Hello
Im after a AYC-to-RS rear diff change and rebuild, it was disassebled fully revised inside, backlash correction, new oil (motul comp 140), pattern check , everything is OK.
Now i set it back to the car after 2 months , and did a test round outside of the town. When i accelerate 3-4k rpm , and around 90-100km/h hear really quiet & fast clunks for a sec and i feel its slows down the car a little, but only for a sec and its gone. It feels like something holding the car back for a half a second and then lets it go. If i accelerate more the problem is reappears. I dont really know i feel the problem from the rear diff or from the transfer (i have all the 3 lights up due the diff change and some air iside the system now). Maybe the rear diff is locking-unlocking this is what i feel and hear ?
Have anyone a tip what is it or what i should check ?
Thanks!

 

little update and more precise: I accelerate the car to about 90-100 km/h while the rpm is above 3000 and it seems as if the drive sneezes. Meanwhile, low grunting sounds can be heard. It sneezes and continues, sneezes and grunts again and continues. It's as if the drive is missing for a moment. So it not holding the car back , just missing the drive and with it the torque.

 

do you have enough fluid in there? try to do a good bleed using the key + gas pedal