Quad cab 4 wheel drive lS
Joe, Could be a few things, U joint, E brake shoes falling off inside rotor, bad bearing in diff. better take it into a good tech. and have checked. too hard to diagnose from here. "Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info.
Grinding noise Chevy Silverado and what caused it
So the front seal on my 2004 Chevrolet Silverado rear Diff was leaking so...
http://www.fullsizechevy.com/forum/general-discussion/technical-maintenance/415961-grinding-noise-coming-under-truck-rear-truck-help.html
Understanding and Diagnosing Rear Differential Noise Fuel Friction An...
SOURCE: heater core on a 2003 Chevrolet pickup 4 wheel drive crew cab
if you have air conditioning you will need to take it to a garage and recover the r134, you will need to remove the dash to allow you to remove the heater box, it's an ugly job, I've done a dozen or so and can do it in about 6 hours now, the first time it was closer to 11 hrs, good luck
SOURCE: 9Z71 grinding in 4 WD
That Sounds a lot like you have a Gear Broken off inside the Transfer Case. Not a Cheap fix or Easy Either But, Necessary
SOURCE: 99 Silverado 4-wheel drive not engaging
It does not seem that sufficient diagnosis was done. No, you cant give a specific diagnosis like that without tearing unit down. It's likely that they told you the most common failure and left it at that. Likely there is a problem with your unit...I think this becomes more of a trust issue than a mechanical one. A second opinion from an independent reputable shop may help but either way, you need to have it fixed. In not using it much, it makes me wonder how it got worn.
good luck
SOURCE: my 4hi switch flashes when i engage 4 wheel drive.
Are you getting any error messages or codes ? Code might not directly point out the switch but give other info that might lead back there. Always good to have all available info when trying to figure out the problem, There might not be any code, depending on exact problem, not everything has a code.
You might find a code for the TCCM. Another possibility is this is an actuator problem, might want to try unplugging the actuator before pushing 4wd buttons and seeing if the lights/axles behave different. Do be sure that both fuses are good, 4WD and T-Case.
Here have one TSB about this (without pics)...
SLOW OR NO ENGAGEMENT OF FRT. AXLE WHEN 4WD IS SELECTED #76-43-01A - (Sep 18, 1998)
REVISION: 09/17/98 DIVS INVL 1 5 7
THIS
BULLETIN IS BEING REVISED TO ADD INFORMATION TO THE SERVICE PROCEDURE,
ADD A NEW PART NUMBER, AND INCLUDE SCHEMATICS. PLEASE DISCARD CORPORATE
BULLETIN NUMBER 76-43-01 (SECTION 4 - DRIVE AXLE).
______________________________________________________________________
SUBJECT:
SLOW OR NO ENGAGEMENT OF FRONT AXLE WHEN 4WD IS SELECTED (REPLACE FRONT
AXLE ACTUATOR)
MODELS: 1988-97 CHEVROLET AND GMC K MODELS EXCLUDING 1988-93 MODELS OVER 8500# GVW
CONDITION:
SOME
OWNERS MAY COMMENT THAT THE COLDER THE OUTSIDE TEMPERATURE IS, THE
LONGER IT TAKES FOR THE FRONT AXLE TO ENGAGE WHEN 4 WHEEL DRIVE IS
SELECTED, OR THE FRONT AXLE DOES NOT ENGAGE.CAUSE:
THE FRONT
AXLE ENGAGEMENT ACTUATOR IS A THERMALLY ACTIVATED COMPONENT. BECAUSE OF
THIS CHARACTERISTIC, THE TIME REQUIRED FOR THE ACTUATOR TO COMPLETE 4
WHEEL DRIVE ENGAGEMENT IS EXTENDED AS THE TEMPERATURE DROPS.CORRECTION:
REPLACE
THE FRONT AXLE ACTUATOR AND INCLUDE THE APPLICABLE WIRING HARNESS KIT.
REFER TO THE PARTS INFORMATION IN ORDER TO DETERMINE WHICH WIRING
HARNESS KIT IS NEEDED.
1996 MODEL TRUCKS WITH A BUILD DATE ON OR
AFTER JANUARY 2, 1996 ARE CONSIDERED AS "96I". IF THE BUILD DATE OF THE
TRUCK IS UNKNOWN, VERIFY THE 3 CHARACTER "AXLE CODE" ON THE FRONT AXLE
LABEL IN ORDER TO DETERMINE WHICH WIRE HARNESS TO ORDER.
