I know your running a 3200 stall but i never could get mine with the stock converter to even get close to 190* pulling a heavy trailer thru the pasture in first gear pushig the converter to 2800 but barely moving. And the fans never come on high.

Id say you got a slipping issue.
Log engine rpms and torque converter slip speed mine throws a -2 thru +2 while towing on the clutch slip.

 

Ok Ill check that out and see what i find.

 

Well checked the converter lockup % and Its at 95% on cruise at 55mph.

 

Were you watching TCC slip rpm?

 

Yea where should it be at?

 

None. Or only a few RPM.

 

yea when it was locked it was none or 1 or 2 rpm.

 

That's what you want to see.

 

Ok good so you think the problem might be with the vacuum modulator giving the trans too much pressure?

 

What is pulling the air across the cooler? Electric fans, or mechanical fan?