Page 322 of 410

Capacities and Specifications
Engine Description ............ “VORTEC” 4300
Type .................................... V6
VINCode ................................. W
Firing Order ...................... 1-6-5-4-3-2
Horsepower
................... 190 at 4,400 rpm
Thermostat Specification ........... I95 OF (9 I “C)
Spark Plug Gap .......... 0.045 inches (0. I 14 cm)
Wheels and Tires
Wheel Nut Torque ............ 95 lb-ft ( 130 N-m)
Tire Pressure ...... See the Certification/Tire label.
See ”Loading Your
Vehicle”
in the Index.
Normal Maintenance Replacement Parts
Replacement part numbers listed in this section are
based on the latest information available at the time
of
printing, and are subject to change. If a part listed in this
manual is not the same
as the part used in your vehicle
when
it was built, or if you have any questions, please
contact your
GM truck dealer.
Thermostat
......................... 12551472
Oil Filter.. ............................. PF52
Air Cleaner Filter
...................... A 1 163C
PCV Valve
.......................... CV746C
Automatic Transmission Filter
Kit ...... 24200796
Spark Plugs
........................... 4 1-932
Fuel Filter. ............................ GF481
Front Windshield
Wiper Blade
.......... Trico (20 inchedS0.8 cm)
Backglass Wiper Blade
... Trico (14 inched35.6 cm)
6-63
Page 328 of 410

Maintenance Schedule
Short TripKity Definition
Follow the Short Trip/City Maintenance Schedule if any
one
of' these conditions is true for your
ehick:
0 Most trips are less than 5 to 10 miles (8 to 16 km).
This is particularly important when outside
temperatures are below freezing.
driving
in stop-and-go traffic).
off-road frequently.
your vehicle.
or other comnwcial application.
0 Most trips include extensive idling (such as frequent
0 You operate your vehicle in dusty areas or
0 You I-'recluently tow a trailer or use a carrier on top of
0 If the vehicle is used for delivery service, police, taxi
OII~? of'the 1-ec1,son.s !*OLL .sho~rl~l,fi,ll~~t~~ this .sc*Iwdulc~ if you
optute !mrr \vl?ic*le L~OI- elq* of' thesc c-oditiorzs is tlwt
those cwclitior1.v
(YILIS~ e~lgiw oil to h~wk lloc
SOOIIOK
Short Trip/City Intervals
Every 3,000 Miles (5 000 km): Engine Oil and Filter
Change
(or 3 months, whichever occurs first). Chassis
Lubrication (or
3 months. whichever occurs first). Drive
Axle Service (or 3 months, whichever occurs first).
Short TripKity Intervals
Every 6,000 Miles (10 000 km): Tire Rotation.
Every 15,000 Miles (25 000 km): Air Cleaner Filter
Inspection.
if' driving in dusty conditions. Front
Wheel Bearing Repack (2WD only) (or at each brake
relining, whichever occurs
first).
Every 30,000 Miles (50 000 km): Air Cleaner Filter
Replacement. Fuel Filter Replacement.
Every 50,000 Miles (83 000 km): Automatic
Transmission Service (severe conditions only).
Every 60,000 Miles (100 000 km): Engine
Accessory Drive Belt Inspection. Fuel Tank, Cap
and Lines Inspection.
Every 100,000 Miles (166 000 km): Spark Plug Wire
Inspection. Spark Plug Replacement. Positive
Crankcase Ventilation (PCV
j Valve Inspection.
Every 150,000 Miles (240 000 km): Cooling System
Service (or every
60 months. whichever occ~lrs first).
Thc>,vt> if?ter~ul.s o~l~- .swwncrri:o 1uc1intemtlce ser\!ic:t>s.
He ,s11t-~3 to folloct- the c-omplote mrlirztencrnc'cJ .sc*he,dult?
on tl~~~.~~)ll~)~~,i~l~~ pclgr.s.
7-5
Page 329 of 410

Maintenance Schedule
I Long Trip/Hiahway Definition
Follow this maintenance schedule only if none of the
conditions from the Short Trip/City Maintenance
Schedule
is true. Do not use this schedule if the vehicle
is used
for trailer towing, driven in a dusty area or used
off paved roads. Use the Short Trip/City schedule for
these conditions.
Lone TridHiehwav Intervals
Every 7,500 Miles (12 500 km): Engine Oil and Filter
Change (or every
12 months, whichever C)CCLI~S first).
Chassis Lubrication (or every
I2 months, whichever
occ~~rs first). Drive Axle Service. Tire Rotation.
Every 30,000 Miles (50 000 km): Fuel Filter
Replacement.
Air Cleaner Filter Replacement. Front
Wheel Bearing Repack (2WD only) (or at each brake
relining, whichever occurs first).
Transmission Service (severe conditions only).
Drive Belt Inspection. Fuel
Tank, Cap and
Lines Inspection.
Inspection. Spark Plug Replacement. Positive
Crankcase Ventilation (PCV) Valve Inspection.
Every 150,000 Miles (240 000 km): Cooling System
Service
(or every 60 months. whichever occurs first).
Every 50,000 NIiles (83 000 km): Automatic
Every 60,000 Miles (100 000 km): Engine Accessory
Every 100,000 Miles (166 000 km): Spark Plug Wire
7-6
Page 336 of 410
Short Trip/City Maintenance Schedule
30,000 Miles (50 000 kmj
0 Change engine oil and filter (or every
3 months, whichever occurs first).
AI! Emission Co1ltrol Scl-\*ic.t..
0 Lubricate chassis components (or every
3 months, whichever occurs first).
(See footnote
#.)
Check rear/front axle fluid level and add
fluid as needed. Check constant velocity
joints
and axle seals for leaking.
(See footnote
'?)
For Two-Wheel-Drive vehicles only: Clean
and repack
the front wheel bearings (or at
each brake relining, whichever occurs first)
0 Replace fuel filter. AI! Ellrissiorl Colmol Ser\lir*P.
0 Replace air cleaner filter.
,411 EI1lissioII Control Sen*ice.
0 Rotate tires. See "Tire Inspection and
Rotation"
in the Index for proper rotation
pattern and additional information.
(See footnote
+.)
(See footnote?-.)
7-13
Page 343 of 410

