Trouble shifting into 3rd
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Senior User
Joined: Oct 2015
Posts: 445
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From: Bismarck, ND
Trouble shifting into 3rd
Hey guys so question for ya, took my truck out for a spin around the neigborhood and it started and shifted fine up until I tried to shift into 3rd. It seems occasional and maybe I just have to figure out the sweet spot for shifting but I was running about 3.5k rpms at the point of when I went to shift and ggrrrrrttt it grinded. Tried to again and it grinded again so by this point it was going too slow to shift into third so i went to shift into second but I had trouble getting into that also. It didn't grind it just wouldn't go into in. But as I slowed down it went in so I might have just not been going slow enough. But what's going? It doesn't always do this I have been able to shift before. So I doubt it's a clutch and maybe she's just acting up. Also I can't seem to find my transmission dipstick? It is a 4 speed.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
All my vintage trucks have manual transmissions....The dipstick is usually connected to the shift ball.
To the OP, depressing the clutch all the way?
What about pulling the fill plug and feelin' inside for the lube level?
To the OP, depressing the clutch all the way?
What about pulling the fill plug and feelin' inside for the lube level?
Thread Starter
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Senior User
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From: Bismarck, ND
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From: Mayfield, KY
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Cargo Master
Joined: Oct 2011
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From: Kenner,La.
shift problem
It may be the 3 rd gear sychronizer ring is either broken or just worn out. Try double clutching it into 3rd and see if that makes it easier. If you pull the top cover off you will see if the ring is broken. Those transmissions are not too hard to repair, just heavy.
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Thread Starter
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Senior User
Joined: Oct 2015
Posts: 445
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From: Bismarck, ND
It may be the 3 rd gear sychronizer ring is either broken or just worn out. Try double clutching it into 3rd and see if that makes it easier. If you pull the top cover off you will see if the ring is broken. Those transmissions are not too hard to repair, just heavy.
Post Fiend
Joined: Jun 2003
Posts: 8,209
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From: Black Hills of SD
The physics of smooth shifting is to slide it in when the rpms match the speed. That is basically what "double clutching" does. When I drive those old trucks, I rarely use the clutch after I'm moving.
I agree on synchro but there is another issue I've had happen. The rivets in the clutch arm pivot (inside the bell housing) will stretch out and eventually break, leaving you with no pedal, or a clutch that won't release. First symptom is harder shifting.
I agree on synchro but there is another issue I've had happen. The rivets in the clutch arm pivot (inside the bell housing) will stretch out and eventually break, leaving you with no pedal, or a clutch that won't release. First symptom is harder shifting.
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Senior User
Joined: Oct 2015
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From: Bismarck, ND
I feel like I have that issue. And willowbilly it's maybe cause I'm not letting the momentum catch up in the truck. Cause when I had attempted to double clutch (this was the second time it had grinded.) I had held it at around 3.5k for a bit longer
Lead Driver
Joined: Aug 2003
Posts: 7,592
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From: **** hole San Jose ca.
The physics of smooth shifting is to slide it in when the rpms match the speed. That is basically what "double clutching" does. When I drive those old trucks, I rarely use the clutch after I'm moving.
I agree on synchro but there is another issue I've had happen. The rivets in the clutch arm pivot (inside the bell housing) will stretch out and eventually break, leaving you with no pedal, or a clutch that won't release. First symptom is harder shifting.
I agree on synchro but there is another issue I've had happen. The rivets in the clutch arm pivot (inside the bell housing) will stretch out and eventually break, leaving you with no pedal, or a clutch that won't release. First symptom is harder shifting.
Plus I've had troubles with the shift stick guide rivet pins have warn out the two sides of the guilds on the ball socket. This makes the shift stick very sloppy an lets it turn in the lower shift rail making it hard to shift with out grinding.
With my old np435 my guess is it's catching the other shift rail to move when pushing it against another gear. If, I was not thinking about following the H shift pattern it would snag the other gear the grinds.
I had the shift stick grooved guilds welded up then used a hand grinder & a few hand files to reshape it back to what it is suppose to be like. Then it worked great not more grinding. This was my fix.
My 02 cents.
Orich
Cargo Master
Joined: Oct 2011
Posts: 2,241
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From: Kenner,La.
hard shifting
If it turns out that the rivets and or the pivot is the problem, the rivets can be replaced with some 1/4 " 28 counter sunk screws and lock nuts. some time the job can be done without having to pull the transmission or just back it out just enough to get to the rivets. Hopefully you will not have to pull the bell housing.