OK
I have a 4.8 4x4 std cab long bed(mods in sig)..I also have a heavy a$$ hitch that i use for farm use..that wieghs about 300lbs

2.2 60ft
6.5 330ft
10.1 1/8
68.8mph

15.78 1/4
85.50

I dont know if this is good or bad..or just par for a 4.8 4x4

I also ran the g-tech at the same time,,it was 3ths slow and 2mph fast

yeah I know its SLOW..so dont make fun...

 

For comparison my stock 2WD 2002 ECSB Silverado ran:
16.441 et
86.68 mph

 

same here....

 

I don't know what my 00 Z71 RCSB 5.3 turns in the 1/4
but if mine ran 15.78 I would be very happy.
Will find out when I take to track.




00 Sierra Z71 RCSB 5.3 4:10's Dynomax catback, Hypertech PIII, Airaid and K&N, 160 therm.