Dodge Ram Truck 1500-2500-3500. Manual

31. Remove overrunning clutch assembly (2). Assem-

bly can be removed without displacing rollers and
springs if care is exercised. Note position of roll-
ers and springs for assembly reference.

32. Remove rear band adjusting lever and reaction

pin.

33. Remove rear band.

34. Compress front servo rod guide (2) with large

C-clamp (1) and Tool C-4470 (4), or Compressor
Tool C-3422-B. Compress guide only enough to
permit snap-ring removal (about 1/8 in.).

35. Remove servo piston snap-ring (4). Unseat one

end of ring. Then carefully work removal tool
around back of ring until free of ring groove. Exer-
cise caution when removing snap-ring. Servo
bore can be scratched or nicked if care is not
exercised.

36. Remove tools and remove rear servo retainer (3),

spring and piston assembly.

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AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION

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CLEANING

Clean the case in a solvent tank. Flush the case bores and fluid passages thoroughly with solvent. Dry the case and
all fluid passages with compressed air. Be sure all solvent is removed from the case and that all fluid passages are
clear.

NOTE: Do not use shop towels or rags to dry the case (or any other transmission component) unless they
are made from lint-free materials. Lint will stick to case surfaces and transmission components and circu-
late throughout the transmission after assembly. A sufficient quantity of lint can block fluid passages and
interfere with valve body operation.

Lubricate transmission parts with Mopar

ATF +4, Automatic Transmission fluid, during overhaul and assembly. Use

petroleum jelly to prelubricate seals, O-rings, and thrust washers. Petroleum jelly can also be used to hold parts in
place during reassembly.

INSPECTION

Inspect the case for cracks, porous spots, worn bores, or damaged threads. Damaged threads can be repaired with
Helicoil thread inserts. However, the case will have to be replaced if it exhibits any type of damage or wear.

Lubricate the front band adjusting screw threads with petroleum jelly and thread the screw part-way into the case.
Be sure the screw turns freely.

Inspect the transmission bushings during overhaul. Bushing condition is important as worn, scored bushings con-
tribute to low pressures, clutch slip and accelerated wear of other components. However, do not replace bushings
as a matter of course. Replace bushings only when they are actually worn, or scored.

The use of crocus cloth is permissible where necessary, providing it is used carefully. When used on shafts, or
valves, use extreme care to avoid rounding off sharp edges. Sharp edges are vital as they prevent foreign matter
from getting between the valve and valve bore.

Do not reuse oil seals, gaskets, seal rings, or O-rings during overhaul. Replace these parts as a matter of course.
Also do not reuse snap rings or E-clips that are bent or distorted. Replace these parts as well.

ASSEMBLY

Do not allow dirt, grease, or foreign material to enter the case or transmission components during assembly. Keep
the transmission case and components clean. Also make sure the tools and workbench area used for reassembly
operations are equally clean.

Shop towels used for wiping off tools and your hands must be made from lint free materials. Lint will stick to trans-
mission parts and could interfere with valve operation or even restrict fluid passages.

Lubricate transmission clutch and gear components with Mopar

ATF +4 during reassembly. Soak clutch discs in

transmission fluid before installation.

Use petroleum jelly on piston seals and o-rings to ease installation. Petroleum jelly can also be used to lubricate
and hold thrust washers and plates in position during assembly.

Do not use chassis grease, bearing grease, white grease, or similar lubricants on any part. These types of
lubricants can eventually block or restrict fluid passages and valve operation. Use petroleum jelly only.

Do not force parts into place. The transmission components and sub-assemblies are easily installed by hand when
properly aligned. If a part seems difficult to install, it is either misaligned or incorrectly assembled. Verify that thrust
washers, thrust plates and seal rings are correctly positioned.

The planetary geartrain, front/rear clutch assemblies and oil pump are all much easier to install when the transmis-
sion case is upright. Either tilt the case upward with wood blocks, or cut a hole in the bench large enough for the
intermediate shaft and rear support. Then lower the shaft and support into the hole and support the rear of the case
directly on the bench.

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AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION

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FRONT/REAR SERVO

1. Lubricate rear servo piston seal with ATF +4. Lubri-

cate servo bore in case with ATF +4.

2. Install rear servo piston (1) in case. Position piston

at slight angle to bore and insert piston with twist-
ing motion.

3. Install rear servo spring (1) and retainer (3) in case

bore. Be sure spring (1) is seated on piston (2).

4. Compress rear servo piston with C-clamp (2) or

Valve Spring Compressor C-3422-B and install
servo piston snap-ring (4).

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Dodge Ram Truck 1500-2500-3500. Manual - part 1768