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The TT series are affordable converters while the SC series are machined from a chunk of steel billet and are designed to stall behind the huge torque a SuperCharger will produce. A TT3000 would probably stall to 4000 behind my engine
The SC series also run in the $945 range
2005 SIERRA firstname.lastname@example.org THE SILVER BULLET
My other ride is a '91 Electraglide custom.
If your 4.8 is stock and running around 6 psi of boost the TT3000 should work for you. If you plan to increase power in the future I'd say get the SC series. I don't know much about the Vigilante but have heard nothing but good things about them.
A friend of mine has a '00 GMC ECSB with 6.0L with STS Kit. It is all stock with the exception of camshaft and different pistons. He is running a TT2600 and it works well for him although he does wish he went with the 3000 instead.
2005 Silverado 1500 Crew Cab
5.3L, 3.73, G80
Volant CAI, 3" AeroChamber, HPT, Yank TT2600, ASP Underdrive Pulley
14.925 @ 90.69mph - Predator programmer, DA - 2300 ft