GM TH400 automatic transmission unit

GM TH400 automatic transmission

The secret of longevity:

Change oil and filter frequently

Flush cooler for time to time

Keep oil cool

When changing oil, disconnect top hose from oil cooler and run engine until oil stops draining, shut down engine and reconnect hose. When refilling use Dextron II ATF. Fill to top mark then run engine, keep alternately topping up and running engine until oil comes up to bottom mark. Oil level will gradually come up to top mark after engine has been stopped for some time.

In event of failure take the unit to Newbury Auto Transmissions in Boundary Road