Well i took the Comet for a good full throttle blast tonight and around 70 mph it starts to pick up a drivetrain vibration and doesn't go away.I took it up to about 90mph and it seems more noticeable if anything.I want to take the car to the track in a couple of weeks but not till i can fix this vibration problem.Any suggestions will be appreciated.Derek.
Drive shaft and joints are new and balanced,but i don't think the tires are.Would a tire balance problem show up at high speeds?The reason i ask is that my old 4x4 ford didn't have the tires balanced and it only shook around 40 mph then went away.Derek.
If.... ....it seems to show up at certain RPM ranges it would likely be in the drivetrain. If it shows up in only certain MPH, I'd look at tires/wheels. Bent wheel, bad balance, anything loose? Good luck. Seth
Well i checked and everything is tight,but there is alot of play in the rear of the trans.Can that bushing be replaced by removing the tailstock or do i have to dissasemble the trans [btw the trans is a t5] Derek.
Are the trans/driveshaft and pinion/driveshaft angles close to the same? If thats off by a bunch (front and rear ujoints won't cancel each other)that will cause a vibration.
You can rent a sleave puller to pull the bushing or you can remove just the extension housing and change it out be sure to have both the new bushing and seal. Lubricate both when you install them so that they don't run dry. Vaseline or ATF are all you need. Check the slip yoke for wear - a groove where the seal rides will cause a leak. You can repair it with speedi-sleeve and some sealant to go under the sleeve when you install it.
I had similar on my stock tires when I first got the car. What was happening was one of the "belts" was letting go, and as it hit about 50mph, it would stretch and throw the tire out of round. when I slowed back down, it relaxed and came back into round. Finally, it threw and stayed, and when I stopped and looked at the tire, it had a huge bump sticking out one side (kinda hard to explain). But, just the excuse I needed to clean up my Cragars and get some tires mounted on them. I also think I have the rear shaft problem on my trans. Anyone have details, or know of a thread with info/instructions to fix that? Would that be the source of some of the leak under my car? PaulS, is the extension housing just the last 6-8" on the trans, where the drive shaft comes out? I have "Overhauling Ford Transmission" book, I guess I could stop being lazy and take a look at that. Any idea on the price for parts and the time invested in this project?
Everything has a cause. That allways needs to be addressed. Sure regular wear can be a cause but excessive rear trans bushing play, in my experience, is caused by something else. Like a bad trans mount (trans angle to shaft) , an out of balance drive shaft, or tight/siezed u-joint(s). Tires like to seperate(belts shift around) That's where I start with any vibration complaint. Scooper, it's an easy job I'm sure you can handle it. Shop labor guides put it a about 1 hour for almost every american rear drive car/truck. And yeah, the tail section is the extension housing. I did one of these last week on a Suburban. It took less than 45 minutes. That's with a lift and air tools. I do recommend taking your time and making sure everything is clean before putting it back together.
If I leave the unit together and just pull the seal, will I lose fluid? I wouldn't think so, since it is pretty high up. Just want to be prepared so I can catch it, and not get it on my face. I found a section in my Haynes manual just for swapping this seal, so it must be a pretty common job. It also looked REALLY easy.
You might lose some fliud. Really depends on how the car is supported, angle of tranny, amount of fluid, etc. Usually a splash or so.
