I own a Poulin Pro Model PP175G42 with peerless transaxle 206-565 (197941) that I'm having issues with. The mower is about 4 years old. The issues is when i use 4th gear, the mover jerks and lunges when going uphill. The mower runs fine in any other gear, but unfortunately, I have away used 4th gear to cut glass with. I'm guess there is an issue with one of the gears in the transaxle but need some advice. Anyone ever ran into this issue?