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Hi All, I had my 8 3/4 489 Diff overhauled in my 74 Cuda just after the new year, I purchased a new 3.23:1 crown wheel and pinion as well as a master overhaul kit from Summit Racing, they supplied me Yukon products. After the overhaul the car was driven and immediately there was a whirring noise...

Hi All, I would like some assistance on speedo gears, I was finally able to source parts for my 8 3/4 diff and am about to replace the 2.76 ratio for a 3.23 ratio, I was told this will now affect the speedo reading. Can anyone advise me what teeth numbers are required for the speedo gear to...

Hi not sure if this question has been asked previously, does anyone make NEW 2.76 gears for an 83/4 489 Diff. Also if I was to change to 3.55, (because this all I have been able to find from most suppliers) will these fit in my housing, some research I have done has said they won't fit because...

Hi All, I have a matching numbers 1974 Cuda which I have been restoring for the last few years and it is almost complete, the Cuda came into Australia in 1998 and I purchased it from the second owner here in Australia in 2011, it was in a really bad state and required a total resto. It appears...