911!!! Driveline issues 93 ford f150 2 peace

Hey guys. Iv got a 93 ford f150 with a 2 peace drive line.
I was on my way to Fargo ND last Saturday to bring my brother home for xmass…
Im in oklahoma.
When I got to Ks city KS I noticed a vibration when on the gas but went away when I lifted of the gas.
I kept thinking It was the rear getting readdy to let go.

I pull off of hwy 470 at ext 2L (If anyone knows this area they know the BIG HILL WITH 4 lanes of traffic that is one way)

I came to a stop – merged over and BOOM clank bang – and oshit down the hill backwards on snow and ice I went. I some how drove back wards down this hill with out hitting anything on snow and ice…
I guess because of the big hill and all the snow and ice the truck did not wanna stop with the breaks. I just kept sliding.

After I got in some what of a safe spot and stopped (Steal blocking 4 lanes of traffic) I got under the truck to find the rear end yoke and drive shaft had snapped.
The rearend yoke was trashed and the unjoints in the driveline wear trashed….

I got a tow truck to tow me a few miles to a orailys…. New issue!!! The parts store is closed!! its 1045pm at night. and they dont open again until 9 tomorrow.

I sat in 18 degree weather all night. The next morning the part stores open and I find out they dont have the parts I need. (DEALER items) BUT they inform me of a pull apart down the road thats open on sundays (THANK GOD)

SHORT STORY.
AFTER 20miles of walking in snow and ice I get back to my truck and install the new driveline.

So far the drive line has held up but I have a bad vibration between 30 – 40.
I dont notice the issue at 80 just between 30 – 40. It feel like a jake brake in a 18 wheeler.
on a scale of 1 to 10 between 30 and 40 its a 10 after 40 its a 0. What gets me is – You would think the issue would be worse at higher speeds!!!

I was told these drive lines have got to be lined up with the front drive line a certain way to help with balancing.

At first the issue was between 30 – 35 and I relined the drive line with the ujoints now the issue is between 30 -40 ishs….

Can some one tell me how to line up these two drive lines???

Thanks!!!