Eaton Posi toast, Replacement options?

[B4C]

So I blew put my eaton posi in my 12 bolt, Im pretty sure its the clutches and not the spiders in it. Now I plan on spraying it with a 100 shot, I can rebuild the posi with new clutches and springs, but what are the chances Im going to kill it again? I race the car alot and Im now on a slick. I was thinking of putting in a spool because they are cheap, but Im pretty sure I would hate it on the street. Mt next options are a Detroit True Track, or Detroit Locker. Any suggestions? Replace the eaton or rebuild it?

[LTb1ow]

Wavetrac

[sweetbmxrider]

The spool will definitely be quicker at the track but like you said, be tougher on the street. I have a true trac now and I'm not a huge fan of it. It hasn't let me down yet but I feel it slip sometimes. I've only gone mid 1.6s on it so I'm not hitting it too hard. I was looking at replacing it with a detroit locker when it does go.

[B4C]

Wavetrac

That requires 35 spline axles and also costs $1000 BY ITSELF. I'm not looking to replace the axles at the moment.

[sweetbmxrider]

What spline are you running now? Have you looked to see if they are starting to twist?

[B4C]

The spool will definitely be quicker at the track but like you said, be tougher on the street. I have a true trac now and I'm not a huge fan of it. It hasn't let me down yet but I feel it slip sometimes. I've only gone mid 1.6s on it so I'm not hitting it too hard. I was looking at replacing it with a detroit locker when it does go.

Im leaning towards the locker, I would just hate to spend the money to rebuild the eaton only to blow it up in the burnout box first run out.

[B4C]

What spline are you running now? Have you looked to see if they are starting to twist?

30 spline, had them out about 3 months ago to replace the drivers side shaft because it was bent, there was some marking on the splines on the passenger side didnt look twisted.

[BonzoHansen]

no spool

[deadtrend1]

No to spool also. I got a carrier im looking to get rid of ... :)

[B4C]

No to spool also. I got a carrier im looking to get rid of ... :)

You have a PM

[B4C]

If I do rebuild can I throw 400 or 800 lbs springs and the all steel shim packs in there and be ok?

[Sprayed 99]

I had a locker for years and it took some getting used to......but i really liked it. I say just man up n put a spool in it. Several of us run it on the street and its really not bad. I've driven 700 miles since i switched to a spool in my fab 9. I daily drove it to break the motor in (hammonton to cherry hill) for a week and barely noticed it. Its less expensive not to mention lighter.

Ask barney mobile about how his detroit locker feels. He s had one in his ss for years......daily drives it.....and ran 9.7 @ 141 without hurting the locker. Can't argue with results like his

[WildBillyT]

FWIW I've heard some bad **** about the TruTrac as of late. Like internal failures on low mileage units.

I'd say either locker or posi, depending on how much you really plan on hitting the strip.

If you go posi with the red springs be aware that Eaton has some special notes about which clutches you should run. I think only the steel ones make the grade. Either way, check with a rear end guy.

[B4C]

I was gonna call toms differentials nd see what he recommends from what ive been reading hes the giy to talk to about eatons

[Lt1_8U]

I had a spool in my 96 trans am. With 315s it sucked on the street but with a less narrow tire it wasn't bad at all. You just have to drive as if your pulling a trailer around corners haha

[BonzoHansen]

I had a spool in my 96 trans am. With 315s it sucked on the street but with a less narrow tire it wasn't bad at all. You just have to drive as if your pulling a trailer around corners haha

until the overstressed wheel studs snap.

[LTb1ow]

until the overstressed wheel studs snap.

Have you experienced this yourself?

[wretched73]

How much do you actually drive your car on the street?

until the overstressed wheel studs snap.

I really want to assume his studs are upgraded to a higher strength stud because he has a 12 bolt.

[B4C]

How much do you actually drive your car on the street?



I really want to assume his studs are upgraded to a higher strength stud because he has a 12 bolt.

Probably around 5k or more a year. Yes I had arp studs pressed in when I replaced the axle bearings in the fall.

[BonzoHansen]

Have you experienced this yourself?

No, I’ve always listened to the professionals that know more than I do that say spools are not for the street and can cause broken axles and studs. I don’t need to have it happen to me personally to know it’s wrong. But I have seen the damage on other people’s cars.

[B4C]

Looks like Im buying another eaton, Thanks, Tim.

[Sprayed 99]

And after you break another you'll put a locker or spool in it like we did...............

[stealth355tpi]

Spool on the street here, just have to know what you can and can't do. I've got a Detroit locker with less then 1000miles on it but its for 33 spline.

[B4C]

And after you break another you'll put a locker or spool in it like we did...............

Rebuildng and saving for an s60

[Sprayed 99]

Rebuildng and saving for an s60

Another bad idea

[B4C]

Dont have the money for the s60 right now and dont feel like throwing extra money at something im not going to keep. The eaton did hold up to 30k miles and over 50 track passes when I had it and I bought it used.

[Sprayed 99]

But how many of those track passes did u actually 60' really hard? That is what will kill the eaton. Lanchin hard on sticky tires will kill it real fast. You could just upgrade your axles and throw in a locker or spool and be done. 12 bolts are pretty strong when done up right. And s60's weigh so friggin much.....you could pick up a used 9" cheaper and its def lighter.

Just my .02........i speak from experiance.....not opinion

[Featherburner]

And s60's weigh so friggin much.....you could pick up a used 9" cheaper and its def lighter.


And weaker, and rob more HP...

