A few questions about swapping to 12 bolt
10-24-2008, 06:10 AM
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A few questions about swapping to 12 bolt Will a spohn adjustable torque arm from a factory fbody rear end bolt up on a 12 bolt? Will I have to change drive shafts? What else is involved with swapping to a 12 bolt? Will the same control arms work?
Who has the best deal on a direct bolt in 12 bolt rear end set up for ABS?
Who has the best deal on a direct bolt in 12 bolt rear end set up for ABS?
10-24-2008, 08:09 AM
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everything will be a direct swap. strange is ussually a little cheaper than moser but both are good units. the only problem with the strange is they use three bolts instead of two long bolts and they will eventually work themselves loose, so watch out for that if you get a moser. the abs will be fine if you buy the correct rear to match you car but you need to know if yours is 3 or 4 channel abs and order the same type. easy as that, well other than unbolting and reassembly.
10-24-2008, 08:43 AM
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the only problem with the strange is they use three bolts instead of two long bolts and they will eventually work themselves loose, so watch out for that if you get a moser.
huh?
my M12 uses 4 short bolts instead of the two long ones like stock,,im not sure what Strange uses....
10-24-2008, 12:17 PM
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strange 2 long bolts good!, Moser 4 short bolts bad! that back out and and your torq arm warranty is void with that setup! Had a friends bolts back out with lock washers and red loctite!
10-24-2008, 02:57 PM
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Don't forget about the 3 inch u-bolts needed to retain the sway bar and plenty of zip strips for your brake lines and e-brake cables.(Moser 12 bolt) Stock DS would have to have the conversion u-joint as well to mate with a Moser pinion Yoke.
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10-26-2008, 02:24 PM
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EPP has the best pricing on Moser 12 bolt rears. I have the optioned rear cover and 1350 yoke, 33 spline axels are nice too.
For correct alignment of the torque arm, you must grind off the first set of mounting holes. The first set of holes are for a 10 bolt. You grind those off for straight alignment to a 12 bolt.
If you are not putting tires larger than 26" you will be fine with the same control arms. If you are upgrading tires you may need adjustable arms to center the tires in the wheel well.
3 inch u-bolts are ghetto. get the correct mounting kit and weld it up. Do it once and do it right.
For correct alignment of the torque arm, you must grind off the first set of mounting holes. The first set of holes are for a 10 bolt. You grind those off for straight alignment to a 12 bolt.
If you are not putting tires larger than 26" you will be fine with the same control arms. If you are upgrading tires you may need adjustable arms to center the tires in the wheel well.
3 inch u-bolts are ghetto. get the correct mounting kit and weld it up. Do it once and do it right.
10-26-2008, 02:59 PM
#9
Put a 12 bolt into a early Chevelle, Nova, Camaro, etc and you can beat the crap out of it, and not hurt anything. Put one into one of our cars with a torque arm, make a couple 4000 to 5000 dragstrip launches, and I can just about guarantee you'll pick up gear noise. If it is a drag only car, you'll never know or care about the gear noise. Drive your car home from the track, and the noise will drive you nuts. I feel the torque arm stresses the 12 bolt housing, causing distortion. We have never seen this happen with the 9 inch housing.
Exotic Performance Plus strongly recommends the Moser nine inch. This rear is even tougher than the Moser 12 bolt, and the horsepower of the late model F Body cars keeps escalating every year, which requires a very strong rear. With the recent introduction of the 6.2L GM aluminum block and the excellent flowing 6.2 litre heads, the horsepower of these cars is going to just keep climbing at a very fast pace.The nine inch will handle the power, plus we prefer the way the torque arm is bolted to the nine inch in the same way the oem rear-end is attached. (This is the only good thing about the stock 10 bolt...) The Moser 12 bolt uses four short bolts to attach the torque arm, and they have a habit of loosening up, even when loc-tite is used. Why the nine inch is stronger than the 12 bolt. 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, than the 12 bolt does.The 9-inch has a 0.125-inch larger ring-gear diameter and internal pinion support than the 12 bolt does. This is not much of a difference, but it is worth noting.
Here is the rear that I recommend, and it uses two long bolts to connect the torque arm.
http://www.exoticperformanceplus.com....html?item=145 Bob
Exotic Performance Plus strongly recommends the Moser nine inch. This rear is even tougher than the Moser 12 bolt, and the horsepower of the late model F Body cars keeps escalating every year, which requires a very strong rear. With the recent introduction of the 6.2L GM aluminum block and the excellent flowing 6.2 litre heads, the horsepower of these cars is going to just keep climbing at a very fast pace.The nine inch will handle the power, plus we prefer the way the torque arm is bolted to the nine inch in the same way the oem rear-end is attached. (This is the only good thing about the stock 10 bolt...) The Moser 12 bolt uses four short bolts to attach the torque arm, and they have a habit of loosening up, even when loc-tite is used. Why the nine inch is stronger than the 12 bolt. 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, than the 12 bolt does.The 9-inch has a 0.125-inch larger ring-gear diameter and internal pinion support than the 12 bolt does. This is not much of a difference, but it is worth noting.
Here is the rear that I recommend, and it uses two long bolts to connect the torque arm.
http://www.exoticperformanceplus.com....html?item=145 Bob