Diff

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Author Topic: Diff  (Read 10450 times)

Offline AussiePhil

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Re: Diff
« Reply #25 on: June 10, 2022, 06:02:29 pm »
Jack the rear of the car up ,put on axle stands . Then turn one wheel ,if both turn the same direction it’s a LSD , if the other one turns the other way it’s an open ,if the other wheel doesn’t turn it’s a true track . Sure there are other diff centres but that’s what most will have .

Hey Glen,
I’ve done this before but couldn’t remember what it did!
So I’ve just jacked it up, turned one wheel the other didn’t turn, turned the other just to be sure and got the same result.
That’s a pleasant surprise, I just presumed it was an LSD.

Thanks Glen, knowing this now I won’t need to pull it out for a look, way simpler!

Cheers Phil.
« Last Edit: June 10, 2022, 06:31:50 pm by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: Diff
« Reply #26 on: June 10, 2022, 07:26:54 pm »
Hey Glen,
This now brings up another issue, I’m using Penrite Pro-Gear synthetic oil.

This is the recommendation by Eaton.
A quality, petroleum-mineral based, GL5 rated 80w-90 gear oil should be used.
Synthetic oils are not recommended for Truetrac applications.
While some customers have found that synthetic oils works well in this application, Eaton has not confirmed under test conditions that all synthetic oils are compatible with Detroit Truetrac applications.
Friction modifiers should not be used because they will decrease performance (reduce differential bias).

So I’ll need to change my oil, it’s not an issue. One thing it’s half the price.
Best to be sure!
Cheers Phil.
« Last Edit: June 10, 2022, 07:29:44 pm by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline GLENN 70

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Re: Diff
« Reply #27 on: June 10, 2022, 09:39:23 pm »
Oh boy great  :grin: . If a true track yes a mineral base diff oil ,not LSD oil or synthetic oil as far as I know . The problem is we are not sure what the diff Centre is 100% . I know you did my test but it’s not 100% fool proof  .  Maybe just leave it the way it is and just drive it .

Offline Mylittlepony1966

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Re: Diff
« Reply #28 on: June 11, 2022, 07:52:33 pm »
Thanks, some good oil in this thread. Happy with the tyres , size & pressures. Could be something  in the suspension, it is tired; however, talking to an old school rev head, he has had the same experience  with it being the diff at the time. I'm sure like everything with tolerances, a little here & a little there adds up to a compunding error.  I will have the front end looked as it is loose.
Meanwhile  enjoy those cooler temps.

Offline scollist

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Re: Diff
« Reply #29 on: June 12, 2022, 10:38:32 am »
Kevin,

If you need help you could try SMS777 here on the forum.  He moved his business from Sydney to Townsville a couple of years ago and from a history of posts he knows his stuff - though he is a Mopar guy!

Cheers
Shane


Offline AussiePhil

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Re: Diff
« Reply #30 on: June 12, 2022, 07:08:33 pm »
Hey Glen,
I really want to see for sure exactly lsd / truetrac it is.
So I’m thinking about putting a drain plug in at the same time to make it easier the change the oil in the future.
I was thinking of on centre and a 1/4” bsp tapered inhex brass or zinc coated steel plug. It’s unlikely I’d scrub one in the centre.
What do you think?
Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline Mylittlepony1966

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Re: Diff
« Reply #31 on: June 12, 2022, 08:31:49 pm »
Scollist/Shane
Cheers tracking old mate in TSV thanks.

Offline AussiePhil

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Re: Diff
« Reply #32 on: June 18, 2022, 08:14:38 pm »
Hey all,
I’ve pulled my diff centre out to check exactly what it is.
Glen and I by a simple wheels in the air tests were expecting a geared truetrac?
When I got it out I thought you’re kidding me it’s just an open centre C6AW-4205.
But it doesn’t act like an open centre diff.
After letting it drain the oil off overnight I inspected it further, it’s got a nice new US Gear crown and pinion and a shiny new none genuine diff cover, I believe it may have been overhauled in the US just before it was imported.
Looking on the internet I haven’t come up with much!
It’s not a stock Traction Lok, it hasn’t got the square spring preload plate, but in its place is a round spool that carries the pinion and side gears. It’s not a mini spool!
I’m thinking this round spool may have one spring for clutch pack preload. (UPDATED 19TH June: no that can’t be right because a pin passes through the middle) behind the shiny new diff cover has a clutch pack same as the Traction Lok.
I’ll try and add photos.
Cheers Phil.
« Last Edit: June 19, 2022, 09:04:13 am by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: Diff
« Reply #33 on: June 18, 2022, 08:50:51 pm »
Hey all,
You really don’t get a good idea of the spool pin detail with this photo.
On this end the drive spline has gap in the middle of the spline. That would be the clutch hub and the side gear splines!
Apparently if the diff cover is machined it is a Traction Lok?
Cheers Phil
« Last Edit: June 19, 2022, 09:01:33 am by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: Diff
« Reply #34 on: June 18, 2022, 08:54:59 pm »
Hey all,
This photo shows four bevel gears and the round spool.
Cheers Phil.
« Last Edit: June 19, 2022, 05:11:57 am by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: Diff
« Reply #35 on: June 18, 2022, 09:00:09 pm »
Hey all,
This cross section shows the Ford Traction Lok showing the Square clutch preload assembly.
Where this is mine is round and all three pins are fitted into.
Cheers Phil.
« Last Edit: June 19, 2022, 05:10:00 am by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: Diff
« Reply #36 on: June 29, 2022, 12:01:26 pm »
Hey all,
Update on my diff, I pulled the centre out the other day and found it has a set of clutches and a set of four spider gears but not the usual preloaded of a traction lock diff.
It appears the spider gears through out (Axial) pushing the pinion gear onto the clutch pack locking both axles.
I've searched almost everywhere on the internet and can't find anything like this!
I also emailed YouTuber in America and he hasn't seen anything like it either.
Message me back if you can shine some light on this please!
Cheers Phil.

PS. There are US Gear markings (G in a shield) on the gears, Strange, Currie and Yukon use US Gear.

Cheers Phil.
« Last Edit: June 30, 2022, 06:19:06 pm by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: Diff
« Reply #37 on: July 26, 2022, 06:43:25 am »
Hey all,
After emailing a heap of Differential services I needed to email Currie Enterprises about their axle spacers, I got an answer back about this differential.
It’s classified as a Torque Sensing LSD.
As I presumed it is done for a reason, it’s the same principle as a Torson Gear LSD. (Eaton TrueTrac)
There is less preload on the clutches static and coasting so the clutches last longer. Under power the side gear load the clutches to gain the traction.

Torque sensing LSDs respond to driveshaft torque, so that the more driveshaft input torque present, the harder the clutches, cones or gears are pressed together, and thus the more closely the drive wheels are coupled to each other.

Cheers Phil.
« Last Edit: July 26, 2022, 06:11:58 pm by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!