[Doug F.]

Anyone that is running 10's or quicker (you too Bob ) at 3500+ lbs. What type of rear and particularly differential are you running?

I will have the HP to go 10's and am upgrading the rear. My car will be driven 10 miles to the track and to the occasional show.

I was going to go strange 60 and spool, but am back considering some type of non-spool device.

Definately going 12 bolt or 60.

How well does what you have work (60'), how much power, have you ever broken it?

I know this has been beat to death, but I have not seen enough good results from detroit locker, and I don't want to be tearing up spider gears, etc.

Durability is my #1 concern with traction close behind.

A spool is a negative on limited street driving.

And I don't car about the rain , ET streets don't work well it anyhow.

 

[BillsCamino]

I've got a 12 bolt, 3.73 POSI, all steel clutch pack with 800 lb springs, welded tubes, Ford style axle bearing cups installed (NO C-clips needed), Moser internals including axles and support cover.
Car weighs 3760 lbs with me.
Probably 85% of the car's use is on the street...although it could be more consistant and quicker (?) with a spool, I'm staying with the posi.

 

[Bob West]

Gee thanks Doug, rub it in a little I'm using a Moser 12 bolt,35 spline axles, and a spool. The rearend worked great til I tried to launch with nitrous the first time and I've had a howl on decelleration ever since(the pinion nut is tight). I'm thinking I might have jolted one of the bearings on the spool. I havent torn into yet, been way too cold to lay on concrete, might dig into it this weekend, right now its supposed to be in the 50's.

edit: forgot the Moser support cover too. I'm not sure if Moser uses billet caps on their 12 bolts or they have to be special ordered.

 

[JOHN WILSON]

Doug,

I'm running the Moser 12bolt with 33sp axles and a spool. My best 60' has been 1.42 with minimal suspension tuning. I've just recently begun upgrading suspension parts front and back and should be seeing some quicker 60' times between the suspension work and a new cam in the works.

If it were available when I bought the Moser I would have gone with the Strange 60.

I've had no issues running a spool on the street with Hoosier slicks, but I've recently put some ET street radials on the car to try out and I'm a little concerned with stressing the studs since the radials have very stiff sidewalls compared to the bias slicks and the compound on the radials is super sticky.

 

[mr68]

mose 30 spline axles, spool, richmond 4.56 street gear, c clip eliminators, 10.77 123 mph. i drive the car 400/500 miles per yr on the street. spool wears out the left rear tire due to dragging around so much. but at the track the spool rules!

 

[mr68]

oh yeah ,standard chevy 12 bolt.

 

[10secBu]

12 bolt, Richmond 4.10 street gears, Mark Williams 35 spline spool & axles, Summers Brothers billet caps on the housing (both sides), Mark Williams billet captured bearing housing ends, LPW aluminum girdle cover, Mark Williams 11/16" drive studs. So far seems to be holding up quite well. Been in service since the mid 90's with limited street driving the past few years.

 

[kjett]

12 bolt, U.S. Gear ring/pinion, Moser 33 spline axles, Moser spool, Moser C-Clip eliminators, Mark Williams billet main caps, welded axle tubes and LPW cover. Works good so far

 

[69bigblock]

Moser 9", nodular case, back braced, detroit locker, 35 spline, 1350 u joints. I have been beating on it at the track and on the street for 4+ years now. Zero maintenance. Easy to change gears to any ratio you want. well over 600 to the wheels on the bottle. Good luck

 

[Nickel333]

I only run 11's but i run a detroit locker. Also i have never heard of somone shredding a detroit locker. You cant go wrong as long as you can deal with the small pop of the opening and closing.

 

[Rmchevelle]

Good thread!

The responses remind me of watching a college football bowl game. You know, when the players each announce their name, the team they play for, and their position. "John Smith, Nebraska, linebacker." In car speak that would be, "Joe Blow, Chevelle, Moser 12 Bolt, U.S. 4.11 gears". Sorry, it just gave me a chuckle!

Rod

 

[JIM]

This may sound like a dumb question, but how do you guys with the GM 12 bolt rears run anything other that 30 spline axles? The basic Eaton posi accepts 30 spline correct? So if I wanted to do an axle upgrade, I would have to change carriers as well?

