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Anytime dalero!

I am a fan of Mobil 1 Synthetic https://www.mobil.com/en/lubricants/for-personal-vehicles/our-products/products/mobil-1-syn-gear-lube-ls-75w-140/ It has a nice range and has a good heavy high end...

Easy on the old girl! You are far better off with the correct lube and waiting a few seconds that's for sure.

You have the right fluid in there now. The 1st reverse grinding is probably a few things. I am assuming it had some pretty thick gear oil in it before.

The first and reverse gears are not...

I use Red-Line MT-90 https://www.redlineoil.com/mt-90-75w90-gl-4-gear-oil

It is pricey. It's just one of those things I have used under some extreme circumstances. Good stuff.

No One65r, do not put hypoid oil in your trans and transfer case. Max Gear will work well in the Axles however. Here are two links to get you started. If you want to top it off use the right lubes....