Question about 1996 Chevrolet K2500

1 Answer

Can the gears be changed from 4.11 to 3.7 w/o changing rear end?

I have a 1996 Chevy C2500. My differential has the full floating axle 8 lug i believe it has 4.11 gears i would like to have 3.7 Can this be done without changing the whole rear end? I get terrible gas mileage and do alot of driving.

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  • Clifford Walls
    Clifford Walls Nov 23, 2009

    this truck is a extened cab with the tow package,it has a 7.4vortec/4L80E,4.10 gears.GVM is 8600 [All stock]I get around 9 mpg,it runs ok,but Ive had 305s with more spunk.I am a plumber and haul less than 1000lbs most of the time.I drive an avg of 150 miles a day.The truck fits my needs except for power and mpgs.[

  • Clifford Walls
    Clifford Walls Dec 12, 2009

    thanks Iryman,but on this full floater the axels come right out.all you do is remove thehub or bearing cap and slide it out.(I know this sounds like ive lost my last marble)I changed my breaks a couple of weeks ago and found out i had to pull the axels to get the hubs off,they bolt from the inside to the bearing housing.The really cool thing about it is you dont have to remove your tires and wheels.

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  • 18 Answers

Yes, you can leave the axle housing installed, but you will have to pull the axle shafts. You will likely have to purchase a specialty tool to do this.

(If you have the massive drums found on the 3500s and some 2500's, this would also be a good time to re-grease your bearings and check your rear brake shoes and change them if worn beyond 50%, since you will have the axle ends taken apart. These drums are very heavy. Do not remove the trapped bearing from the drum.)

To go from 4:11 to 3:73, You only need to swap out the gears in the differential (including the pinion gear) Be sure to check for proper alignment and backlash. Re-install axle shafts. Replace, do not reuse any seals. You may also need to reprogram the trucks shift points for the new gear ratio to maximize efficiency results.

Note: By changing your gear ratio to 3:73 You may potentially decrease your trucks Towing/Hauling weight capacity. Many GM trucks are equipped with an Eaton mechanically locking rear (RPO code: G80). You can find out if yours is so equipped, by checking the label inside the glove box. Personally I prefer the G80.

(I have the 3:73s in My '97 C2500 and average around 10.5MPG city, but long freeway runs can hit 15+MPG. My GVW is 8600LBS, and 10,000LBS Towing capacity. "Stop & Go" driving is your worst enemy with these trucks.)

Consider if all the work involved is worth it in performance gains before going forward.

Posted on Dec 06, 2009

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SECTION 205-02: Rear Drive Axle/Differential - Ford 8.8-Inch Ring Gear 1998 Explorer/Mountaineer Workshop Manual
IN-VEHICLE REPAIR Rear Wheel Bearing and Axle Shaft Oil Seal -4.0L SOHC and 4.0L EI, Conventional
Special Tool(s) swn~us~en~file=st1514a.gif~gen~ref.gif Axle Seal Replacer
T83T-1175-A swn~us~en~file=st1283a.gif~gen~ref.gif Axle Wheel Bearing Puller
T83T-1225-A swn~us~en~file=st1322a.gif~gen~ref.gif Axle Wheel Bearing Replacer
T83T-1225-B swn~us~en~file=st1326a.gif~gen~ref.gif Driver Handle
T80T-4000-W swn~us~en~file=st1185a.gif~gen~ref.gif Impact Slide Hammer
T50T-100-A
Removal
  1. Remove the axle shaft; refer to Axle Shaft in this section.
Axle Shaft Removal
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not use heat to loosen a seized lug nut. Heat can damage the wheel (1007) and the rear wheel bearings (1225).
    Loosen the lug nuts (1012).
    1. Remove the center cap.
    1. With the weight of the vehicle on the wheels, loosen the lug nuts.
  1. Raise and support the vehicle.
  1. Remove the wheel and tire assembly.
    1. Remove the lug nuts.
    1. Remove the wheel and tire assembly.
  1. Remove the axle housing cover (4033).
    1. Loosen the axle housing cover bolts (4346) and drain the rear axle (4001).
    1. Remove the axle housing cover bolts.
    1. Remove the axle housing cover.
  1. Remove the rear disc brake rotors (2C026); refer to Section 206-04 .
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Once the differential pinion shaft (4211) has been removed, turning the differential case (4204) or an axle shaft (4234) will cause the differential pinion gears (4215) to fall out of the assembly. This could result in chipped or damaged components.
    Remove the differential pinion shaft.
    1. Remove the differential pinion shaft lock bolt.
    1. Remove the differential pinion shaft.
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not damage the rubber O-rings in the U-washer grooves.
    Remove the U-washers (4N237).
    1. Push the axle shafts inboard.
    1. Remove the U-washers.
  1. Reinstall the differential pinion shaft.
    1. Install the differential pinion shaft.
    1. Install the differential pinion shaft lock bolt finger-tight.
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not damage the inner wheel bearing oil seal (1177).
    Remove the two axle shafts.
Installation
  1. Lubricate the lip of the inner wheel bearing oil seal.
    • Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-M1C75-B.
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Once the differential pinion shaft has been removed, turning the differential case or an axle shaft will cause the differential pinion gears to fall out of the assembly. This could result in chipped or damaged components.
    Remove the differential pinion shaft.
    1. Remove the differential pinion shaft lock bolt.
    1. Remove the differential pinion shaft.
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not damage the inner wheel bearing oil seal.
    Install the two axle shafts.
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not damage the rubber O-rings in the U-washer grooves.
    Install the U-washers.
    1. Position the two U-washers on the button end of the axle shafts.
    1. Pull the axle shafts outward.
  1. Install the differential pinion shaft.
    1. Align the hole in the differential pinion shaft with the differential pinion shaft lock bolt hole.
    1. Install the differential pinion shaft lock bolt.
  1. Install the rear disc brake rotors; refer to Section 206-04 .
  1. Install the axle housing cover and fill the rear axle housing (4010) with 2.4 liters (5.5 pints) of specified lubricant; refer to Axle Housing Cover in this section.
  1. swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Always remove any corrosion, dirt or foreign material that may be present on the mounting surfaces of the wheel or the surface of the wheel hub or rear disc brake rotor that contacts the wheel. Installing wheels without proper metal-to-metal contact at the wheel mounting surfaces can cause the lug nut to loosen and the wheel to come off while the vehicle is in motion, causing loss of control.
    Clean the wheel hub and mounting surfaces.
  1. Install the tire and wheel assembly.
    1. Position the tire and wheel assembly.
    1. Install the lug nuts and lower the vehicle.
    1. Tighten the lug nuts.
    1. Install the center cap.


