ZF 5 speed- close or wide ratio - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

 
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post #1 of 12 (permalink) Old 06-01-2005, 04:23 PM Thread Starter
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ZF 5 speed- close or wide ratio

Do you guys know how to tell which one is in your truck. Trying to figure out which one I have in the 94. I didn't know there was two. Origanaly I was trying to compare the gear ratios between the 5 and 6 speed. Thanks.

1994 F350 CC SRW LB 4x4 5 speed IDI Diesel
1997 F350 CC SRW LB 4x4 5 speed Diesel
2002 F350 CC SRW LB 4x4 6 speed Diesel
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post #2 of 12 (permalink) Old 06-01-2005, 05:59 PM
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Re: ZF 5 speed- close or wide ratio

i think the difference is if it is for a 7.5 or 7.3. they have a little different ratio if thats what your looking for? [img]/ubbthreads/images/graemlins/shrug.gif[/img] [img]/ubbthreads/images/graemlins/smokin.gif[/img]

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post #3 of 12 (permalink) Old 06-01-2005, 09:14 PM
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Re: ZF 5 speed- close or wide ratio

the diesels have the close ratio which sucks as far as gearing goes....and gas engines have the wide ratio which is a lot closer to the NV4500 ratios....also in 96 they updated the close ratios in the diesels to something closer to the wide ratio but still not the same ratio's as the gas engines...hope that helps

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post #4 of 12 (permalink) Old 06-01-2005, 11:04 PM Thread Starter
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Re: ZF 5 speed- close or wide ratio

Thanks for the info. I got the ratio numbers from someone else on here when I asked this in the 7.3 diesel forum. They were the ratios for 6 speed and both 5 speeds. Now I know what I have in the 94.
Does anyone else know the numbers also.....see if there the same as my other numbers.

1994 F350 CC SRW LB 4x4 5 speed IDI Diesel
1997 F350 CC SRW LB 4x4 5 speed Diesel
2002 F350 CC SRW LB 4x4 6 speed Diesel
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post #5 of 12 (permalink) Old 06-02-2005, 11:24 AM
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Re: ZF 5 speed- close or wide ratio

i cant remeber if i saw them in my shop manuals or on steve baz's site or one of the other million places i've been too. but if i see them i will post it. [img]/ubbthreads/images/graemlins/smokin.gif[/img]

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post #6 of 12 (permalink) Old 06-02-2005, 01:40 PM
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Re: ZF 5 speed- close or wide ratio

I thought we had wide ratio boxes because Ford felt the broad torque band of a diesel could drag the rpms back up when you encountered the big rpm drop of the greater spread between gears. I also thought that this is why the gear split between 3rd and 4th is so big...

With a close ratio box, the rpm drop between each gear would be smaller (and better) and we would be better able to use our small rpm range. When towing heavy, the split between 3 and 4 is too big, sometimes you can't get enough uphill speed in 3rd to be able to run 4th. I looked at the ZF6 also, and I recall that 3rd is much closer to direct (4th) than our ZF5s...

Needless to say, but I'll say it anyway [img]/ubbthreads/images/graemlins/grin.gif[/img].... "Correct me if I am wrong"

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post #7 of 12 (permalink) Old 06-02-2005, 04:09 PM
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Re: ZF 5 speed- close or wide ratio

here are the ratios for the close ratio which is the diesel tranny...you will see the big difference in ratios between the wide and close ratio and then you will see why the gas engine is called the wide ratio...and actually the close ratio 3rd gear is closer to 4th than the wide ratio tranny...on my 94 F350 that i swaped in a 12V cummins i used the NV4500 which has ratios almost identical to the wide ratio ZF and it was great!!! I loved it...the close ratio gearing sucks IMO. You can also see why you can do 90mph in reverse!!! LOL



ZF S5-42 Close Ratio
3.79:1(Reverse), 4.14:1, 2.37:1, 1.42:1, 1:1, 0.77:1

ZF S5-42 Wide Ratio
5.24:1(Reverse), 5.72:1, 2.94:1, 1.61:1, 1:1, 0.76:1

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post #8 of 12 (permalink) Old 06-02-2005, 06:50 PM Thread Starter
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Re: ZF 5 speed- close or wide ratio

Hey ryanp, if you get a chance will you go look at my post in 7.3 engine and drivetrain forum called "ZF5 vs. ZF6" it might be on like page 3 or so. Look at the ratio numbers I was givin there, they are different for the close ratio than what you gave me (yours are higher). Let me know what you think. Thanks.
Brody

1994 F350 CC SRW LB 4x4 5 speed IDI Diesel
1997 F350 CC SRW LB 4x4 5 speed Diesel
2002 F350 CC SRW LB 4x4 6 speed Diesel
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post #9 of 12 (permalink) Old 06-02-2005, 10:40 PM
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Re: ZF 5 speed- close or wide ratio

no problem.... the ratios he gave you are for a 95 and newer close ratio ZF....the ZF-S5-42 is what came in the trucks from 87-94ish...then they updated the tranny and renamed it the ZF-S5-47 which had some internal upgrades and different ratios for the close ratio tranny. Probably from the numerous complaints of poor gear ratios in the older ZF. And then when they went to the ZF-6 they changed the ratios once again. Hope that helps.

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post #10 of 12 (permalink) Old 06-02-2005, 11:19 PM Thread Starter
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Re: ZF 5 speed- close or wide ratio

Yep, that helps alot. I appreciate your help. You just made me a smarter man! [img]/ubbthreads/images/graemlins/rolleyes.gif[/img]

1994 F350 CC SRW LB 4x4 5 speed IDI Diesel
1997 F350 CC SRW LB 4x4 5 speed Diesel
2002 F350 CC SRW LB 4x4 6 speed Diesel
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post #11 of 12 (permalink) Old 06-03-2005, 10:08 AM
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Re: ZF 5 speed- close or wide ratio

So we do have the close ratio boxes. [img]/ubbthreads/images/graemlins/phoney.gif[/img]

Guess that means the gear split could be even worse! [img]/ubbthreads/images/graemlins/frown.gif[/img] [img]/ubbthreads/images/graemlins/blush.gif[/img]

Cowboy350,
I read your post in the SD section. Do you find the shift from 3rd (? or is that 4th) to "direct" on the 6sp an easier transition to make when hauling a heavy load than with your old 5sp?

Good info!

TC
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post #12 of 12 (permalink) Old 06-03-2005, 04:10 PM Thread Starter
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Re: ZF 5 speed- close or wide ratio

TC, I haven't pulled a heavy load with the 6 speed yet, well once but it wasn't for very long. So far I have been using the old truck for all the hard work. From what I can tell the transition is a little better though. It's hard getting used to the higher gears.

1994 F350 CC SRW LB 4x4 5 speed IDI Diesel
1997 F350 CC SRW LB 4x4 5 speed Diesel
2002 F350 CC SRW LB 4x4 6 speed Diesel
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