i need help!

[SanitysBane]

hey, i have a number of problems with the truck and im at a dead end, so here goes.
1) my fuel gage is messed up, it only goes up to about 3/8ths of a tank, i took out a sending unit, turned it upside and left it there for 2 hours and it still only 3/8ths, im also not shure how many ohms should be in the sending unit, other than that the sending unit looks fine but i need a new sock for it. Will i need to by a whole new sending unit or can i just get a new sock? the sock looks to be welded to the tube

2) i installed an alternator off of my brothers 88 truck and used a kit to wire it into the 83. but now the gage only goes up to 12 volts, but some times it will be on 8 and ill check it at the battery and it will show 12 volts with our volt-ohm meter, and also when ever i use the turn signal the gauge pulses to the turn signal

3) my driver side door window regulator is shot, i tryed to get the window out and couldn't so now its just stuck, also i can get a new door from a junk yard for $60 and thats alot cheeper than the 100plus that lmc wants for just a regulator, so which way would be the best? also im not shure if i want to get eletric windows on it, im shaving the door handles so i don't care about locks

4) the frame is straight as far as i can tell but the passinger front sits about 1/2 lower than the driver front

5) how much work is it to put on a shackle and hanger kit on an 83 longbo

6)should i jsut say screw it and by a new project truck for under 2 grand and put my drive train in it?

thanks

p.s. i finally got that thing running again!! the 88 700R4 i had in it fried the clutches and so i rebuilt a 92 one out of a Camero but i reused the TQ out of the one that i fired the clutches(the oil looked like aluminum spray paint) so after pulling off the valve body, getting a new one on and then replacing the filter im good to go for another 100 or so miles then im chaning the filter again, hopefully that will get all the crap out of the oil