Allison 750 shifting issue

[luvrbus]

Walter,they all generate the same amount of heat regardless of the oil,it is just the synthetic is supposed to withstand the heat better than a conventional ATF I have never seen the temperature drop the Transyd is supposed to provide myself  

[sledhead]

I have a ht 740 and when I changed the engine oil , filter every year . I also change the 2 trans . filters and fill them with 5 new ltrs of fresh oil .

easy to do and it makes me feel better

dave

[robertglines1]

ck air modulator on side of trans curb side. Rite after turning engine off go back to tag area and listen for bubbles. This was on my 89 prevost. replaced modulator and all was good.  Easy check also make sure air hose is still attached or no hole in it...  Prob way out in left field but the bubbling is what tipped me off.  Bob