Dear Welder Series…
I have a 1951 Chevrolet truck 1/2 ton putting a 2002 Chevy S10 4×4 Blazer 8.5 ring gear rear w/disc brakes in. I want to use the 4 link system, which one of yours will work easiest and best?
Both kits do a good job of locating the rear end, holding it in place, and letting the suspension work.
The triangulated kit costs less than the parallel kit because a Panhard bar is not required.
The parallel kit does require a Panhard kit (about $100.00). The parallel kit is easier to adjust for squaring the rear axle to the frame center line, and centering the frame left-to-right.
The Panhard bar does move the frame left-to-right as the frame goes up and down, but if a straight Panhard bar is installed level, this amount is insignificant (about 1/8″ with a 19″ bar) for normal suspension travel.
I hope this helps you decide. Thanks for looking at Welder Series parts.