Loose Pinion
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Aid, you jacked up the vehicle by four inches, you had a vibration (driveshaft?) followed by the destruction of one of the toughest rear ends know to man. That suggests to me that the pinion angle was wrong and that the driveshaft was skipping rope.
Not to insult you but you know that the angle of the gozoutta on the transmission and the angle of the gozinta on the pinion should be equal. Like the parallel lines on top and bottom of a flattened "Z".
Not to insult you but you know that the angle of the gozoutta on the transmission and the angle of the gozinta on the pinion should be equal. Like the parallel lines on top and bottom of a flattened "Z".
Thread Starter
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Senior User
Joined: Aug 2012
Posts: 252
Likes: 0
From: Corvallis, OR
Aid, you jacked up the vehicle by four inches, you had a vibration (driveshaft?) followed by the destruction of one of the toughest rear ends know to man. That suggests to me that the pinion angle was wrong and that the driveshaft was skipping rope.
Not to insult you but you know that the angle of the gozoutta on the transmission and the angle of the gozinta on the pinion should be equal. Like the parallel lines on top and bottom of a flattened "Z".
Not to insult you but you know that the angle of the gozoutta on the transmission and the angle of the gozinta on the pinion should be equal. Like the parallel lines on top and bottom of a flattened "Z".
I need to lower the pinion carrier bearing and maybe shim the axle.
Also to clarify. The truck drove fine for a year and 11 months. The vibrations just started. I drove it a few time and parked it. Just got it in the garage and looked at it.
Thread Starter
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Senior User
Joined: Aug 2012
Posts: 252
Likes: 0
From: Corvallis, OR
I will take measurements before it goes out on the road again.
I need to figure out what the max angle the first half of the driveshaft can take so I can lower the carrier. Then when I lower the carrier I'm hoping the pinion lines up and I don't have to shim it. I'll find out when I drop the carrier..
I finally have a real garage that I can work on the truck in, instead of the gravel next to my old house.
I need to figure out what the max angle the first half of the driveshaft can take so I can lower the carrier. Then when I lower the carrier I'm hoping the pinion lines up and I don't have to shim it. I'll find out when I drop the carrier..
I finally have a real garage that I can work on the truck in, instead of the gravel next to my old house.
Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Pinion Angle - Wolfe Race Craft
This will tell you what you need to know. Get an angle-measuring protractor; don't guess. And while the drive shaft is down, remember that you have hammered the bejesus out of the U-joints. Replace them, cheap insurance.
Come back in if you get in trouble.
This will tell you what you need to know. Get an angle-measuring protractor; don't guess. And while the drive shaft is down, remember that you have hammered the bejesus out of the U-joints. Replace them, cheap insurance.
Come back in if you get in trouble.
Thread Starter
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Senior User
Joined: Aug 2012
Posts: 252
Likes: 0
From: Corvallis, OR
Pinion Angle - Wolfe Race Craft
This will tell you what you need to know. Get an angle-measuring protractor; don't guess. And while the drive shaft is down, remember that you have hammered the bejesus out of the U-joints. Replace them, cheap insurance.
Come back in if you get in trouble.
This will tell you what you need to know. Get an angle-measuring protractor; don't guess. And while the drive shaft is down, remember that you have hammered the bejesus out of the U-joints. Replace them, cheap insurance.
Come back in if you get in trouble.
Thanks for the link. I'll report back.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
WARNING. DON'T TRY THIS AT HOME!
I don't know about OP John, but I can tell you I did the same thing to the 9" in my brand new 79 Bronco back in the day. I guess you can say I was young and stupid. My girlfriend at the time was chewing on me pretty good one morning over something out of my control. So in a fit of rage I reved up that 351M tighter than a drum and dumped the clutch with it in granny gear. Broke the driveshaft, yoke, and split the case like this OP. The front drive axle pulled me in to work that morning. Lucky for me the Service manager at the Ford dealer I worked at on the back parts counter Loved me as being one of his Parts Men. He coned Ford in to paying the tab on my Bronco.
Thread Starter
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Senior User
Joined: Aug 2012
Posts: 252
Likes: 0
From: Corvallis, OR
Picked up the new 3rd member last night. Haven't had a chance to look at it closely yet.
Also got new axle seals, u-joints, and pinion seals.
The carrier was red, thats the only thing that looked different.
Also got new axle seals, u-joints, and pinion seals.
The carrier was red, thats the only thing that looked different.
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Fleet Mechanic
Joined: May 2001
Posts: 1,396
Likes: 4
From: Cupertino
Yeah, Jeff, I guess there is no limit to what a kid can do to equipment. Here is one of my stories:
Craftsman used to replace any broken tool. I broke plenty. One day about sixty years ago I went in with an 18" breaker bar. It had a bend and the swivel was busted off. The clerk said he would give me a new one if I told him how I did it. So I told him. We were taking the pinion nut off a rear end, wouldn't move so we put a four-foot cheater around it and jacked the car down.
Lots of laughs a parts counters, huh?
Craftsman used to replace any broken tool. I broke plenty. One day about sixty years ago I went in with an 18" breaker bar. It had a bend and the swivel was busted off. The clerk said he would give me a new one if I told him how I did it. So I told him. We were taking the pinion nut off a rear end, wouldn't move so we put a four-foot cheater around it and jacked the car down.
Lots of laughs a parts counters, huh?
Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
Make sure the ring and pinion gear teeth are clean (no dirt or surface rust on the drive and coast sides of the teeth).
If the teeth have rust pits in them, the gears may turn out to be noisey.
Thread Starter
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Senior User
Joined: Aug 2012
Posts: 252
Likes: 0
From: Corvallis, OR
If your backlash reading is correct, it has too much. Backlash tolerance should be .008"-.012".
Make sure the ring and pinion gear teeth are clean (no dirt or surface rust on the drive and coast sides of the teeth).
If the teeth have rust pits in them, the gears may turn out to be noisey.
Make sure the ring and pinion gear teeth are clean (no dirt or surface rust on the drive and coast sides of the teeth).
If the teeth have rust pits in them, the gears may turn out to be noisey.
I'll watch some videos.
Lead Driver
Joined: Apr 2011
Posts: 6,399
Likes: 40
From: El Dorado, Arkansas
If you have a Ford truck shop manual for a '72, it will show you how to setup the 3rd member and it will give you the tolerances and torque specs for it.