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Old 01-24-2011, 03:31 AM
elcliffo elcliffo is offline
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Default New Gears, what type of gear oil should I run??

Hey Guys,

Have a 2003 ram 1500 4.7L. It had 3.55 gears and I just replaced them with Motive 4.10s (I am in the process of breaking them in right now). Open differential, no LSD.

Dodge of course recommends 75w-140 synthetic oil in the differential, but the information that came with the motive gears called for 80w-90. I called a local 4x4 shop and they said if they were the ones changing the gears, they would have put in conventional 80w-90. So after installing the new gears I put in 80w-90 Lucas Heavy Duty Gear Oil and all seems to be working good right now.

Was this good oil to put in? After the break in should I go back to the synthetic stuff? If i do, how carefull do I need to be about mixing some of the residue of the dino oil left in the differential with the synthetic stuff? I did the gear change to improve my towing and plan on towing a lot?

thanks
elcliffo
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Old 01-24-2011, 08:47 AM
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The oil you have now is good stuff but if you changed gears because you're going to tow a lot, I'd recommend breaking in your new gears with what you have and then switch back to the 75W-140 synthetic.
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