hey red on allens post were he blew his he showed his plug and it had metal around it id say if it wasnt anywere near that than i would put it in if so then dont chance it .just about any used tranny ive ever seen has some metal on the plug,no chunks or heavy residue id go for it ,like u said it has 90 days ,but i understand the principal tho.but i ll bet u got it down by now tho ,as far as putting them in,lol.youre sticking your neck out eith any junkyard tranny .youre gonna hear all negative things but also consider the obvious.**** even trannys 1 month old have residue on the plug from breakin.if it smells good do it always my moddo.lol get it .
mods:2004 sierra ext sb,20s ,big brake kit w,hawk pads,air bagged,2006 6.0 lq4 swap,vortec supercharged10psi, air to water intercooled w/ dual electric fans on it ,snow meth injection kit,60lbers, e-fans ,big radiator swap ,cam 218 /222 548/550 comp .hardened prs .1.85 comp roller rockers ,guideplates ,crane double springs,trans 4l65e built .pacesetter l/ts true duals w/x pipe and magnaflows,14 bolt rearend swap ,3.73s,aroemotive fuel pump system w/elec.fuel controller and bypass regulator a/n fittings, taylor 10.5s interceptor gauge,aem w/b a/f ,autometer boost/vac NELSON 93 OCTANE TUNED .