9 inch, posi or locker

**zero_proto** · 10-15-2008, 07:41 AM

So guys i am talking to one of the guys over at moser trying to figure out what i want for my rear end. Of course i did not want a full spool. But i don't know much about anything with the rear end. I am going to put out about 900 flywheel, and it will be driven on the street alot and hopefully and some track events. Of course i won't run that much power all the time, just turn the boost down.

My question #1 is will a locker be good for some spirited driving through a course?
The guy at moser told me posi won't last that long.

He also asked if i wanted ABS, i thought the 9 inch could not have abs for the f-bods? But he asked me if the ABS was inside or out? I'm lost on that, i am going to call back tommorow, so any help would be much appreciated guys.

It's been so long since i drove a car without abs. Would that be fine for a track car, no abs?

**Midnight02** · 10-15-2008, 08:36 AM

Bump because I'd love to see the answer regarding the posi vs. locker...I've been debating the same.

Regarding the ABS setup, Moser makes a 9" rear that will work with your stock ABS and traction control.

As for driving without ABS, some people prefer it, however there is a good deal of skill involved in threshhold breaking, etc. As for running at the track (straight line I presume), you should be just fine without ABS. Personally, I prefer an ABS setup -- it gives me a greater margin for error as a driver.

**Mr. Luos** · 10-15-2008, 08:56 AM

If it is a track car...get the spool.

**ntimid8r** · 10-15-2008, 09:05 AM

A locker provides a more positive lock of both axles versus a limited slip. But a locker can work against you in the case of normal "around town" driving. It takes more force to unlock a locker so sometimes you'll end up dragging a rear wheel through a turn at the grocery store versus a limited slip will go open differential easier. But when you're racing down the track....a locker will hold both axles longer.
Here's a link to explain it better. http://en.wikipedia.org/wiki/Locking_differential

You can get ABS from Moser on a 9". But from what I've read on the forums it's not always working properly.....intermittent ABS operation. So you get the light on the dash reporting a problem. Has to do with lining up of the sensors on the rearend. I think most guys that go to a 9", aren't getting ABS. My opinion on the matter is I'd rather keep the ABS system...especially for street driving. I opted for a strange 12 bolt primarily to avoid this problem. Not saying a 12 bolt is better, just saying a 12 bolt is a GM product and is going on a factory GM car. I haven't had any ABS issues either. So you can order a 9" with ABS and if it becomes a PITA....then you can buy a ABS delete kit and just remove the system from the car. That way you can give it a try, but will cost you more in the end if you go the delete route. I don't know what is meant by inside or outside either.

**zero_proto** · 10-15-2008, 06:21 PM

dang even though the limited slip is a bit weaker, i really do need it, i love to demolish turns and anything other than a limited slip will not cut it for that. What do you have rich?

**Jays00ss** · 10-15-2008, 06:25 PM

35 spline 9" with a locker here and absolutely love it. It quieted down after the first 50 miles and I hardley notice it at all anymore. Daily drive mine with little to no issues at all. Just takes a little different driving style.

**zero_proto** · 10-15-2008, 07:37 PM

Originally Posted by Jays00ss

35 spline 9" with a locker here and absolutely love it. It quieted down after the first 50 miles and I hardley notice it at all anymore. Daily drive mine with little to no issues at all. Just takes a little different driving style.

how does it handle in the corners

**02blkws6** · 10-15-2008, 10:07 PM

I'll be running a 35 spline spool next season. If it is a fair weather/race car, I'd consider a spool b/c it has less rotating mass and less moving parts than a locker. It it was a DD, limited slip diff is he way to go.

**Jays00ss** · 10-16-2008, 03:25 PM

Originally Posted by zero_proto

how does it handle in the corners

Fine, if you like to hear a click-click-bang-bang and have the rearend do a little shuffle. Again, I like it and doesn't bother me at all. Everyone looks at your car like its a piece of crap but I just laugh. (If they only knew, if they only knew LOL)

**shady milkman** · 10-16-2008, 04:07 PM

Originally Posted by Jays00ss

Fine, if you like to hear a click-click-bang-bang and have the rearend do a little shuffle. Again, I like it and doesn't bother me at all. Everyone looks at your car like its a piece of crap but I just laugh. (If they only knew, if they only knew LOL)

**Zboner** · 10-16-2008, 04:24 PM

I have the spool, if your wanting to put down serious numbers thats the way I would go, and its not that bad to drive at all. and its the cheapest you can go

**Zboner** · 10-16-2008, 04:25 PM

Originally Posted by 02blkws6

I'll be running a 35 spline spool next season. If it is a fair weather/race car, I'd consider a spool b/c it has less rotating mass and less moving parts than a locker. It it was a DD, limited slip diff is he way to go.

I drive mine all the time, but only in good weather obvisouly, and u really cant even tell a difference, just have to take the corners kinda slower then usual

**Zboner** · 10-16-2008, 04:25 PM

U really dont need the ABS

**zero_proto** · 10-16-2008, 04:51 PM

yeah, the guy said that what i would want is a trutrac, i if i want a limited slip. I am going to be weighing the pros and cons, i really want a 9 sec car....so we shall see.

**blownfbody** · 11-04-2008, 06:43 PM

With running with that kind a hp go with whats going to keep you on the track than on the trailer, at 900hp a limited slip rear end should be out of the questions, locker should be the only way to go and if you could deal with it I would spool it buy that my 2 cents

**bigrondownhiller** · 11-05-2008, 01:07 PM

If you are going to drag race I would definately go locker. I think what he means by abs inside or out is whether the abs ring is located inside the housing near the carrier or near the rotors. I think that a 4 channel abs would be out near the wheels. You would have 3 channel if you have traction control.

**SOMbitch** · 11-10-2008, 09:03 AM

If it matters a spool will wear your rear tires faster cause it drags them around turns. It won't handle as well in the twistys either.

**ls1camino** · 11-10-2008, 09:51 PM

About the ABS...if you buy a 9" with the ABS, you you have to reuse your 10-Bolt ABS or do you get new ones with the rear?

**shady milkman** · 11-11-2008, 06:12 AM

Originally Posted by ls1camino

About the ABS...if you buy a 9" with the ABS, you you have to reuse your 10-Bolt ABS or do you get new ones with the rear?

i believe you have a choice..of course getting the new one will be extra money. dont quote me on it...but i believe you have a choice

**slims00ls1z28** · 11-12-2008, 11:28 PM

Originally Posted by zero_proto

how does it handle in the corners

It will make it pull into the turn (kind of like oversteer) if you give it gas into a turn. Drove mine with a 9" and locker all over the place and I live on a twisty ass backroad in TN that eats up rotors in 6 months. So it can handle turns just know if you apply while into a turn it will pull into it further.