I would suggest that you install a pressure guage into the pres. port mk'd. F on the trans top cover's front. With coolant, engine oil, trans oil levels checked and trans oil at op temp., front wheels off ground, engage trans into FWR. and place engine spd. more then 1,000 rpm your transmission's pressure reading should be 100-128 psi. Note: the threads in the test port are 1/8 BSP and not 1/8 NPT. More refined assistance can be given if the model and serial number are known.