Ford F-350: 4x4el 6 speed manual transmission Jun 06, 2010I own a Ford F-350 4x4 7.3 L Diesel Pickup with 6 speed manual transmission. Sysptems are as follows. With motor running I cannot shift into any gear. With engine off, I can shift thru all of the gears with no problem. In )ct 09 I had a clutch failure and Ford garage installed new Hydraulic and slave master cylinders. Been fine until now. ford f350 6 speed manual transmission | eBay 1988-1997 Ford F250 F350 6 Speed Manual Transmission Shift Lever & Boot OEM NEW See more like this. FORD F250 F350 F450 6 SPEED MANUAL TRANSMISSION GAS 4x4 ID 2C34-BB 108K MILES. Pre-Owned. $1,995. or Best Offer +$300 shipping. Transmission Assembly Manual 4wd 6 Speed Diesel 01-03 Ford F250 F350 F450 F550 .