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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Zf5 detent pin problem?

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Old Jun 24, 2019 | 03:18 PM
  #1  
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Zf5 detent pin problem?

Just got done rebuilding the zf5 for my 460 f350 4x4. The last step was to measure shim thickness and preload on the main and counter shafts. I got that all taken care of and by the instructions, reassembled the case. Before I called it quits, I stood it up on end and rowed through all the gears using my other hand to spin the input shaft to make sure I have engagement on all gears, no problem. The next morning I spent a couple minutes installing the detent plugs, springs, and caps. Later that night after work I was admiring my accomplishment when I shifted it into a gear (not sure which one) and the cap on the furthest passenger side shot out of the bore as well as the spring. The detent plug stayed in.

2 questions, first, I’m assuming the bore got loosened up and I’ll just have to figure out a way to keep the cap retained. Is this a common problem?? Secondly, does this have anything to do with why I cant seem to get it into first gear or reverse now?

Just trying to to see if there’s any relation to the problem since that’s the only difference in when it worked until now it doesn’t. Thanks everyone!
 
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Old Jan 12, 2020 | 01:07 AM
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ever figure it out??? im having similar problem. the spring and cap would shoot out because its under pressure upwards. the detent has pressure on it downwards.... cap, spring, detent pin
 
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Old Jan 12, 2020 | 02:34 AM
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Yes, it barely goes in the hole, just flush the cap with the top of the case. You may need to purposefully deform the case or cap if it won’t stay in.
 
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Old Jan 12, 2020 | 02:59 AM
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you stated 1st and reverse wouldn't go into gear??? it goes in now?? was the detent frozen or stuck in bore??
 
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Old Aug 9, 2020 | 07:32 PM
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How did you get it to stay in? 2020 and I'm having the same problem
 
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Old Aug 10, 2020 | 02:36 AM
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Yes, bought new detent pins, and Installed properly. that’s the reason it wouldn’t go into gear.
 
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