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Mazama,
For what it's worth, I've been running Redline MTL in my ZF for over 300K miles without any problems. I don't know if it shifts better, but it still shifts the same as when I got the truck new in 1992.
Paul
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1993 F-250 XLT 4x4 Reg Cab, 7.3 IDI w/ ZF 5 spd, Luk Clutch & Flywheel Kit, 3.55 gears, ATS Turbo, ATS Intercooler, ATS exhaust, Pyro & Boost gauges, K&N filter, Red Line synthetic fluids, Bilstein shocks, Leer Cab Shell (Winter only), Colibert front tow hooks, BF Goodrich All-Terrain TA KO's 33x12.5R16.5 (summer), Big-O XT's LT255x85R16 studded (winter), 324K+ miles
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