Hi guys, 5 years ago, i filled my 4-speed Muncie with GM Synchromesh fluid, based on recommendation from this board at that time. I'm going to replace my axle seals as one has started a slow leak, so i'm going to change the fluid while i'm in there. I called my local Pontiac/GMC dealership, and asked their Parts department if they had GM Synchromesh, and their answer was: "no, we don't have that stuff" o_O WTH? Have they phased it out in favor of something else/better?
What is the current opinion? What should i put in there? 20w-50? Hypoid gear oil? Captain Morgan? Guacamole? Advice appreciated, y'all.
Posts: 23 From: maplewood, MN, United States Registered: Jan 2008
Pennzoil makes Synchromesh fluid. It can be found at any Autozone, Advance or other parts stores. It is compatible with the GM Synchromesh so you can mix them if needed. However, I believe the 4spd should use 5w30. I could be wrong, might have to look up where I read that.
[This message has been edited by topher_time (edited 03-24-2008).]
Posts: 728 From: Mechanicsburg, PA Registered: May 2002