Gear Lube vs Transmission lube
You need to really read the labels
many GEAR lubes (even synthetic) are not suitable for synchromesh trannies or transaxles as the additives eat up the brass synchros 
 
> Date: Tue, 27 Aug 2013 11:20:39 -0700
> From: stuartmacm@GMAIL.COM
> Subject: Re: Transmission/gear lube
> To: vanagon@GERRY.VANAGON.COM
> 
> Heavy loads are harder on the clutch than the transmission.  I've been a
> longtime fan of Red Line MT-90 because of improved shifting, but any good
> full synthetic should be fine.
> 
> Stuart
> 
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
> ralph meyermann
> Sent: Tuesday, August 27, 2013 10:49 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Transmission/gear lube
> 
> Any suggestions on heavier transaxle lube when pulling a trailer/loaded
> heavy? I just want to know if its a good or bad idea for my 4 speed.
> Velma 82 1.9L AAZ  td westy