What are the weak points in the ZF 5 speed. - Diesel Forum - TheDieselStop.com
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Power Strokes 1994-1997 Upgrades and Aftermarket Upgrading or adding OEM or aftermarket equipment to your 1994-1997 Ford F-Series with Power Stroke engine.

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Old 02-23-2007, 08:36 PM   #1 (permalink)
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What are the weak points in the ZF 5 speed.

When I have my engine out I will be going through the tranny as well because it has the low rpm growl. I am wondering if there is anything I can do to beef it up to make it last behind a set of stage ones and a D66.
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Old 02-24-2007, 07:43 AM   #2 (permalink)
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Re: What are the weak points in the ZF 5 speed.

I dont think you'll have a whole lot of problems. Just make sure you update to a single flywheel clutch that will hold more power. If you really wanna go over board you could put in a bigger input shaft, but for what your planning you really dont need it.

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Old 02-24-2007, 09:42 AM   #3 (permalink)
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Re: What are the weak points in the ZF 5 speed.

Your low rpm growl is normal. It is called gear rollover.
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Old 02-24-2007, 01:41 PM   #4 (permalink)
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Re: What are the weak points in the ZF 5 speed.

replace the dmf with a smf and a good clutch kit, fill it with some mobil and it should last awhile [img]/ubbthreads/images/graemlins/grin.gif[/img]
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Old 02-24-2007, 04:48 PM   #5 (permalink)
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Re: What are the weak points in the ZF 5 speed.

You should be fine with a stock tranny. I think the weak point is the input shaft (which is larger on the 6-speed). There was talk of someone waaay back looking into making a custom, larger, input shaft for the 5-speed, but I'm not sure it ever materialized. Cheers!
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Old 02-24-2007, 05:01 PM   #6 (permalink)
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Re: What are the weak points in the ZF 5 speed.

[ QUOTE ]
You should be fine with a stock tranny. I think the weak point is the input shaft (which is larger on the 6-speed). There was talk of someone waaay back looking into making a custom, larger, input shaft for the 5-speed, but I'm not sure it ever materialized. Cheers!

[/ QUOTE ]

IIRC southbend has an upgraded input that is the same size as the 6 speed.
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Old 02-24-2007, 05:46 PM   #7 (permalink)
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Re: What are the weak points in the ZF 5 speed.

I did not see it on there site.
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Old 02-24-2007, 10:59 PM   #8 (permalink)
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Re: What are the weak points in the ZF 5 speed.

I need a new input shaft and some other parts, anyone know if this upgraded shaft is for real ?
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Old 02-25-2007, 02:00 AM   #9 (permalink)
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Re: What are the weak points in the ZF 5 speed.

I know the growl may be normal but I dont like it. It makes the truck sound like a real Junker, especially when the tranny is hot. Sounds like the world is coming to an end from under my truck. I already have a Luk flywheel and clutch kit so I should be all set.
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Old 02-25-2007, 11:32 AM   #10 (permalink)
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Re: What are the weak points in the ZF 5 speed.

Give this guy a call, he's got a heavy input shaft and all kinds of clutchs from stock to dd's and the prices are really good [img]/ubbthreads/images/graemlins/wink.gif[/img]. His names Kenny by the way.
http://www.kennysmachine.com/index.cfm
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Old 02-26-2007, 04:36 PM   #11 (permalink)
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Re: What are the weak points in the ZF 5 speed.

[ QUOTE ]
Give this guy a call, he's got a heavy input shaft and all kinds of clutchs from stock to dd's and the prices are really good [img]/ubbthreads/images/graemlins/wink.gif[/img]. His names Kenny by the way.
http://www.kennysmachine.com/index.cfm
Matt

[/ QUOTE ]

sent an e-mail, will post what he says.
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95 PSD crew cab LWB 5 speed KP D60. Converted to 4wd from 2wd (wow, what a job!). Custom RSK with SD springs. 290k miles and running strong. SMFW conversion, 3" DP, 1.0 A/R exhaust housing on rebuilt turbo.
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Old 02-27-2007, 01:18 PM   #12 (permalink)
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Re: What are the weak points in the ZF 5 speed.

[ QUOTE ]
Give this guy a call, he's got a heavy input shaft and all kinds of clutchs from stock to dd's and the prices are really good [img]/ubbthreads/images/graemlins/wink.gif[/img]. His names Kenny by the way.
http://www.kennysmachine.com/index.cfm
Matt

[/ QUOTE ]
[img]/ubbthreads/images/graemlins/shocked.gif[/img] [img]/ubbthreads/images/graemlins/phoney.gif[/img] [img]/ubbthreads/images/graemlins/vomit.gif[/img] You could wear out 2 south bends in the time it takes him to get back with you

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Old 02-27-2007, 05:31 PM   #13 (permalink)
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Re: What are the weak points in the ZF 5 speed.

well, so far no reply ... guess I will call.
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95 PSD crew cab LWB 5 speed KP D60. Converted to 4wd from 2wd (wow, what a job!). Custom RSK with SD springs. 290k miles and running strong. SMFW conversion, 3" DP, 1.0 A/R exhaust housing on rebuilt turbo.
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Old 02-28-2007, 03:11 PM   #14 (permalink)
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Re: What are the weak points in the ZF 5 speed.

He is in the process of moving into a new shop so that won't make getting ahold of him any easier

-Michael
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