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Originally Posted by G1947
I can get a VN/P/R rear end from the wreckers for $200 - $250 disc to disc.
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Garry, I'm no expert. Just blessed to have built one of these before.
It's amazing, it's been nearly 10 year since we looked into the options. And back then 2nd hand Torana 9" rears were abundant and Commodore rears were expensive. As you say the Commodore rears are cheap and I bet the Torana 9" rears are getting difficult/more expensive these days.
You have to add in cost of modifications to fit the Commodore rear. Or just the time and materials if you can do it yourself.
I'm not that familiar with Commodore rear ends. But you will definitely want to find an LSD. LSD in a Cobra is essential. Not sure if the V8 rear ends were stronger, but if they were you will definitely want one of them.
So you must not mind not having deep dish wheels on the rear.
I'll grab details of fitting Commodore rear into an old DRB. I know a few people who have done it.
Also connected with rear ends, is decision on suspension. Go with the cheap and easy Torana/HQ Springs & cheap gas shocks, like Monroe's. Upgrade to Koni adjustable shocks. Or go the full hog and fit AVO Adjustable Coil Over Shocks.