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This gives me trust issues.. lol That is just really sh*** of someone to do.

It really is strange how much they can vary.. I suppose that's part of why these oil threads always blow up haha. I can't blame you for trying the good stuff off that bat, it would be nice to have all the characteristics of the synthetic oil (low pour point is what tempts me). AFAIK my trans...

I know what you're talking about, it's synthetic. I've looked at it, and have heavily contemplated trying it. It looks like good fluid but for the price I have a hard time commiting to it, for fear that my trans ends up not liking it.

Damn that sucks... Is that their 50 wt synthetic? Seems strange that the heavier oil would make it shift easier.. either way quite unfortunate.

As another update here.. I put about 100 miles or so on the 40 wt ND oil, and maybe it was just chance but it immediately started leaking from the rear main seal (well not quite immediately, I think it started once it was warmed up), at least as far as I can tell that's where it was coming from...

Yeah I'm not so concerned about draining and replacing, but I don't have anything to filter to burn it. So then I'm just stuck with more waste oil sitting around lol. Small problem though. I'll give it a shot and report back.

Haha I'm hearing ya. My main concern is the pour point of the sae 40, but i suppose if its double digit negative i can just slap some pan heaters on the trans and tcase.

I'm a little worried how that would work when its below zero haha. Based off the the chart posted on page 1 75 or 80w - 90 is probably my best bet for all around usefulness. Maybe I'll see if bomgaars will take the 40 sae back without a receipt.

I guess that's a fair point.. I didn't keep the receipt so i guess i may as well try it in the trans. Tcase i might just go straight to 75/90.

My trans has 80/90 in it now, I'm leaning towards sticking with that or going 75/90 for better winter shifting. It shifts fine now, aside from being sluggish in the cold. I thought the viscosity was lower on the SAE 40 when i bought it, but after finding this thread and researching more mfg...

Well i bought SAE 40 ND last week planning to change my transmission and tcase fluid to it, but after finding this thread I'm not so sure. Anyone else have more input on the topic?