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I have a 2002 trailblazer. They just told me the rear and front shift differential plug is seized. What does this mean?

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  • Mike Butler
    Mike Butler May 11, 2010

    Were they going to check differential fluid level, is that how they found out the plugs were seized?

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The plug is to check fluid level and is very common to sieze up. the only way is to use a torch to heat the plug and tap it to make it free. then it can be removed.

Posted on Jan 28, 2009

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Brakes on my 05 trailblazer locked up while driving and the vehicle won't move.


ALL brakes locked up, or just rear? Rear could mean differential is locked up...Sounds more likely while driving it, as cars now have a front or rear valve so all brakes are not lost at one time..

Feb 20, 2015 | 2005 Chevrolet TrailBlazer

1 Answer

Service four wheel drive light on,cant shift into 4wd cold only ,below 45F,drive awahile resatrt the truck it works fine,warm days no problems .


Vehicles: 2002 Chevrolet Trailblazer 4WD 4.2L SFI DOHC 6-cylinder

Your front 4WD Transfer case is low on Gear Oil.
On warm days, the Gear Oil expands slightly, and is less viscous, so the "Service 4WD" light stays off. On colder days/mornings the story changes.

The following paragraph has info applying to the manual differential only:
The 2002 Trailblazer (the first year Chevy made the Trailblazer) has a Front Differential using 1.11 (that's 1 and 1/9th) Quarts Gear Oil, and a Rear Differential with a capacity of 2.29 (thats 2 and 2/7ths) Quarts Gear Oil.
The Gear Oil needed is GM Part No.12345349 or GM Part No.1052931 (they're identical), also known as "GM Synchromesh"(R), which is a type of GLS (Gear Lubricant, Special), also known as "Manual Synchromesh Transmission Fluid 5W30". A synthetic version of which sells for $12.70/qt (USD) at
http://www.amsoil.com/storefront/mtf.aspx

This is not to be confused with 5W30 motor oil (which can be had for $3.00/qt (USD)).

The 2002 Trailblazer 4WD Transfer Case (NV126 Transfer Case) capacity is 0.8 Liters of GM Part No.12378508 (US), also known as "GM Auto Trak II"(R).
Note that one Quart (US) = 0.946 Liter, so 0.8 Liter = 27.06 ounces.

Red Line sells something that they say replaces both GM Synchromesh and GM Auto-Trak II for $12.14/Qt and $44.55/Gal (US) at
http://www.shopwiki.com/Red-Line-MTL-70W80-GL~4-Gear-Oil-%281-Quart%29

13 Manufacturer Recalls apply to the 2002 Chevrolet Trailblazer (model year 2002 was the first year Chevy offered the Trailblazer), and two recalls pertain to the 4WD Transfer Case. Note that one of the recalls applies to only 895 units, so your vehicle is unlikely to be affected by this Transfer Case recall.

2002 Trailblazer Recall ==========================
OCT 17, 2001 ' Recall ID# 54221

Recall Reason POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
Recall Date OCT 17, 2001
Model Affected TRAILBLAZER
Potential Units Affected 78004

Recall Summary
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES EQUIPPED WITH 4-WHEEL DRIVE. THE CALIBRATION OF THE TRANSFER CASE CONTROL MODULE COULD CAUSE INSUFFICIENT HIGH SPEED GEAR ENGAGEMENT.

Consequence
IF THE GEAR IS NOT ENGAGED, THE VEHICLE CAN ROLL WHEN THE TRANSMISSION IS IN "PARK" AND A CRASH COULD RESULT WITHOUT WARNING.

Remedy
DEALERS WILL UPDATE THE TRANSFER CASE CONTROL MODULE CALIBRATION TO INCREASE GEAR ENGAGEMENT. OWNER NOTIFICATION BEGAN NOVEMBER 6, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.

Notes
GENERAL MOTORS CORP. 01064/01065

2002 Trailblazer Recall ============================
SEP 05, 2001 ' Recall ID# 26006

Recall Reason POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
Recall Date SEP 05, 2001
Model Affected TRAILBLAZER
Potential Units Affected 895

Recall Summary
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES (4 WHEEL-DRIVE). SOME OF THESE VEHICLES WERE BUILT WITH A RANGE SHIFT COLLAR IN THE TRANSMISSION TRANSFER CASE THAT CONTAINS CRACKS.

Consequence
THIS CONDITION COULD RESULT IN A COMPLETE FRACTURE OF THE RANGE SHIFT COLLAR AND SUBSEQUENT LOSS OF VEHICLE FORWARD AND REVERSE GEARS, AND THE INABILITY TO MAINTAIN "PARK" POSITION. THIS INCREASES THE RISK OF A VEHICLE CRASH RESULTING FROM UNINTENDED MOVEMENT OF A PARKED VEHICLE.

