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I don't get hung up on the high priced, big name fluids. The fact is, many of the brands come from the same place. I buy many NAPA branded fluids. I know their engine oils are Valvoline in a NAPA container for less price than the same Valvoline product. If you think about it, I know several...

Stumps is right. Your trans oil can be too slick. I've heard of shift problems when people switched to synthetics.

Sometimes search is not your friend. :) All joking aside, I've already stated my feelings on this issue and do not wish to re-hash the debate. Best thing to do is read all the opinions and decide for yourself what to use.

I honestly don't think there will be a final say. It is akin to the Ford vs Chevy debate. The best thing I can tell you is to do your research and use whatever you feel comfortable with. All I could do is tell you what I use but there are some that will say I'm dead wrong.

Paul, I just did and quoted it here for you to see. I stand by what I said, " Nowhere in Stumps post did he say GL-1 flowed better than GL-5". GL-1 is not even mentioned in his whole post.

Nowhere is Stumps post did he say GL-1 flowed better than GL-5. I don't think he even mentioned GL-1 in his whole post. :???:

Paul, I said I wasn't going to get into the debate but you're trying to drag me in. As I said, I'm comfortable running my cow piss. I know you think I'm dead wrong and that's ok. I find it hard to believe that a reputable oil company would put something akin to cow piss or BK fry oil in thier...

Thanks, I'll have some. :D All I've found out is this- Paul says use GL-5. Some others say use GL-1 (which Paul says dosen't exist). Others say run SAE 50 or similar weight motor oil. I honestly don't think we're ever going to come to a consensus on this subject. I guess read this thread...

I'm still going to stick with GL-1 as long as I can still get it. I don't know if it's got cow pee or TN river mud in it but my trans seems to like it.

What's wrong with GL-1? It's worked in these trucks for 50+ years without problems. 1) It's cheaper than GL-5 2) It's what the manual calls for 3) I'm not aware of a problem with running GL-1 in these trans.