check mystik web site,,farm&fleet,(wisconsin) has 75w-90 full synthetic bottles jt-7 for $8.29,,gl 4&5,,maybe a retailer in your area has it ,made by citgo,,looks like some good gear type oil and decent specs.have used it in past with no problems.
I just finished changing the gear oil in my Ram 2500 and our Expedition with Mystik 75w-90. I was happy with the specs and it is made to work with limited slip differentials. So far the limited slip in my Ram seems happy with it.
Mystik SX - 7 Synthetic Blend Gear Lubricant - 663745002017 | Blain's Farm & Fleet
Get your Mystik SX - 7 Synthetic Blend Gear Lubricant - 663745002017 at Blain's Farm & Fleet. Buy online, choose delivery or in-store pickup. Great prices on Automotive Greases & Gear Oils.
www.farmandfleet.com