12 Bolt Pinion seal leak

SSGN · 05-20-2021, 07:14 AM

I have a 68 Chevelle (original)12 bolt and the pinion seal leaks. New seal installed however there is a groove in the yoke. Does anyone have part # for a speedy sleeve or is it best to replace with aftermarket yoke? If so what brand and part # is the best??

Thanks in advance

NHRA1926 · 05-20-2021, 07:45 AM

My 12 bolt pinion seal was also leaking. Replaced the seal twice, still leaked. I found out that it was leaking around the OUTSIDE of the seal where it meets the housing. Housing was pitted pretty bad, so I ended up putting some RTV sealer around the outside of the seal before installing yet another new seal. That finally fixed the leak. You may want to look at that area on yours to eliminate that as the leaking area.

Herbie Null · 05-20-2021, 07:51 AM

Rock Auto has the yoke and repair sleeve.

USA STANDARD GEAR USA41152 Info
Rear Differential; GM 12 Bolt Passenger Car; Rear Pinion Yoke; U-Bolt Style; For Use w/ 1330 U-Joint; 1.063 in. Cap Diameter; 3.625 in. Span; Cast
$197.79

USA STANDARD GEAR USA41154 Info
Rear Differential; GM 12 Bolt Passenger Car; Rear Pinion Yoke; U-Bolt Style; For Use w/ 1350 U-Joint; 1.188 in. Cap Diameter; 3.625 in. Span; Billet Steel
$253.79

prostockpete1 · 05-20-2021, 11:01 AM

If you just want oem quality Dorman.com has pinion yokes and thinking most parts stores / Rock auto have

Adger Smith · 05-20-2021, 11:31 AM

Kevin,
If yours is the 1310 series with the straps.. I have a brand new Spicer that has been on the shelf 40 years.
call me
903 824 4924
Adger

Bill Bogues · 05-20-2021, 12:22 PM

Ive had trouble with a leaky pinion seal on 12 bolt. Finally I started putting a little rtv in pinion threads before I slid yoke on pinion. No more leaks.

Dana Fitzpatrick · 05-20-2021, 07:11 PM

I use a Ratech #6109 seal or the equivalent Strange part number.It puts the seal at the correct position on the yoke, most other seals do not and a leak will be the result.

Mark Ruset · 05-21-2021, 08:37 AM

Quote:

Originally Posted by Bill Bogues

Ive had trouble with a leaky pinion seal on 12 bolt. Finally I started putting a little rtv in pinion threads before I slid yoke on pinion. No more leaks.

Bill is correct, the pinion splines will leak gear oil out and fool you into thinking that the seal is leaking. I use the white liquid Teflon thread sealer with great results,

Bill Grubbs · 05-21-2021, 10:49 AM

Just use Ultra Grey in the well around the pinion nut. No leaks from the splines, and the nut will never ever move. no fuss...no muss...no leaks from the splines...no staking the pinion nut...and you can reuse the nut over and over. We are now on the 20th year on the nut, never a leak from the pinion splines, and never a loose pinion.

Warning!!! Don't expect to put Ultra Grey on and race immediately, you will have a mess. Let it set up over night before use. Also, it will take a few minutes to get the Ultra Grey off and remove the pinion nut. However, a wire wheel on a drill will clean the nut, washer, and yoke right up.

SSGN · 05-22-2021, 07:57 AM

Adger thanks for the offer but the big block has the 1330 U-joints. I pulled the shaft and checked. We always use the ultra grey on the splines also. I am looking at the Dennys stuff right now.
Thanks for the info,as usual a wealth of knowledge here.

05-20-2021, 07:14 AM	#1
SSGN Senior Member Join Date: Feb 2006 Posts: 646 Likes: 132 Liked 140 Times in 51 Posts	12 Bolt Pinion seal leak I have a 68 Chevelle (original)12 bolt and the pinion seal leaks. New seal installed however there is a groove in the yoke. Does anyone have part # for a speedy sleeve or is it best to replace with aftermarket yoke? If so what brand and part # is the best?? Thanks in advance __________________ The more people I meet the more I like my dog Kevin

05-20-2021, 07:45 AM	#2
NHRA1926 Member Join Date: Dec 2015 Location: Bowling green, Ky Posts: 241 Likes: 12 Liked 232 Times in 69 Posts	Re: 12 Bolt Pinion seal leak My 12 bolt pinion seal was also leaking. Replaced the seal twice, still leaked. I found out that it was leaking around the OUTSIDE of the seal where it meets the housing. Housing was pitted pretty bad, so I ended up putting some RTV sealer around the outside of the seal before installing yet another new seal. That finally fixed the leak. You may want to look at that area on yours to eliminate that as the leaking area.

