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Old 10-20-2013, 08:09 PM
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diff lube ?

What's the thoughts on using Lucas oil and posi additive for replacement lube ? I installed a 75, 8.5 Camaro diff with a 308 posi in my 76 f/bird a few thousand mi. ago and I just wanted to renew the lube after it was driven awhile. It was a used one with lower mileage on it but I wasn't sure how long it'd been setting before I put it in . I put new brgs. and fluid in when I installed it . Guess I just want to be sure as I can be that I do a good job at keeping it working and serviced properly !!! Thanks

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Old 10-21-2013, 06:03 AM
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That should work fine. Just be sure that you use the GM additive and not the crap that they sell at the auto parts sotres.
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Old 10-21-2013, 11:19 AM
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In manual gearboxes, Lucas gives us fits. I shoulda known, Any product named Lucas brings back nightmares about wiring a TR4
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Old 10-21-2013, 01:22 PM
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75W90 or 75W140 Synthetic

I suggest using a synthetic 75W90 gear lube with Ford's Posi additive. The synthetic will remain at a constant viscosity regardless of temperature, as well as keep the heat down in the rear.
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Old 10-21-2013, 04:58 PM
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I used Amsoil in most of the rear ends that I built for about 15 years. I only had problems with 2 cone type differentials. The Ford additive is also good.
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