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I am not sure, because I have a 5-speed manual, but do the auto Ts have a lockup torque converter? If so, maybe yours isn't locking up at highway speeds leading to overheating (lots of slipping at higher revs)? Again, I'm not sure if the autos have that but it might be a possibility. Good luck! <img src="/forums/images/graemlins/kewl.gif" alt="" />


Yes...the auto trans have a lockup torque converter.

Who and how was the ATF replaced? Did you ever install an aux cooler? When you had the ATF flushed before, what technique was used to flush it?

1998 T-100 Xtra cab SR5 2WD Auto; Roadmaster Active Suspension; Yokohama Geolander HT-S; lowered air dam; full belly pan; 4? diffuser; 11" side skirts; dual transmission coolers; 67% grill blocked; Auto-RX'd; ScanGauge II/Ultra-Gauge