rear-end query
06-12-2007, 07:26 PM
#1
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rear-end query Im sure there are 1 million threads similar to this one , but i did scan through and attempt to answer my questions on my own with no real luck . So any help would be greatly appreciated . Car setup is a 99 z28 heads/cam combo . Yank ss 4000 converter , built 4l60-e car weight 3400 lbs. Car dyno'd on a basic tune 400 hp rwhp and 390 ftlbs torque . Still needs much tuning but thats another story. Also nos will be added to setup later , 150+. I would like to make long trips with it and keep the abs/tc.
Here they are
1. Which gear should i use ? i was thinking 3.73's but i would like some opinoins/feedback .
2. Mosier 12 bolt ? or 9inch ? i did some research i know the 9inch's require a little more work to complete the job and abs is not an option as far as i have seen .
3.Who's has the best deals on them a penny saved is a penny earned towards tunning lol.
4.Wich posi unit to use i hear good things about eaton and tru-trac .So im hung as to which to get .
5. Horsepower loss, will there be alot or a little is there a typical % ?
Please any input would be helpfull , thanks
Here they are
1. Which gear should i use ? i was thinking 3.73's but i would like some opinoins/feedback .
2. Mosier 12 bolt ? or 9inch ? i did some research i know the 9inch's require a little more work to complete the job and abs is not an option as far as i have seen .
3.Who's has the best deals on them a penny saved is a penny earned towards tunning lol.
4.Wich posi unit to use i hear good things about eaton and tru-trac .So im hung as to which to get .
5. Horsepower loss, will there be alot or a little is there a typical % ?
Please any input would be helpfull , thanks
06-12-2007, 07:58 PM
#2
1. Which gear should i use ? i was thinking 3.73's but i would like some opinoins/feedback . With that TC, you'd get away nicely with 3.42's if you're looking at driving long distances and plan for a 12-bolt.
2. Mosier 12 bolt ? or 9inch ? i did some research i know the 9inch's require a little more work to complete the job and abs is not an option as far as i have seen . 12-bolt for an auto for sure, especially for long drives.
3.Who's has the best deals on them a penny saved is a penny earned towards tunning lol. Dunno' ... local shop purchased mine from Strange. Since local shops make their money on labor and usually buy frequently form the manufacturers, you'd probably be able to buy cheaper from a local shop than a retailer who makes a profit strictly from selling the product.
4.Which posi unit to use i hear good things about eaton and tru-trac .So im hung as to which to get . I like the Eaton HD ... trotured two of them and never had aproblem from either and the kevlar clutches are good/durable.
5. Horsepower loss, will there be alot or a little is there a typical % ? Depends on your setup, but 5-8% more than a M6 car, which is around 10-12% from what I've seen ... not what's posted here.
2. Mosier 12 bolt ? or 9inch ? i did some research i know the 9inch's require a little more work to complete the job and abs is not an option as far as i have seen . 12-bolt for an auto for sure, especially for long drives.
3.Who's has the best deals on them a penny saved is a penny earned towards tunning lol. Dunno' ... local shop purchased mine from Strange. Since local shops make their money on labor and usually buy frequently form the manufacturers, you'd probably be able to buy cheaper from a local shop than a retailer who makes a profit strictly from selling the product.
4.Which posi unit to use i hear good things about eaton and tru-trac .So im hung as to which to get . I like the Eaton HD ... trotured two of them and never had aproblem from either and the kevlar clutches are good/durable.
5. Horsepower loss, will there be alot or a little is there a typical % ? Depends on your setup, but 5-8% more than a M6 car, which is around 10-12% from what I've seen ... not what's posted here.
06-14-2007, 04:51 AM
#4
I would go with the Moser 9 inch.
http://www.exoticperformanceplus.com....html?item=145
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. Bob
http://www.exoticperformanceplus.com....html?item=145
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. Bob