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So I started in building a T2 that I got "NIB". It is, in fact, mostly NIB, except for the rear shocks. Looks like someone took the original rear shock parts out, and dropped in a set of pretty well used ones.

Not a huge deal, as I'm planning on running it. BUT, in looking at the rears, the springs, cups, etc... are much larger diameter - Everything seems to fit, but they are clearly bigger than the ones shown in the instructions.

What's the deal, does anyone know what these are off of? Also, any downside to using large diameter in the back, smaller in the front?

I either need to figure that out so I can get different springs, or track down original parts to convert back.

they could be a number of different manufacturers, but are probably losi or traxxas, both have larger spring diameters than associated.

if the spring rates are close to right for your truck, there is no real issue running different spring diameters. just personal preference.