A failing pump will deliver reduced line pressure, which in turn will cause the clutches to slip. The slipping builds heat and shortens the life of the friction materials.
It might help to have a shop hook up a line pressure gauge on the test ports and get an idea of what the pressures are doing.
1994 FZJ80. Elocked, MAF 3/2 Lift, BFG 315 KM2s, stock 4.10s, ARB bullbar and a Warn 8074 winch.
powered by an all-aluminum 335hp L33 Vortec V8
2004 Kona Stinky dee-lux.