Spicer Single Drive Axles Service Manual: 34DS, 34RS, 38DS, 38RS, DS340, RS340, DS380, RS380, DS400, RS400, DS3 - Manual (Page 66)

Inter-Axle Differential Lockout Overhaul.
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"Standard" or "Current" Model Lockout Overhaul
Special Instructions
Three differential model lockouts are used on Dana Tandem Axles. To identify the lockout used on your axle, refer to the illustra-
tions and related service instructions below.
“Standard” Lockouts (Current and Non-Current Models). The “current” model is an improved version of and replaces the “non-
current” lockout. Both are air-operated to engage the lockout and spring-released to disengage the lockout.
Dana Axles may be equipped with either of these lockouts. The “current” model is interchangeable with the “non-current” model
as an assembly. For service information, refer to the following page.
“Reverse-Air” Lockout. The “Reverse-Air” lockout is spring- operated to engage the lockout and air-operated to disengage the
lockout. This model is similar to the “non-current” “standard” lockout. It is not available in the new “current” lockout.
Procedure - Disassemble and Remove Lockout.
1. With axle installed in vehicle, place differential lock selector valve in the disengaged (or unlocked) position. Disconnect the
air line at the lockout piston housing.
2. Remove cap screws and lock washers fastening mounting bracket to power divider cover. Remove bracket and piston hous-
ing.
3. Remove locknut, piston with “O” ring, compression spring and shoulder washer from push rod.
Note: The shift fork and push rod cannot be removed with power divider cover installed (see Power Divider instructions).
“Standard” “Current” Model Lockout
Cylindrical
design