1980 GFL Stood for Graphite Fly Rod. Used alone and in conjunction with other model names for years. Not really considered a model name.
1982 RP Reserve Power for long Casts Graphite II
1982 LL Traditional Action 2-5 Weight (LL=Light line) Graphite II
1983 MA Medium Action Entry level unsanded grey rod with simple hardware
1985 RPL or Graphite III RPL Reserve Performance Light
1985 LL Graphite III LL
1986 RPLX Saltwater 8-12 Weight
1986 DS Discovery Series - Moderate Action Replaced the RP
1986 TH? Double Handed ?
1994 SP Generation IV Graphite with Durascrim
1995 SP+ Generation IV Graphite with Durascrim
1995 RPL+ Faster than the RPL. Would be considered moderately fast by todays standards
1997 VPS Replacement for the RPL Back to Gen III
1997 VPSL Replacement for the LL Gen III with lesser components
1997 SPL "Best of show" new rods*Gen III
1997 RPLxi Revised and improved saltwater*Gen III
1998 DS2 Lower Price point Graphite II or Graphite III Not even close to sure about the year
1999 XP Lighter narrower tapered Fast Action Gen IIIe
2002 SLT Medium Fast Action Gen IIIe
2002 TCR Ultra fast action for experianced Casters
2003 LE Entry Price Point Rod
2004 Xi2 New Saltwater rod was first with new generation 5 (G5) Technology
2005 TXL Near weightless for light lines G5
2005 Fli Entry Level Fast Action taper with maximum power transfer G5
2005 Launch Entry Level smoth progressive power curve and very high strength to weight ratio*G5
2006 VT2 Mid price point upgrade to long running VPS
2007 Z-Axis Ultimate Fast Action Rod coupled with trmendous feel (2 piece, 4 piece, Spey and Switch
2008 BASS Finally released after years of development and even showed up on magazine covers with Snook, Baby Tarpon and Pike
2008 ZXL Medum action Cousin to the Z-Axis in weights 3-6
2009 TCX Replacement for TCR but fitting a wider range of castins styles (kryptonite green)
Current ONE Flagship "all-around" rod Fast Action
Current VXP Ultra high speed line and slender shaft begginer to experianced
Current Flight Great features and a great price
Current Vantage Medium Fast value rod
Current TXL-F Light Line Ultra lightweight
Current ZXL Easy and Relaxed like the classic action rods
Current Xi3 Salt Water Replacement for Xi2
Current 99 Nymph angler 9'9" with unique taper to make open loops
Current BASS II Upgrraded for faster line speeds for big flies still good for Bass, Snook, or Tarpon, Pike and Musky
Current ESN Designed for european lirect line nymphing with multimple flies