Do any of your SR model 8 inch rear diffs have the " howling " ?

Tacoma trucks are fitted with one of two rear drum-braked axles depending on configuration. The BD20 axle has an 8-inch ring gear and this axle is basically carryover from the previous truck, but it does have some changes including a new gearset. (This is what I have)


There’s also a brand-new rear axle with 8.75-inch ring gear and high-strength axletubes. The BD22A is the “normal” 8.75-inch axle and the BD22AN 8.75-inch axle is fitted with an electric rear locker.

The BD22AN will be included in TRD Off-Road package-equipped trucks.

These new 8.75-inch axles contribute to a gross axle weight rating improvement of 24 percent. It’s also worth noting that the electronic rear diff locker now has an internally-mounted drive motor as opposed to the external motor found on the previous Tacoma. (These are the ones prone to the "howling")


If you could please state your model, year, and what rear end you have,your mileage, auto or manual trans and if you have the "howl".

My hope is Toyota at least addresses the problem for the guys/gals with the 8.75 diff howl.


Me:
2017 SR Utility AT @ 4k miles
8 inch rear end
NO HOWL

 

The 8.75" rears come with the Pro model and the Limited model and also on any truck with a 6speed manual tranny.

TRD Sport with the 8.75 rear - no howl that I can hear...I have larger tires so at 55 or so when the rear might be howling, my tires are probably louder.

20K miles and trouble free.. only problem I have is getting the dealership to lube my truck when I take it in for service. They think all the Gen3s have sealed zirks.

 

I hqve not had 1 single problem with mine yet either, really liking this truck.

 

Me:
2017 SR w/convenience MT @ 34k miles
8.75 inch rear end
NO HOWL

It is weeping/leaking, though.

 

2017 sr5 DCLB. Both 1st and 2nd rear diffs howl. Really annoying. Stay away from these trucks. Every truck on the dealer's lot does it.

 

Your rear end is not a carryover. the previous Tacoma (2nd gen) has an 8.4 inch rear end and is completely different and shares nothing with 3nd gen. Your new 8" is similar to the early (pre 95) Toyota trucks 8 " V6 except it has larger ring gear bolts.

 

17 DCSB SR5 so 8" rear end.

1500 miles

No howl.

I just changed the diff fluid today to Amsoil 75w90 Severe Gear. The factory fill was pretty nasty for 1500 miles. The magnetic drain plug had lots of fuzz on it, but nothing I would consider bad.

Getting lots of fine particles in gear oil will erode the face of the gears and then you lose tolerances and the gears will whine. Usually that happens after 10's to 100's of thousands of miles on gear lube by people who never change it, but who knows, might be happening on some trucks very early in their lives.

 

8.75 manual TRD sport. No howl or any other problem at 8K miles.

 

25k on my sr no howl.