Given that the 4L80E is the more powerful of the duo and is able to support more demanding applications, it’s pricier than the 4L60E. It’s more expensive price can be tied to its larger size and its use in engines with more horsepower.
Do you have to fill a torque converter before installing?
Not needed. Not only will you make it heavier and harder to install you’ll also make a mess while doing so. The transmission pump will fill the T.C. in no time once you start it after of course putting 5 quarts in before initial start up.
What transmission fluid goes in a 4L80E?
The 4L80 features a 310 mm torque converter. As to length, this transmission is 26-1/4″ long. In 2006, GM superceded Dexron III as the recommended fill with Dexron VI, which is backwards compatible with the earlier versions. The transmission typically accepts a 6.3 quart fill.