transmission nightmare
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transmission nightmare
Here's the story. I bought my 93 bronco knowing that the tranny was bad. I put a rebuilt one in and it ran fine. A few weeks later the rear main bearing seal started leaking like crazy. Took the trans out and replaced the seal. Put it all back together and now it feels like I got a bad u joint, but they all look good. Is there any way I could have put the flywheel on the wrong way. I know it's balanced but I figure it will only go on one way. Anybody know what might be wrong?
Post Fiend
Joined: Mar 2002
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From: Bonita Springs FL
They only go on one way. If it's an automatic, it's called a flexplate, BTW.
What are you feeling or hearing that leads you to believe it's a u-joint? Shaking? squealing? Does it come and go? Does it happen when you brake?
Where did you get the tranny from? Can you get it looked at under warranty?
What are you feeling or hearing that leads you to believe it's a u-joint? Shaking? squealing? Does it come and go? Does it happen when you brake?
Where did you get the tranny from? Can you get it looked at under warranty?
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From: Eglin AFB
make sure your mounts are good. also make sure that you didnt pinch any of the rubber on the mount itself. also check and make sure you didnt pinch any wires when reinstalling the transmission.
also did you make sure you torqued the flexplate to specs? that can cause the same thing.
also did you make sure you torqued the flexplate to specs? that can cause the same thing.
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It's almost like it shudders. But I guess I would describe it as more of a vibration. Oh, are you talking about the motor mounts. And no we did not torque the bolts on the flex plate. We didn't have a torque wrench at the time but we did tighten them down as tight as we could get them. But I really don't think that the flex plate is where my problem is because it only does it when I get over like 25 mph. And it doesn't happen when I brake.
93 bronco 302 e4od
93 bronco 302 e4od
Last edited by dallas lewis; Jan 4, 2006 at 11:46 PM.
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The tranny is full of fluid. No I did not mark the drive shaft but I have had it undone before and just bolted it back up and it didn't do that. But I guess it would only take about 10 min so I might as well try that. Thanks
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From: Austin
You can also just remove the rear drive shaft and run it in 4 wheel drive to see if it is the rear drive shaft...
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I've turned the drive shaft and my problem still isn't fixed. I really don't think it has anything to do with the flexplate or transmission. It still just vibrates at around 35 mph and higher. Again, it doesn't matter what gear it is in, it still does it. Please help, before I have to use go my last resort-- taking the trans out again.
Cargo Master
Joined: Aug 2004
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From: Lynnwood, WA
If you have a manual T-case put it into neutral, the tranny into D, and get to the RPM the vibration is noticeable, and see if it still vibrates. If yes, then the vibration comes before the driveshaft. With an electric T-case, just remove the rear shaft and make it a FWD car, and see if it vibrates that way.
Last edited by aurgathor; Jan 8, 2006 at 11:03 PM.
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Well, I would try the fwd thing but my 4 wheel drive is out too. Is there any way that I can troubleshoot and see if the drive shaft is out of line? I have had someone tell me that that is a possibility, but he didn't know any way to tell.
Senior User
Joined: Dec 2004
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From: Edmonton, Alberta
Be careful if you have the t-case in neutral and the tranny in drive. There is no way to stop the tranny from spinning and when you throw it into park you'll hear a heck of a clicking noise. Shut off the engine and then put it in park. MY drive shaft was stripped on the 79 and I didn't know it at the time and tried to put it in park from drive and got some funny noises. Good luck.
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From: Edmonton, Alberta
I read a thing about checking the drive shaft for out of balance. "They" (not me) recommended putting the rear axle on jack stands then putting the vehicle into drive and accelerating to 60 mph. Then using a grease pencil on a stick sliding it in towards the driveshaft at the rear until it JUST makes contact. That is the heavy side, they used a large hose clamp and small washers on the opposite side of the mark to balance it. The weighed it and permanently attached a weight to the drive shaft. They recommended doing this both front and rear of the driveshaft. If you do try this, be careful and have someone in the truck at all times (do NOT use the cruise control!)
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From: Stafford Springs,Ct
Did you have the vibration before you pulled the tranny to do the seal? If not then I don't think it would be the shaft unless you knocked off a weight. Before I would get under trying to mark the shaft while its moving I would bring it to a driveshaft shop and have it checked and balanced if needed.
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From: Hoboken, NJ...
Originally Posted by dwoodler
I read a thing about checking the drive shaft for out of balance. "They" (not me) recommended putting the rear axle on jack stands then putting the vehicle into drive and accelerating to 60 mph. Then using a grease pencil on a stick sliding it in towards the driveshaft at the rear until it JUST makes contact. That is the heavy side, they used a large hose clamp and small washers on the opposite side of the mark to balance it. The weighed it and permanently attached a weight to the drive shaft. They recommended doing this both front and rear of the driveshaft. If you do try this, be careful and have someone in the truck at all times (do NOT use the cruise control!)
That tip about heavy side and all that sounds like a half-*** way to balance a drive shaft.....IMHO