THIS NEW
ACTUATOR USES A MOTOR TO ENGAGE THE FRONT AXLE AND IS NOT AFFECTED BY
TEMPERATURE. ON 1988-93 MODELS WITH A GVW RATING OVER 8500#, THE NEW
ACTUATOR CANNOT BE INSTALLED AND THE THERMAL ACTUATOR WILL REMAIN THE
SERVICE PART.
SERVICE PROCEDURE
1. REMOVE THE FRONT DIFFERENTIAL CARRIER SHIELD, IF EQUIPPED.
2.
IF NECESSARY, CLEAN THE AXLE HOUSING IN THE AREA AROUND THE EXISTING
ACTUATOR. DISCONNECT THE ACTUATOR'S ELECTRICAL CONNECTION AT THE FRONT
AXLE HOUSING.
3. REMOVE THE FRONT AXLE ACTUATOR BY UNTHREADING THE ACTUATOR FROM THE AXLE HOUSING.
4. INSTALL THE SPACER FROM THE WIRING KIT INTO THE AXLE TUBE WITH THE FLAT SIDE SEATED AGAINST THE SHIFT FORK.
5.
INSTALL THE ACTUATOR MOTOR AND TIGHTEN UNTIL THE SHOULDER OF THE
ACTUATOR SEATS AGAINST THE AXLE TUBE.IMPORTANT: IF BINDING OCCURS BEFORE
THE ACTUATOR IS SEATED, REMOVE THE ACTUATOR AND RESEAT THE SPACER BY
PUSHING ON THE SPACER WITH A SCREWDRIVER. THEN REINSTALL THE ACTUATOR.
ON
K3 MODELS WITH THE CAST IRON AXLE TUBE, THERE MAY BE A CASTING BURR
WHICH MAY CONTACT THE EDGE OF THE ACTUATOR. THIS SHOULD NOT CREATE A
CONCERN AND THE ACTUATOR SHOULD SEAT AGAINST THE AXLE TUBE. IF THIS
CONTACT REMAINS A CONCERN, USE A DIE GRINDER IN ORDER TO REMOVE THE
BURR.
6. CONNECT THE SERVICE HARNESS CONNECTOR TO THE ACTUATOR AND
CONNECT THE 2-PIN CONNECTOR TO THE MATING CONNECTOR AT THE AXLE. FOR
1994 TO CURRENT MODELS, IN THE CASE OF A COMPLETE AXLE REPLACEMENT,
REFER TO FIGURE 1.
7. ROUTE THE WIRING HARNESS ALONG THE EXISTING
HARNESS ON THE RIGHT SIDE OF THE VEHICLE. ROUTE CKT 241 (BRN) OVER THE
TOP AND TO THE LEFT OF THE TRANSMISSION. SECURE THE HARNESS USING
PLASTIC TIES.
8. FOR 1995-97 INTERIM VEHICLES, LOCATE THE 4-WIRE
CONNECTOR (C120) ON THE LEFT SIDE OF THE TRANSMISSION. SPLICE THE BRN
WIRE OF THE ACTUATOR HARNESS INTO CAVITY D OF CKT 241 (BRN) ON THE
ENGINE SIDE OF CONNECTOR C120. FOLLOW THE SPLICING PROCEDURE DESCRIBED
IN SECTION 8A (ELECTRICAL DIAGNOSIS REPAIR PROCEDURES) OF THE APPLICABLE
SERVICE MANUAL.IMPORTANT: THE NEW FAST AXLE ACTUATOR REQUIRES ONLY 1
SPLICE. - FOR 1993 AND PRIOR VEHICLES, SPLICE INTO CKT 50 (BRN) BETWEEN
CONNECTOR C152 AND GT101 (FIGURES 2,3,4). - FOR 1994 VEHICLES, SPLICE
INTO CKT 50 (BRN) BETWEEN CONNECTOR C152 AND P101 (FIGURES 5,6). - FOR
1995-97 VEHICLES, SPLICE INTO CKT 241 (BRN) BETWEEN CONNECTORS C120 AND
C100 (FIGURE 7).
NOTICE: CONNECTIONS MUST BE WATER TIGHT IN ORDER TO
PREVENT WATER FROM ENTERING THE CIRCUIT AND CAUSING DAMAGE TO THE
COMPONENTS.
9. ON K3 MODELS, INSTALL THE DELAY RELAY, INCLUDED
AS PART OF THE WIRING HARNESS KIT, AT THE ENGINE SIDE OF THE BULKHEAD,
ADJACENT TO THE EXISTING RELAY. MOUNT THE NEW RELAY WITH SELF-DRILLING
FASTENER, P/N 22510339. ROUTE AND SECURE THE RELAY WIRE HARNESS BEHIND
THE RIGHT OXYGEN SENSOR HEAT SHIELD.
