Finally doing rear seal job

[zissou]

Haven't had to do much maintenance this last year ever since resealing most all of the engine gaskets, but still had a small leak from the rear seal. Finally pulled the trans today. This week I'll be putting on a new rear cover/seal, new torque converter seals (24237531 & 24219390) and a new torque converter for good measure. Also doing a new barbell on the rear of the engine while I'm in there. Should finally be leak free after this.

242k miles on this 2007 Denali. Deleted the VVT about a year ago and put in a small cam. Probably will be selling the truck this Spring as I just picked up another, an 08 Escalade ESV in Pearl White with only 140k.

 

[mikeyss]

Look at those brakes!!!

 

[Duramax]

I did by myself on Jack stands un front of my home. It took me 2 days to replase trans+ real seal.

 

[ivin74]

Haven't had to do much maintenance this last year ever since resealing most all of the engine gaskets, but still had a small leak from the rear seal. Finally pulled the trans today. This week I'll be putting on a new rear cover/seal, new torque converter seals (24237531 & 24219390) and a new torque converter for good measure. Also doing a new barbell on the rear of the engine while I'm in there. Should finally be leak free after this.

242k miles on this 2007 Denali. Deleted the VVT about a year ago and put in a small cam. Probably will be selling the truck this Spring as I just picked up another, an 08 Escalade ESV in Pearl White with only 140k.

Are those the Cadillac CTS brake calipers?

 

[strutaeng]

Good job. I did this on my LQ4/4L80e 06 Suburban last year, but on jackstands in my backyard. I was at 250k and 10k later it's still nice and dry underneath.

I also replaced the engine barbell and trans front oil pump seal and torque converter lock up o ring. O'Reilly's gave me the wrong oil pump front seal, so I had to find the correct part number myself and go to the next store to find the right part. But other than that, went smoothly. I used the Sac City centering tool BTW.

 

[mattbta]

Good job. I did this on my LQ4/4L80e 06 Suburban last year, but on jackstands in my backyard. I was at 250k and 10k later it's still nice and dry underneath.

I also replaced the engine barbell and trans front oil pump seal and torque converter lock up o ring. O'Reilly's gave me the wrong oil pump front seal, so I had to find the correct part number myself and go to the next store to find the right part. But other than that, went smoothly. I used the Sac City centering tool BTW.

Did you use the Sac City billet barbell, too? I used theirs on my 800.

 

[strutaeng]

Did you use the Sac City billet barbell, too? I used theirs on my 800.

That's good to know. I didn't realize that Sac City made that. Will consider on the next time I do that job (probably on my swapped 5.3 on my 99 Silverado as I think that's also starting to seep too).

I used a generic one from Amazon: JGR LS Engine Billet Aluminum Oil Diverter Barbell Galley Plug Fits GM Gen III & IV LS Engines LS1 LS2 LS3 LS6 LS7 LS9 LQ4 LQ9 4.8L 5.3L 6.0L 6.2L Silver https://a.co/d/5mjAq9r

 

[Trilla_one]

Nice. Mine is due too. Wish I knew an independent mechanic who worked out of his house or for a GM dealership

 

[zissou]

Are those the Cadillac CTS brake calipers?

They are the PPV 16" brakes. Had them for a year now and still love them.

Been just chipping away at this after work this week. Got the trans bolted back up with a new torque converter. Transfer case went back in with a new output shaft seal (89059495). There's a chance it all gets wrapped up tonight.

 

[Geotrash]

Haven't had to do much maintenance this last year ever since resealing most all of the engine gaskets, but still had a small leak from the rear seal. Finally pulled the trans today. This week I'll be putting on a new rear cover/seal, new torque converter seals (24237531 & 24219390) and a new torque converter for good measure. Also doing a new barbell on the rear of the engine while I'm in there. Should finally be leak free after this.

242k miles on this 2007 Denali. Deleted the VVT about a year ago and put in a small cam. Probably will be selling the truck this Spring as I just picked up another, an 08 Escalade ESV in Pearl White with only 140k.

Are you sure you still have VVT enabled on that engine? The back of that cam says Cam Motion and I'm 99% sure they make only 3-bolt cams.

Hard to make out the specs but it looks like it might be their Stage 2 Truck cam based on the 212 & 220 that I can see - most likely the 'drop-in' version:

6.2 Stage 2 LS Truck Camshaft (212/220-117+5)

Superior high performance LS & Gen 5 LT camshafts for GM cars and trucks equipped with LS1, LS2, LS3, L99 & new LT engines.

cammotion.com

 

[89Suburban]

They are the PPV 16" brakes. Had them for a year now and still love them.

Been just chipping away at this after work this week. Got the trans bolted back up with a new torque converter. Transfer case went back in with a new output shaft seal (89059495). There's a chance it all gets wrapped up tonight.

Can you post pics of the old seal so we can see how a "bad seal" looks?

 

[zissou]

Are you sure you still have VVT enabled on that engine? The back of that cam says Cam Motion and I'm 99% sure they make only 3-bolt cams.

Hard to make out the specs but it looks like it might be their Stage 2 Truck cam based on the 212 & 220 that I can see - most likely the 'drop-in' version:

View attachment 419153

6.2 Stage 2 LS Truck Camshaft (212/220-117+5)

Superior high performance LS & Gen 5 LT camshafts for GM cars and trucks equipped with LS1, LS2, LS3, L99 & new LT engines.

cammotion.com

Yes, it is a drop in 212/220 version. The front of the cam is 3 bolts despite what the rear looks like. VVT was deleted.

 

[Geotrash]

Yes, it is a drop in 212/220 version. The front of the cam is 3 bolts despite what the rear looks like. VVT was deleted.

Got it. My mistake - I misunderstood your first post. Sorry about that.

 

[Larryjb]

Can you post pics of the old seal so we can see how a "bad seal" looks?

This was mine. The RMS itself probably wasn't leaking much if at all. It was the rear cover that was leaking so much. Once i had the cover off the gasket was so compressed there was no way it could seal properly anymore. New RMS and gasket has been on since June 2020 and no leaks. (Still need to do the front seal though. But rear bearings are more important now.)

 

[89Suburban]

This was mine. The RMS itself probably wasn't leaking much if at all. It was the rear cover that was leaking so much. Once i had the cover off the gasket was so compressed there was no way it could seal properly anymore. New RMS and gasket has been on since June 2020 and no leaks. (Still need to do the front seal though. But rear bearings are more important now.)

Just like the VLOM gaskets that go bad. Very interesting. Appreciate you posting this and the pic.

 

[donjetman]

@Larryjb
If anybody wants pictures (especially post #15) of a rear main seal job and part #s see my thread from late 2018:
https://www.tahoeyukonforum.com/threads/rear-main-seal-job-pan-etc-07-yukon-denali-6-2.108334/

 

[zissou]

This was mine. The RMS itself probably wasn't leaking much if at all. It was the rear cover that was leaking so much. Once i had the cover off the gasket was so compressed there was no way it could seal properly anymore. New RMS and gasket has been on since June 2020 and no leaks. (Still need to do the front seal though. But rear bearings are more important now.)

Same story here too. The RMS itself was probably fine, but the gasket was flat. I had a small leak from the cover gasket combined with a small leak from the torque converter seals. The transmission shaft o-ring (24219390) was rock hard and felt like plastic and the torque converter seal (24237531) had signs of leaking due to some grime inside the bell housing behind the torque converter.

Got the truck started last night and so far so good, no leaks after idling for about 30 minutes.