Chad..It's gotta be a 3rd gear syncro thats going bad...at times, the
cold thicker gear oil will help act as a cushion and help a worn syncro
function....as it warms up, the oil thins & you are back to being worn
out...$995 for a rebuild is eventually the only cure..
 It is also possible that the 3rd/4th slider hub is cracking and starting
to misalign somehow....You might put Dino oil back in for a temporary fix
if it was OK before you changed the oil...Good Luck
Daryl of AA Transaxle
Duvall, WA.(Seattle area)
(425) 788-4070
1-877-377-0773 toll free
http://www.aatransaxle.com (web site)
On Sun, 14 Jan 2001 23:30:36 -0400 Chad <groch@WORLDCHAT.COM> writes:
> After searching the archives I could not come up with an answer to my
> problem. I experience a grinding noise whenever I shift into 3rd
> from both
> 2nd and 4th. This only happens when the van is warmed up. It doesn't
> happen
> when cold; in fact it shifts very well when it is cold. The archives
> said
> that shifting usually gets better as it warms up. I just had the
> tranny
> filled with 80w90 synthetic gear oil. Could this be a possible
> syncros
> problem???
> thanks
> Chad 85GL