Rear diff shudders after changing fluid

2008 Tacoma TRD Sport Prerunner V6 4x4

I just changed my rear diff oil and now it shudders during slow sharp turns moving forward and in reverse. I used Valvoline FlexFill Full Synthetic SAE

$30 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75W-90 Gear Oil. I added 3 qts. Which brought it right up to the fill plug. Anyone know where I went wrong? What is causing this shudder?

 

PreRunner?

 

If you are sure it is only the rear diff, and you just changed fluid, and you ALSO added LS friction modifier... just drive it in circles in an empty parking lot. If you didn't add LS fluid... do that.

 

I think it’sSR5

 

I didn’t add LS fluid. The bottles of diff oil say it’s already in it. Does it need more?

 

It should not need the additive but maybe your gears have tighter tolerance and needs it. I use the same gear oil in my 07 and it runs well without any additives.

 

Ok. I might run it for another 20 miles or so and see if it loosens up. From what I’ve read on other threads some people with the LSD have good luck adding StaLube EquaTorque Friction Modifier. Might give that a try

 

Final verdict: I ran it another 5 miles or so and now it’s smooth as butter. I let everything cool down to make sure it wasn’t just a result of warming up and it’s still good . I’m pretty sure it’s always used conventional so maybe it needed some time to work the synthetic into all the spaces.

 

Does the diff have a sticker on it that says “LSD oil”