"...long live the tank
"
Definitely a tank!
Early model 105s had no transmission chip light. Had to 'periodically' inspect the mag plug via the clamshells then underneath the trans through an inspection panel in the interior. Of course if a 'deterioration' in power was noted, thence straight away with the check. Never saw a plug with more metal on it, and it was still in tolerance, although the xmsn was changed shortly thereafter.