Theres been many threads on this. Some say its normal and some say its something to do with the tranny or rear end. Check out some of the links listed under "similar threads" on the bottom of this page. Mine truck does this, but only if i shift from P>R or R>P pretty fast (gated shifter) If i do it slowly it doesnt do it.
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04 King Cab LE 4x2
Dueler Revo At's, 17" MB Razor's, AEM Brute Force CAI , Billet Grille, NCD 2.5 inch leveling kit
It's normal to hear a clunk if you switch quickly from drive to reverse or reverse to drive. I heard brand new Titans do it at the dealer. I pause in neutral for one second between shifting and no clunk.
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05 KC SE 4x2 FFV, smoke, no big tow. Mods: Bully Dog Power Pup, JBA catback, S&B GEN 3 CAI, Hellwig HD traction springs, Nasta nerf bars, Kenwood KSC-SW1 powered sub, Grilleguy lower bumper insert, Autoenginuity/enhanced Nissan software, best 1/4 mile time of 14.660@93.14 MPH running BD reg 87 tune +2 timing and DA@1830'. JBA catback soundclip, just some revs: http://www.vimeo.com/634077
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