Chevrolet Impala SS, Handbook

Page: 70 / 159

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SSHandbook
Maintenance: General Maintenance
21. Get the door panel close to the door and then hook the electrical connector to the window switch back
onto the switch. Carefully lift and tilt the top of the door pad window seal into the top door track, then
install the pad back into the track, paying close attention that the door panel is fitted down in both ends of
the door.
22. Now align the door panel plugs (1 at a time) and pop them back into their holes, then re-install the Phillips
screw at the rear ofthe door panel.
23. Slide the door handle pocket back over the door handle, then pop the pocket back into the door panel and
re-install the Phillips screw.
24. Re-Install the arm-rest and both Phillips screws that hold it on. You’re done!
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Note: All doors are nearly the same process as in this example, but once you've done one door with no
problems, the others will be easier.
Differential Oil Change
When changing the differential oil most people recommend against Synthetic lube with a limited slip
differential (LSD) rear end. They say it’s too slippery to allow posi to work right. Even the most diehard
synthetic user use regular gear oil because of this. Check the option tag in the trunk, if it says G80 you have a
LSD rear end and need to use quality gear oil but not synthetic and use the limited slip additive. If you don't
have a LSD rear end, just use the lube ofyour choice synthetic is ok.
You can do this one oftwo ways:
1. Remove the cover w/ gasket replacement.
2. Siphon the fluid out by the filler hole.
Removing the Cover Technique:
Materials:
• Differential oil 85W90 ­ Synthetic for NO Limited Slip Differential & conventional for positive traction
• New Felpro Gasket
• GM Slip Additive – Available from dealer for about $10
Procedure:
1. Lift the car up on jack stands and chock the front wheels
2. Have a pan underneath the cover to catch the fluid, loosen the bolts by alternating the sides to prevent
warping ofthe cover.
3. When all ofthe bolts are loose, but not out, pry an edge up and allow the fluid to drain.
4. Then remove the bolts and remove the cover.
5. Check to see what kind ofgunk is at the bottom ofthe casing and inspect for any damaged parts.
6. Remove all ofthe old gasket from the cover and housing.
7. Reinstall the gasket and carefully replace the cover. Gradually tighten bolts to torque factory specs.
8. Remove the filler hole cap and add the “GM Slip Additive” then fill the differential with the
recommended oil.
9. Replace the fill hole cap and you’re done.