Not worth the cost for such a small change. The 3V isn't going to love the upper range like the Coyote so, going steeper won't really aid you much. 3.55's a perfect street gear.
Doing rear gear setups on anything 8.8 right is tricky. Easy enough assembly but, getting it set up right to run quiet first try is not for the faint-hearted or inexperienced.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto N/A tune. 100 shot nitrous on BBR tune. Best e/t 11.42 at 120.64
2012 Premium GT, Candy Red, Brembo package, 3.73, MT82, Comfort, Tech, et al. Procal tune, Roush UCA, UMI poly LCA, GT500s, Steeda red bracket, Hoosier 28x10x16 bias drags. Best e/t 11.91 at 115.23 RIP