Hi, I'm getting a 12 bolt rearend from moserengineering for my 97 camaroz28. Anythoughts on whether to get the bolt on axles or the c-clips?
Thanks!

 

Bolt in axles are the only way to go. If you ever break an axle, it may save you a bunch of body work!
On another note. If you are going to be running aftermarket wheels and tires, you might want to consider getting the axle for a 1982-92 F-body. It will be a little narrower, but bolts right in. The advantage is that it is lighter and allows you to run wheels with a 5" back spacing.

Good Luck.

Daren

 

Good advice! Moser (or Strange) will make the width you specify at no extra charge. If I'd known this when I bought mine I would've strongly considered 2" narrower. That would open up the wheel choice, at least as far as race wheels. In addition to more choices, wheels with more offset (less BS) look a lot nicer, IMHO. However, if you already have wheels you like, you would need to replace them.

And definitely lose the C-clips!

Rich Krause

 

NHRA requires "C-clip eliminators" for cars running faster than 11.00 and any car with a spool. I'mn pretty sure Strange includes the bolted axle retainers on their base 12-bolt. Are you saying Moser charges extra for these?

 

Nope. Bolt-in axles were standard on the Moser package I bought, and that was a couple of years ago. Only options were the upgraded posi, upgraded axles, cover, and ABS (all of which I purchased).

Just say no to C-clips.

 

i dont think i fully understand this. what is narrower, the housing?

 

Yes in a manner of speaking. The tubes and axles are what is shorter. Technically. the tubes that carry the axles are part of the "housing". But the best way to think of it is that the axle flanges are closer together.

Fred: when I bought my Moser they charged extra for "C-clip eliminators". Now I think they all come this way.

Rich Krause

 

^~ what he said

 

so with a 12-bolt you cant run some of the wheels that you can with the stock one.

 

If you order the 12-bolt unless you specify otherwise it will have the same flange to flange dimension as your stock rear and you will have the same wheel fitments as stock. If you order it narrowed you will have a much wider choice of drag race wheels but will have some trouble with fitting road wheels.

Rich Krause

 

Thanks,
this helps. Yeah, it's a $100 more from moserengineering for bolt on axles without the clips. And 100 more for 33 spline instead of standard 30spline. I went ahead and ordered the bolt on axle rearend.

 

I'm about to purchase a 12 bolt and hadn't considered getting it narrowed. I just purchased a set of fikse FM5's with ZR1 backspacing, and they stick out a bit. How narrow should I go? 1" might fix it, and I'm pretty sure 2" would be to much. I don't want to overshoot here. Thanks
Malcolm

 

How much clearance do you have from the tire to the inner part of the fender well? That's the critical distance. If it's already close, you don't want a narrower rear end unless you are willing to do some clearancing.

Fikse wheels

Rich Krause

 

Currently the wheels have 335's on them (I plan to run 315's) and they do rub a bit. I thought that a 17x11 with the grand sport offset would fit wich I believe is 7 3/4" compared to 7" for the ZR1 (not positive). If by clearanceing you mean hammering I wouldnt be offended. If it gets more complicated I'm not sure, I just don't want them sticking out if it's avoidable.
Malcolm

 

"GS" offset is 50mm, with a 7.93" backspace. The ZR1 offset is 36 to 37.5mm (varies with some aftermarket models), making the backspace about 1/2" less or 7.40-7.43".

The main problem with backspace availability is trying to run 15x10's. The nice ones like the ConvoPros (and many others) aren't available in anything more the 5" BS. So you get stuck with AutoDrags, Pro-Stars, Draglites, or $350/wheel Bogarts.