 

[joespanova]

I've got a 12 bolt, 3.73 POSI, all steel clutch pack with 800 lb springs, welded tubes, Ford style axle bearing cups installed (NO C-clips needed), Moser internals including axles and support cover.
Car weighs 3760 lbs with me.
Probably 85% of the car's use is on the street...although it could be more consistant and quicker (?) with a spool, I'm staying with the posi.

True....so true.......but the car sits in the garage 85% of the time.....AND I'm guessing he'll get tired of the inconsistant 60 ft's and put a spool in there because that aint no 450 horse 454 up front :sad:

 

[10secBu]

This may sound like a dumb question, but how do you guys with the GM 12 bolt rears run anything other that 30 spline axles? The basic Eaton posi accepts 30 spline correct? So if I wanted to do an axle upgrade, I would have to change carriers as well?

There are side gears available for 33 spline axles in a Eaton Posi. But that is as large as you can go with a posi.

 

[Bob West]

You can get Moser axles in 30 spline, but they don't have the warranty the bigger axles have. I had 30 spline axles with my cclip eliminators. I'm sure you can get stock replacement axles w/c clips from any of the axle manufacturers.

 

[JIM]

There are side gears available for 33 spline axles in a Eaton Posi. But that is as large as you can go with a posi.

Thanks Todd.

Hey, what is the deal with those new Detroit TruLocks I see now? Some spiral cut gears without springs or frictionplates???

 

[540Hotrod]

Hey Doug...

I'm using a posi in the Dana 60 IRS setup under my Vette. Long story, but mine is a slightly beefier version of the std. Powerlok that Dana used in the Dana 60's. It's had quite a few (well over 150 I'm sure) launches on slicks with the 540 and a 5 speed without a "slipper" style clutch, lots of street miles up to your part of the world twice now as well as lots of cruising. No issues at all. It's dead quiet..no popping or stuff.

My Vette is 3620 with me in it.

When I was deciding what to make the IRS out of, I looked at ring gear size as a major factor. Figure there is the 8.5" GM, the 8-3/4" Mopar, the 8-7/8" 12 bolt, the 9" Ford, then there is the Dana 60 at 9-3/4"!!! The larger the gears, the more tooth engagement you can get. More engagement= more strength.

Plus Dana 60 uses 4 spider gears as opposed to 2 in a GM. Some Fords use 4 also, but they are much smaller. More gears spreads the load out much better...just like diesel truck transmissions with 2 and even 3 countershafts.

Besides being heavy, one of the biggest issues with old Dana 60's is they are a PITA to setup. You used to have to press bearings on and off to change shims (unless you had "setup" bearings). The Strange 60 uses spanner nuts like a 9" to set sideloads.

One more thing...everyone you talk to always talks about how easy it is to change gears in a 9". Yes, it's great if you have a complete spare chunk laying around. Otherwise, 99% of the folks who tout that as an advantage, never change the gears from the set they originally installed unless they break them.

So, if it were me, I'd stick a big 'ole Dana 60 in it in a heartbeat and never have to worry about it again for the rest of your life! There comes a time when you have to look at strength as the first priority.


JIM

 

[blue66]

Put in a Detroit truetrac and love it. Drives like an open on the street and they told me it will hold to 9's easily. When you get on it hard it always turns both wheels, but you can jack it up and turn one like an open when there is no torque on it.
....12 Bolt, 33 spline strange axles, street series c-clip eliminators, welded tubes, support cover, solid pinion spacer, 3.73 gears.

 

[Doug F.]

Thanks guys!

Ok, someone convince me NOT to get a 60 with a spool?

Anyone ever take a spool OUT for any reason?

Anyone ever break a stud or wear out bearings with a spool?

 

[Bomber '67]

12 bolt, welded tubes with ford ends, eaton posi with 800 lb springs, Tom's Differential Kick Ass axles (not sure, but I think they are 33 spline), 4.11 gears.

This has been on the car for about 6 years now. Thousands of street and highway miles, more than a little drag racing. My best 60' has been a 1.57, the race weight is 3,580 lbs, Mickey Thompson lists 8.9" tread width.

I'm thinking that when I next have the differential gone through that I will use lighter and stonger parts like gun drilled axles etc. I'm not sure what I will do with the posi - my feeling is that it is currently near its max capacity.

Thomas