60,000 Miles (100 000 km)
0 Change engine oil and filter (or every
3 months, whichever occurs first).
An Emissio~ Corztd Senic-e.
0 Lubricate chassis components (or every
3 months, whichever occurs first).
(See footnote
#.)
0 Check readfront axle fluid level and add
fluid
as needed. Check constant velocity
joints and axle seals for leaking.
(See footnote
:Yj
0 For Two-Wheel-Drive vehicles only: Clean
and repack the front
wheel bearings (or at
each brake relining, whichever occurs first).
0 Inspect engine accessory drive belt.
Replace fuel filter. Ar? Emissioll Comd Srl-l!ic*c).
(See footnote?.)
0 Replace air cleaner filter.
0 Inspect f~lel tank, cap and lines for damage
or leaks. Inspect
fuel cap gasket for any
darnage. Replace parts as needed.
AI? ~missio~~ ~omo1 Lyc.rllic.c.. (See footnote?.)
0 Rotate tires. See “Tire Inspection and
Rotation”
in the Index for proper rotation
pattern and additional information.
(See footnote
+.)
AI! Emissior~ Col1tr-01 Set-1tic.c..
DATE SERVICED BY: ACTUAL ICIT1,EAGE
Short TripKity Maintenance Schedule *
7-20
Page 349 of 410
I Short TripKity Maintenance Schedule I
90,000 Miles (150 000 km)
0 Change engine oil and filter (or every
3 months, whkhever occurs first).
An Emissiorz Contr-ol Scr.1)ic.c.
0 Lubricate chassis components (or every
3 months, whichever occurs first).
(See footnote
#.)
0 Check readfront axle fluid level and add
fluid
as needed. Check constant velocity
joints and axle seals for leaking.
(See footnote
a‘i:.>
0 For Two-Wheel-Drive vehicles only: Clean
and repack
the front wheel bearings (or at
each brake relining, whichever occurs first).
0 Replace fuel filter.
0 Replace air cleaner filter.
0 Rotate tires. See “Tire Inspection and
Rotation”
in the Index for proper rotation
pattern and additional information.
(See footnote
+.)
A}! Emissioll com.c>/ Surljic*c. (See footnote?.)
Ai1 Emissiorl Corlfr.01 Senkc).
DATE SERVICED BY
ACTUAL R/III,EAGE
7-26
Page 357 of 410
1. Long Trip/Highway . Maintenance Schedule
30,000 Miles (50 000 km)
0 Change engine oil and filter (or every
12 months, whichever occurs first).
0 Lubricate chassis components (or every
12 months, whichever OCCLI~S first).
(See footnote
#.)
0 Check rear/front axle fluid level and add
fluid
as needed. Check constant velocity
joints and axle seals for leaking.
(See footnote
:!+:.)
0 For Two-Wheel-Drive vehicles only: Clean
and repack the front wheel bearings (or
at
each brake relining, whichever occurs first).
AI? EIuission Cof1trol Sur1:ic-e.
0 Rotate tires. See "Tire Inspection and
Rotation"
in the Index for proper rotation
pattern and additional information.
(See footnote +.)
0 Replace fuel filter.
AI! E/~/i,sxio/~ CoIItroI Sol-\*icv. (See footnote?.)
0 Replace air cleaner filter.
AII Enlissiorl Coutrol S'or1~iw.
ACTUAL MILEAGE SERVICED BY
7-34
Page 366 of 410
1 Long Tripmighway Maintenance Schedule
90,000 Miles (150 000 km)
0 Change engine oil and filter (or every
12 months. whichever occurs first).
,417 En1i.r.rio1l Colltrol Se/-\sic.c.).
U Lubricate chassis co~nponents (or every
12 months, whichever occurs first).
(See footnote
#. j
0 Check rear/ft-ont axle fluid level and add
fluid as needed. Check constant velocity
joints and axle seals for leaking.
( See footnote ‘w . )
0 For Two-Wheel-Drive vehicles only: Clean
and repack the ,front wheel bearings
(or at
each brake relining. whiche.ver occurs first).
0 Replace fuel filter.
Replace air cleaner filter.
0 Rotate tires. See “Tire Inspection and
Rotation”
in the Index for proper rotation
pattern and additional information.
(Se.e footnote
+.)
A!! ~/ni,ssio/7 CO/7tw/ Ser\>ice. (See footnote+*.)
AH Emissiott Collttnl Sc.l-\.icc>.
DL4TE SEKVICED BY: ACTUAL k1ILEAGE
7-43