dana or 8 3/4 narrowing

One trick to help against warping is make marks around the tube on either end to space out your welds to evenly distribute the heat soak.

What I do is mark (on both ends of the housing) a 1 on top, then a 2 on bottom, then a 3 in front, then 4 in back, then go 5-8 between those and always opposite the previous one. And I let it cool a little between...like I'll do both 1's and both 2's, then go work on something else for 10 mins, then both 3's and 4's, then let it cool again, then 5-6, then 7-8. And I do a very narrow land and root/fill/cap...so I'm doing this routine 3 different times. Haven't had any significant movement of the tubes yet.

Oh and when you use an alignment bar, use the end pucks to align it for tacking, then pull them out. If you leave them in while fully welding, they'll be a huge PITA to get out again if there's even a little bit of warpage. Just slide them in at the end to see if you need to adjust.