Saculia

iTrader: (1)

I just finished putting my rear differential together after replacing the pinion yoke seal. I had purchased two quarts of lucas gear oil and also the LSD additive. Unfortunately, the guy at advance auto, where I purchased the lucas oil had accidentally pulled one quart of the 80W-90 gear oil, and the second quart was 85W-140. Without paying much attention I added the 85W-140 oil, thinking that I had gotten two quarts of 80W-90. By the time I realised the mistake, I had already emptied the whole quart of the heavier oil on top of the 4 ounces of limited slip additive. I filled up the rest of my differential with the 80W-90 and now I have 1 quart of 85w-140 and half of a quart of the 85w-140.
What are the negative consequences that can result from this? The car seems to go down the road fine without any strange noises or vibrations even after taking it to 80 mph. Other than increased drag on the rear axle as a result of the heavier oil, is there any damage that can occur as a result of this?
I plan on changing it back to the correct viscocity, but it may take me a couple of weeks before I get a chance to do that.

1fastam

iTrader: (1)

you must have gotten the bolt out,jimmy

Twin_Turbo

iTrader: (25)

Leave as is, the thicker visco oil will not thin out as much as the thinner one. Both will be fine.

Badass355ciz28

iTrader: (17)

Saculia

iTrader: (1)

Yes, I got the bolt out. It seems that it was the clamping force holding it in place. Nothing I did, including heating the carrier near the bold, worked. I ended up drilling a pilot hole through the bolt, removing the head and the differential cover, and then the bolt came out with a small extractor pretty much by hand.
Thanks for your help.

Saculia

iTrader: (1)

Do you think that it may get too thick when it gets cold in the winter?

big gear head

It's going to be fine. The 80W140 means that the viscosity is 80 when it's cold and 140 when it gets warm. Most new trucks come with 80W140 in them from the factory now. They use synthetic oil, but yours will be fine with what you have. I'm running Amsoil 75W140 in the 7.5 in my S truck because of the locker. Haven't had any problems with it in over 130,000 miles.