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Does the front transmission seal on a 1994 Chevy Blazer S10 4 wheel drive have to be put in from or behind pump plate?

The front transmission seal on a 1994 Chevy Blazer S10 4WD (assuming the 4.3L V6) is typically installed from the front, behind the pump plate. You don't usually remove the pump plate to install it.

However, access might require removing some components in front of the transmission to get to the seal. A shop manual specific to your year and engine is highly recommended for the proper procedure as there can be variations. Improper installation can lead to leaks and transmission damage.