  1. swn~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Never remove the axle shaft oil seal by itself. Always remove the rear wheel bearing and the axle shaft oil seal at the same time.
    NOTE: If the axle shaft oil seal is leaking, the axle housing vent may be plugged with debris.
    Use Impact Slide Hammer and Axle Wheel Bearing Puller to remove the rear wheel bearing and the axle shaft oil seal.
Installation
  1. Lubricate the new rear wheel bearing.
    1. Use Thermally Stable Rear Axle Lubricant XY-80W90-QL or equivalent meeting Ford specification WSP-M2C197-A.
  1. Use Axle Wheel Bearing Replacer with Driver Handle to install the rear wheel bearing.
  1. Lubricate the lip of the new axle shaft oil seal.
    • Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-M1C75-B.
  1. Use Axle Seal Replacer with Driver Handle to install the axle shaft oil seal.
  1. Install the axle shaft; refer to Axle Shaft in this section.

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2 Answers

Have a 1996 camaro SS speed. i have replaced the rear end and filled it with mobil 1 rear end fluid with the limited slip additive and it whines at around 70 mph and also vibrates pretty bad.


There are bearings in the rear diff that make a "whining" noise it can be repaired by replacing the bearings. Here is how its done;

1. Jack up the rear end and support if correctly with jack stands.
2. remove the wheels and expose the axles
3. remove the differential cover and drain the differential
4. rotate the main gear inside and expose the take down bolt. (8mm)
5. remove the take down pin in the spline drive. 8mm nut
6. remove the axles and remove the main gear. then take out the bearings.
7. replace the bearings and reinstall the components in reverse order.
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Removal
  1. Raise vehicle and place jackstands under rear frame crossmember. Lower the hoist so that rear axle housing is at suitable working height.
  1. Remove axle housing cover from rear axle housing and drain lubricant.
  1. Perform the inspection before disassembly.
  1. Remove rear wheels, rear disc brake calipers and rear disc brake rotors.
  2. Working through cover opening, remove differential pinion shaft lock pin and remove differential pinion shaft and differential pinion gears (4215). 3fdbe2c.gif
NOTE: THIS IS FREE INFORMATION!!!!
  1. Remove rear brake anti-lock sensor . Push axle shaft inward until u-washers at button end of the axle shaft are clear of side gear recess.
  1. stb~us~en~file=ani_caut.gif~gen~ref.gif CAUTION: Do not damage inner wheel bearing oil seals when removing axle shafts from rear axle housing. In addition, axle shafts should be completely removed from rear axle housing.
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1 Answer

