Rear main seal leaking

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Tukkr

TYF Newbie
Joined
Feb 3, 2020
Posts
22
Reaction score
29
Location
The Netherlands
I need to replace my rear main seal because its starting to leak (nowadays I find a small puddle each morning).

I have looked on rockauto.com and found the following part no. GM GENUINE 12639250

Is this the correct part? (could not find it under my vehicle in rockauto) and should I replace other stuff while my mechanic is at it? Just making sure because I have to order everything from the States.

Thanks!

Shopping list based upon comments (via rockauto):

1x GM GENUINE - crankshaft main bearing - part no. 12639250 ($58,00)
1x FEL-PRO - oil pan gasket - part no. OS30693R ($38,00)
1x MELLING - oil pump pickup tube - part no. 324S ($85,00)
1x GM GENUINE - transmission mount - part no. 15113134 ($47,00)
1x GM GENUINE - torque converter shaft seal - part no. 24202535 ($5,00)
1x FEL-PRO - oil cooler gasket - part no. 72462 ($5,00)
1x FEL-PRO - oil pump pickup tube o-ring - part no. 72401 ($2,00)
1x MAHLE - oil pump pickup tube gasket - part no. B32790 ($2,00)
1x MELLING - oil pump pickup tube bracket - part no. ($19,00)

Don't know however if I have the quantities correct! please let me know :)

kr,
Nick20210922_113704.jpg
 
Last edited:

91RS

Full Access Member
Joined
Nov 15, 2009
Posts
2,588
Reaction score
2,033
Location
GA
I do believe that is correct. You definitely want the whole housing that comes with the new gasket and rear main seal itself. I would go ahead and do an oil pan gasket at the same time by the looks of it.
 

mattbta

Full Access Member
Joined
Jun 19, 2012
Posts
1,105
Reaction score
2,037
Location
Frisco, TX
Need mine done, too. I have one of these in the glovebox waiting to go in. Figured while the trans is out, might as well.

 

Joseph Garcia

Supporting Member
Joined
Aug 2, 2018
Posts
7,340
Reaction score
9,921
I need to replace my rear main seal because its starting to leak (nowadays I find a small puddle each morning).

I have looked on rockauto.com and found the following part no. GM GENUINE 12639250

Is this the correct part? (could not find it under my vehicle in rockauto) and should I replace other stuff while my mechanic is at it? Just making sure because I have to order everything from the States.

Thanks!

kr,
NickView attachment 351027
If you want to be sure, post the last 8 digits of your VIN, and @915_Tahoe will provide you with the correct part number. As @91RS stated, "You definitely want the whole housing that comes with the new gasket and rear main seal itself".
 

Mudsport96

Full Access Member
Joined
Jun 6, 2020
Posts
1,322
Reaction score
2,122
Location
40.923,-89.488. Illinois
Third on doing the oring while there, and i would do the block off plate/ oil cooler adapter gasket as well. The father in law paid to have his rear main done to stop a leak, still had the mess in the driveway.
Ended up being to the block off plate. Five dollar gasket you can do in a driveway in 5 minutes cost him 300 at the shop to fix a problem he didn't have.
 

OR VietVet

Multnomah Falls
Supporting Member
Military
Joined
Oct 8, 2014
Posts
20,712
Reaction score
36,497
Location
Willamette Valley
Oil and filter of course, pickup tube o-ring, oil pan gasket and make sure to clean out or replace the oil pickup tube while apart. Complete rear main seal assembly and I did the torque converter seal when apart. Definitely the oil cooler lines plate/block off. If is easy to get to while apart, do the oil sender switch. Check the transmission mount and replace as needed.
 

915_Tahoe

Your GM Parts Specialist
Joined
Jul 1, 2018
Posts
1,349
Reaction score
1,901
Location
HELL PASO, TX
Cr/Shf RR oils seal Housing with gasket and seal
Gm#12639250 $83.93

Rear main seal
Gm#89060436 $30.65

Rear housing gasket
Gm#12639249 $30.62

Oil pan gasket
Gm#12612350 $49.73

Pickup tube seal
Gm#12584922 $9.47

Side cover gasket without engine cooler
Gm12611384 $4.79
 

Forum statistics

Threads
132,307
Posts
1,865,713
Members
96,896
Latest member
grass209
Top