1 piece driveline
 

I am working on a 69 swb 2wd with coil rear,if I switch to a 1 piece driveline will I need to cut the hole in the crossmember larger?

No....
 

you should however, remove the carrier bearing bracket.

And if you have a TH350 with the short shaft tail on it, then 4 foot and 10 inches should be what you need.

Just noticed you are a new member...welcome to the board from frigid central Ohio.

Welcome to the 67-72Chevy boards.

Welcome to the board !!!!! Andy it thet a custom built shaft or is it outta some production car??? Was wondering why it neck's down on the tail end before the joint???

Alot of One peice driveshafts are like that

I run a th 350 Longtail and i use a driveshaft out of a 2 door chevelle

I had asumed it was original honestly...but with the miles this sucker has, there is no tellin.
I tell them I want U-joints for a 69 GMC and they give me the right ones.

Welcome from Missouri :bowtie:

If its a half ton You will want brand and part number PDQ-0153 that will get you somewhere most places sell Pdq brand stuff or have a book to cross it over as long as you get outside locks that will be the joint you will need If you want extreme Use U Joint Get a brute force p/n Bf-0153 now if you get a newer style driveshaft you will need inside locks In wich case i dont know the part numder but i can get it .

Welcome to the board from South Mississippi!