i may be wrong but it think the 04 SSR had the 5.3 and the 05-06 had the LS2. U could also get a 6 spd on the 05/06 while the 04 all had autos. I shopped these a few years back, but its been a while.
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69 RS LS3/T56
68 firebird vert LS1/4L60E
67 RS LS2/T56
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