Front lifting slow

What could be makong the front lift so slow? Its an 1991 s 10 x cab with 1/2" line and 2 viair 450 and a 5 and 6 gallon tanks. Besides the weight of the motor what could it be. Thanks Ryan

where do you have the front valves mounted at?

how many valves /and psi

had the same problem with a friends 92 x-cab with 4.3. was told (dont know how true but only explaination i could get) that it has to do with th geometry of the control arms. well that and wrong size cups. never found out what it was, friend got tired of truck and sold it. would like to know since i bought the truck. but i do plan to do custom frame and arms so not gonna be a problem.

Valves are under the front doors 8 valves total. Its like there is not enuff air to lift it. The back air right up but not the front. Not sure on psi

might be the psi if u aint sure

The front gauage was leaking so i bypassed that.The back gauage reads like 180 psi

180 should be plenty to lift the front.. do u have a kinked line? and maybe you just need a charge tank ?

I'll check the lines. What is a charge tank i'm new to this stuff.

I HAVE A 95 S DIME AND THE ONLY THING THAT HOLDS IT UP IS THE UPPER BAG CUPS JUST CUT THEM DOWN AND U WILL BE LAYN IN NO TIME BRO