GM Sychromesh Fluid # 12345349
 

1 qt Bottle with no viscosity on label

Ive tried reading up on this product with no conclusions

Anybody KNOW what manual transmissions this is meant for ??

I'm assuming its NOT correct for "old School" Muncie M21 etc

I used it in the M50 NV3500 in my S10.

How long ago did you buy this product? I have a one quart container of GM synchromesh trans fluid that was bought years ago that I have been using in a M-20. I"ll check the number and post back.

I got the above product several years ago with some auction materials I bought.....

Can I look for any label info to better help ID this oil/lube ???

I think I have part of a bottle in my shop. I'll look when I get out there.

Just posting back on the trans fluid. The # on mine is 89021808 and it states "Synchromesh transmission fluid. And further the label says "is specifically for use in GM manual transmissions. This product has excellent lubrication properties and does not break down. It withstands high temperatures and functions well in low temperatures. It is an amber colored, light bodied base product that is synthetic blend manual transmission fluid." To my surprise its an unopened bottle. I'm guessing I've had this at least a dozen years. So you can compare the literature on the containers. Frank

More than likely that oil you have is a GL5 and meant for the Tremec, T5 and most NV transmissions. The Muncie and BW T10 and NV4500 use the GL4. I wouldn't recommend using it in your Muncie. The synromesh fluid is generally a 5/30 while the GL4 is a 75/90.

Tommy

Some GL5 oils can damage the bronze rings and other yellow metals used in the older transmissions.

Tommy, I'll go with your GL5/GL4 answer ......I have maybe 5 unopened bottles that
I will try to sell at less than EBAY/Amazon Pricing ????

Thanks