The diff centre in the HQ will be most likely be a 3.36 or 3.55 ratio coarse spline non-LSD, the same as what you will find in the EH. The HQ housing & axles will be way too long for the EH. The mount brackets are also totally different.

A 3.08 centre will more likely be found in a 6-cyl Torana. The later centre will fit the EH as long as it is also coarse spline. If you want to fit a fine spline centre to an EH, you will need custom axles, but is it worth the effort ?

Fine-spline axles & centres did not become commonplace until HX/LX.

Dr Terry

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When calculating a car restoration budget, be as accurate as you can & then double the final figure. It will be closer to the truth.

Thanks for the info guys, I'll opt out of getting a fine spline, I was only thinking of doing it because of all the towing I do with the EH Prem Wagon I use for work as a Handyman/Gardener. I've upgraded the brakes and have just had the clutch slave cylinder bracket for the Celica Steel case 5 speed I have in it explode into bits due to the stress of pushing a one tonner pressure plate and the fact, as I've just found out, that the push rod for the clutch fork is operating on a spazzy angle. Must have the wrong clutch fork and man is it hard to operate the clutch, in heavy traffic my toes on my left foot genuinely go numb and tingly from using it..