Diff Fluid for 8 1/4 no suregrip?

[JR_Charger]

The manual says SAE 90 but O'Reilly's says 75W-90?

 

[Gold Rush]

The manual says SAE 90 but O'Reilly's says 75W-90?

Could be because O'Reilly's does not sell straight 90 weight gear oil these days. The 75W-90 should be just fine. Wouldn't take hardly any time to for the oil to warm up to where the 75 weight was a non-player anyway.

 

[JR_Charger]

Does anyone sell 90 weight?

 

[RemCharger]

Just plain old 80-90.

 

[oldkimmer]

May depend where your at. If you’re in one of the hotter states you may want to use 140 weight. Kim

 

[JR_Charger]

Just plain old 80-90.

Like this? On eBay for half the price of O'Reilly's Lucas Synthetic.

 

[RemCharger]

Like this? On eBay for half the price of O'Reilly's Lucas Synthetic.


View attachment 1651389

Egg-zactly.

 

[kiwigtx]

Egg-zactly.

That's catching on now.

The manual says SAE 90 but O'Reilly's says 75W-90?

You need to talk with an older guy at any Parts Store.....not the spotty-faced teenager playing with his cellphone.

 

[RJRENTON]

The manual says SAE 90 but O'Reilly's says 75W-90?

Will O'Reilly repair the transmission based on their recommendations? .....probably not....they recommend what they sell based on margin. How about 000 (triple 0) a semi-fluid semi-solid used on heavily loaded slow turning open gear trane if you're worried about temperature.
BOB RENTON

 

[JR_Charger]

That's catching on now.

You need to talk with an older guy at any Parts Store.....not the spotty-faced teenager playing with his cellphone.

I was looking at the website.

I've seen older guys at the O'Reilly's, but I rarely see the same person twice.

I ordered the UltraPlus stuff above.

 

[RemCharger]

That's catching on now.

A timeless classic for sure

 

[1STMP]

The manual says SAE 90 but O'Reilly's says 75W-90?

Don't forget the friction
modifier for that sure-grip.
Some brands claim to
have it already blended
in but I wouldn't trust
that they take in to
consideration, requirements
for older differentials. It
won't hurt to add an ounce
or two.

 

[JR_Charger]

No Suregrip - looked into it, but the pre-97 8 1/4 isn't worth building.

 

[1STMP]

No Suregrip - looked into it, but the pre-97 8 1/4 isn't worth building.

Sorry all, didn't see the "no"
in the post title.