I have a 98 4runner with 3.4L V6 and a noisy R150F 5speed. Vehicle has 75000 miles and hasn’t done any heavy towing etc. Over the past year and a half (25000mi) the tranny has developed significant gear whine in all but 4th gear. The noise is particularly noticeable when unloading the geartrain such as backing off the throttle on a downhill, and sounds like pinion noise in a worn rear diff, but definitely never appears in 4th. This lead me to think input bearing or front bearing on the countershaft. I recently pulled the tranny and replaced these bearings. Inspection of the old bearings showed they were in decent shape but I had special ordered new ones, so replaced them anyway. Everything else appeared fine. Upon re-assembly and test drive, I still have my noise…and a wasted weekend
Anyone have any thoughts on the source of the noise?
ddl4run
