12 bolt moser vs 9 inch moser

[TransAm]

which to choose for a street strip car, which splines to choose using a spool vs other sections. i am going 4.11 gears and its a th400 3 speed tranny and after winter breaks the car will be in low 10's with this off season motor work. Any opinions are needed and welcome.

[coolmanvette75]

Strictly track? 9 inch, 35 spline axles, spool. Have you considered the mwc fab 9in? Its about the same cost as a moser and a lot stronger/nicer...

[S.J.SLEEPER]

strange s60

[JSPERFORMANCE]

^^^^What he said ^^^^

We also happen to be a WD for Strange and can get you the best deal on the right parts for your application..

[TransAm]

i was looking at strange also but seemed more people ran moser so i leaned to it a little more. I thought a s60 would be overkill for me though cuz how large they are.

you say you are a dealer with them though. How much would i be paying for a complete rear ready to bolt in becuase thats what im looking to do over winter

[JSPERFORMANCE]

The price varies greatly depending on how it is ordered.. Braking system, gear set, billet upgrades.. etc. etc.. You can check out http://www.strangeengineering.net/ to give you an idea of the options.. When you are ready to order it we can sit down and decide what exactly will work best for your application and budget before the order is placed..

[spina74]

I have a moser 9 with abs and tcs...no complaints here

[S.J.SLEEPER]

Originally Posted by TransAm

i was looking at strange also but seemed more people ran moser so i leaned to it a little more. I thought a s60 would be overkill for me though cuz how large they are.

you say you are a dealer with them though. How much would i be paying for a complete rear ready to bolt in becuase thats what im looking to do over winter

alot more people run moser 12's and 9's cuz they been around longer.
the s60 has only been out for a few years.
but hands down...S60 is the best one.
I myself have a moser only because I picked it up a used one cheap right before I was gonna order my S60. Otherwise a S60 would be in my car.

[LTb1ow]

Now I know a 10 bolt is fairly efficient, but oviously not so strong, so how do the three rear ends mentioned here stack up agaist each other efficiency wise?

I would prefer real life type answers from people who own or use em ratehr than internet hear say.

[S.J.SLEEPER]

s60 is about 20-25lbs heavier than the moser 12/9. but its 20lbs makes up for it w/ being bulletproof. your not gonna break a s60. rough guess due to more rotating mass and weight, maybe you'll lose .05secs off your quarter. If your only pushing 400hp than you can go with a basic moser12 for $1700-$1900 + shipping. check with Josh, he can probly put you in a S60 for a good deal and you'll have the peace off mind that you aint gona break it, you won't get the normal moser whine, and you can also put alot morer H.P. to it in the future.

[mc73nova]

My brother has a bolt in Moser 12 bolt in his '91 and put 400 passes on it so far with no issues at all.

[sweetbmxrider]

Originally Posted by S.J.SLEEPER

s60 is about 20-25lbs heavier than the moser 12/9. but its 20lbs makes up for it w/ being bulletproof. your not gonna break a s60. rough guess due to more rotating mass and weight, maybe you'll lose .05secs off your quarter. If your only pushing 400hp than you can go with a basic moser12 for $1700-$1900 + shipping. check with Josh, he can probly put you in a S60 for a good deal and you'll have the peace off mind that you aint gona break it, you won't get the normal moser whine, and you can also put alot morer H.P. to it in the future.

I thought the s60 was the most efficient of the 3?

[S.J.SLEEPER]

Originally Posted by sweetbmxrider

I thought the s60 was the most efficient of the 3?

Josh would be able to verify this. I am going by the fact that the s60 has a larger/thicker pinion and ring and weighs more. Its a known fact that the more weight & physical size of a tire/rear/transmission/driveshaft/etc... it is going to take more hp to turn it and more weight also reduces ets. Unless its got ceramic ball bearing type bearings in it, I cant see it being more effecient.

[SRGN]

12 bolt is the most efficient, I believe the S60 is slightly more efficient than the 9" due to the increased tooth contact on the 9". The 9" in my 98 has a billet center(daytona style pinion support), 35 spline rifle drilled axles with star cut flanges and billet yoke. Best 60' in the car before I got it was a 1.18 on the rear tires, no breakage. My car is also a tick under 3000 lbs w/driver which may be a factor in durability.

[JSPERFORMANCE]

In terms of efficiency the S60's pinion location is better than the 9 inch which makes it more efficient and adds to its durability..
The ring gear is over 9.5" in diameter which makes it stronger than the 9" Ford by design.
The weight difference is only about 25 lbs in comparison.
The rear is a well made unit, every one we have installed has been whisper quiet, and it uses the through bolt design for the torque arm where the Moser 12 housing uses four shorter bolts to hold the torque arm which have the tendancy to work loose and cause major damage.
Normally we reccomend the S60 for anything street or strip. The only time I try to steer people towards the 12 bolt is when they are serious about road racing or where the additional unsprung weight would be an issue and the car is not being launched as hard on a sticky tire.

This is not scientific or a promise that the 60 is "bulletproof" because nothing is, but I have personally fragmented many 10 bolts, 9"s and even hurt a few 12 bolts but the S60 is the only rear I have yet to break personally or even seen one of my customers damage.

[1984camaroz28]

A well setup 12bolt will work just as well as a 9in. I have a 12bolt in my car with zero issues 1.24 60s in a 3000lb car and around 1000hp on spray.

[sweetbmxrider]

Ah ok its the s60 over the 9. I knew it was something like that. They are nice rears for what you get and the 9's have a tendency to beat the snot out of the trans tunnel via torque arm mount. Its lame and I have a small hole from it.

[TransAm]

well i ended up goin with a moser 9 inch cuz it accepts my factory brakes and i can get a third member pretty cheap off a friend and since i couldnt break bank just yet i went with the money saving option but i dont think its a bad choice for my set up. Its more of a car i built to race every now and again but i no the power it has if i need it. I only planned on going 12 in the car but its low 11 now and soon to be mid 10 by spring

i no im commited already with it because its arriving tomorow but should i expect any issues with it going in. Just wondering so i can prepare for it. I ended up only going 31 spline for now because the third member im getting off a friend. Was it a bad choice

[sweetbmxrider]

31 spline should be plenty strong for most, though you didn't specify your power output. Only "issue" I can think of is the torque arm smacking the tunnel, it'll clear itself out

That and I had to get a 1350 conversion u joint to use my stock driveshaft with the new pinion.

[TransAm]

yea im doing the 1350 conversion i was worried about the torque arm but its not a huge issue...power wise is it around 450 now on motor but spray is possible by spring if i dont get 10s with the motor work im getting done over winter..just fine tuning the heads and matching a new cam up with it

[camaroracer1992]

moser 9 inch with 4.10's, detroit locker and 35 spline axles here and aluminum center section. NO issues here. Personally i wouldnt use anything else other then a 9 inch rear.

[TransAm]

so it came in and im checking it out and first thing i notice is they put a drain plug in it and not my fill plug which i asked for...not big deal i can put one in it..

my second thing i notice is when i put on the torque arm bracket and look at it straight on it is super crooked the two holes for the holes are easliy 3/4 inch out of line. Is that how its suppose to mount up or not. Im pretty sure the bolts are straight on my torque arm

i need to find out becuae i cant put it in for another month and iuno how spohn would handle that situation

[shepss217]

yeah it seems like all the aftermarket torque arms have the offset holes like that, not sure of the reasoning for it, worst comes to worst you might have to massage the tunnel a little with a plastic mallet