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Gear Oil replacement question...

Guest Anonymous

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Guest Anonymous


Question for the gear oil gurus:

my 72tii received a MM 5 spd kit which I mated to a 3:9 LSD rear end. At the time of assembly I chose Redline Synthetic for both trans and rear. The rear end received heavy weight (90W).

Well, I haven't been happy with it since the synthetic was too thin and provided some noise.

Well, as a test I just went out and got some regular grade Lucas gear oil (75/90). I also got a second bottle of Lucas (85/140) and some additive to assist in the gears of the LSD.

Is there any reason why I couldn't use the 85/140 blend in my rear end? I was thinking of mixing half and half (75/90 & 85/140 for ~110 weight) but now am debating to just go the full 85/140 plus additive.


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Guest Anonymous

Go ahead and use the 85/140 in the rear end. I won't hurt it. But it will run hotter from the heavy oil churning than the thinner synthetic.

Also, I presume you got GL-4 for the gear box. No GL-5 there.

Lubrication Specialists.

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