THis may be a day late and a dollar short, but the hydraulic clutch on the ZF can be bypassed if you legnthen the fork about one inch and use your normal manual linkage from your old tranny. Thats what I am goin to do. (I hope it works) I measured it out today, and based on swapping in the ZF in place of a NP435, that is the only kind of modification I will have to do aside from making the cross member angry. The ZF I have has an external slave cylinder that actuates the T/O fork. Good luck in your swap!
__________________ Tony
Quando omni flunkus moritati - when all else fails, play dead.
My brother has a 650 horsepower (equates to about 1200 foot pounds of torque) cummins with a stock NV 4500 and its lived up just fine. He just has a dual disc clutch in it. The NV 4500 does have a lower first gear than th ZF5, but not the ZF6. All three transmissions have a final drive of about .73 so that shouldnt be an issue. The issue with the 5th gear, as PGELLERS pointed out, is that the nut holding 5th gear on will work its way loose, then the gear will slide off the splines. The problem with this is that most people put them on with a hammer and chisel. The proper way to do this is to torque the nut to 275foot pounds. Also you should get self locking nut with an allen head screw to hold it tight. As for the ZF5 having a hydraulic clutch, youll want to put an all metal slave cylinder in it. I know a guy who had the plastic kind explode on him while driving across country. And as for the strength of a ZF5, my father dyno'd 797 foot pounds of torque on a stock ZF5 with only a hi-performance clutch in it. I hope this information helps. Good Luck!
I believe that the proper name for the Pre-97 ford tranny is zf-42 which is stock rated at 420ft/lbs of torque. the 97 and up are zf-47s and their rating is at 470ft/lbs. i'm sure the names are self explanatory... Of course i'm not 100% positive but i'm quite sure i read this information previously from a good source, can't site it... so google it
__________________
James
91' F150 XLT Lariat SC SB 5.0 4x4 M5OD
[LT Hooker's, Hooker true duals, 3.55, 14*BTDC] In progress: 418w:TFS TW 190FAC heads, Super Vic EFI intake w/elbow, 42lb'ers, 90mm TB, CI cam; 1 ton springs, 35"s, 5.13gears, D60 SAS, ZF S5-47
I believe that the proper name for the Pre-97 ford tranny is zf-42 which is stock rated at 420ft/lbs of torque. the 97 and up are zf-47s and their rating is at 470ft/lbs. i'm sure the names are self explanatory... Of course i'm not 100% positive but i'm quite sure i read this information previously from a good source, can't site it... so google it
The pre-95.5 is the ZF S5-42 and the 95.5-97's are the ZF S5-47. And yes you are correct on the output numbers but I know they will both handle much more torque than advertised
In my current employ we dyno test transfer cases at high loads. We use NV4500's almost exclusively. I have no experience with 5 speed ZF. I haven't personally used a ZF but other test engineers have broken an S6-650 where the NV4500 held up. Factory rating is 450 lb-ft, general consensus is stock they are good to about 600, more if you are careful.
I'm partial to the 4500 but it's a more complicated install on a Ford.
Why certainly the T-18,or NP-435 are a stronger choice of gearbox,in the 4 speed range,moving up to 5 speed territory,the ZF and NV4500 are great choices,with the stronger being a matter of personal opinion,I would give the NV the nod,just from what ive read about it in the past.
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