Tuesday, Mar 26, 2019 at 21:15
The Truetrac differential is a limited slip diff, patented and produced by Eaton.
Ford manufacture it for their vehicles under licence to Eaton.
The Truetrac diff is a clever piece of work that utilises spiral carrier gears to prevent excessive wheelspin on the wheel that has lost traction - and while it's doing that, it's delivering more torque to the wheel with traction.
Older style limited slip diffs utilised clutch packs each side of the carrier to prevent wheelspin, but the Truetrac is an improvement on the clutch-style type of limited slip diff.
Detroit Truetrac LS differential
2WD utes suffer from two major drawbacks in rough conditions -
1. Excessive weight on the front end, which means much less weight on the drive axle, and a corresponding willingness to lose traction quickly.
2. A lack of ground clearance which ensures the ute bellies out quickly in very uneven ground - or it suffers underbody damage due to rocks, sticks, stumps and other impediments buried in the track.
In the case of (1), you can improve the weight spread effectively by placing some serious weight in
the tub or tray, right over the back axle, or even slightly behind it.
You will need at least 250kg, preferably about 350kg.
This will then balance out the weight spread, and give the rear wheels some adequate gripping ability.
In the case of (2), this is the reason the RTV Falcon was produced. It has vastly improved ground clearance, and underbody protection on the vulnerable drivetrain and
suspension areas.
The oversize tyres are a definite advantage, and even more so if they are not low profile tyres. You need at least 75 series profile tyres and more preferably 85 series profile.
A 2WD ute with a decent amount of ground clearance, a limited slip diff, oversize tyres, and a decent amount of weight over the rear wheels, will go a long way in rough conditions.
Very steep terrain is where it will not be able to match a 4WD.
Cheers, Ron.
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