I suggested the 9" for it's ease of servicing, reliability, and it's weight (in comparison to the S60).

 

As of right now it would have to be done either by the op or contracted to someone by the op as there are no companies doing a bolt in 8.8 for the f bodies. Personally I'd contact local rearend place that I know of and probably have them do it. In actuallity it's not that hard......All that really needs to be done is swap the tubes from the 10 bolt to the 8.8 then add a provision for the tq arm. Axles are cheap enough and the 8.8 has withheld well over 1K hp in the mustangs....

Again this is just my opinion and what I would do but I'm cheap and really like being different....just me though....Kinda a nice little alternative option....

 

think about what would cause a rearend to pick up gear noise after a few hard launches. Then think about what a 10 bolt, 12 bolt, s-60, and 8.8 all share in common. That's why I went with a 9"...

 

The S60 is more efficent than both the 12 bolt and the 9" rear. So its a trade off in the S60 vs 9" debate. Either you get a heavier rear that will put more HP to the ground, or a lighter rear that will rob more HP.

FWIW I'm not stating one is better than the other, just adding something for the OP to think about.

 

https://ls1tech.com/forums/gears-axl...high-tech.html
Check this comparison out that GM High-Tech did.

http://shop.brutespeed.com/Moser-Eng...ar-Ends_c4.htm
Here is a link to my Moser prices. Bob

 

That GM High Tech article is making one VERY big mistake. People need to understand how easy it is to spin ANY rear end after it has 50,000+ miles on it. The car that went from a 10-bolt to an S60 might have had a "tighter" rear in it than the second car that went from a 10-bolt to a moser 9. If you go from a well worn rear end to a brand new rear end, you will lose some hp. If they would have done a back-to-back from the S60 to the Moser 9 then it would be valid. When we took my 10-bolt out (110,000 miles on it) you could spin it with one hand quite easily.

 

Good info on the spooled rear end for street/track. I am going to drive mine maybe 3 times a week, so I might go with the s60 with spool. I am willing to bet thew car will get less than 5k-7k a year. This is my non daily driven car, so it would be better I think.

 

Spool would be a perfect choice for you.

 

Yes, the 12 bolt has the least power loss compared to the 9 incher and S60. This chart shows the differances in 20 HP steps. I think the total differances are 5 HP.

The 9 inch rear has an additional pinion support bearing on the rear end of the pinion shaft.

 

not trying to be an A$$ but when did this thread turn into 9 in and 8.8 or what rear is more efficient. I wanted to hear what people with S60s choose and what they needed to install

ok I drive the car maybe 3K a year but is a spool really gonna be a pain to drive. never driven or drove in a car that had a spool but "heard" its a pain and normal 2 point turns end up being 5 point turns to get into parking spots or out of tight places

its not a pro street car but want reliable traction when at the track

main goal isn't weight more like cost and the ability to race without a scare everytime im at the staring line

 

The discussion is giving you options to consider.

There is not a "one size fits all" solution to this, as each has benefits/drawbacks to consider...

 

Easy there, bucko. It's just giving you more food for thought.

A spool isn't bad on the street at all if you're an automatic. 6-speed guys have a bit more difficulty, but overall it's not bad.

"Reliable traction" comes from suspension, gearing, tire choice, and drivetrain, not the rear axle type. Traction doesn't care what type of rear you have - just as long as it doesn't break.

 

Naaa, you’re not being an ***, quite right, you asked about the S60. It’ll be the strongest rear you can put in these cars. And probably the least expensive.

I think a few of us were just trying to point out that it’s your heaviest choice and you may not need it as your stated power level.

 

I stand corrected! M9 is the way to go.

 

I agree it would have been better if they would have done back to back tests with the same car. I figured the 9" would eat more than 5rwhp over a 7.5" 10 bolt.

 

It took about 1.5 hours to install, it bolts right in. You need a new driveshaft. I got a 3.5" chromoly one from Fleet Pride (they are local to me) who does work for Denny's Driveshaft.

Yes, tight turning is a little more difficult. If you want a car that is easy to park I would suggest a SmartCar, lol. Honestly it's not too bad. I usually park away from other cars if I go somewhere so I dont really notice it.

The spool is substantially stronger than ANY posi unit ever made. You will know 100% that both wheels are driving with the equal amount of force at all times. The spool costs less and weighs A LOT less, it's the best choice for a car like yours.

Like I said mine was well under $2K with added options. You will not break a Dana60 unless you are running a 550+ inch motor on nitro.

 

geting a spool is sounding pretty good to me right now as the car is only driven on very nice days and feel if I never get a spool then I'll never know what I am missing or wish I missed LOL

As for street driving will the spool eat up the axles or will the tires just slip... need a more in depth description of driving with a spool

I have talked to guys with lockers and stick they say its intresting when racing and shifting as the locker unlocks in between shifting

 

The spool eats up tires not hard parts. Its like a locker as both axels turn at the same time all the time, it doesn't have a preference for load.

Spooled MWC 9" is looking like a good option, get the rear backbrace welded up and you have a bulletproof rearend.

 

I just dont know if I like the idea of the torque arm mount and with my car lowered the chances of that upper mount putting a hole in my floor is high. Also I have a BMR adj CM torque arm that I don't want to spend more money on their design.
And the 9in is offset to the side which will put the torque arm closer to the tunnel. I have a friend that got the MWC 9" and had nothing but problems which aren't completely resolved currently whether on his end or MWC end

 

Wait, you want your TQ arm on your trans shaft vs your tunnel? The 9" mount is a PITA from what ive read, you have to clearance your body for the upper part of the mount on the center section.