12 Bolt Rearend - Project Road Rage, V.2

Our Camaro Road Racer Is One Step Closer To Hitting The Track With Our 12-Bolt Rearend From Moser Engineering.

Thomas J. Lyman Aug 8, 2007 0 Comment(s)

In this installment of the newest addition to the Super Chevy fleet of project cars, we show a Moser rearend going in-actually from the Moser manufacturing facility in Portland, Indiana, to the Norco High School kids throwing it up into the bowels of the race car in California.

In the NASA Camaro-Mustang Challenge rulebook, 2007 is the first year anything other than the stock rear housing is allowed, and we figured that in order to have the best chance at even a top-10 finish, we should have the best equipment money can buy for a rearend. For this aspect of the project, we called upon the folks at Moser Engineering. The company's Complete 12-Bolt package was the first recommendation the technical department gave us, and we added to that a set of 3.42 gears, a TruTrac limited slip differential, and an aluminum performance differential cover. These components were chosen for the road racing application we're currently working on, but Moser offers all sorts of other options for rearends-from serious street applications to full-bore drag racing setups. As you can see in the following photos, there's a lot that goes into a complete Moser product, and installation is a fairly straightforward process.

Stay tuned for more on the buildup of the Camaro, and how the Moser 12-Bolt performs on the road course.

Sucp_0707_01_z 12_bolt_engine Bolt 1/23

The Moser Engineering Chevy 12-Bolt Housing unit is a newly designed casting, tailored towards those Chevy owners who want a virtually indestructible replacement rearend. The center section casting is made of nodular iron and the overall section is much stronger than the stock predecessor. At 11/44-inch in thickness, the tubes utilized are 11/48-inch thicker than a stock 12-bolt and have a 3-inch outside diameter. Thicker tubes greatly reduce the opportunity for a bent housing caused by twisting. The housing ends shown are Chevy-style, designed by Moser Engineering, and are CNC-machined forged. The mounts are multi-leaf perches for this particular application, but mono-leaf perches are available as well. Each housing unit is custom made to individual customer specifications. The length of the housing and offset of the perches or the housing itself can be adjusted to fit any application.

Sucp_0707_02_z 12_bolt_engine Tubes 2/23

Press the tubes into the nodular center section and install the breather hole. If you notice, the tubes are welded the entire circumference as opposed to OEM style 10- and 12-bolt housings that use four spot welds.






Sucp_0707_04_z 12_bolt_engine Housing_ends 3/23

The housing ends are then machined or "turned" down to fit inside the housing tubes for added strength. If you notice, the end on the left has already been machined.







Sucp_0707_03_z 12_bolt_engine Breather_hole 4/23

Tapping the breather hole. The hole is added to alleviate pressure from inside the housing, which will eliminate the possibility of blow-by, or blowing out the seals, which causes leaking of the rearend lube. One suggestion to help prevent axle-bearing breakdown is to use a Timken tapered bearing, as opposed to the standard ball bearing setup. The tapered bearing is manufactured to handle greater side loads for both racing and street applications.



Sucp_0707_05_z 12_bolt_engine Fabricated_housing 5/23

The housing is fabricated to customer specification and is now ready for the setup technician to complete the build.










Sucp_0707_06_z 12_bolt_engine Marking_caps 6/23

Chad Franks starts the setup process by marking the caps to ensure they remain with the appropriate CNC-machined side of the housing. Following the caps being marked, Chad thoroughly cleans the tubes, center section, and main cap holes. It's imperative that the housing unit is free of dirt and debris to assure a successful 12-bolt housing setup.



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