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Old Jul 6, 2018 | 01:34 PM
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Please help!
I was driving along in my 1976 f350 390 np435 4 speed, and all of a sudden I can't down shift to 2nd, it only grinds. If I am completely stopped it goes in just fine. I have adjusted my clutch linkage with no luck. I just want to see if anyone knows what the problem could be. Possible broken clutch finger?
 
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Old Jul 6, 2018 | 01:47 PM
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Sounds like a trashed syncro.
 
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Old Jul 6, 2018 | 03:05 PM
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I second that, that's about all that would cause it to grind. I had the same problem and it didn't look all that bad but in the end that's what was wrong.
 
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Old Jul 6, 2018 | 04:23 PM
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Me 3rd but for S&G check the lube level being low might cause that.
I think it takes 80w-90 gear oil.
Dave ----
 
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Old Jul 6, 2018 | 05:44 PM
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Originally Posted by FuzzFace2
Me 3rd but for S&G check the lube level being low might cause that.
I think it takes 80w-90 gear oil.
Dave ----
Lube is full and looks like new.. First to second does great, but third to second doesnt
 
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Old Jul 7, 2018 | 05:10 AM
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try double clutching, if it works then it's the syncros.
 
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Old Jul 7, 2018 | 07:51 AM
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Originally Posted by EricJ
try double clutching, if it works then it's the syncros.
Exactly! Matching your rev's should do the trick if the syncro is bad.
 
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Old Jul 7, 2018 | 11:33 AM
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I have to be going uncomfortably slow in 3rd before 2nd takes. Or itll grind just the same as you describe. Im going to consider upgrading to a 4spd with overdrive over the next cpl of years. Ive yet to drive a 4spd granny low that wasnt jenky in its downshifting and didnt have a sloppy loose shifter.
 
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Old Jul 7, 2018 | 12:14 PM
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NP435 has nylon inserts on the shift forks. 1/2 use different inserts than 3/4.

Shown as 7C430 in pic:

 
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