1992 s10 blazer

[woodwork]

When my 4x4 is engaged in 4 hi the light that tell you its on goes out every time i touch the gas pedal when going above 30 mph sometimes it feels like it not engaged above 30 mph it just seems to have less traction than it use to have just wondering if this means the 4x4 system is on its way out 185000 miles on truck