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post #1 of (permalink) Old 01-01-2001, 10:31 AM Thread Starter
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which gear oil to use? \"in Transfercase\"

Happy New Year to all,
my first project of the year will be to install my Dual-Transfercase @http://www.geocities.com/yj3qtr_ton/2transfercase.html
i've posted about this setup few times, but basically i'm using the low range section of a NP203 (which is designed to run on 10w30 or 10w40) and a Dana 20 (uses 80/90w) i did not put a seal between the 2 gearboxes so they will be able to pass fluids through the bearings. (i can't guess how much or which way, so i installed a "Transfer Tube" twards the bottom of each case so the fluid levels can equalize, if one is pumping into the other)
so, since i'm only using the front section of the NP203 (a couple big gears with input/output shafts) and i'm not using the main body, chain or tail housing with the "Differential" in it, i think 80/90W might be best. but i'm might be swaying that way because it doesn't leak as easy as engine oil[img]/wwwthreads_images/icons/smile.gif[/img]

<font color=red>3/4tonYJ</font color=red>

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post #2 of (permalink) Old 01-01-2001, 11:39 AM
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Re: which gear oil to use? \"in Transfercase\"

I think you have the right idea with the gear oil. But what about a gear oil that covers a bigger range, like 75-90W.

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post #3 of (permalink) Old 01-01-2001, 12:19 PM
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Re: which gear oil to use? \"in Transfercase\"

I use nothing but royal purple synthenic gear lube in the tcase and rears in the cj. I have seen how good it works. The shop that does my welding and rears for me used it to put a rear together. They gave the rear to the owner and told them to put gear oil in it and break it in. Well they broke it in, drove for 5 miles, but never put oil in it. The only bearing to get any damage was the pinion bearing. After seeing that i was hooked. It is about 10 bucks a quart and if the seals and gaskets are old will leak like a waterfall for a while (until the oil softens the rubber and cork). It has been in the cj since feb. leaked until about june and i havent added any since then. This stuff is thin and very sticky. Good luck

80 cj7, 304, auto, 33" tsl swampers, 4" softride superlift
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post #4 of (permalink) Old 01-02-2001, 05:41 PM
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Re: which gear oil to use? \"in Transfercase\"

it's my understanding that the chain is what requires the thinner oil. since you are not using the chain, the thicker oil should be ok for the 203 reduction unit.

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