unhappy with 80w-90 gear oil

[Abletobecain]

Mid-winter update: I drove around in some low-to-mid-30s (*F) temperatures in the Tercel over the last few weeks. The Redline MT-90 still feels great with no grinding in any gear and smooth operation despite the cooler temps.

That's great news! I put MT-90 in my DD and not 30 miles later the water pump siezed and ripped my HB in half then a headbolt moved funny on the retorque and sheared off when I was attempting to replace it. It felt great for those 30 miles though!

[AugustusFerdinand]

So what's the community's choice for oil in the rear diff?

[Abletobecain]

I'm running Ravenol 90 gl5. I got it cause it's an actual liter. Good stuff and pretty reasonably priced on Amazon.

[Esaus]

Im using Biltema 75W-90 multi gear oil in both the rear diff and the transmission. Its a GL 4, and GL5 oil thats not aggressive to yellow metals. Costs 99SEK for 1l loosely 10€ so its cheap. My rear diff is making noises when i come off acceleration and when im in 2wd. When in 4WD its quiet. Im guessing its the preload or something. Needs adjusting. Might go to a straight 80W GL5 if i take it apart to adjust and check lash. Had issues with shifting after I had the clutch replaced but it was a too tight clutch cable, after I adjusted the cable it shifts better. The new clutch is "heavier" than the old worn one making shifts harder as i need to ease on the clutch more than before.