If you're doing the differentials, can I recommend a lubricant. At your mileage, I would consider Amsoil Severe Gear 75W-110.

OEM spec is 75W90. I used Severe Gear 75W90 when I did my swap. But at the upper mileage, I would definitely consider the 75w110.

FYI - Tcase calls for Dex III if I recall.