I have a chatter feel upon taking off almost feels like 4x4 locked in but it is coming from the rear area.it smooths out after couple miles hr, but sounds loud from the rearend area.with a vibration.Any help please.Thank you Adam

 

Jack the rear tires up off the ground check for worn out u-joints in the rear prop shaft going from the transmission to the rear gear case. Also have you kept up service on the rear gear case?, have had a couple where the ring and pinion were badly worn causing vibration,plus are splines on prop shaft to rear end tight on gear case? This is another area that could cause vibration along with worn drive shaft cv joints. Lifting up off the ground and turning the rear tires back and forth can help find any worn areas. OPT

 

Thank you,I have not had atv till reciently so cant say if it has been upkept proper,the bike has 900hrs on it.havnt even checked the rear end greese will do that along with checking ujoints tomorrow it is a very obviuos chatter feeling,like sometimes when the 4x4 is locked and you get that feeling but in the rear end.It may be low on rear end grease as well,what weight should be used?

 

Gl5 80-90 gear fluid for the rear gear case,plus when you lift up check the rear parking brake rotor for any warping. Another area that could cause chattering and vibration if it hits the park brake caliper? OPT