Normally the OD only kicks on at high speed. It is like having an extra gear for highway driving. That said: My sister's 99? 200sx operates like yours. It shifts a lot stiffer when the overdrive is off. It is almost like having a shift kit in the thing. I only turn it on for highway driving anyway and when climbing a steep hill I turn it off because it is a gutless piece of crap and keeps shifting up and down between 3rd and OD.
Don't know if that helps you any.
Starlin
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'89 240 SX: Chrome Tinted Windows/5 speed
'67 Ford Fairlane: Edlebrock:RPM Intake/Cam & Lifters/750cfm Carb/Alum. Heads/Alum. Valve Covers/Alum. Air Filter, Hooker Headers, Griffen Alum. Radiator, Mallory Ignition Sys, 9mm Ford Racing Wires, Flowmaster Exhaust + misc = 560hp/12.6 sec 1/4 Mile
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