Is there really a difference between the rear bars for a 2-dr or 4-dr Blazer, and/or 2wd or 4wd? This way when I'm out junkyarding I know what to pull. Also, would the Blazer bar be a better choice compared to the F-body bar? I could see the F-body bar probably being thicker, or heavier.
2dr blazer points backwards and sits on the top of the axle, putting it on a G body moves it under the diff and points forward. A 4dr has the fuel tank in the spot behind the axle and the swaybar sits in a spot that doesn't work on a G body.
A 3rd gen is good and fits BUT you have to heat and bend the ends inward since they flare out a few inches at the ends.
You have to be careful in choosing a rear bar. A rear bar that is too strong can upset the handling of your car. The reason I tracked down the GTA rear bar is that I had the GTA bar up front so the two were designed to work together.
Think it's to take the stress off the lower arms & give the ends a more solid point to mount to. For the DD's that just cruise it shouldn't make a difference as much going with either type. But for the guys who wants to make it ride on rails it might be more helpful than the stock type.