NP435 1st gear grind
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5th Wheeling
Joined: Jul 2016
Posts: 43
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From: Chandler, AZ
NP435 1st gear grind
I have a 1986 Ford Bronco straight six 300 4 speed manual NP 435
She grinded a bit when shifting from a stand still but nothing terrible for an old rig but leaked oil bad from the rear main seal so I took out the tranny/t case to put in new clutch, throw out bearing, pilot bearing, and rear main seal. When I put it all back together shifting into 1st would grind like CRAZY. So would reverse but not near as bad. So I took it all back apart inspected everything even torqued the clutch to specification. Put it back together and same result. So I replaced the slave/master cylinder thinking the clutch wasn't pushing enough bench bled it and still no luck. Open to any suggestions
She grinded a bit when shifting from a stand still but nothing terrible for an old rig but leaked oil bad from the rear main seal so I took out the tranny/t case to put in new clutch, throw out bearing, pilot bearing, and rear main seal. When I put it all back together shifting into 1st would grind like CRAZY. So would reverse but not near as bad. So I took it all back apart inspected everything even torqued the clutch to specification. Put it back together and same result. So I replaced the slave/master cylinder thinking the clutch wasn't pushing enough bench bled it and still no luck. Open to any suggestions
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Joined: Apr 2004
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Being that 1st and reverse have no synchros, it is not unusual for them to grind when engaged when the vehicle is stopped. The friction of the pilot bushing/bearing is enough to keep the input shaft turning. Any turning will result in a grind. If the clutch had even a hint of engagement when the pedal is down, that will add to the problem. Again, not unusual.
Yours sounds like it's at the high end of things.
On level ground, will the truck roll when in gear with the clutch down?
Yours sounds like it's at the high end of things.
On level ground, will the truck roll when in gear with the clutch down?
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Joined: Apr 2004
Posts: 34,466
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Yes, that's the trick. But in the OPs case, I think he needs to be sure he is just dealing with the "normal" "everything's moving even in neutral", and not a tight pilot or dragging clutch.
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5th Wheeling
Joined: Jul 2016
Posts: 43
Likes: 1
From: Chandler, AZ
It ended up being the pedal height, thought I had to set right and my buddy took a look and tightened it up some more and presto she shifts smooth again. Still have minor grinding but it's the usual grind these old war wagons have.
Thanks for all the replies love using this forum!
Thanks for all the replies love using this forum!
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