Bob1: I think friction modifier is for the differential. I'm not a professional mechanic but I have only heard friction modifier used in reference to limited slip rear-ends. Could be wrong. Also, since you said you have a five speed I assume that it is a manual transmission since Ford doesn't make a five speed automatic. Anyway, torque converters are an automatic transmission component - they don't put them in manuals!
What has brought up this "need" for a friction modifier? What problems are you having?
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'97 F150 Lariat, Flareside, SC, ORP, 5.4, Mods: 305/70/16 GY ATS, AR Baja wheels, dual exhaust, Smittybilt nerf bars and fog light mod.
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