ZF-S5/42 vs 47 - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 12-28-2011, 10:36 PM Thread Starter
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ZF-S5/42 vs 47

Time for a transmission swap. My 1995 has a v42 ZF5 in it now, and it's time for a rebuild.

The question is: Is it worth the effort to go with a v47, or just plan on another ~250k with the 42? My F250 is only modded with a 4" exhaust and a big intake, and I plan to stay that way. AFAIK, I've never driven a truck with a v47 transmission, but other than the slight gear ratio changes, I'm assuming it's more or less the same animal?

Thoughts?

TIA for any musings, rants or info.

~Bruce~
'95 F250 4x4 ECLB 295k - ZF5, Southbend, 4.10, van pedestal, EBPV & CCV delete, 1.0 ex housing, 3" DP, 4" exhaust, BFAF, 140v IDM, MagHytec diff cover, HD front springs, 16x8 alloys
'95 F-Superduty 4x2 CM 12' Flatbed 47k - E4OD, 5.13, Banks intercooler, van pedestal, EBPV & CCV delete, 1.0 ex housing, 3" DP, 4" exhaust, BFAF, PHP tunes, 6.0 fan, 140v IDM, TruCool, MagHytec diff/pan, Dieselsite external trans filter, Autometer gauges, 180w LED light bar
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post #2 of 12 Old 12-28-2011, 11:39 PM
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s47 is rated for more torque, IIRC.


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post #3 of 12 Old 12-29-2011, 07:22 AM
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47 is rated for more torque, I was under the impression only idi's had the 42 anyway, and that gearing was exact same.

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked
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post #4 of 12 Old 12-29-2011, 08:11 AM Thread Starter
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Thanks Glove & 351.

Interesting....ya learn something every day....S42 rated for 420, S47 rated for 470 ft/lb. I am certain my '95 (build date is 5/95) has a ZF-S5-42 because that's what's on the plate riveted to the side of it.

Nevertheless, the v42 would appear to be plenty strong for the job at hand I think.

~Bruce~
'95 F250 4x4 ECLB 295k - ZF5, Southbend, 4.10, van pedestal, EBPV & CCV delete, 1.0 ex housing, 3" DP, 4" exhaust, BFAF, 140v IDM, MagHytec diff cover, HD front springs, 16x8 alloys
'95 F-Superduty 4x2 CM 12' Flatbed 47k - E4OD, 5.13, Banks intercooler, van pedestal, EBPV & CCV delete, 1.0 ex housing, 3" DP, 4" exhaust, BFAF, PHP tunes, 6.0 fan, 140v IDM, TruCool, MagHytec diff/pan, Dieselsite external trans filter, Autometer gauges, 180w LED light bar
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post #5 of 12 Old 12-29-2011, 01:12 PM
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Sorry for not pointing out the torque numbers based on the trans name, lol looks like you figured it out.


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post #6 of 12 Old 12-29-2011, 02:04 PM
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the gear ratios are not the same the s42 is considered a close ratio and the s47 is a "wide ratio" in comparison. the s47 is soposed to be the smoothest to shift and is rated for the most TQ. sound like a no brainer to me

here you go..

S42 ZF5 Close Ratio
1st Gear:
4.14
2nd Gear:
2.37
3rd Gear:
1.42
4th Gear:
1.00
5th Gear:
0.77
Rev Gear:
3.79

S47 ZF5
1st Gear:
5.08
2nd Gear:
2.60
3rd Gear:
1.53
4th Gear:
1.00
5th Gear:
0.77
Rev Gear:
4.66

FRANK THE TANK
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post #7 of 12 Old 12-29-2011, 03:43 PM
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Hell a clutch can make up the torque difference lol, and overdrive is the exact same so good enough imho, just depends if you want your first couple gears to stretch out a bit, good luck either way

-Kris-
2000 excursion V10 2wd 230k
2000 Excursion 7.3 4x4 246k
1995 CCLB DRW 324K
2001 CCLB DRW 319K
Dp tuner infinity, exhaust, intake, chipped, tricked, and wrecked
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Quote:
Originally Posted by marine5811
The stock downpipe in an OBS is flat because I'm a ginger.
Quote:
Originally Posted by alberta 7.3
Finding a decent woman is like shopping for a used truck. You spend most of your time picking through the money pits, wrecks, and basket cases until you find one that you can tolerate
Quote:
Originally Posted by JJFLASH
Well at least you caught the loose bolts before they cause any damage. Nothing worse than a sloppy hole
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post #8 of 12 Old 12-29-2011, 04:09 PM Thread Starter
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If I can get my hands on a rebuildable 47, I might jump on it just for the 2nd/3rd ratios. Otherwise, I'll rebuild the 42. With 4.10's it'd be nice to have a longer 5th gear for interstate cruising, but I reckon that's what a car is for

My South Bend single mass conversion clutch came today...so I'm getting itchy to tear into the transmission now and see WTF was going on with the dual mass OEM clutch that's in there.

I had no idea Ford had changed the ratios, but good to know. Thanks!!

~Bruce~
'95 F250 4x4 ECLB 295k - ZF5, Southbend, 4.10, van pedestal, EBPV & CCV delete, 1.0 ex housing, 3" DP, 4" exhaust, BFAF, 140v IDM, MagHytec diff cover, HD front springs, 16x8 alloys
'95 F-Superduty 4x2 CM 12' Flatbed 47k - E4OD, 5.13, Banks intercooler, van pedestal, EBPV & CCV delete, 1.0 ex housing, 3" DP, 4" exhaust, BFAF, PHP tunes, 6.0 fan, 140v IDM, TruCool, MagHytec diff/pan, Dieselsite external trans filter, Autometer gauges, 180w LED light bar
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post #9 of 12 Old 12-29-2011, 04:42 PM
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The 47 seems like it's more for towing, I'd like one for my truck because first gear is lower and well I still have 3.55 in my truck.
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post #10 of 12 Old 03-19-2013, 05:48 PM
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I can't figure this dang site out. But I need to know if a 1993 7.3 idi S5-42 transmission will fit into a 1997 7.3 powerstroke. If not what do I need to make it work. It can't be to much different.
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