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Old 17-07-2017, 10:20 AM
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*rayman* *rayman* is offline
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12 Bolt diff centre options?

Anybody using a mini spool in their classic?

So who's running a mini spool on the street?
Would you use one again?
Any of them better than the others?

Last edited by *rayman*; 17-07-2017 at 07:33 PM..
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  #2  
Old 17-07-2017, 10:39 AM
69JavelinMan 69JavelinMan is offline
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Expect to go to jail of you have an accident and somebody gets hurt. I wouldn't consider running one on any street driven car for legality reasons.

Buy yourself a new truetrac centre and give the diff a birthday.
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Old 17-07-2017, 11:22 AM
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Hmm, might have to reconsider. Didn't realise the mini spool was frowned upon or illegal. Maybe a thread title change is in order, and discuss what centre is best option for street use.

What sort of labour can i expect to pay to get a diff centre and ring and pinion gears installed into a 12 bolt?
Can this be done while the diff is still in the car?
What to buy: Eaton Posi, or TrueTrac?

Last edited by *rayman*; 17-07-2017 at 12:29 PM..
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  #4  
Old 17-07-2017, 12:47 PM
qik66 qik66 is offline
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Ray a spool on the street not a good idea, would make the car a pig to drive and scrub tyres badly. imagine every time you try and turn the wheels the car just wants to go straight! Mate had one fitted to his Torana years ago ended up rolling it into the table drain at the end of the Dalrymple service road when it wouldn't turn, luck he didn't kill himself. as for your other questions, yes it can be changed in the car, hardest part will be finding someone in Townsville to do it!!
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Old 17-07-2017, 12:53 PM
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Quote:
Originally Posted by qik66
yes it can be changed in the car, hardest part will be finding someone in Townsville to do it!!
I know this will be a challenge, When you back in town? Feel like putting a carrier and gears in for me?
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Old 17-07-2017, 01:00 PM
qik66 qik66 is offline
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Quote:
Originally Posted by *rayman* View Post
I know this will be a challenge, When you back in town? Feel like putting a carrier and gears in for me?
Not a problem , home now but off again on Wednesday, back again on the 28th . In all reality will have no free time till late October to do any work but after then I am sure we can work something out
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Old 17-07-2017, 07:17 PM
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BlackoutSteve BlackoutSteve is offline
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Besides, Mini Spools are for dirt track. Full Spools are bitumen.

Get a TrueTrac and be done with it.
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Old 17-07-2017, 07:29 PM
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Truetrac looks like the go.

The americans all like the posi units by the looks of things.

Picking a ratio for my combo is probably my next issue.

Combo is/will be a 454-TH400-12 bolt. 18" wheels, running a 285/40 for a bit more sidewall in the rear, but probably going down to a 265/40 so i can lower it more and keep it from scrubbing the guards. Will have a comp XR292 cam, and probably a 3000 or 3500 stall.
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Old 17-07-2017, 07:49 PM
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The term "Posi" I think is just what most people call any Limited Slip differential.
"Posi" being the GM trade name, just like Chrysler's "SureGrip" or Ford's "Traction LOK", are all clutch types.
"LSD" is also a term usually reserved for clutch types, but the gear types like the TrueTrac and WaveTrak etc, are still also LSDs because they simply limit slip.
A Detroit Locker is a bit different. When it transfers torque through both axles, it can do so only while rotating them at the same speed. ..or transfers torque though just one.
All of the other LSDs can send torque through both axles while also rotating them at different speeds.
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Old 17-07-2017, 07:53 PM
Geoff 4 Geoff 4 is offline
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Another option is the PowerTraxNoSlip. It is similar to the TrueTrac but much stronger, pretty much unbreakable. Available for all the popular diffs.
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Old 17-07-2017, 07:55 PM
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Yeah, I have a WaveTrak in mine. They (Moser) recommended it as they said the TrueTrac is "only" good for around 600hp.. WaveTrak 800-900.

I was originally trying to put a Detroit Locker in it but they said that 12Bolts can't really accommodate machining for the larger bearings with the 40 spline axles.
I like Lockers.
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Last edited by BlackoutSteve; 17-07-2017 at 07:57 PM..
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Old 18-07-2017, 06:54 AM
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I ran a Detroit locker in the Camaro bud. It handled my horsepower fine(enough to break 2 sets of axles and 2 boxes ��). It behaved well on the street as well.
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Old 18-07-2017, 03:42 PM
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I also have a detroit locker and I love it
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Old 18-07-2017, 03:46 PM
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Detroit Locker in my Strange dana 60, just lots of fun
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Old 18-07-2017, 03:48 PM
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so a detroit locker is acceptable/legal on the street, but not a mini spool?

Quote:
Originally Posted by blackoutsteve
The term "Posi" I think is just what most people call any Limited Slip differential.
I believe the yanks are referring to the Eaton posi style centre when they say they have a posi unit. (or the yukon copy) I could be wrong though.

Last edited by *rayman*; 18-07-2017 at 03:51 PM..
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