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Topic Review (Newest First)
11-20-2012 11:33 AM
timothale
drive shaft cut

I have cut a lot using the farmer boy method. First find a drive shaft with no or very small factory balance weights. I lay the shaft on the steel table and use an angle iron next to it to scribe a straight alignment end to end . and spray some paint so you don't put it back together 180* out . I then chuck it in the lathe and make the first cut partially thru the rear, weld bead,, then measure the amount to be cut out and partially make that cut, then with the steady rest accurately adjusted, finish cut the end off, then finish the center cut, put it back to gether then as noted above tack weld, safety hoop.
11-20-2012 12:13 AM
chevota'54 Hay man, my '54 3100 jus blew the 2-3 sprag on a 350 turbo and I switch to a 700r I had, was going thru the same dilama, have a Astro Van out back and wola, the driveshaft fit,problem solved. See Y-all in Daytona for the Turkey Run.
11-14-2012 01:53 PM
BOBCRMAN@aol.com Just today had a request from the business next to me.

They had an "old guy" shorten the shaft for a custom unitbody Ford pickup. They said 67" the guy heard 57". Now they want me to add 10" back into the shaft!!.. I don't think so...
11-14-2012 09:42 AM
superdime yessir im not sure where this shaft came from (a few mysteries left from previous owners) but i know its not an s10 shaft and the slip yoke after pushed into the tranny all the way was still exposed about 2 1/2 inches so i cut an inch off instead of wasting money thanks for your concern tho ss
11-14-2012 08:10 AM
SSedan64 So you cut the Slip Yoke?
Hope you have enough spline engagement on the Output Shaft.
11-13-2012 11:59 AM
superdime 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!!!!!!!
11-12-2012 10:21 AM
NEW INTERIORS 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..
11-12-2012 10:10 AM
cobalt327
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.
11-12-2012 08:56 AM
cliff tate
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
11-11-2012 10:38 PM
superdime 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)
11-11-2012 09:05 PM
prostreet6t9 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.
11-11-2012 09:01 PM
geezer69 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
11-11-2012 07:20 PM
cliff tate
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
11-11-2012 07:00 PM
John long
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.
11-11-2012 06:28 PM
BOBCRMAN@aol.com 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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