I purchased a Spohn driveshaft and this is what happens!
05-26-2012, 11:17 AM
#41
Not even close to enough. When I got my new yoke, it is a mark williams 32 spline th400 yoke, which is counterbored 1 inch. I called mark williams and questioned how much spline engagement I needed. I was told a minimum of 1.5 x the diameter of the shaft. Roughly 2 inches in this application. Which you might have 2", but I don't think that it would have been into the bushing far enough. Pretty common to have a bad vibration from the ds being too short. The dyno just compounds the problem.
FWIW, I had Jason from TDP rebuild my trans. Couldn't be happier. I went with triple cone synchros and a 32 spline output shaft. All done with shipping was less than $2000. Yours is worse since you have broken parts, but the tailhousing might be usable if you did a larger output shaft, because it needs to be bored out anyway.
Best of luck putting it back together.
Ryan
FWIW, I had Jason from TDP rebuild my trans. Couldn't be happier. I went with triple cone synchros and a 32 spline output shaft. All done with shipping was less than $2000. Yours is worse since you have broken parts, but the tailhousing might be usable if you did a larger output shaft, because it needs to be bored out anyway.
Best of luck putting it back together.
Ryan
05-28-2012, 12:20 PM
#46
While that is possible, that slip yoke was only about 3/4" shorter than the other. There still would have been a good 3+ inches on the output shaft. And a change of 2 or 3 degrees of pinion angle as you come off the throttle isnt going to change the slip yoke travel enough to matter. People lift trucks 6 inches and use stock driveshafts a lot of the time. But I guess anything is possible. If it was the drive shaft I wouldnt put the blame on the slip yoke, but rather on it not being balanced correctly, not tightened to the rear end properly, or a messed up u-joint. Either way, if it has a noticable vibration, dont put it on the dyno. Just asking to break something.
My old ford pickup has an easy 7-8" long slip yoke, obviously there is more room for error in that.....
05-29-2012, 01:59 AM
#47
While that is possible, that slip yoke was only about 3/4" shorter than the other. There still would have been a good 3+ inches on the output shaft. And a change of 2 or 3 degrees of pinion angle as you come off the throttle isnt going to change the slip yoke travel enough to matter.
The weak link in the 27 spline mainshaft is the grooves for the VSS reluctor retaining rings. One without those could take a fair amount more power.
That said, a 32 spline triple/double cone T56 is a wise move.
05-29-2012, 06:19 PM
#48
What really matters here is the yoke remaining in the bushing at max chassis travel.
The weak link in the 27 spline mainshaft is the grooves for the VSS reluctor retaining rings. One without those could take a fair amount more power.
That said, a 32 spline triple/double cone T56 is a wise move.
The weak link in the 27 spline mainshaft is the grooves for the VSS reluctor retaining rings. One without those could take a fair amount more power.
That said, a 32 spline triple/double cone T56 is a wise move.
thanks
05-29-2012, 06:24 PM
#49
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A nine inch really needs a one inch longer driveshaft that what a 10 bolt and 12 bolt requires. Check out the x dimension on the diagram at this link. http://shop.brutespeed.com/PST-DRA35...-PST-DRA35.htm
45.25 is the dimension we use for 9" rears. Bob
45.25 is the dimension we use for 9" rears. Bob
05-30-2012, 05:40 PM
#50
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I'm running a Strange 3" chromoly driveshaft spec'd out by Midwest Chassis & Performance. They send the specs to Strange, and Strange builds it. MWC say this is the exact shaft they use for all Fbody stock trans to 9" builds. The thing is, everyone says they need a 1" longer driveshaft to make it work, but here is a pic next to a stock steel driveshaft from an Fbody. The shaft part is the same length, with a slightly longer yoke. And the pic with the engagement of the yoke into the shaft seems to be fine. Either way, it's running like a champ.
05-30-2012, 05:55 PM
#51
Maybe the longer yoke makes up for it. Not that I like that as a solution, but if it is working for you, that is good. My issue would be if u ever needed to upgrade to a chromoly yoke and can't get a long one, then what? Looking at the picture of the slip in the trans: if that is at ride height, you are probably fine because of the long yoke, but the shaft could be another 1/4 - 1/2 inch longer and still be good.
Im also not sure if MWC might fabricate their housings so that a stock driveshaft works, where moser doesn't. Unsure, I never used a MWC rear.
Im also not sure if MWC might fabricate their housings so that a stock driveshaft works, where moser doesn't. Unsure, I never used a MWC rear.
05-30-2012, 09:36 PM
#53
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Maybe the longer yoke makes up for it. Not that I like that as a solution, but if it is working for you, that is good. My issue would be if u ever needed to upgrade to a chromoly yoke and can't get a long one, then what? Looking at the picture of the slip in the trans: if that is at ride height, you are probably fine because of the long yoke, but the shaft could be another 1/4 - 1/2 inch longer and still be good.
Im also not sure if MWC might fabricate their housings so that a stock driveshaft works, where moser doesn't. Unsure, I never used a MWC rear.
Im also not sure if MWC might fabricate their housings so that a stock driveshaft works, where moser doesn't. Unsure, I never used a MWC rear.
Well, all 9"s typically come stock with the "standard" (short) yoke, so any 9" with a standard yoke will be the same. They have a long yoke used in certain Ford vehicles, but most aftermarket 9" rears come stock with the standard shorter yoke.
Also, from what I've read, you should always make up the length within the driveshaft tube, not the yoke. This pic was taken on a drive on lift, so it's ride height, suspension all loaded.
If I ever need to upgrade the yoke, I bet all Strange yokes are the same lengths. I can't remember if this was a Strange or a Spicer yoke though
Also, I've been told that Spohn's shafts are really made by Strange, I can't really confirm that honestly, just something I heard.
Last edited by HoLLo; 05-30-2012 at 09:43 PM.
05-30-2012, 09:56 PM
#55
If I order a stock length driveshaft from the sites they sell through I expect a stock length driveshaft! I never asked them to send me what "they" considered STOCK LENGTH. They state it's balanced and ready to bolt on. They never stipulated to measure anyway before ordering. Remember I'm just an average joe that is not too familiar with drivetrain parts. You get my drift, I never had a doubt it might not have been the wrong one, I ordered confirmed the part number on their website and tried to run with it! But it was an epic fail.
06-05-2012, 08:07 AM
#57
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If I order a stock length driveshaft from the sites they sell through I expect a stock length driveshaft! I never asked them to send me what "they" considered STOCK LENGTH. They state it's balanced and ready to bolt on. They never stipulated to measure anyway before ordering. Remember I'm just an average joe that is not too familiar with drivetrain parts. You get my drift, I never had a doubt it might not have been the wrong one, I ordered confirmed the part number on their website and tried to run with it! But it was an epic fail.
06-05-2012, 08:43 AM
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oohh.......now i understand. in that instance, you need to whack someone over the head with it, unless they give you excellent service fixing this problem.