[Sprayed 99]

And weaker, and rob more HP...

The s60 or 9"?

[ShortFuse]

Man up get a spool if u worried bout how it will handle u should t even be behind the wheel of an fbody

[B4C]

But how many of those track passes did u actually 60' really hard? That is what will kill the eaton. Lanchin hard on sticky tires will kill it real fast. You could just upgrade your axles and throw in a locker or spool and be done. 12 bolts are pretty strong when done up right. And s60's weigh so friggin much.....you could pick up a used 9" cheaper and its def lighter.

Just my .02........i speak from experiance.....not opinion

Im not going to be racing on it, dont want it to start whining again after a few launches. For the price of a used 9in I can get a new s60....Ill be looking at both when I go to buy tho.

[ShortFuse]

Ten bolt an a spool you'll be good bud ��

[B4C]

Yeah ill do that, anyone want to trade a 12 bolt for a spooled 10 bolt?

[Featherburner]

The s60 or 9"? 9".

[BonzoHansen]

if ya got a 9" can't you have a few center sections so you can run a spool at the track and then a real dif for the street miles where you have logged over 30,000 miles? I always thought that flexibility was the cool factor with a 9"

[ShortFuse]

9".

So your really sayin a 9 inch is weaker then an s60

[Sprayed 99]

9".

Have you ever seen back to back dyno comparisons between the rears in the same car? The difference is small. And how is strength an issue with properly set up 9" in an 11 sec car? The 9" in my car is good to over 1500 hp.......how is that not strong?

[k_garretson23]

the s60's ring gear is 3/4" bigger than a 9"....please explain to me how a 9" is stronger? The s60 weighs all of 20lbs more than a 9". That difference is next to miniscule. If youre that worried about 20 pound go on a diet.

[ShortFuse]

the s60's ring gear is 3/4" bigger than a 9"....please explain to me how a 9" is stronger? The s60 weighs all of 20lbs more than a 9". That difference is next to miniscule. If youre that worried about 20 pound go on a diet.

When u start goin fast that 20 lbs will make a big difference and a fabricated rear such as the fab 9 or m9 is stronger then the s60 with less drivetrain loss

[WildBillyT]

the s60's ring gear is 3/4" bigger than a 9"....please explain to me how a 9" is stronger? The s60 weighs all of 20lbs more than a 9". That difference is next to miniscule. If youre that worried about 20 pound go on a diet.

3/4" bigger in diameter but the toe to heel thickness of the gear is smaller. Dana loses in that case.

[Sprayed 99]

Fab 9" Way more than 20lb lighter........and there are 6 sec cars sportin 9".........plenty strong enough for 11 sec slug

[LTb1ow]

When u start goin fast that 20 lbs will make a big difference and a fabricated rear such as the fab 9 or m9 is stronger then the s60 with less drivetrain loss

S60 also only has gear sets down to a 3.55 area

[Sprayed 99]

3/4" bigger in diameter but the toe to heel thickness of the gear is smaller. Dana loses in that case.

This8-)

[Lt1_8U]

Spool on the street here, just have to know what you can and can't do. I've got a Detroit locker with less then 1000miles on it but its for 33 spline.

This, you can't go making tight corners. I upgraded my studs to arp and never had a problem. I also never broke a rear... Your not trying to make it handle, spool it and be done

[BonzoHansen]

I suspect the spool supporters are not putting 5,000+ miles a year on the car. The more you drive it the more of a chance you are taking. Fine for a race car, asking for trouble with every additional street mile. ARP studs do not remove all risk.

[LTb1ow]

I suspect the spool supporters are not putting 5,000+ miles a year on the car. The more you drive it the more of a chance you are taking. Fine for a race car, asking for trouble with every additional street mile. ARP studs do not remove all risk.

Can you show any documented proof or examples of the idea you are proposing about spools and street use?

[Lt1_8U]

My trans am got driven every day on the street for over a year

[BonzoHansen]

Can you show any documented proof or examples of the idea you are proposing about spools and street use?

No, I’ve always listened to the professionals that know more than I do that say spools are not for the street and can cause broken axles and studs. I don’t need to have it happen to me personally to know it’s wrong. But I have seen the damage on other people’s cars.

I can't add to my last answer (edit, yes I can, it can cause tire wear issues too). People are allowed to do as they please.

This is one of the topics that the "for" people will defend to the hilt and the "against" people will stay in their corner and no amount of added information changes anyone's mind. It's one of those "if I didn't see it happen it's BS". Ok. To each their own.

[Sprayed 99]

Alot of bad information and fail in this thread............hope the OP can sort out the bs and make a logical decision.............

[LTb1ow]

I can't add to my last answer (edit, yes I can, it can cause tire wear issues too). People are allowed to do as they please.

This is one of the topics that the "for" people will defend to the hilt and the "against" people will stay in their corner and no amount of added information changes anyone's mind. It's one of those "if I didn't see it happen it's BS". Ok. To each their own.

I am merely curious about where the internet fallacy comes from. It seems there is always someone who says it will cause the end of the world and someone who says they daily it 10k miles a year with 5 parallel parking jobs a day.

So, a example of why it is so bad would be nice here.

[Mike]

Alot of bad information and fail in this thread............hope the OP can sort out the bs and make a logical decision.............

He made a decision a while ago....people are just arguing

[Slow-V6]

So how many of the people on here that run a spool love it and how many hate it and wish they would have went another direction?

[Mike]

Make a new thread if you want this one has run its course