Moser M9 F Body Transmission Crossmember for Various Trans

Chrome Moly transmission crossmember come powdercoated satin black or gloss red, with hardware bag

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Weights:

Bare Moser M9 Housing  74lbs

Moser Aluminum Thru-Bolt Centersection with 40S Spool and 3.25R/P  59lbs

Left side 40S Axle with backing plate and E Brake housing  24lbs

Right side 40S Axle with backing plate and E Brake housing 26.5lbs

Torque Arm with all 3 Heim joints and bolts  19lbs

Moser LCA's with Heim joints  6lbs

Moser Panhard Bar with Heim joints 5lbs

Complete Moser M9 with 40spline axles and aluminum Center Section and Spool = 183.5lbs including the E Brake set-up. E Brake is roughly 10lbs total for both housings.

 

 

10 Bolt, 12 Bolt and 9 inch Information

The factory 10 bolt that came in these cars has a very small 7.5" gear.  A variation of this rear was used back in the '70's in the Chevy Monza, then in the Chevy S-10.  GM had to of known they would have warranty claims when they decided to use this rear in the 3rd and 4th gen f body's, apparently the cost of creating a stronger rear was higher than what they thought the warranty cost would be.  This has been a real plus for the aftermarket, as a bone stock LS1 F Body with a manual transmission can break one of these 10 bolt rears!  Many people have tried to beef these 10 bolt rears, spending a lot of money in the process.  What they normally end up with is a rear that still breaks, as everything on these rears is too small.
The 12 bolt rears that are available for these cars is a step in the right direction.  The 12 bolts are well known for being a stout rear that was a factory option back in the day in many performance cars.  You can have a 12 bolt in an early Chevelle, Nova, Camaro, etc, and beat the snot out of it and not hurt anything.  Put a 12 bolt into a late model f body that uses a torque arm, make a couple 4000 to 5000 rpm launches at the dragstrip, and I can just about guarantee you'll have a lot more gear noise on the way home.  The torque arm seems to distort the housing on the 12 bolts, and it seems to happen to all the brands of 12 bolt rears.  This does not happen to the 9 inch rears, and there is no price difference between the 12 bolt and nine inch rears.  As the horsepower in our engines keep escalating, most people these days go straight to the nine inch rear.  The 9-inch has an internal rear-pinion support that also supports the gear end of the pinion to limit gear deflection under high torque loads.  This seems to be the major reason why the 9 inch doesn't start whining after high rpm clutch dumps, when the 12 bolt will pick up noise.  The 9-inch locates its pinion gear lower on the ring gear to improve tooth contact, better the 12 bolt does.  The 9-inch also has a 0.125-inch larger ring-gear diameter and internal pinion support than the 12 bolt.

 

3rd Gen Owners (1982-1992)

You won't be able to reuse your factory 3rd gen brakes with a Moser rear end. You will either have to use GM 4th gen brakes, Moser's brake option that is available here down in the option list, or other aftermarket brakes.

 
Moser M9 F Body Transmission Crossmember for Various Transmissions
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  • Item #: Moser M9 Trans Crossmembers
  • Manufacturer: Moser Engineering
  • Condition: New
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