Hey there, so I’ve been in a bit of a haste the past two months with my 4Runner, it’s a 2003 4.7 4wd sport edition, so I started to get this popping noise coming from the front/middle of the vehicle. Now keep in mind before this happened my transfer case would never let me go into 4low so I never touched it. Anyways, the popping noise continued to get worse and worse so I figured it’s An axle so I replaced the axles, meanwhile it still done it. So I took out the center differential and turned on differential lock and it would go just fine without a popping noise so I figure it was the front driveshaft so I replaced it with a brand new one. Same issue, soon as this started happening my transfer case started to work and I could drive in 4low, before the transfer case would never lock into 4low. Ever. It will not pop when the road is complete straight, but if there is a hill or a bump or a curve it pops, like so badly you can feel it through the whole vehicle and hear it outside the vehicle, one thing I tested with the new front driveshaft was that I put the truck in 4low and it was literally able to go up to 50mph.... like wtf?



im running in circles here lost and I have no idea what to do, I have a family of two and I’m just so lost cause it’s the only vehicle that we have.



what is your thoughts

 

Bump bump bump

 

Is is a single pop? or does it cycle over and over? If so, is it speed dependent?

Is there any association with wet conditions?