I have more of a generic answer. When the temperature gauge starts climbing towards hot and if the oil pressure starts droppping.

As far as a specfic rpm something like 4000-4500 on extended long hill pulls. At least on 3.4 and 2.6.


Curt B 89RS Calmini Header Delta Cam 33x10.5 BFG MTs & 90 Trooper 3.4 v6, SAS D44 ARB/Hobart 5.38s 35s my pictures