Hi Mate,
I am running a Savox 1258 in both my Dex210 and Dex410 with no issues at all.
I run a 1256 in my Dex408 1/8th scale.
I used to run the 7.4v Savox servos in my 1/8th Nitro and once i sold it my mate ran the servo in his 2wd at 6v.
I think the only difference is the spec is less at 6v than 7.4v
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