O/T ford diesel

I remember reading a thread at thedieselstop.com where they were trying to stuff a ZF 5spd auto in a 2000??? and they ran into a convertor length problem.

Maybe the convertpr was longer so it would require all from the engine back including new cross member and adapter plate. You'd have to look up the thread for details of there problems.

T_Bone

The flywheel is not the same , 7.3 uses a dual mass flywheel and 6.9 does not. The 5 speed is an overdrive trans and low gear is fast enough to be 2nd or 3rd when used with a set of rear
gears that go with a direct trans. The 4 speed is an american made trans , the 5 speed is a ZF ( german) and is not one of their better trys at building a trans. The o/d is a small add on section in the back with separate lube and some bearings that are only available from ford. The 5 speed was designed to work with a 5.44 rear gear set and yours should be a 3.55 or if some fool ordered it maybe a 4.10.

george

About the gear ratios - how do you figure the 5 speed is designed for a 5.44 axle ratio? That truck would be revving at 2800 RPM at 65 MPH which is not good for a diesel. It would be awful to drive. Most of the 6.9 diesel Fords with C6 autos came with 3.55s or 4.10s. A 3.55 with a ZF5 will rev 1850 RPM at 65 MPH, and with a 4.10 it will rev around 2100 RPM which is a great setup for an rig used for towing and light use.

My Dodge with the Cummins 5.9 has the Gertrag 5 speed and 3.50 axles and works great - for towing and for highway driving.

Gertrag 5 speed is geared: 1st 5.53 2nd 3.02 3rd 1.60 4th 1.00 5th 0.77

ZF 5 speed for diesel is geared: 1st 4.14 2nd 2.37 3rd. 1.42 4th 1 5th .076

The trucks with 4 speed or auto trans and 3.55
really drove nice . Those with 4.10 had hard time
maintaining speed on a hill, had to lug down too
far for the next shift to not run up against the governor.(Those had the auto trans )

george

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