French Trailblazer reborn

[Jeantalus]

@TollKeeper if I'm correct the kit you linked is for an open diff ? I have a doubt about fitting for G80 equiped diff ....
For the half shafts bearing I'm sure the shaft are ok, the chineese bearing I removed have an outer race diam about 70,95mm whereas OEM are 71,2 that's why it was free in the tube, I'm gonna put OEM bearing with some PTFE based varnish in the scored and around the race , I know this product because I use it in aeronautics.

 

[TollKeeper]

I am not sure if there is a difference for the 2 spider gears you need open diff to a locker... Have not had to deal with that specific issue. @Mooseman might be able to answer the question. @gmcman dealt with helping another member in another thread, but no part numbers were given..

 

[Mooseman]

Online microfiches don't specify however they do list the same part number between the 4.2 and 5.3 so I would assume they are the same. However, they are like $300USD or $530CAD. Insane! And one site says they are backordered so may be unobtainable.

Best bet is a used set. I do have an 8.6 G80 carrier sitting in my garage I've had for years as a spare. I could pilfer the gears from it for you.

For the axle bearing and seal, I'm sure I can find a quality aftermarket like Timken to send along with the gears. The GM parts are overpriced.

 

[Jeantalus]

@Mooseman don't split a spare diff for me, you may need it one day. If someone have swapped and have an 8" with spiders ok it would be better. For the bearing I think I can find good quality Timken right here in France.

 

[Jeantalus]

Decided to go ahead and disasemble the pumpkin to see if all other parts are serviceable and decide if this 8" worth a nex set of spider gears,



Here is the sick one


my question is, on the ride plates pack , they look shinny and mostly smooth:



and on the left pack, side with slotted device under pignon to get pressure on plates, they look more rough



So , anybody have an experience with those parts and could tell me if they're ok or not ?

Thanks community !!!!

 

[Mooseman]

Haven't heard of anybody rebuilding one of these. Here, we have the luxury of replacing the whole differential for cheap. Honestly, I didn't even know the G80 had clutch packs . If you replace the entire carrier (or pumpkin), then you'll need to check gear contact pattern for backlash and depth.

Ring and pinion look OK. Do you off-road a lot? I can't see why the clutch packs would wear out like that.

If you want, I could find a complete carrier for you but as you can imagine, the shipping cost will likely be outrageous. Another alternative would be to get the complete carrier and take it apart to take only the needed parts to ship.

Found this article and it lists the part numbers. Unfortunately, for the 8.0" rear, parts are no longer available from GM Canada but seems to be showing as available from the US

Rear Axle G80 Differential Rebuild | offroadTB.com

offroadtb.com

Parts needed are:
12479036: left clutch pack ($221)

2002-2012 GM Driver Side Complete Locking Differential Clutch Disc Set with Guides and Washer 12479036 | GMPartsDirect.com

2002-2012 GM part # 12479036 - Driver Side Complete Locking Differential Clutch Disc Set with Guides and Washer

www.gmpartsdirect.com

12479037: right clutch pack ($89)

2002-2012 GM Passenger Side Complete Locking Differential Clutch Disc Set with Guides 12479037 | GMPartsDirect.com

2002-2012 GM part # 12479037 - Passenger Side Complete Locking Differential Clutch Disc Set with Guides

www.gmpartsdirect.com

So you're looking at a minimum of $300USD + shipping.
The site may be misleading as a lot of times, they list a price but they are actually NLA, like in Canada. And that's not including the spider gears.

 

[Jeantalus]

Thanks @Mooseman for the time you spend on my case.

I've already read the thread on ORTB about the G80 rebuild, I've spent hours searching about G80 parts.

The parts are available on rockauto, but the prices are insane !!!!



Looking at the new clutch discs, I assume that mine are really worn, and I don't want to rebuild a diff with a cost exceeding 700€ - 800€ with shipping and customs dues.

Bet performances sell rebuilt 8" with G80 or POSI , 350USD + 163USD shipped to my door.
Maybe gonna consider it.

I've given a call to a french junkyard, they have a 4.2 TB with rear axle still on, I've told the guy to check the diff teeth, I'm now waiting for his quote.