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Old 01-03-2009, 01:15 AM   #1
lts70
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Rearend advice

When I put my new inner axles in I plan on changing the gear oil to a full synthetic. Before I button it back up and fill it with the new oil how should I clean it out besides draining it? Brake clean? Is there any thing else I should do or check while I have it pulled apart? Bearings or seals? Right now I have no problem with my posi slipping, no noise, no leaks. I am hoping I can just swap the axles out and be done with it with out more time and cost. But if there is something I should do while I have it all apart I want it done right.

Thanks guys
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Old 01-03-2009, 07:24 AM   #2
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Re: Rearend advice

If you have no problems right now, I'd pop the lid, swap the axles, brake clean it on the inside, and button it up with new synthetic fluid.

By the way, be sure to smear a bit of grease around the axle seals as you slide the new axles in place so they don't run dry initially.
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Old 01-03-2009, 07:41 AM   #3
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Re: Rearend advice

I agree with TX.Did you just upgrade to hardened shafts?Just curious about the purpose of installing the new axles.You weren`t in there for any problems,right?
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Old 01-03-2009, 09:06 AM   #4
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Re: Rearend advice

I am curious about the term "inner axles"?
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Old 01-03-2009, 02:40 PM   #5
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Re: Rearend advice

while you have the old axles out, spend the time and put new axle seals in. They don't take much time and are well worth not having to take it all apart again. If you have a posi, don't forget to add the conditioner, it will blend with synthetic as well as hypoid.
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Old 01-03-2009, 04:28 PM   #6
lts70
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Re: Rearend advice

Tx Firefighter, Thanks for the advice, especially about the grease on the seals, I will be sure to do that.

LONGHAIR, I have always used that term to describe the axles, is it wrong?

special-K, I am switching my 70 from 6 lug to 5 lug to fit some new wheels I got for Christmas. And yes they are the hardened ones from summit racing , links below.

http://store.summitracing.com/partde...5&autoview=sku

http://67-72chevytrucks.com/vboard/s...d.php?t=318405

elkynova , I bought Valvoline Syn Power Full Synthetic 75W-90 Gear Oil and Lucas synthetic Oil Stabilizer Pure Synthetic that I use for my motor but on the back it says, " Adds additional lubricity and extra protection for any racing application; use in engines, transmissions and differentials". I figured I would go half and half. Is there a better option for Posi rearends?



Thanks Guys
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Last edited by lts70; 01-05-2009 at 11:53 AM.
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Old 01-05-2009, 11:58 AM   #7
lts70
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Re: Rearend advice

How much capacity does the rear differential have? What ratio of oil to additive would you guys use? Would you use some thing else besides what I got for an additive or oil?

My shipping confirmation said I will get the axles today or tomorrow. I will be posting pics as I go.
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