Bolt and U bolt size
 

What size are the U bolts, front bolts on the trailing arms on a 64 to 72 chevy truck?

Re: Bolt and U bolt size
 

1310? 1330? 1350? Trans type? Rear end? 1/2 ton? 3/4 ton? 1 ton?

So far all we know is you have trailing arms and hence coils. Not enough to answer.

Honestly getting under there with a dial caliper is probably the most reliable way.

Re: Bolt and U bolt size
 

Don't have 1 to get under or I would. I'm building a trk style susp, just curious what they used. Whichever ones had the largest.