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Gerard Offline
#1 Posted : Saturday, 2 March 2019 11:19:03 AM(UTC)
Gerard

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The oil in the diff in my car is about 10-12 mm below the filler hole so a bit low. I drained the oil in this diff and refilled it around 1976-77. Don't remember what brand of oil I refilled it with other than it would have been the correct type at that time for this diff.(seem to think it may have been a Castrol oil and I am fairly sure that it was a luminous blue colour?) Took the car off the road late 1978 and restored it from 2012 -2016. Fitted new wheel bearings at this time and probably lost a bit of oil while doing this. The car has travelled close to 99,000 miles with about 2,500 of those miles since registering it in December 2016.

I have some questions about topping up the oil in the diff, or changing it:

1. What type of oil do buy these days to use in this diff? I have been advised to to use the following oil - Brad Penn - Grade 1 Limited slip. - GL - 5 SAE 80W. - 90 gear oil. Yes/No?

2. Is it better to drain the diff and refill it with the current correct type of oil than to add this oil, to the existing oil in the diff? Yes/No?

3. If I drain the oil in the diff should I flush the diff while the cover is off? I ask about flushing the diff as I did this once on another ten bolt lsd (taken from a car that I didn't get to drive - so no idea of what it sounded like) When I put this diff into another car I had then it had a whine whenever you backed off. I was told the whine was a result of flushing the diff?

Any comments appreciated

Gerard
castellan Offline
#2 Posted : Sunday, 3 March 2019 10:25:18 AM(UTC)
castellan

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Originally Posted by: Gerard Go to Quoted Post
The oil in the diff in my car is about 10-12 mm below the filler hole so a bit low. I drained the oil in this diff and refilled it around 1976-77. Don't remember what brand of oil I refilled it with other than it would have been the correct type at that time for this diff.(seem to think it may have been a Castrol oil and I am fairly sure that it was a luminous blue colour?) Took the car off the road late 1978 and restored it from 2012 -2016. Fitted new wheel bearings at this time and probably lost a bit of oil while doing this. The car has travelled close to 99,000 miles with about 2,500 of those miles since registering it in December 2016.

I have some questions about topping up the oil in the diff, or changing it:

1. What type of oil do buy these days to use in this diff? I have been advised to to use the following oil - Brad Penn - Grade 1 Limited slip. - GL - 5 SAE 80W. - 90 gear oil. Yes/No?

2. Is it better to drain the diff and refill it with the current correct type of oil than to add this oil, to the existing oil in the diff? Yes/No?

3. If I drain the oil in the diff should I flush the diff while the cover is off? I ask about flushing the diff as I did this once on another ten bolt lsd (taken from a car that I didn't get to drive - so no idea of what it sounded like) When I put this diff into another car I had then it had a whine whenever you backed off. I was told the whine was a result of flushing the diff?

Any comments appreciated

Gerard

I would no flush a diff, just wipe with a clean rag if need be when you take off the cover.

Just use the recommended oil. and change it is the best insurance I would think.
Sandaro Offline
#3 Posted : Sunday, 3 March 2019 12:42:24 PM(UTC)
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Manual says Gm lubricant 9985035 only, and I remember an old bloke I knew telling me never put a normal LSD oil in it, only the specified stuff due to the cones v clutch pack on other lsds . I don't know if that's right or wrong, but I would look into it if I were you
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