I Want a 9 Inch, but God Doesn't!
03-16-2006, 08:23 AM
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I Want a 9 Inch, but God Doesn't! I'm about to drop the major coin and buy a Moser rear axle for my SS. I've been torn between a 12 bolt and a 9 inch for quite some time now, but I like the 9 inch because if I ever want to go all out, ***** to the wall, race only, the 9 inch can be more strongly built than the 12 bolt. So I start investigating...
I want an aluminum center section for weight savings. I'm not even considering the nodular.
I originally would've liked the 35 spline/detroit locker setup...until I drove one! That thing was miserable, and I still like logging street miles with the car. The locker is definitely out, along with a spool (for obvious reasons).
I started looking into posi units, but I don't like putting clutch packs in every year. The car is going to be abused (6k clutch drops at the track, etc), and I want a gear setup that is going to hold up!
...Then I started reading about the Truetrac. Alas! Great street manners, no need to ever replace clutch packs - we have a winner! Or so I thought. I at least wanted a 33 spline setup. No dice! You can only get a Truetrac in a 9inch using a 31 spline setup. No big deal, I'll likely never break the 31 splines anyways.
Guess what? You can't get a Truetrac unit inside of the Aluminum center section.
I'm at my wit's end. I can get a 12 bolt, 33 spline TrueTrac setup, and thats likely what I'll do. I just don't want to spend all this coin and then break the rear end.
My buddy is leaving at 6500RPM in a 6spd car like mine, and has literally bent the teeth on his 4.56 gear! 
I hope I can avoid that problem, as well (I'll be using 4.10s.) His rear end whines terribly on deceleration.
I just wanted to use this thread to vent my frustration in what seems like a never-ending saga to find a 9" that I'll be happy with. I guess it's not going to happen.
I want an aluminum center section for weight savings. I'm not even considering the nodular.
I originally would've liked the 35 spline/detroit locker setup...until I drove one! That thing was miserable, and I still like logging street miles with the car. The locker is definitely out, along with a spool (for obvious reasons).
I started looking into posi units, but I don't like putting clutch packs in every year. The car is going to be abused (6k clutch drops at the track, etc), and I want a gear setup that is going to hold up!
...Then I started reading about the Truetrac. Alas! Great street manners, no need to ever replace clutch packs - we have a winner! Or so I thought. I at least wanted a 33 spline setup. No dice! You can only get a Truetrac in a 9inch using a 31 spline setup. No big deal, I'll likely never break the 31 splines anyways.
Guess what? You can't get a Truetrac unit inside of the Aluminum center section.
I'm at my wit's end. I can get a 12 bolt, 33 spline TrueTrac setup, and thats likely what I'll do. I just don't want to spend all this coin and then break the rear end.
My buddy is leaving at 6500RPM in a 6spd car like mine, and has literally bent the teeth on his 4.56 gear! I hope I can avoid that problem, as well (I'll be using 4.10s.) His rear end whines terribly on deceleration.I just wanted to use this thread to vent my frustration in what seems like a never-ending saga to find a 9" that I'll be happy with. I guess it's not going to happen.
03-16-2006, 10:59 AM
#6
Yeah it took me a while to deliberate on what I wanted.
I know people say that a 9 inch is stronger, and it might be, but it's not like you see stories left and right about people breaking 12 bolts. Really, anything is a mass improvement over what you've got, look at it that way...
I ended up going with a basic Strange 12 bolt, eaton posi, 3.90's. We'll see how it does. I really just want to get my car back together and run some good passes, and be solid and driveable.
I know people say that a 9 inch is stronger, and it might be, but it's not like you see stories left and right about people breaking 12 bolts. Really, anything is a mass improvement over what you've got, look at it that way...
I ended up going with a basic Strange 12 bolt, eaton posi, 3.90's. We'll see how it does. I really just want to get my car back together and run some good passes, and be solid and driveable.
03-16-2006, 11:11 AM
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Same here, it was a complete compromise what I ended up getting (Strange 12-bolt, Eaton Posi, and 4.11s). I originally wanted a 9" with a True-Trac, but the more I researched the more I realized that the trade-offs weren't worth it for me. Too much hp loss, fitment issues. I definitely didn't want an Eaton Posi, but I didn't want a Moser either because of all the pre-assembly required (and a couple other issues), so the True-Trac went out the window too.
I received the Strange a couple days ago and it is truly a beautiful piece of equipment to look at, talk about amazing welds! It looks like I did as good as I possibly could all things considered. You'll eventually finish sifting through all the options and settle on the setup with the compromises you think you can live with. Hang in there!
I received the Strange a couple days ago and it is truly a beautiful piece of equipment to look at, talk about amazing welds! It looks like I did as good as I possibly could all things considered. You'll eventually finish sifting through all the options and settle on the setup with the compromises you think you can live with. Hang in there!
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03-16-2006, 10:25 PM
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i got a 9" moser 31 spline axles w/ a locker....locker locker locker....hmmm wish i had a soft locker it drives fine until you make those things called turns then i go ahhhhhhhhh as the clunking begins and makes all sorts of nasty sounds.....i heard about posis blowin cause of launchin hard but never saw 1 yet....i just wanted 1 that helped with the track and still had SOME drivability....soft locker is way better from what i hear...i have no experience with a 12 bolt though so dont just toss it out the window....sooo in the great words of dane cook....choose wisely!
it drives fine until you make those things called turns then i go ahhhhhhhhh as the clunking begins and makes all sorts of nasty sounds.....i heard about posis blowin cause of launchin hard but never saw 1 yet....i just wanted 1 that helped with the track and still had SOME drivability....soft locker is way better from what i hear...i have no experience with a 12 bolt though so dont just toss it out the window....sooo in the great words of dane cook....choose wisely! 
03-17-2006, 05:06 AM
#13
The Moser 9 inch with 31 spline axles, nodular center section (it's only 15 pounds heavier than the aluminum center) and the Truetrak is a great way to go. We install quite a few of these at my shop, and I have not run into fitment problems. I like the fact that the Moser 9 inch retains the factory two bolt mounting for the torque arm. With the Moser 12 bolt and the Moser 9 inch, the factory driveshaft length is retained, as well as any torque arm you wish to use will work. I have heard of several people saying their factory driveshaft worked, but they felt it was .5" too short, but I haven't ever noticed any problems. I suppose production tolerances could account for any discrepencies. Bob
The tires moan a little going around tight turns, but I wouldn't want it any other way.
03-17-2006, 12:44 PM
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Originally Posted by blue01ta
I find it kinda funny that so many people in this thread are voting for a rearend that they have never used or even seen in action. It does sound like a nice piece of equipment, but at the time so did the Edsel.
Good point, but its been a proven rearend for a LONG time, but not i a newer f-body I guess.
03-17-2006, 12:45 PM
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Originally Posted by blue01ta
I find it kinda funny that so many people in this thread are voting for a rearend that they have never used or even seen in action. It does sound like a nice piece of equipment, but at the time so did the Edsel.
03-17-2006, 01:00 PM
#19
I'm not trying to say anything bad about the D60. I have a couple trucks that employed them and never had an issue with either what so ever. But I also owned and seen some pretty healthy Mustangs running an 8.8, some in the single digits without a problem. But that rear doesn't work too well in our cars. I understand that the previous statement is not exactly the same but it does prove my point.
03-17-2006, 02:21 PM
#20
Who are ya'll talking to about the d60. I'm thinking about something like that. How much more does it weigh...It would be awesome to have a sticky with the pro's and con's of each type of rear-end for the f-body, as well as prices and weights, etc..