What is the reality of me getting $1900 for it brake drum to brake drum?
Just looking to stir up some conversation

Not from me, Honey.
How's that for "conversation"??

Truthfully Tom...I could see more in the $1500 range.

 

I was thinking more around 1200.00 since you could buy a new Moser for around 1900.00. I paid 750 for the first 12 bolt posi I put in my car, it was all stock, stock axles, new 3.73 gears, and also had disc brakes.

 

That's what I thought. Just the Mark Williams stuff was $1200+

 

jeez, a couple years ago I spent almost 1100 building a stock parts 12 bolt for my Chevelle. Criminy. It is an early type, narrower than my 70 needs. Sounds like I didn't do very good.

 

Does it fit a Chevelle correctly? If not then I'd say the market is pretty small. Ain't too many 10 sec. Monte's out there.

 

Hi Doug,

Yes it is exactly the same...bolt-in for all 68 to 72 A-bodies.
Just about everything on my Monte is exactly the same part on the Chevelle. Even the exhaust system. How do you think the SS's got that nice round gauge dash from 70 to 72

 

Tom...Wouldn`t the new 35 spline Eaton posi work work well enough?
Just a thought.

 

hmm? Maybe it would..I will check into that..Thanks Steve.

I am so partial to lockers but the Eaton may be an option.

 

A 9" will slow your car down also, i know Eaton will make 33 spline posis.

However you might consider contacting MW about the 35 spline posi setup and see if they have a solution....not all axles interchange, the way MW cuts the splines they might not fit a generic 35 spline setup.

 

Sorry, Tom but I got the new 12 bolt Detroit Locker 35 spline crossed up with Eatons 33 spline setup.

Either way seems strong enough though.

 

Here is what I have found out so Far..

I was always puzzled why there was no 12-bolt passenger car Detroit Locker available...turns out there finally is one.

There is a 33 and 35 spline unit available

According to the listings in Summit the 33 spline comes in two models:

one for 3.08 to 3.90 and one for 4.10 and above - $420 or so each

The 35 spline is only for 3.08 to 3.90 at $610. Summit does not show this one unless you specifically type in the pary number

So of course I have a 4.10 gear and 35 spline axles......

I would go for the 3.90 gear, but I don't know of a Pro-Gear in 3.90 :sad:

So, I buy the 33 spline Locker for 4.10 gear and replace my axles with the 33 splines and sell the 35 spline setup.

or I go to a 3.90 gear and the 35 spline detroit locker

or I put the 9" in and put the Monte's 12 bolt in my chevelle with the old 30 spline setup and lock right i still have and sell the complete 12-bolt I just bought.

So Do the Ford ring gears hold up better than the GM ring gears in the street/strip versions.

I have never had an issue with this before...ever

I don't like the fact that I shouldn't really run the Pro-Gears on the street, many have told me I would ruin them in 10 minutes on the highway, yet I know of people that run them all the time and don't seem to have a problem.

Well that is enough rambling...If we would just get some Snow to plow in my area, I would just buy the 9" and sort it out as it develops..it was 1 year last week since I have plowed any driveways.


Or, I deal with the spool, leave it alone and just drive the Chevelle on the street. Also try the new MT ET STreet Radial with the 30" diameter and hopefully it will hook on my setup...I can always adjust my suspension and put the anti-roll bar in the Monte.

 

Hi Tom,
What was the reason that you dont like the spool rear (besides not turning well)?The Dana 60 in my new Camaro has a posi unit which I am considering upgrading to a spool.My car also will see some street use.
Vinny

 

Really it's just the turning, In my opinion there is nothing more reliable at the track than a spool or a Locker. I have run the Lock Right for 7 years and am so spoiled. Having to drag my rear wheels around a corner frustrates me and I haven't even been on the street with it yet. I only have 4 passes and no street miles on my spool setup and I hated it just driving around the pits and at the turn off at the end of the track.

Maybe it wouldn't be so bad if I had wide tires, but I have no plans to back half my car.

Vinny, in my opinion, if there is any way to run a Locker differential it is the way to go.

