... I use the advance dexron since you can get it in the gallon jugs and i cant seem to get my modulator to stop leaking. ...
Sorry for the double post, but I just re-read yours, and realized I left something out.
I hope, when you say "advance dexron" you are not talking about anything other than Dexron-III. The newest stuff, Dexron-VI, and the older Dexron-IV are definitely NOT approved for use in the HT740.
In fact, if you've been using one of these, that might explain the leaking modulator (or might not -- I'm definitely not a tranny expert).. If so, I would flush the tranny out and refill with Dexron-III.
My leak is where the Modulater goes in, I have replaced the O=ring and that held for a while,
but it leaks when it is sitting and has started again but is much slower. didn't have to add after sitting for a week. used to be over night. I'm wondering if the modulator is too tight and is pushing the housing out when you heavy pedal it. I have upgraded the hold down to one from a Chevy tranny and then put both on when that didn't work. If any body has had any experience here, please chime in.
I just went and checked a jug, it is dexron 3/ mercon and that was on the website. It's about 8 bucks a gallon. I usually have to add 1.5 gallons if its been sitting a while. I'm not thinking about changing to oil, i had just heard that you could and found it interesting. However if it used 40 wt, it might be convienient to carry one kind of oil
. I am a big fan of synthetic lubricants and try to use them wherever possible.