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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

M5OD vs. ZF

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Old Jan 11, 2006 | 06:24 PM
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M5OD vs. ZF

I'm selling my '93 F-series and building/driving my bronco in its place, using the $$$ from the truck to do some work to the Bronco and I need the OD over the NP435s 1 to 1 high gear.

Would the M5OD be strong enough behind a lightly modded 4.9 that would be used for trails and some mud/sand? Or should I just go with the ZF?
 
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Old Jan 11, 2006 | 06:26 PM
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For offroading, the ZF is going to be better because of the granny low gear. I have a T-18 in my truck, and even in low range I wish it would go a little slower sometimes.

As far as strength goes, the M5OD will hold up behind a six no problem.
 
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Old Jan 11, 2006 | 06:31 PM
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Since you say the ZF for off roading I might go that route, after college the Bronco is going to become a serious off-road rig.

I've heard of strength problems with the M5OD.
 
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Old Jan 11, 2006 | 06:35 PM
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the ZF hands down. the M5OD has a hard enough time stock.
 
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Old Jan 11, 2006 | 06:36 PM
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Thanks, does the ZF have the same internal slave cylinder as the M5OD?

And what about the input shaft spline count?
 
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Old Jan 11, 2006 | 06:40 PM
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They are interchangeable, so whatever the spline count is, they're the same.

If you're going to be doing 'hardcore wheeling' then the ZF all the way. The M5OD is hit and miss. I have over 150k on mine, and it still shifts great. One of these weekends I'll drain the original fluid out of it, too.

Not sure about the slave cylinder - try checking the part numbers online. If they're different, well...
 
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