Diffs... 80s Vs GQ

[mico]

cool, thanks mate it's nice to learn new things, I was gunna run a D/C with an offset diff but now I won't cheers

[justinshere]

Wonderful... thanks for all ur help everyone!

[bubs]

Do what i had

80 Series Front
GQ Rear

There is 5mm WMS difference

[slosh]

even then, I can't see how it makes any difference the angle of the uni's doesn't really matter as long as both ends are the same, ie. the pinion and the T/case output are parrallel

yes that is entirely correct... so long as it doesnt have a double cardon joint at only the tcase end.

Both ends of a driveshaft have to opposed each other in order to cancel out vibrations (you obviously already know all this)... a double cardon (at tcase) with a sinlge uni (at diff) with offset diff to tcase input/output do not accomplish this.
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for justinshere:
Antoher way to look at it is as the shaft is rotating each individual uni is actually decelerating and accelerating twice per revolution.
So with a stadard uni drive shaft (on U joint at each end), one U joint will be decelerating at the same time and at very near the same rate that the first "U" joint is accelerating (assuming all inputs/outputs are parralel), resulting in a smooth power flow through to your pinion (which will cause no vibration). (taken straight from tom woods)

so dude, if i was you id go the 80series full floating rear and run single (but big) U joints at each end of the drive shaft and not worry about the diff offset.
Just make sure the shaft is balanced correctly and that your diff input is parralel with your tcase out put


Luv
Grimace

This is the opposite of what I was told by drivshaft services. You will need a D/C joint at t/case end and the pinion MUST be parallel with the t/case flange to cancel the vibes.
This is exactly what my truck has (Hilux with 80 diffs) and it drives vibe free.
The disadvantage with this is the pinion cannot be rotated up to compensate for lift, so if justinshare is runnug dual cases (short will be short) there will probably be excessive angle on the uni at the pinion.
As bubs said 80 front/ GQ rear is the best combo.
With the GQ rear you will need custom rear calipers or trans handbrake as well.
In other threads the hardcore guys have commented that GQ cv's and even GU for that matter will not be as tough as even a hilux cv with longfields, and the 80's would be stronger still.

[-Richo-]

05 hilux rear matches the 80 track as well, youll just have to use the older backing plates and brakes as the new lux's have a different set up.