camojay

Thank you for your response! We tore apart the rear diff and you are 100% correct. The splines inside the rear diff and drive shaft/coupler piece were stripped. Poor design... no zerts to grease it and it was pretty badly rusted out. This issue began by simply pulling out of the driveway after it had been sitting a few days. The use before that was also mellow, level ground, nothing difficult or torquey. Just rusty and hit it's limit. FYI for anyone with sinar issues, ee found good prices for the HiSUN Sector 450 parts via telephone from Yarborough Equipment in Strafford MO.

When we first heard the noise, we immediately stopped driving it...at first we thought it might be a linkage issue, but after further inspection looks like the sound/jolting is coming from the rear diff. Took a video below... Anyone know what is creating the diff to skip/jump like this? We drained the diff oil and didn't look terrible, no metal. Other info that may be useful: 1400 miles on it Recently tightened the E brake P.s. never posted on this forum before, let me know if the video does not work 20240817_133539_1.mp4