 

When I talked to the guy at Richmond he told me that do not recommend driving them on the street, yet there are folks that do it with success. He did say to set them up on the loose side so as to not generate alot of heat and good luck!! Ed has said once you start going this quick with a heavy car, the rear gears become a serviceable item when racing full time(something like that anyway). The guys I race with run the variety, 12 bolts, 9", Danas, and they all break sooner or later. Everyone keeps gettin quicker and parts are gonna break, especially when you choose to race a heavy car.

 

I agree Bob and Ed and I have talked about this a few years back.

I have no problem with replacing them every year...

What my main goal is to try and defend against the worst case situations such as towing 5 hours to Maple Grove, entering the race and then breaking in the first round or a time trial.

I just barely got 1 season out of the 3.73's and then they broke. With the 9" I can pull the carrier on my back and change the gears on the workbench..I have to say that is what is driving me towards the Ford...a 3.90 pro-Gear is available for the 9".

With a 29" tire and a 3.90 gear I can be back in the RPM range I want to be. Until I freshen my motor and use Billet Rods this time, I am leary of spining it past 6800....and it hit 7000 last time out with the 4.11's and 28" tire. I can't fit a 30" ET Street Bias Ply in my wheel well width wise.

Thanks Bob

 

The advantage to the 9" setup is the second pinnion support. Pinnion sits in two bearings, lash never changes once set up. Setting up the rear is also easier, there are no shims involved, you set the backlash by threading in the bearing retainers for lash and preload. Yes you do have the advantage of an easier gear ratio swap without havin to set up a rear and asuming you have another carrier ready to go - trust me, it's not something you will ever actually do at the track lying on your back in the pits. The other big advantage of the 9" is the axle bearings/retainer. But now that you have already done this to your 12 bolt, it is a mute point. Bottum line is, it's much easier and in the end less costly to build up a 9" from the beginning for a perf. rear. Take away the second pinnion support and it's a toss-up.

 

the disadvantage to a 9" is that it will certainly slow your car down.

Tom, i think you might need to decide weather you want a street car that you race, or a competative race car.

With a 12 bolt i can swap gears in about 2 hours, i dont see it as being worth spending nearly $2k to do it in about the same amount of time... except on a work bench.

9" break also.

 

Slow down Yeah I agree, but how much .10 or 1 mph. I can live with that since I really don't see this car regularily in the 9's due to all the license stuff and I can get that back if I run it at E-Town or Atco

No lifts anymore..Both friends sold their businesses...and on my back is not fun anymore.

2 hours ? I guess that's possible with a spool and if you get the pinion depth right the first time and don't need to clean the old gasket off. My problem is no lifts hopefully soon though (the plan is a bunch of us are chipping in for one at my friends new pole barn garage.)

The net cost would only be around 1k or likely less since I still have a lot of value in the components I would be removing. The raised ears on the new rear would allow me to use my no-hop bars on the Chevelle saving some $ there too.

One thing for sure when you have 3 kids 11,7,5 and coach football, time many times means more than $ so there are a lot of factors involved.


I really appreciate the opinions, comments and suggestions, from Everybody !!
Thanks

 

why does a 9:ford rear slow you down?

 

It has to do with how the pinion gear is mounted in the housing in relation to the ring gear. The 9" pinion is lower than a 12 bolt, not sure where a Dana 60 comes in. Its a parasitic loss, yet a loss nonetheless.

 

i do it without a lift, i do it on my back in the garage....i have a few tricks but hey the decision is yours to make.

I've heard 2 tenths roughly.

 

LOL....it suk$ getting older.. I avoid working on my back as much as possible..

 

I went from a posi 10 bolt to a Dana 60 spool, same gears and engine last year.

I wouldn't call this a good A-B test as the car hasn't hooked well yet, but the 10 bolt was run in decent air and the Dana so far in poor air. I'd say I lost about a solid 1 MPH. Trans broke when the fall air came and I didn't get it fixed.

I've got a T400, Dana 60. I DON'T want anything to break. I like to race, and give up some ET/MPH for some reliabilty.