ZF6, hard 1st and 2nd gear - Ford Powerstroke Diesel Forum
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Old 12-20-2013, 06:33 PM
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ZF6, hard 1st and 2nd gear

Coming home tonight, I took off from a light in the wet and spun the tires. WHen I went to shift to 2nd it was hard to shift. Now it's crazy hard to move in or out of both 1st and 2nd gear. Rev, and every other gear is fine. Clutch feels fine and holds fine.

It does it even when the truck is off, like something is binding the shift fork.

Anyone else have an issue with this?
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Old 01-28-2014, 09:24 PM
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Update: the hub on the 1-2 syncro hub had broken. While I had it in to the trans shop, there was another ZF6 in there for the same thing.

The trans guy says the syncro design on these are very fragile.

Now that I have my trans back, the new 3rd gear syncro grinds. Awesome. POS trannies.
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Old 01-28-2014, 09:40 PM
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It's actually pretty rare for the zf6 to have problems, it's a very stout transmission.

Mine has 500 000kms on it, and the first gear syncro is just going now...

The fact that your new 3rd gear grinds says to me how much your tranny guy knows about these transmissions. The 1-2 syncros on these are beefy as all hell, double cone. They have some weak points sure but good operators and they will rarely come up ( shift forks mostly)
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Old 01-29-2014, 09:47 AM
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Quote:
Originally Posted by schlutzer View Post
It's actually pretty rare for the zf6 to have problems, it's a very stout transmission.

Mine has 500 000kms on it, and the first gear syncro is just going now...

The fact that your new 3rd gear grinds says to me how much your tranny guy knows about these transmissions. The 1-2 syncros on these are beefy as all hell, double cone. They have some weak points sure but good operators and they will rarely come up ( shift forks mostly)

I think it's unfortunate the new synchro grinds when it was only slightly chunky before. We're going to put in a new 3rd gear along with it this time. He's taking care of me.

But if you don't think ZF6s don't have problems, Google "powerstroke zf6 grinds 3rd gear" or "powerstroke zf6 1st 2nd hard to shift".

I was leary getting rid of my old auto for this truck.
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Old 01-29-2014, 01:17 PM
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I didn't say they don't have problems I said its rare. And it's true. They are an overbuilt trabsmission. I've been around a LOT of them.

They usually have syncro problems due to piss poor shifting habits and lack of fluid changes/quality fluid.

Because this engine takes a while to drop rpms people tend to ride the syncro's, and wear them out. Same habit causes the shift fork bending. I'm not saying you are guilty of that your likely haven't owned it since new but still.

Look up what dual cone syncro's are, they take a lot to wear out, but they are sensitive to good fluid
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Old 02-07-2014, 06:08 PM
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Quote:
Originally Posted by schlutzer View Post
I didn't say they don't have problems I said its rare. And it's true. They are an overbuilt trabsmission. I've been around a LOT of them.

They usually have syncro problems due to piss poor shifting habits and lack of fluid changes/quality fluid.

Because this engine takes a while to drop rpms people tend to ride the syncro's, and wear them out. Same habit causes the shift fork bending. I'm not saying you are guilty of that your likely haven't owned it since new but still.

Look up what dual cone syncro's are, they take a lot to wear out, but they are sensitive to good fluid
What exact fluid mix are you using in your trans? I know that you had posted it somewhere else before but have forgotten where.
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