How much driveshaft clearance to tailhousing?
#1345529
12/03/12 06:27 PM
12/03/12 06:27 PM
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Joined: Feb 2005
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Mansfield, Tx
Jacob Pitt
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Mansfield, Tx
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Was under the car the other day after I put the new gears in and re-adjusted the ladder bars. On the ground there isn't much room from the end of the driveshaft yoke to the end of the transmission tailshaft. How much clearance do I actually need?
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Re: How much driveshaft clearance to tailhousing?
[Re: Jacob Pitt]
#1345530
12/03/12 06:36 PM
12/03/12 06:36 PM
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Joined: Apr 2005
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TN
SCATPACK 1
pro stock
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pro stock
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TN
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Old rule of thumb was +- 2" with springs. I think with ladder bar or 4 link, you could get by with less than this.
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Old Geezer Racing
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Re: How much driveshaft clearance to tailhousing?
[Re: MR_P_BODY]
#1345532
12/03/12 07:11 PM
12/03/12 07:11 PM
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Nebraska
72Swinger
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Nebraska
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If the tailshaft seal has a boot, 1/2" of slip yoke showing is plenty.
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Re: How much driveshaft clearance to tailhousing?
[Re: 440Jim]
#1345534
12/04/12 12:11 AM
12/04/12 12:11 AM
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Joined: Feb 2005
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Mansfield, Tx
Jacob Pitt
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Mansfield, Tx
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Yes it has a dust boot on it and the yoke is compressing it some at rest. When I got it back-halved the builder put in a bunch of pinion angle and I guess he did it to pull the driveshaft away from the transmission. I have corrected it and noticed how close they are now. I will measure it to make sure it has at least 3/4". Thanks for the help.
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#4 in the World IHRA Stock
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Re: How much driveshaft clearance to tailhousing?
[Re: Jacob Pitt]
#1345538
12/04/12 12:40 PM
12/04/12 12:40 PM
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Joined: Jan 2004
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Mt. Vernon, Ohio
dartman366
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I Live Here
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Posts: 13,247
Mt. Vernon, Ohio
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Take the driveshaft loose from the rear and see how much further it will slide into the tailshaft housing from where it is now, or measure from the cup to the yoke fully bottomed in the trans, sounds like you should be ok.
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Re: How much driveshaft clearance to tailhousing?
[Re: Jacob Pitt]
#1345540
12/04/12 09:39 PM
12/04/12 09:39 PM
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Joined: Jan 2003
Posts: 6,591
Canton, Ohio
Sport440
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Canton, Ohio
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Quote:
The 2.5" dust boot.
Then you have Plenty of clearence. You stated at rest your yoke does compress the boot a little. So you have just under 2.5" clearence the way I measure. I measure from the yoke bottoming out into the tailshaft housing. With the 1/2" boot I like to see 3/4" to 1" clearence at rest.
IMO, on a race car you want as much yoke engagement as possible without it bottoming out on a launch.
Your just under 2.5" clearence is working for you and has with others. I wouldnt feel the need to get a new shaft. But I do like to see more engaugement then you have for a race car.
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I use half of that as my target length, I.E. 3.0 inches of spline length inside I slide the yoke in all the way and pull it out 1.5 inches for the center to center of the Ujoints on the driveshaft as my desired installed length with the weight of the car on the wheels or on jackstands under the rear axle and under the lower control arms out as far as I can get them to simulate race conditions 
