Has anyone used Royal Purple 75-140 in their transmission? I put it in my 08 and it seems like the trans is quieter, or maybe just my imagination. Well it be too thick in the winter? Any thoughts please!

 

I either use Bel Ray, Amsoil or Red Line 75-140 in the tranny.

 

It's not your imagination - you now have the proper oil for the application. 80/90 will work just as well if you can't find 75/140 and any brand is fine especially in a synthetic.

 

I just pulled it out of mine and though I did like it I like the Redline shockproof much better.

 

I've always used Amsoil in all three holes.

 

I've been running it for about 4000 miles in my '08 UC...seems to be just fine. I'll leave it through the winter and expect no issues.

Hope that helps!

 

After at least 250,000 on Harley's, Red Line Heavy Duty Shockproof is the ONLY, and I repeat ONLY Fluid that will go in my TRANS. Great Stuff. And in my humble opinion, CAN NOT BE BEAT! Of course others may have other opinions, but you'll be hard pressed to find anything better. CCRyder

 

hard pressed to find anything better than Red Line Heavy Duty Shockproof, I can't find it at all. Pepboys has Royal Purple that is why I chose it. I believe most syn are the same I am more concerned with the 75/140 instead of 75/90.

 

where can i get some?

 

Put Spectro HD Platinum 6-Speed Oil in my 08UC it really does the trick.