut Lock
5. Front Pinion Bearing Half 19. Differential Case — Riaht
15. Axle Shaft
Half

Fig. 16—5200 and 7200 lb. Capacity A xle—Cross Section—Series 20-30

B asically the two axle assem b lies a re identical with the 11,000 LB. CAPACITY AXLES
exception of drive gear ratios and brake assem blies;
however, some vehicles utilize a two-pinion differential The 11,000 lb. capacity, single-speed hypoid axle,
while others use a four-pinion differential. illu stra ted in Figure 17 have a straddle mounted drive

10-30 CHEVROLET TRUCK SERVICE MANUAL

REAR SUSPENSION AND DRIVE LINE 4-10

1. Universal Joint Yoke 6. Drive Pinion 11. Differential Pinion (Spider) 15’. Differential Bearing
2. Pinion Bearing O il Seal 7. Rear Pinion Bearing Gear 16. Differential Bearing Adjusting
8. Ring Gear Thrust Pad
and Retainer 9. Ring Gear 12. Differential Side Gear Nut
3. O il Seal 10. Differential Spider 13. Differential Case - Left Half 17. Adjusting Nut Lock
4. O il Seal Gasket 14. Axle Shaft 18. Differential Case - Right Half
5. Front Pinion Bearing

Fig. 17— 11,000 lb. Capacity Axle Cross Section—Series 30

pinion which is supported at the re a r by a straig h t ro lle r threaded into the c a rrie r housing lim its deflection of the
bearing. The pinion front bearing consists of a double ring gear under high torque conditions.
row ball bearing.
Involute splines a re incorporated in the axle shaft
The differential is a conventional four-pinion type. flange and in the wheel hubs.
Thrust w ashers are used between the side gears and
case and also between differential pinions and the dif­ This design provides for the driving torque to be tra n s­
ferential case. m itted from the axle shaft to the hub through the mating
splines.
A th ru st pad mounted on the end of an adjusting screw

10-30 CHEVROLET TRUCK SERVICE MANUAL