u bolt size

[Senditguy69]

Hey guys new to the forum I’m building a 1984 Chevy k10 I’m swapping out the rear leaf springs with k20 leaf springs with 4 in blocks I’m wondering what width and length u bolts I need. Thanks in advance

 

[Jethro224]

Same width as the ones you have now +4" for the blocks + however much thicker your K20 spring packs are compared to your originals.

 

[bucket]

The axle tubes are 3" or 3 1/8", I don't remember which.