Hey guys. I have a '94 F-150 and I'm going to be putting a 6" Superlift suspension lift on it. What will the max. tire size be that I will be able to fit under my truck. I know 35's will fit with no problem...anything bigger?

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1994 F-150 XL 4x4
I-6 300ci 91K miles
Auto Transmisson
Standard Cab, Long Bed
3.55 Limited Slip
Rancho RS5000 Shocks
20% Window Tint
Kenwood eXcelon X715 CD Player
Diamond Plated Delta Champion Toolbox
DeeZee Bright-Tread Bedside covers