Diff Education Needed.

[Souljah]

Google WaveTrac. The yanks seem to be getting good results out of them. Same principal as a truetrac however they will power both wheels under any throttle condition even if one is in the air unlike the truetrac however they drive like a total stocker.

[Tre-Cool]

i have a kaaz in my vy ute..

it's shit.

[Drizt]

i have a kaaz in my vy ute..

it's shit.

In what way exactly?

[IJ.]

Google WaveTrac. The yanks seem to be getting good results out of them. Same principal as a truetrac however they will power both wheels under any throttle condition even if one is in the air unlike the truetrac however they drive like a total stocker.

The Offroad version of the TrueTrac has a preload Bellville Spring and Plate arrangement to do the same thing, I used one in one of my previous cars when I built an IRS 9" for it, As they're set up for 33"+ Mud tyres it was hideous with low profile street rubber winding up and then letting loose with a SNAP when you tried to do tight turns, I ended up have custom springs made and it was really nice, Truetrac/Torsen are Torque biasing Diffs and if you have 100% slip at both wheels xx% of nothing is well nothing so no drive at all! (in case anyone was wondering why)

A nice "trick" I've used if I get stuck is to pull a couple of clicks of handbrake on and it'll usually motor out no probs with a non preload TT.

[HOLDAN]

Google WaveTrac. The yanks seem to be getting good results out of them. Same principal as a truetrac however they will power both wheels under any throttle condition even if one is in the air unlike the truetrac however they drive like a total stocker.

I have a Wavetrac and 3.5 gears in a 9" in my VESS A6 - works very well.

[07L98SS]

The diff specialist I asked about what to do with standard shit diff me the options: In price and toughness
standard diff(crap)< generic trutrac copy (as good as name brand) = $800 < eaton trutrac = $1300+ < wavetrac= $2000+
This was for the parts only and another $200 or so to fit them to a housing I supply re using the gears.
He recommended for regular street use a generic trutrac would be ok. For hitting the strip or competition use get the wavetrac.
Holdan what did you pay for that setup?.

[Jag530G]

The Offroad version of the TrueTrac has a preload Bellville Spring and Plate arrangement to do the same thing, I used one in one of my previous cars when I built an IRS 9" for it, As they're set up for 33"+ Mud tyres it was hideous with low profile street rubber winding up and then letting loose with a SNAP when you tried to do tight turns

Interesting what you say about the nature of Belleville springs/plates. My Jag 420G has a Thornton Powr Lok LSD which uses Belleville springs and plates. When I pulled the diff apart I was expecting an LSD set up similar to the Holden LSDs with the springs and clutch plates but not so.

Cheers, Matthew

[IJ.]

The diff specialist I asked about what to do with standard shit diff me the options: In price and toughness
standard diff(crap)< generic trutrac copy (as good as name brand) = $800 < eaton trutrac = $1300+ < wavetrac= $2000+
This was for the parts only and another $200 or so to fit them to a housing I supply re using the gears.
He recommended for regular street use a generic trutrac would be ok. For hitting the strip or competition use get the wavetrac.
Holdan what did you pay for that setup?.

Prices look to be one step out, $800 sounds close to an Eaton TrueTrac, $1300 is close for a Harrop TrueTrac.

Interesting what you say about the nature of Belleville springs/plates. My Jag 420G has a Thornton Powr Lok LSD which uses Belleville springs and plates. When I pulled the diff apart I was expecting an LSD set up similar to the Holden LSDs with the springs and clutch plates but not so.

Cheers, Matthew

Is the Thornton a Cone Style LSD Matt?

[IJ.]

^^ Did some reading and understand it's operation now

[seldo]

Interesting what you say about the nature of Belleville springs/plates. My Jag 420G has a Thornton Powr Lok LSD which uses Belleville springs and plates. When I pulled the diff apart I was expecting an LSD set up similar to the Holden LSDs with the springs and clutch plates but not so.

Cheers, Matthew

I used these effectively 45 years ago! They work very simply by the torque forcing the sun-gear axle up a ramp in the diff-centre and thus clamping the dished clutch-plates tighter. We used to be able to buy sets of clutch plates in varying thicknesses thus allowing you set up whatever pre-load you wanted, and pre-determining the amount of slip to the point that I used to use them almost completely locked.

[QIKMIK]

Great vids and great info from all. Seldo, I didn't know you needed a diff to connect two horses

Mick

[Jag530G]

I used these effectively 45 years ago! They work very simply by the torque forcing the sun-gear axle up a ramp in the diff-centre and thus clamping the dished clutch-plates tighter. We used to be able to buy sets of clutch plates in varying thicknesses thus allowing you set up whatever pre-load you wanted, and pre-determining the amount of slip to the point that I used to use them almost completely locked.

What were you racing? E Types or MK 2s?

One thing I am curious about is that there are 10 bolts that hold the Crown gear on to the diff centre and in the UK they seem to refer to these Powr Loks as Salisbury units, I wonder if the Powr Lok centre could have been fitted to a GM 10 bolt Salisbury axle we have in V8 HK - HZ Holdens?

The Americans refer to these diffs as Dana units, Powr Loks were fitted to Jeeps over the years. @IJ, The Powr Lok might be where the idea of fitting Belleville springs/plates to a Trutrac to make the off road version came from, the Jeep guys were very familiar with Powr Loks.

Cheers, Matthew

[HOLDAN]

The diff specialist I asked about what to do with standard shit diff me the options: In price and toughness
standard diff(crap)< generic trutrac copy (as good as name brand) = $800 < eaton trutrac = $1300+ < wavetrac= $2000+
This was for the parts only and another $200 or so to fit them to a housing I supply re using the gears.
He recommended for regular street use a generic trutrac would be ok. For hitting the strip or competition use get the wavetrac.
Holdan what did you pay for that setup?.

I had a full rear end job done - included axles, tail shaft etc. Good for a 1,000 plus horsepower. Cost a shite load. I'll dig up the invoice and let you know what the diff-related costs were

[seldo]

Great vids and great info from all. Seldo, I didn't know you needed a diff to connect two horses

Mick

Of course you do Mick - otherwise you can't tell them apart and don't know what's the diff...

[seldo]

The Americans refer to these diffs as Dana units, Powr Loks were fitted to Jeeps over the years. @IJ, The Powr Lok might be where the idea of fitting Belleville springs/plates to a Trutrac to make the off road version came from, the Jeep guys were very familiar with Powr Loks.

Cheers, Matthew

Dana were/are the manufacturer, and PowrLok was the brand-name given to the unit which was supplied to many manufacturers as an OE fitment - Jag, Volvo, Willys, GM etc. Dana are/were very big in the US as a specialist drive-line components manufacturer and also made the unit fitted to the Holden CrossTrak which is also the same unit supplied to BMW for their X5. @IJ - there might be some other components there that may be of use to you...