12 bolt being added to our 63
 

At another time in a Land far, far away I began collecting parts for a Hot rod truck build, one of those parts is a 12 bolt rear it has two eye on either side of the Differential I figure are for a factory four link. Our 63 has trailing arms with coil springs, can I, should I use both? thanks in advance this is new for me

Re: 12 bolt being added to our 63
 

You can't use both.
Either weld the truck style trailing arm mounts to that rear end or convert your truck to use 4 link like the car the axle came out of.

If there is a problem with your current rear end probably easiest to find a newer trailing arm rear end and swap.

Re: 12 bolt being added to our 63
 

thanks very much for help

Re: 12 bolt being added to our 63
 

Another item to consider... The wheel bolt patterns are vastly different..

Re: 12 bolt being added to our 63
 

Thanks I have swapped out my front cross member to an 83 C10, I will check the 12 bolt to be sure they match Good point indeed !

Re: 12 bolt being added to our 63
 

If that 12 bolt is from a passenger car, the bolt pattern is different.. Passenger car is 4.5X5, while 71 up C/10s are 5X5.. Pre '71 is 5X6...

leegreen offered the very best advice/solution.. Locate a good '71, '72 coil spring rear assembly.. It's a unbolt - bolt up project. Plus the wheel bolt pattern matches what you have on the front.

Re: 12 bolt being added to our 63
 

Passenger car 12bolt is 5x4.75 pattern.

Trucks were 6x5.5 or 5x5.0 depending on the year model.

71-72 12bolt 5x5 pattern rear ends are wider vs what was under a '63 so there are slight differences in back space requirements on wheels depending on final ride height.