ZF6 ? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 10-16-2007, 04:56 PM Thread Starter
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ZF6 ?

Installed a SB con ofe clutch ,about 1k miles on it now .
you guys that thave swaped from stock to SB did you notice any more noise (rollover) in nuetral ? mine is terrible, had zero noise with the stocker. is there a heavyer fluid thats safe to run in a ZF? any help much appreciated

E '99 F-350 CC LB, ZF6, IDP -T4i Mount, Comp. Fuel System, , Reg. Return, Comp Valve springs, ARP's, DI P- Rods, Adrenaline HPOP, Isspro's, Detroit Tru Trac

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post #2 of 12 (permalink) Old 10-17-2007, 07:57 PM
 
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Re: ZF6 ?

My buddy switched to 50wt gear oil in his ZF5.

Gear oil is thinner for the same viscosity than motor oil, so it's not as thick as you would think.

It is holding up way better than ATF or Synth motor oil, that stuff would be cooked in 5000 miles. It stopped a hard shift from 1-2 though, used to be notchy and grind sometimes, now it goes in smooth.

May give that a shot.

He used synthetic 50wt gear oil.
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post #3 of 12 (permalink) Old 10-17-2007, 10:50 PM
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Re: ZF6 ?

Mine rattles quite a bit more now in neutral (with the DD) than it did stock. I've tried a couple of different kinds of lube in it, but it still makes noise (haven't tried and gear lube though).

Also, it used to "growl" on take-off in 1st or 2nd gear, from right below idle to about 800 rpm. Now it's gone in 1st & 2nd, but it's got the growl in other gears, 3rd & 4th...and at a higher engine/road speeds(12-1500 rpm).

Other than that, it's working great! At least it isn't slipping with a load on it!

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post #4 of 12 (permalink) Old 10-18-2007, 12:46 AM Thread Starter
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Re: ZF6 ?

i would have expected the DD to make noise in N after talking to Peter @SB.
not un-happy at all with the performance so far.
just didnt expect more noise in the a.m. than the motor makes

E '99 F-350 CC LB, ZF6, IDP -T4i Mount, Comp. Fuel System, , Reg. Return, Comp Valve springs, ARP's, DI P- Rods, Adrenaline HPOP, Isspro's, Detroit Tru Trac

238/200
ISM HX50
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post #5 of 12 (permalink) Old 10-19-2007, 05:04 AM
 
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Re: ZF6 ?

Gear oil is not thinner than engine oil for a given viscosity.

Gear oil is thinner than engine oil in SAE weight labels since they use different tables for gear and engine oils.

An SAE 85w90 gear oil is very similar in viscosity to an SAE 10w40 engine oil.
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post #6 of 12 (permalink) Old 10-21-2007, 12:42 AM
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Re: ZF6 ?

Quote:
Originally Posted by gregrob View Post
My buddy switched to 50wt gear oil in his ZF5.

Gear oil is thinner for the same viscosity than motor oil, so it's not as thick as you would think.

It is holding up way better than ATF or Synth motor oil, that stuff would be cooked in 5000 miles. It stopped a hard shift from 1-2 though, used to be notchy and grind sometimes, now it goes in smooth.

May give that a shot.

He used synthetic 50wt gear oil.
where did you find 50w gear oil?

2 fords that make no power
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post #7 of 12 (permalink) Old 10-21-2007, 07:38 AM
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Re: ZF6 ?

Quote:
Originally Posted by gregrob View Post
My buddy switched to 50wt gear oil in his ZF5.

Gear oil is thinner for the same viscosity than motor oil, so it's not as thick as you would think.

It is holding up way better than ATF or Synth motor oil, that stuff would be cooked in 5000 miles. It stopped a hard shift from 1-2 though, used to be notchy and grind sometimes, now it goes in smooth.

May give that a shot.

He used synthetic 50wt gear oil.

your syncros are probably getting worn out, hence the thicker oil took up that little clearance.

ZF's are made from the factory to run on ATF and running somehting thicker will definatly lead to a premature failure at some point.

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post #8 of 12 (permalink) Old 10-21-2007, 08:10 AM
 
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Re: ZF6 ?

Quote:
Originally Posted by jopes View Post
your syncros are probably getting worn out, hence the thicker oil took up that little clearance.

ZF's are made from the factory to run on ATF and running somehting thicker will definatly lead to a premature failure at some point.
What makes you think 50 wt gear is thicker than ATF? The relative viscosities are close to the same at the normal temp range for a transmission. See the chart in the fluids section.
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post #9 of 12 (permalink) Old 10-21-2007, 08:10 AM
 
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Re: ZF6 ?

Quote:
Originally Posted by Deerezilla View Post
where did you find 50w gear oil?
He works in a truck shop and that's what they fill the gearboxes in the road tractors with. I'll have to ask him where they source it.
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post #10 of 12 (permalink) Old 10-21-2007, 08:11 AM
 
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Re: ZF6 ?

Here is said chart:
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