GM 12-Bolt Hub-to-Hub width.

[fultz1275]

I'm running a 12 bolt in the 68 Chevelle with C-clip eliminators. I'm going to upgrade to a Moser 12 bolt with "big bearing" tapered press on style bearing. Will the overall Hub-to-Hub length stay the same. I'm also currently running baer brakes in the rear and will be running the same brakes on the new rearend. Just wanting to make sure the overall width will stay the same as I don't have a whole lot of wheel clearence inside and out to account for a more "narrow" or wider rearend. Thanks for any information you can provide.

[TheJDMan]

If you are buying the new rear end direct from Moser, they will make it any width you specify.

[Apogee]

You specify the flange to flange width, also referred to as the WMS-WMS (wheel mounting surface), when having a custom rear end built. The only thing you should add to the equation is the hat thickness for the brakes that you intend to run since these will increase your track width by the same amount. For instance, a C6 Corvette rear rotor measures .280" (9/32") through the hat, so you would want to take that into consideration when specifying the WMS-WMS dimension.

The actual housing width will vary depending on what housing ends you choose along with the associated brake/axle offset dimension. The standard Ford 9" big-bearing Torino (BBT) style housing ends have a 2.50" offset dimension whereas the "Hybrid" GM/Ford housing ends (Moser #7900 or #7900FM) have a 2.75" offset dimension, so your housing width would be narrower with the GM/Ford housing ends than the BBT by 1/2".

HTH,
Tobin
KORE3

[Vince@Meanstreets]

my 68 was 61" axle to axle. Measured at rotor mounting surface. That would be dimention "D".

http://www.moserengineering.com/mose...nk-2.15.10.pdf