Moser a good choice? Or go S60? - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 44 (permalink) Old Aug 25th, 16, 6:46 PM Thread Starter
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Moser a good choice? Or go S60?

Currently in the process of getting my LSA/4L80e swap in my 1972 Chevelle completed. Once done, the car should have around 750 fwhp and 700+lb/ft torque. I currently have a stock 12 bolt w/ Moser axles and stock posi unit. Car is 100% a street car. Do you think a Moser 12 bolt w/ 33 spline axles and trutrac is a good way to go? Or get the bigger/badder S60 w S-trac. I know the S60 is stronger in every way and cheaper but I like the fact the Moser 12 bolt has taller ears for better rear end geometry, is lighter and more efficient. Thoughts?
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post #2 of 44 (permalink) Old Aug 25th, 16, 8:18 PM
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Re: Moser a good choice? Or go S60?

For me it was a easy choose

After some Researching it appeared the S60 by Strange was the best chose for me;
1. I want to cruze in my car, 100 miles one way to my brothers place
2. I want to go to the track every weekend, weather permitting
3. The S60 is the lesser parasitic of the 3 Rearends and is the strongest
4. plus changing to a higher # gearing, 3.55 12 Bolt to a 3.70 S60, at no extra cost,
meant possible faster ET times in the 60' an 1/4
5. the weight difference was not that much, and at least it was in the right place, right over the Tires
6. picked the TrueTrac/Worm Gears, which means no more rebuilding the 12 Bolt for Springs/Shims
7. the Ears I believe are Taller also on the S60 from Strange
8. the prices are all in the same ball park

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60' = 1.756 1/8 = 7.815 et / 89 mph
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60' = 1.720 1/8 = 7.747 et / 89 mph
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post #3 of 44 (permalink) Old Aug 26th, 16, 10:33 AM
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Re: Moser a good choice? Or go S60?

If you just want to stay with something that looks original then the Moser 12 bolt is a good choice. It's a lot stronger than the original 12 bolt.

The S60 is a good strong rear end at a good price. One thing that you need to keep in mind is that you can't go higher than a 3.54 in the 60. There are no 3.08, 2.73 or any other gears in that range for this rear end. You probably won't care because you have an overdrive transmission.
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post #4 of 44 (permalink) Old Aug 26th, 16, 10:44 AM Thread Starter
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Re: Moser a good choice? Or go S60?

Keeping original looking does have a little importance to me I guess. Prolly why a 9" isn't on my list I just want to make sure the Moser is up to the task. Both are a cool $3Gs so I want the money spent only once
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post #5 of 44 (permalink) Old Aug 26th, 16, 12:08 PM
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Re: Moser a good choice? Or go S60?

If it's only a street car then the 12 bolt will be fine. 700 HP is getting close to the limit of the 12 bolt, so if you plan on putting slicks on it then you might think about the 60.
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post #6 of 44 (permalink) Old Aug 26th, 16, 12:10 PM Thread Starter
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Re: Moser a good choice? Or go S60?

For *****s and giggles, I emailed quicktime performance as they are only 1.5 hours from me. I hate the thought of putting a Ford item on my car but if the price is right!
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post #7 of 44 (permalink) Old Aug 26th, 16, 12:33 PM
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Re: Moser a good choice? Or go S60?

For street use you won't hurt any of them.
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post #8 of 44 (permalink) Old Aug 26th, 16, 9:36 PM
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Re: Moser a good choice? Or go S60?

Quote:
Originally Posted by KaiserLT1 View Post
For *****s and giggles, I emailed quicktime performance as they are only 1.5 hours from me. I hate the thought of putting a Ford item on my car but if the price is right!
I felt the exact same way, so that's why I went with the Moser. However if you think about it, the aftermarket 9" rears have nothing Ford about them.
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post #9 of 44 (permalink) Old Aug 26th, 16, 9:59 PM
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Re: Moser a good choice? Or go S60?

The big power people I know shy away from Moser, Strange seems to be in the big cars.

A friend of mine has a blown '66 Impala. He shattered the 12 bolt when he had like 600hp. He went with a Dana 60 and he's fine now at 850hp. He had a friend always yelling at him for getting "that heavy assed Dana" until HE broke his 9 inch at 600hp. Come to think of it, I broke the gears in my 9 inch back in the 80's in my Monte (600hp/600tq at flywheel).

At your power level, get the Dana. From Strange. You'll sleep better.
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post #10 of 44 (permalink) Old Aug 27th, 16, 2:13 AM
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Re: Moser a good choice? Or go S60?

For a "100% street car" like you've stated, any one of the rear ends will take 700 HP easy since you'll never get enough traction in first gear to break anything in the rear end anyway. Even with drag radial tires you'll be lucky if you can even use half throttle in first gear without tire spin. BTW the S-60 rear has mounting ears for the upper control arms that are 1.5" taller than the ears which were on the factory GM 12 bolt rear that I took out of the car. I installed the Strange Engineering S-60 in my Chevelle. It's nice to know I have 35 spline axles, and a 9.75" diameter ring gear back there, but it's a street/strip build, NOT a street only car like yours is.


