Front and Rear Axle Catalog - Spicer

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General Information How To Identify A Spicer Axle iv X510-8 All Spicer Carrier Type axles are identified with a manufacturing date (1) and Bill of Material number (2) stamped on the right or left hand tube on driving axles. The Bill of Material number may also be found on the carrier in some models as shown in illustration (2A). For independent front suspension (IFS) axles, the B/M number may be located at one of three locations: 1). A vertically positioned tag near the center of the right hand side support arm, 2) stamped into the left hand side support arm (opposite end of the camber adjuster), or 3) stamped into the "nose end" of the axle carrier. The location of the information will depend on the manufacturing date of the axle. The axle model number will be cast into one of the webs as shown (3), or it can be on the nose. Each axle contains a gear ratio tag (4), and if the axle is equipped with a limited slip differential, it will have a tag specifying the type of limited slip lubricant to be used (5). Refer to the appropriate model number section for parts identification and a breakdown of the Bill of Material. How To Change Gear Ratios To increase or decrease a gear ratio, there are certain steps that must be taken. The differential case depends upon the ratio desired. For each axle model, there is a high-ratio and a low-ratio case as illustrated below: Axle Model Low Ratio Case High Ratio Case Axle Model Low Ratio Case High Ratio Case Model 27 3.73 and Down 3.92 and Up Model 50 4.10 and Down — Model 28 3.45 and Down 3.73 and Up Model 60 4.10 and Down 4.56 and Up Model 28 IFS Aerostar 2.27, 3.73 — Model 61 Model 30 3.55 and Down 3.73 and Up Semi Float 3.00 and 3.07 only Model 35 2.35 only — Model 61 Model 35 2.73 - 3.31 3.54 and Up Full Float 3.31 and Down 3.54 and Up Model 36 ICA 2.73 and Down 3.07 and Up Model 70 4.10 and Down 4.56 and Up Model 44 3.73 and Down 3.92 and Up Model 70-3HD 3.42 and Down 3.73 and Up Model 44 ICA Model 70-2UA 3.07 only — 1984 & earlier 3.73 and Down 3.92 and Up Model 80 3.73 and Down 4.10 and Up Model 44 ICA 1985 & later 2.87 and Down 3.07 and Up Example - If you have a model 44 Rear Axle with a 3.54 ratio and wish to change to a 3.73 ratio, you change only the ring gear and pinion assembly. If you change the ratio to a 4.09, you must change to a high-ratio case in addition to changing the ring gear and pinion. The application section will show you what case to use. When the vehicle is equipped with both front and rear driving axles, the gear ratios must be the same in both axles. The drive gear screws are self-locking and must be replaced with new screws each time that they are removed.
X510-8 How Limited Slip Differentials Operate A conventional differential transmits all the ring gear torque through the differential gears to the axle shafts. Torque is at all times equal on the axle shafts, and if one wheel slips, the other wheel can only put out as much torque as the slipping wheel. The Spicer Limited Slip differential has the same power flow as a conventional differential, plus a more direct flow which automatically takes effect as driving conditions demand. This more direct power flow is from the differential case to each axle shaft through a clutch plate and disc arrangement. Arrangement of these plates and discs is at the option of the vehicle manufacturer, so care should be taken during disassembly to note the arrangement of these components. The Limited Slip construction permits differential action when required for turning corners and transmits equal torque to both wheels when driving straight ahead. However, when one wheel tries to spin due to leaving the ground, a patch of ice, etc., the clutch packs automatically provide more torque to the wheel which is not trying to spin. The Limited Slip differential resists wheel spin on bumpy roads and provides more pulling power when one wheel tries to slip. In many cases of differences in traction, pulling power will be automatically provided until both wheels start to slip. In diagnosis of vehicle operators' complaints, it is important to recognize two things. 1. If, with unequal traction, both wheels slip, the Limited Slip Differential has done all it can pssibly do. 2. In extreme cases of differences in traction, the wheel with the least traction may spin after the Limited Slip has transferred as much torque as possible to the non-slipping wheel. How To Distinguish a Powr-Lok from a Trac-Lok All Models except Model 80 /286: The Powr-Lok design is identified by its 2-piece case. The Trac-Lok design is identified by its 1-piece case. Model 80 /286 only: Both the Powr-Lok and the Trac- Lok use 2-piece cases in the model 80 (286) axle. The difference between the two is in the shape of the holes for the cross shaft. The Powr-Lok case will have cross shaft holes that are "U" shaped in one case half and "V" shaped in the other case half. The Trac-Lok case will have cross shaft holes that are semicircles in both case halves. It is also possible to replace an existing Powr-Lok unit with a complete Trac-Lok unit. For this purpose, the differential case assembly must be replaced. POWR-LOK 2-Piece Case 4-Pinion Mate Gears How To Obtain Special Service Tools Special service tools (see service manuals) can be obtained from the following company: Kent-Moore OE Tool and Equipment Group SPX Corporation 28635 Mound Road Warren MI 48092-3499 (800) 345-2233 TRAC-LOK 1-Piece Case 2-Pinion Mate Gears v
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Front and Rear Axle Catalog - Spicer

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