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Thank you again Dave. The read end had some clanking shifting from drive to reverse. The old fluid looked like complete sludge Hope the sound will be reduced with the new fluid change. Thank you again for your help. Best Regards', Nick.

Thank you Dave. I appreciate your help. Yes both wheels turn in the same direction. If I use the Lucas product will I still need an additive? Also, before listing this post I used Valvoline HP 80-90. It doesn't say if it is Synthetic but is does say that it is API GL 4-5 suitable for...

I'm changing the Differential fluid on my 1977 NYB. It is equipped with a 440 and has a 12 bolt cover. I wondering if it needs a friction additive. Also, I do not see any spider gears inside. Instead there are some springs. What type of differential did they use on the NYB?