The transmission in mine was the M5OD (manual 5 speed) so if you are using that transmission, what you can do is go to the wreckers and find an extended cab with the same transmission but uses a two piece drive-shaft...You can use the whole thing up to the back connector to the rear end, usually, but you will probably need to change the back connector on the drive shaft to match the rear end...
That's if you can find one with the same transmission...the big thing here is there are many variations of the drive shaft with connectors and splines that look like they fit...but don't actually work...
You may need to measure and count the ribs on the transmission end of the shaft to make sure you get one that fits the back end of the tranny...and then measure the length to the rear end (they should just work because there was no variation in the wheel base in most cases) just to make sure...
Once you have a two piece shaft you will then need to match the connector that bolts onto the rear end.
NOTE: I found only a single one-piece shaft for this, but it was either broken or wouldn't fit my tranny (not sure...can't remember) so they are out there if you look...maybe one from an F-150 might work but you will probably need to weld both the spline for the transmission and the connector for the rear end to fit your truck. Best to use the two-piece because there is a yoke mount that sits just behind the transmission on a cross-member that helps keep things in line.
Because the rear end mount/connectors can vary between years and rear ends it is best to simply cut the one off the current driveshaft that connects to your current rear end and get it welded onto the end of the new two-piece shaft...
Another option would be to simply swap in the rear end of a later model and just use the entire two piece drive shaft from one that has the same transmission as your current transmission...
Hope that all makes sense because it had me scratching my head and making extra trips all over the place to get it right...and if you don't know how to weld it yourself try to find a shop that knows how to weld drive-shafts...if the cut is off even slightly and the shaft is not straight you're in for a rough ride...as I'm sure you can appreciate...