Rearend advice - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lts70 · 01-03-2009, 01:15 AM

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

Tx Firefighter · 01-03-2009, 07:24 AM

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.

**special-K** · 01-03-2009, 07:41 AM

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?

LONGHAIR · 01-03-2009, 09:06 AM

I am curious about the term "inner axles"?

elkynova · 01-03-2009, 02:40 PM

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.

lts70 · 01-03-2009, 04:28 PM

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

lts70 · 01-05-2009, 11:58 AM

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.

01-03-2009, 01:15 AM	#1
lts70 1970 Daily Driver Join Date: Jun 2007 Location: Glenns Ferry IDAHO Posts: 1,038	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 __________________ It's not truly yours if you didn't build it yourself or if you don't do your own maintenance.

01-03-2009, 07:24 AM	#2
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	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. __________________ I'm on the Instagram- @Gearhead_Kevin

01-03-2009, 07:41 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	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? __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

01-03-2009, 02:40 PM	#5
elkynova Registered User Join Date: Dec 2008 Location: Richland, Wa. Posts: 15	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.

01-03-2009, 04:28 PM	#6
lts70 1970 Daily Driver Join Date: Jun 2007 Location: Glenns Ferry IDAHO Posts: 1,038	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 __________________ It's not truly yours if you didn't build it yourself or if you don't do your own maintenance. Last edited by lts70; 01-05-2009 at 11:53 AM.

01-05-2009, 11:58 AM	#7
lts70 1970 Daily Driver Join Date: Jun 2007 Location: Glenns Ferry IDAHO Posts: 1,038	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. __________________ It's not truly yours if you didn't build it yourself or if you don't do your own maintenance.



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