How do you change a wheel seal on a mercury mountaneer 1998 rear end


Axle Vent
NOTE: If the vent cannot be cleared, it must be installed new.
A plugged vent will cause excessive seal lip wear due to internal pressure buildup. If a leak occurs, check the vent. Make sure the vent hose is not kinked. Remove the hose from the vent nipple and clear the hose of any foreign material. While the hose is removed, pass a length of mechanics wire or a small diameter Allen wrench in and out of the vent to clean it. Connect the hose when done. The vent is located on the drivers side top of axle housing.
If you plan on doing most repairs yourself I would suggest buying a Haynes or Chilton manual for your particular vehicle. Or there are some data disks on e.bay($12-$15) For a cost of under $25, you can almost do any repair yourself with these manuals.Also there are online manuals like the site called ALLDATA where guides can be viewed for a fee. All these solutions will save you time and money, and give peace of mind over correct repairs. I can post you some procedures here also.
  1. CAUTION: Do not use heat to loosen a seized lug nut. Heat can damage the wheel (1007) and the rear wheel bearings (1225).
  2. Loosen the lug nuts (1012).
  3. Remove the center cap.
  4. With the weight of the vehicle on the wheels, loosen the lug nuts Raise and support the vehicle. .Remove the wheel and tire assembly.
  5. Remove the lug nuts.
  6. Remove the wheel and tire assembly. Remove the axle housing cover (4033).
    1. Loosen the axle housing cover bolts (4346) and drain the rear axle (4001).
    1. Remove the axle housing cover bolts.
    1. Remove the axle housing cover.
    2. a167554.gif
7.Remove the rear disc brake rotors You will have to remove the brake caliper to get rotor off.
8. CAUTION: Once the differential pinion shaft (4211) has been removed, turning the differential case (4204) or an axle shaft (4234) will cause the differential pinion gears (4215) to fall out of the assembly. This could result in chipped or damaged components.
9.
1.Remove the differential pinion shaft lock bolt. 2.Remove the differential pinion shaft. 4fd1df0.gif 10.CAUTION: Do not damage the rubber O-rings in the U-washer grooves. Remove the U-washers (4N237).
  1. Push the axle shafts inboard.
  2. Remove the U-washers.
  3. 9499075.gif
    11.Reinstall the differential pinion shaft.
    1. Install the differential pinion shaft.
    1. Install the differential pinion shaft lock bolt finger-tight.
    2. 91fc782.gif
      12.CAUTION: Do not damage the inner wheel bearing oil seal (1177). Remove the two axle shafts. 1848771.gif
CAUTION: Never remove the axle shaft oil seal by itself. Always remove the rear wheel bearing and the axle shaft oil seal at the same time. NOTE: If the axle shaft oil seal is leaking, the axle housing vent may be plugged with debris. Use Impact Slide Hammer and Axle Wheel Bearing Puller to remove the rear wheel bearing and the axle shaft oil seal.

0ffed5b.gifAxle bearing puller end..
Installation
Lubricate the lip of the inner wheel bearing oil seal.
Use Premium Long-Life Grease XG-1-C or equivalent meeting Ford specification ESA-M1C75-B.
  1. CAUTION: Once the differential pinion shaft has been removed, turning the differential case or an axle shaft will cause the differential pinion gears to fall out of the assembly. This could result in chipped or damaged components.
  2. Remove the differential pinion shaft.
  3. Remove the differential pinion shaft lock bolt.
  4. Remove the differential pinion shaft.
  5. 5a472e0.gif
    CAUTION: Do not damage the inner wheel bearing oil seal. Install the two axle shafts. CAUTION: Do not damage the rubber O-rings in the U-washer grooves. Install the U-washers.
    1. Position the two U-washers on the button end of the axle shafts.
    1. Pull the axle shafts outward.
    2. 345272a.gif
      Install the differential pinion shaft.
      1. Align the hole in the differential pinion shaft with the differential pinion shaft lock bolt hole.
      1. Install the differential pinion shaft lock bolt.
      2. 49e064a.gif
                                                            Install the rear disc brake rotors; Install the axle housing cover and fill the rear axle housing (4010) with 2.4 liters (5.5 pints) of specified lubricant
                                                            WARNING: Always remove any corrosion, dirt or foreign material that may be present on the mounting surfaces of the wheel or the surface of the wheel hub or rear disc brake rotor that contacts the wheel. Installing wheels without proper metal-to-metal contact at the wheel mounting surfaces can cause the lug nut to loosen and the wheel to come off while the vehicle is in motion, causing loss of control. Clean the wheel hub and mounting surfaces. Install the tire and wheel assembly.
                                                            Position the tire and wheel assembly. Install the lug nuts and lower the vehicle. Tighten the lug nuts. Install the center cap. 6a78fd6.gif WHEW Hope this can help you

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                                                            Want to change gears in rear end for posi traction in a 98 gmc25000 is this possible?


                                                            It is possible, you just have to know what gear ratio you have in your Sierra. I had issues with my son's rear differential and did the Salvage Yard and picked one up for $250.00 with less then 45,000 miles. Remember new cars end up at Salvage Yards also.

                                                            Here are the Pro code for the rear ends to your Sierra and you can match one up at a Salvage Yard.
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                                                            GU5 -- AXLE REAR, 3.23 RATIO
                                                            GU6 -- AXLE REAR, 3.42 RATIO
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                                                            Open Your glove box and look inside it. Should be a list of codes on the bottom.
                                                            Example: GU6 G80 According to that, you'll have a 3.42 posi

                                                            Good luck and keep me posted and call around Salvage Yards, there prices will differ from one to the next salvage yard and don't ask them for a posi rear end. The cost will you more, just search all the SUV's and look at the pro codes in the glove box. Hunt, most awd system SUV will have the G80 rear end.

                                                            Good luck and keep me posted.

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                                                            1999 1 ton rear end axle not engaged


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