ZF S542 or 47... difference? which more desirable

[mickey556]

Ok back story, i have a S542 in my bronco with the 7.3 IDI diesel. I like the gear ratios, no complaints there.

in my F350 i have a C6 and will be buying a ZF5 to throw in and have it rebuilt over the winter for the spring swap.

My question to the masses, should i be looking for a S542 or 47. i know the ratios are different between the 2, and the 47 i believe has stronger synchros, or maybe the other way around.... The 47 was used in 96 and 97, while the 42 was used before that.

Given that i have a couple months to find it and get it rebuilt.... Which would you guys rather have? or prefer even. I dont really care how low the granny first is, its perfect in my bronco that i will haul anything i need to haul, the truck is more of a temp driver that i may end up handing over to my wife when i get the broncos engine overhauled :)

so recap, S542 or 47 and why? also if anyone has a link or information offhand the ratio difference between the 2 and how that effects the drive ability of a 90% on road *10% off road-ish hauling wood* truck. Thanks in advance.

[AbandonedBronco]

From what I've read

42 = 420 ft/lbs torque rating
47 = 470 ft/lbs torque rating


These gear ratios are from the transmission sticky at the top of the forum:

S5-42 (Diesel)
1st: 4.14
2nd: 2.37
3rd: 1.42
4th: 1.00
5th: 0.77
Reverse: 3.79

S5-47 (diesel)
1st: 5.08
2nd: 2.61
3rd: 1.53
4th: 1.00
5th: 0.77
Reverse: 4.66

S5-42 and S5-47 (gas)
1st: 5.72
2nd: 2.94
3rd: 1.61
4th: 1.00
5th: 0.76
Reverse: 5.24
Trans code: 2


What engine and final drive does the F-350 have?

[Steve83]

The difference is 50 ft-lb of rated torque capacity.

[GetBent4x4]

Wouldn't really matter for the idi since they aren't as powerful as the power stroke.

[kyleson]

A basic turbo'd IDI puts down over 500 ft lbs......

[GetBent4x4]

Hmm I always thought they were slow farm trucks.

[TheUnforgiven]

http://www.oilburners.net/forums/sho...DI-power-specs

http://www.dieselhub.com/idi/7.3L-idi.html

http://www.blueovaltrucks.com/tech/6_9-7_3-IDI.htm

[strokin7.3]

Originally Posted by GetBent4x4

Hmm I always thought they were slow farm trucks.

My stock 7.3 idi that I wish I would have never sold could run circles around my currently stock powerstroke.

[BronCummin5.9]

Originally Posted by GetBent4x4

Hmm I always thought they were slow farm trucks.

Diesels are slow by design. They make max power at low rpms, torque is the answer to moving heavy objects as well as torque multiplication , i.e. higher gear ratios. Not all diesels are created equal,and I just wish I could fit a 2stroke Detroit in my bronco! Those are balls to the wall bad @$$, and sound vicious with open stacks!

[mickey556]

Originally Posted by AbandonedBronco

From what I've read

42 = 420 ft/lbs torque rating
47 = 470 ft/lbs torque rating


These gear ratios are from the transmission sticky at the top of the forum:

S5-42 (Diesel)
1st: 4.14
2nd: 2.37
3rd: 1.42
4th: 1.00
5th: 0.77
Reverse: 3.79

S5-47 (diesel)
1st: 5.08
2nd: 2.61
3rd: 1.53
4th: 1.00
5th: 0.77
Reverse: 4.66

S5-42 and S5-47 (gas)
1st: 5.72
2nd: 2.94
3rd: 1.61
4th: 1.00
5th: 0.76
Reverse: 5.24
Trans code: 2


What engine and final drive does the F-350 have?

Sorry i apologize i didnt even see the trans sticky! This is exactly the info i needed! gears stay the same. so i can look for either. The F350 is a 5.8, and i believe its 4.10 based on RPM at 55 with the C6, did the math on it somewhere.

I didnt mean for the IDI, i have a hard time using the stupid touch keypad on the phone my wife bought me. The bko im happy with the 42 model, but from reading on FTE some threads were saying the 47 is stronger syncs or w/e but i couldnt back that up with anything via google search so i figured id ask the geniuses here :) Speaking of the IDI, just got the block back from the machine shop, had all 8 cyls sleeved to fix the potential issue of cavitation. Ill have to update my build thread... its LONG over due.

Thanks for the information, as always i appreciate it. Next up... 351W rebuild (after trans) perhaps ill do a write up on that. lots of good ones on this thread, but mine *might* be different *picked up a 800CFM blowthrough edelbroc blow through carb and a twin turbo setup off a wrecked 92ish 3000GT VR-4 today that i might just want to put to good use :)

Ok, done typing now. Thanks again guys!

[mickey556]

Originally Posted by strokin7.3

My stock 7.3 idi that I wish I would have never sold could run circles around my currently stock powerstroke.

I drove a 7.3 powerpuff excursion on a few job sites and i was COMPLETELY shocked that my 7.3 NA bronco swap had more shit and git on the mountain sides where we are putting int he pipeline south of pittsburgh PA. size/weight play a role im sure, the bko is smaller and a bit lighter, but still.

beyond that... i think the old IDI cant keep up. we have serveral guys with 6.0 and 6.4 powerpuffs and when i end of grabbing one of them for a fuel run or lunch run (or tonight a beer run) i know my idi is blown away. Course i was pushing hard mid 20 MPG consistant, they werent breaking 15-18 with their gear (i carry about 1400lbs of tools in the bko on worksites in case of machine failure. My excavator has been down 3 times this week, and we managed to fix it before our mech got there)

[strokin7.3]

Originally Posted by mickey556

I drove a 7.3 powerpuff excursion on a few job sites and i was COMPLETELY shocked that my 7.3 NA bronco swap had more shit and git on the mountain sides where we are putting int he pipeline south of pittsburgh PA. size/weight play a role im sure, the bko is smaller and a bit lighter, but still.

beyond that... i think the old IDI cant keep up. we have serveral guys with 6.0 and 6.4 powerpuffs and when i end of grabbing one of them for a fuel run or lunch run (or tonight a beer run) i know my idi is blown away. Course i was pushing hard mid 20 MPG consistant, they werent breaking 15-18 with their gear (i carry about 1400lbs of tools in the bko on worksites in case of machine failure. My excavator has been down 3 times this week, and we managed to fix it before our mech got there)

A chip (frito lay or dorito, your pick) will do wonders on a 7.3 stroke. They are pooches stock, especially with a 5 speed, but they do pull pretty well.