hello , i have heard you should not change the front end axle and steering , i have not been able to find that information online . i have a 1939 chevy 1.5 ton truck ,i just had the front axle rebuilt i would like to know if i can raise the front end 4 inches and where to find the information for cosmetic and performance issues mainly cosmetics . is there a limit of how high ? thank you 1pete1