4 Speed Issues
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Senior User
Joined: May 2010
Posts: 350
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From: Spartanburg, SC
4 Speed Issues
I am experiencing issues with my 86 4x4 300 I-6. I was coming home from work today and crusing in 4th gear at about 50 on a down hill slope. I leveled off the throttle and started hearing what sounded to be gears grinding together. When I stepped on the gas, it was like the truck was in neutral instead of 4th. I pushed in the clutch, pulled to the middle and stopped. I put the truck in 2nd to go again, and when I let out on the clutch, it sound like gears grinding and it went no where. As I got further out on the clutch, it "caught" and jerked a little and started moving. I drove the rest of the way home without issue. When I left a little while later, it did it again as I was coasting up to a stop sign and pushed the shifter into 3rd. I pulled it back out and pushed it back into third and it caught again.
What could be causing this to happen?
What could be causing this to happen?
Elder User
Joined: Aug 2007
Posts: 537
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From: LaGrande,Ore
If I interperet things right, you probably have bearing issues in the trans. I think main shaft bearings. I would drain the gear oil and check for metal particles. Could also possibly be syncronizer rings failing. Whatever, it deserves a thorough look see and possible tear down. Just my thoughts and opinion. OBCB
Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
There are sometimes some good guys in the tranny forum, you might ask there, too.
Clutch, Transmission, Differential, Axle & Transfer Case - Ford Truck Enthusiasts Forums
Clutch, Transmission, Differential, Axle & Transfer Case - Ford Truck Enthusiasts Forums
Thread Starter
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Senior User
Joined: May 2010
Posts: 350
Likes: 2
From: Spartanburg, SC
Will do. I'm going to post it over on the Tranny Forum as you suggested and see what I get. I hesitate to take it anywhere until I kind of know what is going on. I don't mind putting a little money in it since it only cost me $500 bucks.
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Senior User
Joined: May 2010
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From: Spartanburg, SC
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Post Fiend
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From: Northern California
Post the trans code on the certification lable located on the drivers "B" pillar, just below the door striker bolt. One of us can decode it from that code.
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From: Charles Town, W bygod Va
Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
In 1981, a code of A is a New Process Manual 4-speed, I'm guessing an NP435 is what you
have but you might want to confirm that with the tranny guide posted above.
Discovered anything more with this problem? I personally don't know how it could be the clutch
that's causing this....
have but you might want to confirm that with the tranny guide posted above.
Discovered anything more with this problem? I personally don't know how it could be the clutch
that's causing this....
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
But, I'm not. 
I looked it up in my 1981 factory shop manual, and I don't trust the codes
to have not changed over the years....
I looked it up in my 1981 factory shop manual, and I don't trust the codesto have not changed over the years....
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Senior User
Joined: May 2010
Posts: 350
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From: Spartanburg, SC
No, I haven't. I'm not sure of the mileage on the truck, it says 63,000 miles, so it could be 163000, or 263000, not sure, but I'm guessing 163000 due to who I purchased it from and how often they drove it. It actually sat for 3 years prior to my buying it.
When you say it's the easiest to rebuild, does that mean it doesn't cost very much to rebuild?
When you say it's the easiest to rebuild, does that mean it doesn't cost very much to rebuild?