Rear axle seals - The 1947 - Present Chevrolet & GMC Truck Message Board Network

wugunguy · 07-28-2007, 11:13 AM

I rebuilt the rearend for my 70 1/2 ton awhile back and was cleaning a few things up the other day when I noticed that both rear axle seals were/had been dripping-oil spots right below them on the concrete. The pinion seal also has this too. Is there something special that needs to be done to prevent these from leaking?-it's not bad but I want to fix it before I go any further.

any help is greatly appreciated.

**truckdude239** · 07-28-2007, 11:16 AM

well make sure the the axles aren't wore to far so that the seals aren't doing there jobs other then that i dont know make a heavey duty seal?

JimKshortstep4x4 · 07-29-2007, 05:36 AM

With all three seals leaking, my thought would be to make absolutely sure that the vent tube is not plugged before changing the seals. If the vent tube is plugged, pressure will build up in the axle housing forcing the oil out.

I am assuming that new seals were installed during the rebuild, if not new seals would be in order if the sealing surfaces are good.

Jim

Blazer1970 · 07-29-2007, 07:09 AM

If there is a groove worn into the shaft/pinion where the seal rides, a new seal will leak. My guess would be that this is your problem on all three.

wugunguy · 07-29-2007, 04:21 PM

thanks for the info everyone, I'm going to check it out later this week

68 P.O.S. · 07-29-2007, 05:44 PM

I found out my axle seals were shot when I suddenly lost 50% of my stopping power because the gear oil got into the brakes.

Musclerodz · 07-30-2007, 01:37 PM

There is a axle shaft repair seal that is beefer than the original seal and moves the seal to a different point on the axle shaft so it is not riding in the groove. They are pricey but cheaper than a new axle. I think around $28 each

Mike

fastwillie 696969 · 07-30-2007, 02:36 PM

Quote:

Originally Posted by Musclerodz

There is a axle shaft repair seal that is beefer than the original seal and moves the seal to a different point on the axle shaft so it is not riding in the groove. They are pricey but cheaper than a new axle. I think around $28 each

Mike

never heard of these before
show me a link to these parts please

Musclerodz · 07-30-2007, 05:59 PM

Quote:

Originally Posted by 70blowngmc

never heard of these before
show me a link to these parts please

you can get them from O'Reilly's, NAPA, etc. I will find the part number and post tommorrow.

Mike

Musclerodz · 07-30-2007, 06:02 PM

What they do is combine the outer bearing with the seal. They have an o-ring on the perimeter and are a much better sealed outer roller bearing with a n intergal seal.

bcminimart · 07-30-2007, 06:05 PM

BCA part # s are RP5707, for certain rear ends, just tell the parts guy you need repair bearings for your axles,better luck if you go to a NAPA or other independent parts place,the guys there usually know what you are talking about! Bob

07-28-2007, 11:13 AM	#1
wugunguy 70 C/10-Work in progress Join Date: Aug 2005 Location: Kansas Posts: 601	Rear axle seals I rebuilt the rearend for my 70 1/2 ton awhile back and was cleaning a few things up the other day when I noticed that both rear axle seals were/had been dripping-oil spots right below them on the concrete. The pinion seal also has this too. Is there something special that needs to be done to prevent these from leaking?-it's not bad but I want to fix it before I go any further. any help is greatly appreciated. __________________ In the garage 1999 Dodge Dakota Sport-Daily Driver 1972 Chevy K/5 CST AC/PS/PB/4x4/Tow Hooks/Tilt 1970 Chevy C/10-Current project

07-28-2007, 11:16 AM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,237	Re: Rear axle seals well make sure the the axles aren't wore to far so that the seals aren't doing there jobs other then that i dont know make a heavey duty seal? __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

07-29-2007, 05:36 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Rear axle seals With all three seals leaking, my thought would be to make absolutely sure that the vent tube is not plugged before changing the seals. If the vent tube is plugged, pressure will build up in the axle housing forcing the oil out. I am assuming that new seals were installed during the rebuild, if not new seals would be in order if the sealing surfaces are good. Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

07-29-2007, 07:09 AM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,510	Re: Rear axle seals If there is a groove worn into the shaft/pinion where the seal rides, a new seal will leak. My guess would be that this is your problem on all three. __________________ Tim

07-29-2007, 04:21 PM	#5
wugunguy 70 C/10-Work in progress Join Date: Aug 2005 Location: Kansas Posts: 601	Re: Rear axle seals thanks for the info everyone, I'm going to check it out later this week __________________ In the garage 1999 Dodge Dakota Sport-Daily Driver 1972 Chevy K/5 CST AC/PS/PB/4x4/Tow Hooks/Tilt 1970 Chevy C/10-Current project

07-29-2007, 05:44 PM	#6
68 P.O.S. Registered User Join Date: Jan 2007 Location: Puyallup, WA Posts: 1,662	Re: Rear axle seals I found out my axle seals were shot when I suddenly lost 50% of my stopping power because the gear oil got into the brakes. __________________ 72 C10 lwb fleetside -stock 350/350 combo

07-30-2007, 01:37 PM	#7
Musclerodz Senior Member Join Date: Aug 2005 Location: OKC, OK Posts: 2,365	Re: Rear axle seals There is a axle shaft repair seal that is beefer than the original seal and moves the seal to a different point on the axle shaft so it is not riding in the groove. They are pricey but cheaper than a new axle. I think around $28 each Mike __________________ Mike Redpath

07-30-2007, 06:02 PM	#10
Musclerodz Senior Member Join Date: Aug 2005 Location: OKC, OK Posts: 2,365	Re: Rear axle seals What they do is combine the outer bearing with the seal. They have an o-ring on the perimeter and are a much better sealed outer roller bearing with a n intergal seal. __________________ Mike Redpath

07-30-2007, 06:05 PM	#11
bcminimart Registered User Join Date: Jun 2006 Location: Alabama Posts: 54	Re: Rear axle seals BCA part # s are RP5707, for certain rear ends, just tell the parts guy you need repair bearings for your axles,better luck if you go to a NAPA or other independent parts place,the guys there usually know what you are talking about! Bob



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