TSB is the suffix and it is a truck engine because it starts with a T. the T0907 works as T= Tonawanda build plant 09=september,07 =7th day. that other number is most likely the the seuence number of the truck it came from mening the last digits of the VIN.DAVE
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"been there, done that, ruined the T-shirt".
2007 LBZ GMC Sierra, ECSB
2006 LM7 RCSB Silverado
98 Vortec project.
94,3500,6.5L 4L80
81 SWB GMC POS finally gone 
73 Pinto, stock, w/CragarSS's-eww 
84,C10 SWB-Yella,stock
86 K10 SWB-Red, hopped up 305,4/S
LOTS of Cummins trucks.
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