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6 SPD LOST GEARS

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Old Sep 7, 2013 | 08:40 PM
  #1  
quality1construction's Avatar
quality1construction
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From: Roberta, GA
6 SPD LOST GEARS

I just lost 3rd and 4th gear in my 6 spd trans this evening, transmission was a reman 15 months ago and I just now put over 10k miles on it. Full of Mobil 1 ATF and have a Dieselsite trans filter installed . Any ideas what went wrong? R,L, 1, 2, AND 6TH seem to work fine.
 
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Old Sep 7, 2013 | 09:06 PM
  #2  
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F350-6
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From: Texas
Hope you got a 16 month warranty. Sounds like it needs to come apart to fix this. But your OP leaves one too many gears to chance. It's either L-5 or 1-6. Is the problem shifting up and down, or just in one direction? Depending on which 2 of the 3 gears that are missing, it could be different things, but unfortunately, they all lean toward the same thing. Pull the transmission and replace the broken stuff.
 
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Old Sep 7, 2013 | 09:16 PM
  #3  
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quality1construction
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From: Roberta, GA
Technically on the shifter its L, 1, 2, 3, 4 and D. Based on that 3 & 4 are gone. Was driving up the road in D, heard a heck of a grinding/clanking, truck jerked, shifter locked up, and they are gone. Shifting into those 2 are like being in neutral. Just wondered if anyone else has had a similar problem.
 
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Old Sep 8, 2013 | 07:37 AM
  #4  
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F350-6
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From: Texas
You could try pulling the shifter and top plate off and looking down inside there from in the cab, but if a shift fork or something came off, I'm guessing it's in a spot you won't be able to reach.
 
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Old Sep 8, 2013 | 09:56 AM
  #5  
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timmyboy76
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bummer to hear, man...seems to be the month of the zf6 breakdowns.
 
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Old Dec 14, 2013 | 05:25 PM
  #6  
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anotherfordguy
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Sounds like what happened to mine. I am rebuilding mine right now. The bearing between the input shaft and main shaft failed and broke the 3-4 syncro hub.
 
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