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Welcome to the forum! I'm another bay area guy. As far as the clutch goes I can only advise from what I've read. The single mass flywheel will be more durable but your tranny will be noisy. Replacing the dual mass is expensive but is friendlier noise wise until it dies again.The vibration with the hubs locked could be the driveshaft. On all new to me trucks I have the shafts balanced and new u joints installed. There is a real good shop in Pittsburg Ca. Do not go to the shop in San Leandro. I made that mistake once. Make sure they put new a boot on the shaft and grease the splines. Use good synthetics in the tranny, transfer case and the front and rear end. I use Redline myself and it's readily available in our area ( they are in Benicia ). Use a gasket on the rear end and Gasgacinch sealer. It will never leak. Make sure your vents aren't clogged also. Need a hand PM me.
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Pete in San Ramon
2005 F250 6.0 Lariat 4X4 CC short bed (Stock)
1997 F250 7.3 XLT 4X4 Reg. cab (Stock)
1986 F250 6.9 XLT 4X4 Gone but not forgotten

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