Volvo 850 AWD User Manual

850 AWD
General
Modified transmission (M58)
Bevel gear
The 850 AWD with manual transmission M58,
has permanent four-wheel drive with variable
power distribution to the wheels.
Distribution of driving power to the wheels
depends on the condition of the road surface
and driving conditions. Distribution changes to
provide the best possible grip and traction.
The system includes the TRACS system for
the front wheels and a differential lock for the
rear wheels.
Note! Cars with AWD are not designed or built
for off-road driving!
The 850 AWD will initially be available:
as a station wagon
with engine B5254T
with manual transmission M58
in Europe, Canada and certain Overseas
markets.
For further information about the 850 AWD,
see VCC
-049156 (IE not found) , Service
Manual All-wheel drive (AWD), 850 1997-.
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To provide the car with four-wheel drive,
transmission M56 has been modified (and
given the designation M58) so that power can
be taken off to a bevel gear.
The power is transferred between the
transmission's differential housing and bevel
gear's tubular shaft via a splined joint. The
bevel gear crown wheel is pressed and
bonded to a tubular shaft. The bevel gear's
crown wheel and pinion have a ratio of 1:3.31.
As the final drive has a ratio of 1:3.31 the ratio
between the front and rear wheels is the
same.
The bevel gear transmits power to the final
drive via a propeller shaft. The propeller shaft
"VCC-057798 US 2002-07-11"
1

Volvo 850 AWD Specifications

General

Brand	Volvo
Model	850 AWD
Category	Automobile
Language	English

Summary

850 AWD General Information

M58 Transmission and Bevel Gear System

Modified Transmission M58

Details the modification of transmission M56 to M58 for four-wheel drive power takeoff.

Bevel Gear Operation

Explains power transfer via splined joint to bevel gear, crown wheel, and pinion ratio.

Rear Drive Unit Components

Viscous Coupling

Allows power transfer via internal fluid friction, transmitting power to rear wheels when necessary.

Freewheel Unit

Provides braking stability by disconnecting rear wheels during braking, preventing power transfer to front.

Final Drive System

Describes the 1165 final drive, similar to 1055, featuring an automatic differential lock.

Chassis and Systems

Multi-link Rear Suspension

Details the multi-link rear suspension, similar to the 1995 960, using coil springs.

Fuel System Configuration

Covers the saddle fuel tank with an outer expansion tank, capacity of 70 liters.

Impact of AWD Introduction

Outlines system modifications including exhaust, engine mounting, brakes, and bodywork.