Thanks for the info Jeff.

 

I have a superchip on mine and experienced a similar problem. At about 90-95 it felt like in hit a speed limiter. I sent the chip back and they fixed the problem now it pulls hard through 130.

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99 Black Lightning
superchip
airaid
dual flowmaster exhaust
ARE Truck lid
Lund Headlight/Tail light blackouts
G-tech Pro
373 rwhp
0-60: 4.7 sec
1/4: 13.2 @ 108 mph
'00 Yukon XL
'95 Mercedes sl320

 

Thanks Lightning 99.

Looks like I'll be sending my chip back soon.