I have a 2001 JD LT 155 that I think I having issues with the trans. Here recently it's having problems going up a slight hill. The drive belt is in good shape and tight, all the pulleys are good, I cleaned off all the dirt on the trans and still having this issue. The only way I can really describe it, it's almost like a surging feel, kind of like the drive belt is not tight enough or something. I'm assuming it must be something internally. My dad bought it brand new back in 01 (been a good little lawn mower) and to my knowledge the trans has never been serviced. Any help would be greatly appreciated.