Just get a Salisbury out of a V8 HQ-WB. Is yours a passenger or commercial? Youll need a tailshaft too to shorten as the Salisbury will have a bigger uni than your banjo. With that engine and box a 3.36 or 3.55 would be the go, however 3.08 would be OK also as this is what the VT should have.

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If we all had the same (good) taste, who would buy all the Fords?

OK, any V8 HQ-WB sedan, wagon, coupe or Statesman diff will bolt straight in. The only one you dont want is a diff from a HQ 350 coupe, sedan or Statesman as it has a bigger uni than you need on the diff, although that can be worked around if you get the tailshaft with it. Grab the tailshaft from the same car as the diff except if its an original 308 auto HJ - may 1979 HZ as these had a TH400 and not what you want. You have to shorten the tailshaft for the 4L60E. The only catch is most of these will be 2.60, 2.78 or 3.08:1 ratio. If you are really keen get a WB Statesman diff which will have disc brakes on it, and its a relatively simple job to make that fit your HQ. Just grab the handbrake cables with it up as far as the U-bracket. If you get a drum brake one you can use the drums and backing plates you have now or use the ones on the diff. Just remember that if you get a disc brake HZ-WB diff you cant put drums on it as the axles are too short for drums.
The other thing youll need is a gearbox crossmember from a May 1979 to about late 1982 Statesman that had a TH350 in it. This will just about work with the 4L60E, possibly just a few holes to make it work. The trimatic crossmember will need serious surgery to work,but if you can weld and fabricate not too hard. Normally a TH400 HQ-HZ speedo cable is what you need but I think a VT 4L60E has no speedo drive on it so youll have to get the HQ speedo modified to take an electronic signal.
Ive also seen HQ-HZ sedans modified to take a VN-VS fuel tank quite easily and the fuel guage made to work with the Commodore sender unit. This way you just get a tank with internal pump and return line fitted so its an easy conversion. If you want this info ill see if I can find the link to the site that shows how to do it.

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If we all had the same (good) taste, who would buy all the Fords?

I dont think your diff is going to be your biggest hurdle here.However thats the question,so if you get a disc brake rear end from a statesman get the brake booster and master cylinder aswell ,cause I think they have different pressures from front to the back brakes.Also get cables for the handbrake,I dont know that they are different but itll save you from looking later. I also think a salisbury would do fine,they are quite strong.
THat would be the rear end sorted out I think..jim

Jim in Adelaide...Hindsight is bad vision!

Hi All,I would just replace the whole booster ,one reason I would replace it is because of the design but another reason is,in my opinion its easier and,on the statemans they have a clearish master cyl which I quite like.(easy to see the levels)....lol.It is good to know you dont have too,I didnt know that the pressure is the same,ya live - ya learn.

Jim in Adelaide...Hindsight is bad vision!

WB statesmans the one i like.

Jim in Adelaide...Hindsight is bad vision!