Just to add I took Gatbr advise and bought my brother the Casper Electronics throttle enhancer for his 96 yukon, this thing really does work.
Truck shifts alot nicer in WOT and downshifts ALOT quicker then it did before
Highly recommend it 
00 Silverado Z71 LT EXT Wester's 93, Dynomax, Poweraid, K&N, LS1 fans, Corvette Servo, Trans-go
96 Yukon 4 x 4, 4dr, SLT Wester's 93, UPD, MSD, Magnaflow, Casper's, LT1 fans, Corvette Servo, Trans-go **S O L D**
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