I have a Husqvarna LTH 1438 riding mower that will not go F or R. I'm pretty sure it has a Hydo gear T2 transaxle in it but can't find any more info then that. The mower is out of gear even with the by-pass valve in or out. I have the trans off the mower and need help determining what my problem is. The dealer said it was a sealed unit with no servicable parts inside but that's not the case. The oil level looks pretty good ( about an inch or so from the filler hole. Could it be something related to the by-pass valve? What do I need to look for? JoeN