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Old 11-11-2012, 04:55 PM
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shortening my own driveshaft

ok guys so here is a dumb question i wanna shorten my driveshaft tomorrow at work but i dont have a dial indicator i can get one but it wont be tomorrow so the question is can i eyeball the runout or do i absolutely need a dial indicator to do this thanks in advance please only answer if you have expirience i dont want a persons guess to cause me problems as i have a limited budget and even less time id like to do it right the first time but this is my only vehicle and its been down for way too long already so quickness in execution is the key here if its too risky ill have to wait for the tool but would rather do it tomorrow i am a good welder/metal worker just need to know how improtant the dial indicator is

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Old 11-11-2012, 05:13 PM
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I only tried it once and it didn't work out so I took it to my local machine shop and got it fixed. I watched while he did it and it looked like the dial caliper is probably critical to doing the job right. Only cost me $50 too, so not cost prohibitive.
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Old 11-11-2012, 05:26 PM
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I have done two myself. Both using a dial indicator, and both with no vibes. I would not even try without the dial indicator.
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Old 11-11-2012, 05:59 PM
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Actually taking a caliper or straight edge that you can supported in a fixed position and slide it to the shaft as it turns will indicate if you have run out. It just won't tell you how much. Even a dial indicator is not of value if you can't chuck up the assembly and turn it.

John L
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Old 11-11-2012, 06:01 PM
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one thing i would just point out: it may be easy to cut/weld out in the middle of the shaft, but if it is off a tenth of a degree in the middle that will make much more viberation than being a tenth a degree off near the end.
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Old 11-11-2012, 06:28 PM
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You didn't state how or on what kind of machine you were going to use.

I have done driveshaft shortening for many years. Tho I always use some kind of runout indicator. It could be done in a lathe with a good eye and a three post steady rest.

Always shorten the end going to the rear. If you use a large lathe. Mark a line the length of the shaft for index purposes. Chuck up the yoke end in the headstock and use the steady rest tight on the shaft, to be cut end. cut the weld thru on the shaft and gently tap the end off the shaft.

Carefully trim shaft to length, try not to move any lathe settings. After cut, line up the marked line, tap end back into shaft. If the cuts were true. The ends will fit perfectly. Check for visual runout. Tack weld with a Mig in three places. Check again then weld up the shaft.
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Old 11-11-2012, 07:00 PM
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Quote:
Originally Posted by BOBCRMAN@aol.com View Post
You didn't state how or on what kind of machine you were going to use.

I have done driveshaft shortening for many years. Tho I always use some kind of runout indicator. It could be done in a lathe with a good eye and a three post steady rest.

Always shorten the end going to the rear. If you use a large lathe. Mark a line the length of the shaft for index purposes. Chuck up the yoke end in the headstock and use the steady rest tight on the shaft, to be cut end. cut the weld thru on the shaft and gently tap the end off the shaft.

Carefully trim shaft to length, try not to move any lathe settings. After cut, line up the marked line, tap end back into shaft. If the cuts were true. The ends will fit perfectly. Check for visual runout. Tack weld with a Mig in three places. Check again then weld up the shaft.
Good clear explanation from Bob. I have seen my local drive line shop correct a slight run out in the tube by heating the "high" side of the tube with an acetylene torch about the size of a dime. By shrinking the high side it will pull the tube straight. This method only applies to run out in the middle of a tube. There is no fix for sloppy work at the ends.

I have been told that the center of the tube will get warm after a high speed run, if it is not true, due to the flexing. I wonder if Bob knows if this is correct.
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Old 11-11-2012, 07:20 PM
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shorten drive shaft

it can be done,machine off 1end clean up the yoke that the u joint goes into.you then need a long flat surface,lay the drive shaft on the floor or flat plate,this whay you get the u joint circles lined up,this must be right on.when you are there tack weld the shaft to the yoke in 4corners. install on the vehicle withe the rear wheels up and in nuetral.rotate the drive shaft you mah have to wack it with heavey hamer check the runout with ablock of wood with a piece of round stock.when you ar close weld it in place,just small amout at a time,weld a heaveyer amount to keep it streight. when finished you can st it further with torch and cold wate.heat a small spot then cool with wet rag.the shaftvwill pull to the side heated nd cooled.have worked for me on 2 ocasions. cliff
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Old 11-11-2012, 09:01 PM
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ive cut em. i dont do much engine work but its just metal. you can do it with bout any thing. you got to get a good mark on it. i use a scratch all. a sharp one. hahaha. even a good pipe wrap will work to get close enough.a good square will after your first cut but you got know how to use them tools well.you can cut it with a dang sawsall near the mark and finish with some carefull grindin. but you got to get that mark rite. check it ever way you can. i'll proly get a lesson here from someone but i ben workin metal, steel all my dang life. not cars but its the same dang thing.im buildin a car.my first one. aint done nothin in a while but i asked a few questions on here and cut that sucker up and its together.i used my carpenter tools. hahaha
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Old 11-11-2012, 09:05 PM
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Before you worry about removing any runout in the tube.. Focus on getting the tube yoke in the tube straight. And DO NOT butt weld!! You will have the best luck if the tube yoke is no more than .05 difference measured 180 degree from each other.

After your tube yoke is welded in straight then worry about removing runout in the tube.
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Old 11-11-2012, 10:38 PM
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thanks everyone ill probably just get a dial indicator or if i get adventurous ill try the straight edge thing and hack it up tomorrow I will let ya'll know how it turns out (no pun intended)
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Old 11-12-2012, 08:56 AM
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drive shaft

Quote:
Originally Posted by superdime View Post
thanks everyone ill probably just get a dial indicator or if i get adventurous ill try the straight edge thing and hack it up tomorrow I will let ya'll know how it turns out (no pun intended)
take the shaft to a machine shop and have the yoke removed properly,it has a aria that fits snugley into the tube,if you are dum enough to think you can cut the shaft in the midel ane ever get the shaft to work properly,think again .Iwas that dum 1 time,learn from us old dudes. cliff
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Old 11-12-2012, 10:10 AM
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Quote:
Originally Posted by superdime View Post
thanks everyone ill probably just get a dial indicator or if i get adventurous ill try the straight edge thing and hack it up tomorrow I will let ya'll know how it turns out (no pun intended)
If you go ahead w/this, before taking the car out on the street install a driveshaft loop. Cheap insurance and I would say that even if I welded it. A loop should be on every performance vehicle anyway, IMHO.

And you should have it balanced. You might be able to use the hose clamp trick if it's not too far out.
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Old 11-12-2012, 10:21 AM
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Make sure your yoke's are lined up right,, AWAYS make you cut and weld's at the ends.. Never try to do it in the middle.. You will never get it right..
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Old 11-13-2012, 11:59 AM
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by the way guys i was talking about cutting off the yoke NOT in the middle and i did build my own driveshaft loop awhile ago nows the perfect opportunity to utilize the s.o.b. and just an update i ended up not shortening the shaft the way i planned and i cut the splined shaft (OMG!!!!!!!!ya i know) im cheap and when i get the funds im getting a chromolly shaft anyway so this one only needs to get me to work and back for a few months (tax time is my christmas) but if i were to do it myself like i was asking i've decided the dial indicator is a must as is a lathe im sure i could check runout on the vehicle with a dial indicator but with the speed and power soon to be in the truck i'm not too sure i would even want to take it down the strip so many thanks guys for your kind words of encouragement and advice but for now i got it sorted out........Happy Rodding!!!!!!!
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