05-20-2021, 07:51 AM	#3
Herbie Null Member Join Date: Aug 2008 Location: greencastle pa Posts: 215 Likes: 88 Liked 439 Times in 69 Posts	Re: 12 Bolt Pinion seal leak Rock Auto has the yoke and repair sleeve. USA STANDARD GEAR USA41152 Info Rear Differential; GM 12 Bolt Passenger Car; Rear Pinion Yoke; U-Bolt Style; For Use w/ 1330 U-Joint; 1.063 in. Cap Diameter; 3.625 in. Span; Cast $197.79 USA STANDARD GEAR USA41154 Info Rear Differential; GM 12 Bolt Passenger Car; Rear Pinion Yoke; U-Bolt Style; For Use w/ 1350 U-Joint; 1.188 in. Cap Diameter; 3.625 in. Span; Billet Steel $253.79 __________________ Herbie Null 201 SS

05-20-2021, 11:01 AM	#4
prostockpete1 Member Join Date: Mar 2012 Posts: 255 Likes: 3 Liked 90 Times in 52 Posts	Re: 12 Bolt Pinion seal leak If you just want oem quality Dorman.com has pinion yokes and thinking most parts stores / Rock auto have

05-20-2021, 11:31 AM	#5
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: 12 Bolt Pinion seal leak Kevin, If yours is the 1310 series with the straps.. I have a brand new Spicer that has been on the shelf 40 years. call me 903 824 4924 Adger __________________ Adger Smith (Former SS)

05-20-2021, 12:22 PM	#6
Bill Bogues Member Join Date: Apr 2005 Location: Bethany La. Posts: 323 Likes: 96 Liked 169 Times in 53 Posts	Re: 12 Bolt Pinion seal leak Ive had trouble with a leaky pinion seal on 12 bolt. Finally I started putting a little rtv in pinion threads before I slid yoke on pinion. No more leaks. __________________ Bill Bogues 4696 STK

05-20-2021, 07:11 PM	#7
Dana Fitzpatrick Member Join Date: May 2009 Posts: 148 Likes: 4 Liked 10 Times in 6 Posts	Re: 12 Bolt Pinion seal leak I use a Ratech #6109 seal or the equivalent Strange part number.It puts the seal at the correct position on the yoke, most other seals do not and a leak will be the result.

05-21-2021, 10:49 AM	#9
Bill Grubbs Member Join Date: Oct 2002 Location: Magnolia, Texas Posts: 416 Likes: 3 Liked 564 Times in 66 Posts	Re: 12 Bolt Pinion seal leak Just use Ultra Grey in the well around the pinion nut. No leaks from the splines, and the nut will never ever move. no fuss...no muss...no leaks from the splines...no staking the pinion nut...and you can reuse the nut over and over. We are now on the 20th year on the nut, never a leak from the pinion splines, and never a loose pinion. Warning!!! Don't expect to put Ultra Grey on and race immediately, you will have a mess. Let it set up over night before use. Also, it will take a few minutes to get the Ultra Grey off and remove the pinion nut. However, a wire wheel on a drill will clean the nut, washer, and yoke right up.

05-22-2021, 07:57 AM	#10
SSGN Senior Member Join Date: Feb 2006 Posts: 646 Likes: 132 Liked 140 Times in 51 Posts	Re: 12 Bolt Pinion seal leak Adger thanks for the offer but the big block has the 1330 U-joints. I pulled the shaft and checked. We always use the ultra grey on the splines also. I am looking at the Dennys stuff right now. Thanks for the info,as usual a wealth of knowledge here. __________________ The more people I meet the more I like my dog Kevin