* Chrysler synchomesh fluid #4874464 * Penzoil Synchromesh Fluid #18106 * Quakerstate Synchromesh Fluid #59634 * GM synchromesh fluid #12345349 * GM synchromesh fluid 12345577 * Havoline MTX fluid #1874
It's called synchromesh. You can pick it up at GM, or most parts stores should carry it. I found it at AutoZone......Made by Pennzoil.
I prefer Pennzoil synchromesh
Pennzoil Synchromesh Manual Transmission Fluid
GM synchromesh
Synchromesh Fluid GM P/N 12345349 or Equivalent
2.3 quarts of 10w-30 motor oil. I prefer GM Synchromesh.
engine probably 10-30. tranny if auto matic. probably dot 3 type. manual 70-9-weight gear oil. some tranny use brake fluid in the tranny if the system is a hydralic clutch. hope it helps. duboff Be careful; don't put brake fluid in the trannie.... Gm Synchromesh is preferred but many say that the Pennzoil synchromesh is the same formulation and it's much cheaper. The spec is for 80W90 GL-5 oil. No brake fluid in the trannie but use it in the clutch hydraulics.
Pennzoil makes a great product called synchromesh but any GL3 or GL4 fluid will work Pro's like Redline MTL
GM synchromesh fluid is a silvery grey color. It may be that someone changed your fluid and used that instead.
Pennzoil Gearplus GL-4 80W90 (stock # 21176)
The 1988 GM service manual specifies "Syncromesh Tranmission Fluid" GM part number #12345349 for both the Getrag and Isuzu tranmissions. It is available from any GM parts shop and from most general automotive parts stores. The GM specification No. is 9985648. It is a "Gear Lube - Special" by API standards Your safe bet is to use a lube that conforms to GM specification No. 9985648. Multiple suppliers make transmissions lubes to this spec: QUAKER STATE®SYNCHROMESH FLUID PENNZOIL® SYNCHROMESH FLUID AMSOIL Synthetic Manual Synchromesh Transmission Fluid Others transmission lubes may also work just fine. For your application they may be better or worse than a spec 9985648 lube. If you have non standard applications, such as heavy towing or high RPMs you may want to examine: Red Line D4 ATF; Red Line MTL Valvoline Durablend ATF Amsoil ATF Mobil 1 ATF