Tubro 400 tailshaft &drive shaft Problem - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-16-2004, 10:24 AM
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Tubro 400 tailshaft &drive shaft Problem

I recently converted my 69 firebird from a powerglide trans to a turbo 400. I had a local shop shorten my driveshaft to fit the 400 when I got it back and assm. it I found that the yolk only engaged the tailshaft about half the length of the yolk. I was told that that was ok because it needed room to move with the suspention. This worked fine for a while but last night at the strip I picked up a bad driveline vibration so I loaded up and came home. Upon inspection of the car I found a bushing had came through the rear seal on the trans and the yolk would move all around in the tail shaft. I have a fair amount of automotive Knowledge but I know very little about auto transsmisions. Any help on what I should do would be much appricated Thank You very much Ron Anderson

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Old 05-16-2004, 05:10 PM
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I saw a couple of other people with simaler probs but with slightly differant reasons. Do any of you know if the drive shaft being too short could have caused the tailshaft bushing to slide through the rear seal and end up on the yolk.P.S. it did not destroy the seal like you might think the bushing just slid under the rubber lip in the seal. It did not even leak bad. Thank you for Any help
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Old 05-16-2004, 06:53 PM
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I believe the driveshaft is too short.

When I do one...I always push the yoke all the way in and then pull it out 3/4 to 1 inch. On most used yokes you can read it and tell where the old seal ran.

Maybe Crosley will see this and reply.............He is the transmission MAN........


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Old 05-16-2004, 07:00 PM
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Thanks I am going to put it over the pit monday and take it apart and look at it better. I hope it did not hurt any thing else but it has an ultra bell bellhousing and I think that protected it from breaking the trans case. I guess I will find out tomorrow
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Old 05-16-2004, 08:44 PM
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the drive shaft is to short. it should have no more than 1 inch of clearance. it would be best to get a drive shaft shop to make you one from scratch, & have it balanced! more than likely you have low gears in it, the drive shaft turns more rpm, & cause's more vibration. check out the tail shaft & make sure it didn't wallow out the place where the bushing goes.
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Old 05-17-2004, 08:07 AM
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Cool

if the drive shaft yoke does not go in far enough it will damage the bushing.

I always push the yoke in as far as it will go, pull it back 1 inch then measure for the drive shaft.

If the yoke does NOT seem to go in far enough, support the tranny and pull the tail housing off to see if there is a problem.


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Old 05-17-2004, 01:47 PM
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I found the problem today. My 400 has a bolt in slipyolk tailshaft and I had a standard slipyolk and out of ignorance I instaled the wrong slipyolk. It turns out that the output shaft on my 400 has a step in it that will not let a standard yolk engage the trans far enough and I measured the new drive shaft based on the wrong slipyolk. I am haveing a new high impact nitrous ready drive shaft built with 1350 u-joints and the proper slip yolk. I should be up and running in 3 weeks. Thanks every one for there advise!
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Old 05-17-2004, 06:50 PM
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I would use a slip yoke
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Old 05-18-2004, 02:59 PM
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Subtle hints missed.

Transmissions use a YOKE.

Eggs contain a YOLK.
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Old 05-18-2004, 04:25 PM
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Eggs transmissions whats the difference? I can break either one of them with ease!
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Old 06-01-2004, 07:08 AM
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I am having the exact same problem with my car and I'm wondering if you can help me out. I am ready for a new driveshaft but I am wondering what is the proper yoke for this application. I have heard that you need to have that step on the output-shaft machined down but I'm trying to avoid pulling out the transmission. If you would let me know the proper yoke for your application I would really appreciate it, cause when i'm going about 60-70 in my chevelle and turning about 4200 rpms things get a little crazy with the vibrations.

thanks,
Andrew
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Old 06-19-2005, 11:51 PM
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400 yoke

I have removed the tailhousing and ground down the step in the output shaft - IN THE CAR.
This is a very common problem, since there are so many TRUCK 400's out there
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