I always get a steel ruler and put 3 punch Mark's in a row from the yoke down the tube. Then cut out the waste tube and bang back together with the 3 punch Mark's lined up using the ruler again. The main reason is I know it's back exactly where factory balanced it.
You demonstrated why I cut mine off at the rear yoke, when joining it together again the slip yoke isn't in the way. Beautiful job, and Z good video for young car nuts to show them you don't have to have a new drive shaft made.
So you are supposed to get the high spots out before welding it? I may have messed up then. I am working on my driveshaft right now. I cut it down, put the yoke back in and phased the yokes then welded it up. I thought you got the high spots out after welding it together. Crap!!!
WOW!! Great job One observation, how about a shield on the grinder. I'd hate to have that disc disintegrate on your face. That would be a real ouch, and will put a real damper on your progress. Also, how far is the yoke sticking out of the tail shaft. Looks a little much. Shouldn't be anymore then 3/4 to 1 inch. That could be the reason for some of your out of roundness.
I have no guard on my 4 1/5” angle grinder, but wear welding gloves. I never have my head, face in the plane of the grinding/cutting wheel. Just had 3” of a worn cutter come apart at full speed last week. Glad I had the long gauntlet on the welding gloves. It stung a little but did not leave a mark. I watch a video from some guy overseas in who knows where, fabricate some metal into a useful shop tool that required all kinds of welding. He wore shorts and flip-flops the entire build. That scares me. I was under a 4 ton disc welding gussets with an arc welder in the early 70’s. It left 3 burn marks in my arm pit on the right, 4 on the right. I still get asked by a doctor/nurse every time I am getting a shot. The one they couldn’t see, burn’t thru my tennis shoe and landed between my big toe web and toe #2. That hurt as I wiggles out from under the disc and found the only mud hole with water in it in the barn yard. I was about 13 when that happened an never did another. ASE Master Tech since 1978.
Your method isn’t bad but people should be real careful re welding stock Chevy and dodge inside clip u joints. The extra heat from welding them back in messes with the nylon injection that holds the caps in. This works well at the race track in a pinch but I would have it balanced either way.
