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I put 80w90 Lucas conventional in my rear diff. The stuff that was in there was dark and metallic looking. It’s a 2007 limited slip, with 4:10 gears. I took the pan off the first time I changed it at about 40,000 miles and it was even nastier. But that time I put in 75w140 synthetic with the friction modifier and added a tube of friction modifier. So this time, no friction modifier added. I figured since I only pumped it out this time, a lot of the old stuff is still in there and some of it probably soaked into the clutches. Oh, also the fill plug for the rear actually has a magnet on it and it had a little bit of flakes on it. The front fill plug does not have a magnet.
I was going to change the front. I put in synthetic 75w140 the previous time. I was told 80w90 for the front. So now hearing that, I wanted to put the correct stuff in. But lo and behold, the front fluid still looked mint! And I couldn’t get the pump hose down in there to pump the old stuff out. So I just left it.
So I think a ‘one and done’ change in the front, with s quality full synthetic and maybe every 20-30,000 miles on a rear diff with limited slip. Probably longer if it’s an open diff.
Just thought I’d share. Please ask any questions about it...
I was going to change the front. I put in synthetic 75w140 the previous time. I was told 80w90 for the front. So now hearing that, I wanted to put the correct stuff in. But lo and behold, the front fluid still looked mint! And I couldn’t get the pump hose down in there to pump the old stuff out. So I just left it.
So I think a ‘one and done’ change in the front, with s quality full synthetic and maybe every 20-30,000 miles on a rear diff with limited slip. Probably longer if it’s an open diff.
Just thought I’d share. Please ask any questions about it...