The one negative thing about the S-60/Dana 60 rear is that the pinion seems to be higher than that of a Ford 9" rear. So if you ever decide to lower the ride height, it can get tougher to obtain the correct driveline angles for U-joint longevity with the S-60 rear. I had the S-60 rear delivered to me with the optional 11" diameter rear disc brakes installed, which was a nice add-on. I also chose the 5/8" diameter wheel studs, Big Ford housing ends, and the heavy support cover.

70 Chevelle SS clone (632 CI powered).
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post #11 of 44 (permalink) Old Aug 27th, 16, 3:14 AM
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Re: Moser a good choice? Or go S60?

Quote:
Originally Posted by BillyGman View Post
For a "100% street car" like you've stated, any one of the rear ends will take 700 HP easy since you'll never get enough traction in first gear to break anything in the rear end anyway. Even with drag radial tires you'll be lucky if you can even use half throttle in first gear without tire spin. BTW the S-60 rear has mounting ears for the upper control arms that are 1.5" taller than the ears which were on the factory GM 12 bolt rear that I took out of the car. I installed the Strange Engineering S-60 in my Chevelle. It's nice to know I have 35 spline axles, and a 9.75" diameter ring gear back there, but it's a street/strip build, NOT a street only car like yours is.


The one negative thing about the S-60/Dana 60 rear is that the pinion seems to be higher than that of a Ford 9" rear. So if you ever decide to lower the ride height, it can get tougher to obtain the correct driveline angles for U-joint longevity with the S-60 rear. I had the S-60 rear delivered to me with the optional 11" diameter rear disc brakes installed, which was a nice add-on. I also chose the 5/8" diameter wheel studs, Big Ford housing ends, and the heavy support cover.
Could not agree more. When you add slicks and a tacky surface it becomes a different ball game. This '67 Camaro had a factory 12-bolt housing in it and has been a race car for most of it's life...probably a million quarter-mile passes on it lol. The leaf spring perch's had been modified at some point in it's life and the housing was always about a half inch off to one side with no ill effect. We were in the middle of a refurbish on the car and my partner decided to spring for a new Moser bare housing...no real gain, but the housing is now centered under the car as it should be.

Engines used are from 450 to 700hp with auto transmissions. 60' times vary from 1.30 to 1.45 depending on engine installed using 30x9 radial slicks. About the only time I see a 12-bolt needing help is if using a stickshift and high rpm launches...a little reinforcing helps. Does not seem to matter who's gearset you use with a stick car they just eat ring and pinions...automatics are easy. Can't see a nickles difference in anyone's offering in a 12-bolt housing. If one is having a problem with a 12-bolt on the street it will usually be a bad set-up of the ring/pinion rather than the housing...even with 30-spline axles.


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post #12 of 44 (permalink) Old Aug 27th, 16, 9:15 PM
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Re: Moser a good choice? Or go S60?

Nobody mentioned this, so I figure I would. The Dana 60 gears are still made by Dana and are OEM quality. This means much quieter gears than 12 bolt or 9" gears.

Andrew
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post #13 of 44 (permalink) Old Aug 28th, 16, 11:18 AM
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Re: Moser a good choice? Or go S60?

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Originally Posted by andrewb70 View Post
Nobody mentioned this, so I figure I would. The Dana 60 gears are still made by Dana and are OEM quality. This means much quieter gears than 12 bolt or 9" gears.

Andrew
FWIW, I don't know if this still applies to this day, because maybe things have changed in the past 15 years, but a buddy of mine had a 70 Chevelle with 4.10 gears from Richmond, and they sure did make a whole lot of whining noise. I got a few rides in that car, and the rear end gears whined so much it was like being in some type of delivery truck made to carry heavy loads. And I don't believe it was due to the gears being set-up incorrectly, because if that were the case, the rear end would've likely failed within a 1,000 miles, (as far as I know). Several years afterwards when I was contemplating a rear gear change in my Vette, I called Richmond about that, and they told me that all their rear gears that are numerically higher than 3.90 will whine even when they're set-up correctly, due to the way they manufacture them. That didn't sound very impressive to me.
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post #14 of 44 (permalink) Old Aug 28th, 16, 12:03 PM
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Re: Moser a good choice? Or go S60?

Quote:
Originally Posted by BillyGman View Post
FWIW, I don't know if this still applies to this day, because maybe things have changed in the past 15 years, but a buddy of mine had a 70 Chevelle with 4.10 gears from Richmond, and they sure did make a whole lot of whining noise. I got a few rides in that car, and the rear end gears whined so much it was like being in some type of delivery truck made to carry heavy loads. And I don't believe it was due to the gears being set-up incorrectly, because if that were the case, the rear end would've likely failed within a 1,000 miles, (as far as I know). Several years afterwards when I was contemplating a rear gear change in my Vette, I called Richmond about that, and they told me that all their rear gears that are numerically higher than 3.90 will whine even when they're set-up correctly, due to the way they manufacture them. That didn't sound very impressive to me.
I went with Motive Gear and 3.42 gear and it's making some noise. I also have a 9" Ford rear in my Cougar with OEM 4.33 gears and it is dead quiet.

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post #15 of 44 (permalink) Old Aug 28th, 16, 12:50 PM
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Re: Moser a good choice? Or go S60?

I can shut the car off and coast down the return road at the track and no whine...5.14 Richmond gear with at least 200 passes.

Rich

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