1fastWS6

iTrader: (3)

Well, that exactly what I told the Tech at Randy's, to which he replied "hmmmm, good point".

I'm going to talk to TrueTrac today and I'll report back.

1fastWS6

iTrader: (3)

According to TracTech the pressure angle on the older (6mon. to 1yr. and older) Moser axles is 30* and that's what their splines match. They said Moser has recently switched to an "industry standard" 45* pressure angle. So basically, a new Moser or Strange axle will not work with the current TrueTrac diff. TracTech is retooling the splines now though to match the 45* angle. Those will be available soon.

Also, the 4 series, 33 spline version is not in production yet. Could be 6 months or more. You'd have to use a 3 series and a thick gear.

I think I'm just going to rebuild the Eaton for now assuming the case is still salvageable. Might get the spiders cryo-treated too just for added insurance.

02 Silver Z

iTrader: (8)

What he said.

NOZR1

iTrader: (5)

I was thinking the same thing. That's what I plan on doing if mine ever goes.

1fastWS6

iTrader: (3)

Yeah....that'll be a bunch of fun driving around on the street too. Not 4 me.

NOSjohn

iTrader: (9)

You must have heard some old wives tales huh? Driving on the street with a spool is no more difficult than driving on the street with a locker. Keep you tire pressure just 2 or 3 lbs. under recommended and you have no issues. I've done it for 3 years. I know dozens of people with 8,9 and 10 second cars that have done it longer than me. It's all in how you drive.

I suppose you don't wear white after labor day either.

jerflash

ya im going with a softed locker in my 12 bolt and it that blows then spool time

2MuchRiceMakesMeSick

I also street my spool daily

I remember when I was told that "the trex is too big for the street and so is a spool" then I bought one of each and street it daily

1fastWS6

iTrader: (3)

So, with 295-35-18's on the back and driving the car 8k miles or so in a year, in dry weather only, I should go with a spool? I guess a spool is only a $200 gamble. If I don't like it I can just pull it and put a posi back in.

Found out last night that the case on the posi is pretty much trashed also. The carrier bearing was spinning on the housing for some unknown amount of time.

NOSjohn

iTrader: (9)

It's your choice. It's either that or keep spending the same money over and over on axles, cases, posi's, gears, and such. You're going to have some good stock in scrap metal. I'm sure some local yards are looking for all the "per ton" scrap they can melt down.

matts22

iTrader: (2)

I was wondering, would the physical size of the locker in a 12 bolt make it less strong than one in a 9 inch? That may be something to ask Tractech. Because very few that I have heard about have broken a locker (in a 9 inch) or the actual 12 bolt. Most have broken the posi. So if a locker is going to be as strong and much more streetable (especially a soft locker), why would you go spool? Also, is this your daily driver? In other words, can you wait 6 months for the locker to come out? Could you get by with your old 10 bolt for teh time being? Either way, I wouldnt go back to posi unless it is pretty cheap. But back to my original question, would a 12 bolt locker be as strong as a 9 inch locker?

1fastWS6

iTrader: (3)

Problem is nobody has a true locker for a 12 bolt w/ 33 spline axles. The TrueTrac isn't really a true locker, and it's so new that not many people are running one.

I'm putting the stock rear back in for the winter until I decide what to do with it.

2MuchRiceMakesMeSick

[QUOTE=matts22]I was wondering, would the physical size of the locker in a 12 bolt make it less strong than one in a 9 inch? That may be something to ask Tractech. Because very few that I have heard about have broken a locker (in a 9 inch) or the actual 12 bolt. Most have broken the posi. So if a locker is going to be as strong and much more streetable (especially a soft locker), why would you go spool? Also, is this your daily driver? In other words, can you wait 6 months for the locker to come out? Could you get by with your old 10 bolt for teh time being? Either way, I wouldnt go back to posi unless it is pretty cheap. But back to my original question, would a 12 bolt locker be as strong as a 9 inch locker?[/QUOTE]


I doubt it. Look at pics of a 12 bolt and look at pics of the 9". You can tell just by looking at them what the difference is.

HumpinSS

iTrader: (1)

I'll prolly be going with the Truetrac. Their catalog lists it as having the 45* pressure angle cuts on it. All I have to find one for is a 4.10 and up and I will put the tests to it.....

SMOKIN01TA

iTrader: (10)

only ones that have posi units.
i killed my posi after a few 6000 launches, slaped a spool in it and have been dozens of 1.4 60s with no problem, but they are a screamin, time for a solid crush sleve.

1fastWS6

iTrader: (3)

The 4-series TrueTrac isn't in production yet. The tech told me that it could be 6 months or more. He had no clue. You could get a 3-series and a thick 4.11 or 4.56 gear for that though.

HumpinSS

iTrader: (1)

LOL even though i read that I was still confused by your post...

The P/N you listed at Randys is the same P/n listed in the catalog for the 4 series diff

z-ya

iTrader: (1)

These trutracs are not lockers they are worm gear differentials aka torsens. They do
have an extra pinion in them for increased torque handling though. They should be a nice street differential but I don't know how happy they will be with 6500 clutch dumps
on slicks.

HumpinSS

iTrader: (1)

Just got off the phone with true trac and the 33 spline 45* differentials (truetac) should be ready by months end

mzoomora

iTrader: (36)

If you ever saw a 9" locker, they actually arent that big. They taper off toward one side a lot to make room for the extra bearing the 9" has on the end of the pinion. I dont know the exact weights or dimensions, but I would think the 9" locker is actually lighter than the 12 bolt. The difference in ring gear size between the two is only 1/8". The 9" is just a much more stable housing than the 12 bolt, especially with all the aftermarket pieces available and all the larger bearing upgrades over stock.