10. VERIFY SYSTEM OPERATION.
WHEN SHIFTING THE TRANSFER CASE, YOU SHOULD HEAR THE ACTUATOR MOTOR
OPERATE.IMPORTANT: THIS RELAY INCORPORATES A 5 SECOND DELAY FOR THE
FRONT AXLE TO ENGAGE IN ORDER TO ALLOW THE TRANSFER CASE SYNCHRONIZER TO
ENERGIZE.
FOR 88-93 VEHICLES, IF THE AXLE HAS TO BE REPLACED,
USE JUMPER HARNESS P/N 15313272. CKT 1695 (BLK/WHT) FITS INTO CAVITY A
OF THE FAST ACTUATOR. THE CIRCUIT INCLUDES THE CABLE SEAL AND THE
TERMINAL PIN. THIS CIRCUIT PLUGS INTO THE 5-PIN AXLE ACTUATOR CONNECTOR.
11. DO THE FOLLOWING STEPS IN ORDER TO INSTALL JUMPER HARNESS P/N 15313272:
1.
LOCATE THE AXLE ACTUATOR 5-PIN CONNECTOR ON THE SERVICE ACTUATOR WIRING
HARNESS AND REMOVE THE TPA. 2. REMOVE AND DISCARD THE CAVITY PLUG FROM
CAVITY A. 3. INSTALL CKT 1695 LEAD (BLK/WHT) FROM THE JUMPER HARNESS
THAT HAS THE CABLE SEAL AND TERMINAL INTO AXLE ACTUATOR CONNECTOR CAVITY
A. 4. REINSTALL THE TPA ON THE 5-PIN CONNECTOR. 5. INSTALL THE SERVICE
ACTUATOR HARNESS 5-PIN CONNECTOR INTO THE AXLE ACTUATOR. 6. CONNECT
JUMPER HARNESS 2X2 CONNECTOR INTO THE EXISTING VEHICLE 4WD MATING
CONNECTOR. 7. STRAP THE JUMPER HARNESS AND THE SERVICE HARNESS TO THE
TAB ON THE AXLE TUBE.PARTS INFORMATION:
P/N DESCRIPTION QTY --- ----------- ---
26060073 ACTUATOR ASM, FRT DRIVE AXLE 1 22510339 FASTENER 1 15313272 HARNESS, JUMPER (Z SPLICE)(88-93 K1-3) 1
AXLE
CODE 12376316 KIT, ACTUATOR WIRING HARNESS (88-96I K1,2) ZLS, ZLT, ZLW
ZLX, ZLY 12376317 KIT, ACTUATOR WIRING HARNESS (96I-97 K1,2) ZWA, ZWB,
ZWD ZWF, ZWG 12376318 KIT, ACTUATOR WIRING HARNESS (94-96I K3) ZLX, ZLY,
ZLZ 12376319 KIT, ACTUATOR WIRING HARNESS (96I-97 K3) ZWF, ZWG, ZWH
PARTS,
EXCEPT P/N 15313272, ARE CURRENTLY AVAILABLE FROM GMSPO. P/N 15313272
IS EXPECTED TO BE AVAILABLE 9-21-98.WARRANTY INFORMATION:
SOME
OWNERS WITH ACTUATORS THAT ARE OPERATING AS DESIGNED (5-30 SECONDS
ENGAGEMENT TIME) MAY CHOOSE TO UPGRADE TO THE FAST ACTUATOR AT THEIR OWN
EXPENSE. THE FAST ACTUATOR IS A NEW PRODUCT ENHANCEMENT AND SHOULD NOT
BE USED TO REPLACE ACTUATORS THAT ARE OPERATING AS DESIGNED.
FOR VEHICLES REPAIRED UNDER WARRANTY, USE:
LABOR OPERATION DESCRIPTION LABOR TIME --------- ----------- ----------
F0025 ACTUATOR, FRONT DIFFERENTIAL USE PUBLISHED LABOR LOCKING, REPLACE OPERATION TIME
N6112
WIRING AND/OR CONNECTOR-REPAIR USE PUBLISHED LABOR OPERATION
TIMEIMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE
WARRANTY SYSTEM.
GENERAL
MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A
"DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF
CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION
THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED
TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW
TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT
ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE
WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR
BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE
MAY BENEFIT FROM THE INFORMATION
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