Number of Bolts: 10 bolts
Volume: 0.5 quarts over stock
Dimensions: Click here for dimensions.
PML designed and developed this differential cover for the GM 8.0 inch ring gear to add function and good looks. Sand cast aluminum construction and extra capacity aid with heat dissipation on GMC and Chevy trucks and SUVs and the classic straight fins dress up retro Chevrolet SSR roadsters.
- Extra capacity
- Fins for heat dissipation and style
- Heavy duty sand cast aluminum construction
- Drain hole and magnetic drain plug for easier servicing without removing cover
- Thick gasket surface for a secure seal
- Optional machining for a level check hole on face of cover if stock plug is unusable
These vehicles usually have the GM 8 inch ring gear rear differential and may be able to use this PML cover:
- 2002 to 2012 Chevrolet Colorado
- 2003 to 2006 Chevrolet SSR with automatic transmission
- 2002 to 2009 Chevrolet Trailblazer, except SS
- 2006 to 2007 Chevrolet Trailblazer EXT, except SS
- 2002 to 2012 GMC Canyon
- 2002 to 2005 GMC Envoy, except SS
- 2006 to 2007 GMC Envoy XUV, except SS
- 2003 to 2007 Isuzu Ascender (some models)
- 2005 to 2009 Saab 9-7X 4.2L (some models)
Always check your vehicle to verify your differential and clearance before ordering. Configurations vary. Some Colorado trucks, especially those with the 5.3L engine, have the similar GM 8.5, 8.6 inch ring gear differential.
We have had great feedback from many folks with SSRs, Envoys, Canyon, Colorado, and a 2008 4.2L Saab 9-7X owner.
This cover may also work on:
- 2002 – 2004 Olds Bravada
- 2005 Buick Renier
- Many models of Audi, Toyota, Honda, Ford, Subaru
On some vehicles, the housing may be stamped "AAM" for American Axle Manufacturing.
Our thanks to those who have emailed us pictures of their installations.
- 2009 Trailblazer
- 2007 Colorado
- 2006 Canyon 3.5L
- 2006 Colorado
- 2006 SSR
- 2005 Envoy 4.2
- 2005 SSR
2009 Chevrolet Trailblazer
Thanks to Jim at Champion Transmissions in Thousand Oaks (805-495-9312) for installing this differential cover on a 2009 Trailblazer and sending us pictures.
2007 Chevrolet Colorado
John installed this PML 10 bolt cover on his 2007 Chevy Colorado.
An owner of a 2006 Canyon 4x4 with the 3.5L engine installed this PML differential cover. The PML cover provides the Canyon with easier maintenance, increased cooling and strength. The cover is not visible unless you look under the truck so the natural cast finish was perfect for this application.
He wanted to replace the level check/fill hole on the carrier with holes on the PML cover. So the boss on the left (3 o'clock position) was machined as a level check hole although it is about 1" higher than the factory. The owner reported that it is still easy to check with a finger. (If you use this method, be careful not to overfill.) In March 2017, PML added a boss that can be machined at the same location as the stock level check location.
The customer also reported that the brake lines did not need to be moved but there was a small issue with the brake line mounting brackets as they have pressed in bolts which have to be cut off in order to use the new bolts provided by PML. The original stock bolts are too short to reuse. Also the brake line mounting brackets square ends needed to be rounded with a grinder so that they would fit flush to the cover. Neither of these were issues and the swap was quite quick and painless.
2006 Chevrolet Colorado
Erik purchased this PML rear differential cover for his 2006 Colorado. He emailed us with these pictures and said:
My truck runs much, much smoother with the added gear oil capacity. I purchased an "as cast" finish but being a metal fabricator I grained the fins and the side of the mounting flange, masked them off and painted the cover with BBQ black hi temp. Came out beautifully.
Dirk at S-Tec in Kiel, Germany installed this PML differential cover on a 2006 6.0 SSR. This cover has the polish finish.
Click on image to view larger in a new tab or window.
2005 GMC Envoy 4.2 Straight 6
This video shows the installation of a PML 4L60E transmission pan and this differential cover on a 2005 GMC Envoy. There is not much clearance between the pan hard rod and the PML cover but the is no movement of the rod in that direction so there is no problem.
Mike purchased a PML Torsen differential cover and personalized it with black paint on the ribs and bolts. Mike reported that the PML cover "is a very nice piece. It installed easily with no modifications." And Mike has been told that "the cover makes the SSR look great going down the road." Our thanks to Mike for taking the time to email us his comments and pictures.
Drain and Fill
This cover has a fill hole on the top and a drain hole on the bottom. New mounting bolts, a fill plug and a magnetic drain plug are included with the cover.
Optional Machining for Alternate Level Check Hole
The stock level check hole is on the passenger/right side of the differential. If that level check is not usable, this PML cover can be machined with a level check hole. This is an option and there is a machining charge.
When ordered, the circular area on the front face of the part would be machined with a 1/8 NPT. This hole can serve as an alternative level check location. A plug is included.
Images show: (1) PML cover with 1/8 NPT hole on the front, (2) PML cover with plug in hole, (3) Computer drawing of PML cover on a differential and level check location
Always verify that the PML level check matches the level check on your carrier. The owner/installer is responsible for verifying the fit of the cover and fluid levels.
Optional Machining for Temperature Sending Unit
The small, unmachined boss on the right side of the cover at about 4 o'clock can be drilled and tapped for an aftermarket temperature sending unit. Optionally, PML can drill and tap a 1/8 NPT hole in this boss. There is a machining charge.
When PML machines a hole, a plug is included.
The temperature sending unit hole would be for an aftermarket temperature gauge and sending unit to monitor the differential fluid temperatures.
Another Option For Custom Use
There is a large, unmachined boss on the right side of the cover at about 3 o'clock. It could be used as an another fill hole or for something else. It is above the fluid level.
If you want PML to drill and tap this boss, you must call us to order.
Inside of Cover
This part was updated March 2017 to make it easier to machine for a level check hole.
Originally, PML designed this rear end cover for GM 8.0 differentials in response to requests from the Chevy SSR community. Then some Canyon/Colorado owners asked us to have a location for the level check at the level check on the carrier rusted or became unuseable. So we added the additional boss that can optionally be used as a level check.
The owner/installer is responsible for verifying the fit of the PML cover and fluid levels.
PML Differential Cover Compared to Stock
This cover can replace two different stock covers. The stock covers have different depths but the same bolt hole pattern.