Remedy
DEALERS WILL REPLACE THE TRANSFER CASES AND UPDATE THE CONTROL MODULE CALIBRATION. OWNER NOTIFICATION BEGAN SEPTEMBER 6, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.

Notes
GENERAL MOTORS CORP. 01061


Read about all (13) 2002 Chevy Trailblazer recalls at:
http://www.internetautoguide.com/10-12-2002-16-1287/2002-chevrolet-trailblazer-recalls.html

Dec 05, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

Which is cheaper to fix,front or rear wheel bearing on 2005 trailblazer?


Front wheel bearings are expensive because they come as an entire hub assembly, but the labor isn't too bad, maybe 1 hour. The rear bearings are relatively cheap, but the labor to get to them is long. The axle has to come out, so that means the differential needs to be opened. The brakes have to be disassembled. Depending what kind of deal you can get a front hub assembly for, the rear bearings will probably cost you more.

Aug 26, 2011 | 2005 Chevrolet TrailBlazer

1 Answer

Our 2003 trailblazer has 63,000 miles. we have followed the scheduled maintenance and changed oil every 3000 miles. We have been told that we need to have the brake fluid, coolant system, front and rear...


I would do the coolant, but the others can go a lot longer.
The differential fluids should not be expensive, but the brakes can be expensive and not really warranted in my opinion.

Sep 20, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

How do you service the front trans axle on 2002 silverado


There is a drain plug and a upper fill plug on the front differential, and believe it's in the passenger side. but i could be wrong on the side. The age thing but you can see both of the plug than you need to drain and re-fill.

2002 CHEVROLET TRUCKS SILVERADO 1500 PICKUP 5.3L 8-cyl Engine Code [T]

Differential, Front / Rear Full time 4WD......GLS ALL TEMPS....Synthetic Extreme Pressure (EP) Lubricant 75W-90 (SVG)

GM part no. 12378557 or equivalent Do not add friction modifier.

CAPACITIES:
Differential, Front..........1.7 liters
Rear differentials
Differential, With 10.5 RingGear Amer Rear..........2.6 liters
Differential, With 11 RingGear Dana Rear..........4 liters
Differential, With 11.5 RingGear Rear..........3.6 liters
Differential, With 8.6 RingGear Amer Rear..........2.3 liters
Differential, With 9.5 RingGear Amer Rear..........2.6 liters
Differential, With 9.75 RingGear Rear..........2.8 liters

Good luck and this should help.


Dec 26, 2009 | 2002 Chevrolet Silverado

2 Answers

Servicing the differential at 18,000 miles?


I have a Chevrolet Silverado with 115,000 miles on it and I have never serviced the differentials, there is a check hole on each differentiall (the front and rear) and it is removed with a 3/8 drive ratcher. Stick your finger in the hole after removing the plug (located on the side of the differential NOT THE BOTTOM) the bottom plug is the drain. If you can feel fluid with your finger, you have enough fluid in your differential. Also, if the differentials aren't wet on the outside, they most likely aren't leaking. I would not suggest servcing the differentials.

Sep 17, 2009 | Chevrolet Avalanche Cars & Trucks

2 Answers

Need to fill Front differential


If you look on the back of your front diff, you will see two plugs, one located on the bottom (for draining only) and one mid way up for adding. Good luck!

May 05, 2009 | 2002 Chevrolet TrailBlazer

2 Answers

What;s the oil capacity for a 2002 chevy trailblazer 4.2 6 cyl?


Here are the Fluid CAPACITIES & MORE:
Engine, with filter..........4.6 quarts[1]
Cooling System, Initial Fill..........12.0 quarts
Automatic Transmission, Total Fill
4 speed 4L60, 60E..........11.0 quarts
Manual Transmission, NV1500..........5.7 pints
Manual Transmission, NV3500..........4.2 pints
Differential, with 8.6 ring gear Rear..........4.0 pints
Differential, with 7.25 ring gear Front..........2.5 pints[2]
Differential, with 8.25 ring gear Front..........4.2 pints[2]
Differential, with 9.25 ring gear Front..........5.9 pints[2]
Differential, Front..........2.5 pints
Differential, Rear..........4.0 pints
Transfer Case,BW4472..........2.5 pints
Transfer Case,NV136/236/246..........4.0 pints
Transfer Case,NP207..........4.6 pints
Transfer Case,NP231, NP233..........2.3 pints[3]
Transfer Case,NV231/233..........2.1 pints[3]
1. After refill check oil level.
2. Do not use synthetic lubricant in axles using RTV sealant.
Synthetic lubricant will chemically atack RTV sealant.
3. Identification: check tag on case.

Apr 13, 2009 | 2002 Chevrolet TrailBlazer

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