Passon Performance 5-speed

Has anyone had gear clashing when shifting gears? What kind of gear lube are you using?

I've had some clashing when shifting into 3rd gear on my A855. I was initially using a 75w90 GL5 gear oil. Then I got a note from Jamie saying to use 75w140 GL5 and after changing I got some clashing going into 2nd and 3rd. ie seemed to be getting worse. (I've got about 5000 miles on the tranny)
After some e-mails back and forth with Passon, Jamie sent me a bottle of Lube Gard ATF Friction Modifier (p/n 61910) to add to the gear lube. I was surprised it was for ATF and after some more e-mails, I was told that they have used this with success to improve gear synchronization.
I also questioned why they specified a 75w140 GL5 lube instead of a GL4 manual transmission lube. (A GL5 lube is usually specified for differentials and has a totally different friction modifier package than a GL4 MT lube.) I was told that the GL5 75w140 performed better behind very high HP engines (ie turbo etc). ie it needed a higher viscosity oil to maintain an oil film between the gears.
My engine is a basically stock 6.1 SRT8 Hemi so I'm going to use a GL4 Manual Transmission lube ( probably Amsoil MTG 75w90: Manual Transmission & Transaxle Gear Lube 75W-90 )
I was also told they have changed the synchronizer design a bit as the tranny evolved (I was # 4- a very early one) (Interesting to note that the A855 has carbon fiber blocker rings.)
I was also sent this interesting article of MT gear lube. http://www.widman.biz/uploads/Transaxle_oil.pdf which confirmed my engineering assessment that I was using the wrong lube.
Now I have to wait until spring!!!!
Jim