All "S" Series: Installation
WARNING: This page does not describe the selected car, but rather 28 other vehicles, including the 1985 GMC Vandura Special, 1985 GMC Vandura, 1985 GMC Value Van, 1985 GMC Suburban, and 1985 GMC Safari. However, it is still accessible from the selected car via links, so may be relevant.
Reverse removal procedures to install transmission, noting the following: On 77mm 4-speed, coat main drive gear bearing retainer and splined portion of transmission main drive gear with high temperature grease before installation.