ZF6 Issue... grinding in 1st and 2nd once in gear low rpm - Ford Powerstroke Diesel Forum

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post #1 of 12 Old 04-07-2014, 09:14 AM Thread Starter
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ZF6 Issue... grinding in 1st and 2nd once in gear low rpm

So I think the syncros are fine because it gets into 1st(not low) and 2nd just fine but if i'm going really slow I can hear and feel some light grinding. Once I get into it (higher rpm) it goes away. Seems to be worse when turning as well but is not exclusive to turning. Any idea what my issue could be? Thanks for the help!
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post #2 of 12 Old 04-07-2014, 09:20 AM
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gear rollover...normal. You can change the ATF in it, it'll help
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post #3 of 12 Old 04-07-2014, 09:21 AM Thread Starter
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Awesome, good to know that it is not a bigger issue. What would you suggest for fluid?
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post #4 of 12 Old 04-07-2014, 09:24 AM
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normal mercon V, changed every 50k. i did the Amsoil crap, and messed my tranny up, purdy good. Now its a concauction of fluids to "help"ur out....little bit of lucas tranny stuff, mercon V, some gear oil...i dont recommend what im running but its work'n for me...

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #5 of 12 Old 04-07-2014, 09:25 AM
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ive heard good things about about the purple "something' called syncromesh...but its expensive. Think mercon V is all thats needed.

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #6 of 12 Old 04-07-2014, 09:44 AM
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Sound like your clutch is not fully disengaging. How many miles on the truck and is it the stock clutch?

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post #7 of 12 Old 04-07-2014, 09:49 AM Thread Starter
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Originally Posted by sbluke55 View Post
Sound like your clutch is not fully disengaging. How many miles on the truck and is it the stock clutch?
I've looked into gear rollover and that def sounds like it. I would think that if my clutch was not disengaging all the way it would not by exclusive to 1st and 2nd gear at low RPM which gear rollover would be. Thanks for the input though! I'm going to give changing the fluid a try because it probably needs it anyway. Although, it sounds like this gear rollover is something Im going to have to live with as a ZF6 owner.
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post #8 of 12 Old 04-07-2014, 09:50 AM Thread Starter
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ive heard good things about about the purple "something' called syncromesh...but its expensive. Think mercon V is all thats needed.
Royal purple syncromax, I have heard a lot of good things about it but it is super pricey. As all royal purple products are.
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post #9 of 12 Old 04-07-2014, 09:08 PM
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You could also try the TonyBia mix.

3/4 full synthetic ATF
1/4 0w40 full synthetic
1 bottle of you choice of manual transmission additive/quiet.

I ran it for about a year, completely silenced my gear rollover and it was scary loud.

Please check out my 7.3 Enthusiast Facebook group! All are welcome! LINKY

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post #10 of 12 Old 04-08-2014, 04:26 AM Thread Starter
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How did the trans fair after that year? lol
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