Would like to put RF600a-4 under the passenger seat but dont know if their is enough depth. What sizes do youall have installed. I have a 99 lightning and this is the only place to olace a amp. Thanks for the help size of RF600 is 10 3/4W -2 11/16 H- 9 11/16 D

 

That amp should easily fit under there provided Lightning is the same as regular cab.
I had to put mine under there too.
Both amps fit under the seat so 1 should be no problem

 

I think if I remember right that is a little bit bigger amp than normal...I can't say for sure though. It SHOULD fit...I had a RF 60.2 mounted under a seat...and yours is about double that..depth wise should not be a problem at all.

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98 XLT, 4.6L V8, Reg. Cab, S/S, Dark tinted windows, Ranch Hard Tonneau Cover, Better Built Bed Rails, Lund Lunar Visor, Smitty Bilt Sure Step Bars, Headlight/Tailight Covers, Deflecta-shield window guards and bug shield, Duraliner Bed Liner, Pioneer Premier P98R CD player, Kicker Resolution 5.2 component set in front, 2 12" Kicker Solobaric Subs, 2 Kicker ZR240's for subs, Kicker ZX460 for components and rear, Alumapro 15 farad the CAP