[49 Powerwagon]

Hi would like to use a ZF5 transmission adapted to a 4bt with
Ford adapter plate . Question is I believe I need the small block
like 1987 to 1995 with the casting 1307 s542 am I on the right
track will this work . Anything special I need to know or watch out
for . Thanks for the reply’s appreciate all info .🇺🇸🇺🇸

 

[char1355]

OK, think I can help you some. First off, there are 2 different ZF 5 speeds. The S5-42 you mentioned is the earlier style. Came in vehicles with the 351W V8. You didn't mention if your vehicle is 2wd or 4wd. The early 2wd ZF has an output for speedometer. The later S5-47 does not. Not a factor on 4wd units as Fords read off the transfer case. The S5-42 and S5-47 have the same gear ratios in the small block version. Those are 5.72, 2.94,1.61, 1.00, .76, and R 5.24. The ZF is a direct bolt up to the Cummins Ford adapter plate. No mods required. Flywheel pilot bear is the same also. Whatever clutch you decide is your call but the LUK brand seems to be popular. From an old post the LUK #98202 pressure plate and #76500 clutch disc. It is possible these numbers could have changed. If you find one up thru 1995 it should be the S5-42 and the part # begins with 1307.

 

[49 Powerwagon]

OK, think I can help you some. First off, there are 2 different ZF 5 speeds. The S5-42 you mentioned is the earlier style. Came in vehicles with the 351W V8. You didn't mention if your vehicle is 2wd or 4wd. The early 2wd ZF has an output for speedometer. The later S5-47 does not. Not a factor on 4wd units as Fords read off the transfer case. The S5-42 and S5-47 have the same gear ratios in the small block version. Those are 5.72, 2.94,1.61, 1.00, .76, and R 5.24. The ZF is a direct bolt up to the Cummins Ford adapter plate. No mods required. Flywheel pilot bear is the same also. Whatever clutch you decide is your call but the LUK brand seems to be popular. From an old post the LUK #98202 pressure plate and #76500 clutch disc. It is possible these numbers could have changed. If you find one up thru 1995 it should be the S5-42 and the part # begins with 1307.

Hi thanks for your reply
The vehicle will be a 1947 Power Wagon it’s 4 wheel drive but uses a
separate 2 speed transfer case that is not hooked directly to the transmission
only by a short drive shaft . So basically I’m thinking the 2 wheel drive ZF should
be the one I should be using . So I’m still a little confused as too which
one, so the s5-42 comes from the 351w and is from the gas version
will that hold up under the power of the 4 bt it’s only 105hp so I would
think so . Thanks for your input.

 

[Russ McLean]

.. . So I’m still a little confused as too which
one, so the s5-42 comes from the 351w and is from the gas version
will that hold up under the power of the 4 bt it’s only 105hp so I would
think so .

It is not the hp that tears up a transmission, it is the torque. I suspect that the S5-42 will hold up everyday use.

About 4 years ago, I put my 4bt (see signature below) on a chassis dyno. It is a 105 HP motor with a 120 HP turbo and a smallish air-to-air intercooler. From my notes:

EDIT: I am using the weaker M5R2 (a.k.a. M5OD)
"
TEST RESULTS: 1,500 to 2,800 RPM
148.9 HP @ 2,650RPM, 326.5 ft-lbs @ 2,250 RPM
The dyno pulls were all close. Removing the air intake system produced a very small improvement in torque. HP gain was at over 2,400 RPM. No practical gain to be made with a larger air box."

Russ

 

[49 Powerwagon]

OK, think I can help you some. First off, there are 2 different ZF 5 speeds. The S5-42 you mentioned is the earlier style. Came in vehicles with the 351W V8. You didn't mention if your vehicle is 2wd or 4wd. The early 2wd ZF has an output for speedometer. The later S5-47 does not. Not a factor on 4wd units as Fords read off the transfer case. The S5-42 and S5-47 have the same gear ratios in the small block version. Those are 5.72, 2.94,1.61, 1.00, .76, and R 5.24. The ZF is a direct bolt up to the Cummins Ford adapter plate. No mods required. Flywheel pilot bear is the same also. Whatever clutch you decide is your call but the LUK brand seems to be popular. From an old post the LUK #98202 pressure plate and #76500 clutch disc. It is possible these numbers could have changed. If you find one up thru 1995 it should be the S5-42 and the part # begins with 1307.

Thanks for your reply so here’s a pic of the small block ZF5 out of
a 1995 Ford so I’m pretty sure this is the one I need , just need
some clarification it’s the gas and not the diesel . Thanks

 

[eggman918]

That has the internal slave cylinder so should be the right one this shows a solid measurement to check

 

[char1355]

That transmission in your photos appears to be the small block version. If that is a 1995 model it should be a S5-47 and the part number would start with 1317. The S5-42 stopped with the 1994 model. For fun, I looked at a Ford cross reference list and they have about 120 different ZF transmissions beginning with the number 1307. LOL. I believe the ZF SB Ford 2wd part number is 1307-050-012. On the S5-47 you have to be careful because there were units in regular and modular SB Ford. Below are photos of the 2 different bolt patterns. The one in your photo is the regular type.

 

[Terry in Md]

Hi thanks for your reply
The vehicle will be a 1947 Power Wagon it’s 4 wheel drive but uses a
separate 2 speed transfer case that is not hooked directly to the transmission
only by a short drive shaft . So basically I’m thinking the 2 wheel drive ZF should
be the one I should be using . So I’m still a little confused as too which
one, so the s5-42 comes from the 351w and is from the gas version
will that hold up under the power of the 4 bt it’s only 105hp so I would
think so . Thanks for your input.

I am rusty on these transmissions, but I think you'll find the 42's were in all early applications regardless of engine. I know the diesels were because I have one in my Power Wagon

 

[char1355]

Terry, I think the ZF only came on the 351 and larger engines. I believe the 302 and 300 I6 only got the Mazda 5 speed. Not even sure the ZF came in any truck under 3/4 ton. I'd have to check my Ford book.

 

[IIVIIoonshiner]

The diesel version has a larger bell housing and different gearing.

 

[char1355]

That depends on which diesel version. The one that came in the F250/F350 had the close ratio gearing. The one in the F Super Duty (F450) had wide ratio gears same as the small block and big block gas versions.

 

[Mauser48]

That's absolutely a small block trans. I own an s542 small block, an s542 big block, and an s547 diesel. Look at the top rear half of the case. 1307 is sf42, 1317 is s547.