12th July 2007, 10:35 PM
attached are some pictures of the old saab crush sleeve vs.the new saab crush sleeve that also cross references to the gm cobalt crush sleeve. the new design appears more capable than the old one as the cross section throughout the unit remains more consistent and larger than the older design. i'm afraid time will tell just how much better the new design is. was just curious on the differences between the two and wanted to display them for others.
old vs. new
13th July 2007, 09:10 AM
Yeah, for those of us who don't rebuild our transmissions monthly. :lol: j/k but seriously what does it do? :confused:
14th July 2007, 03:00 PM
item number 26 (formerly 24 and 25) is the crush sleeve. this sleeve is located on the output shaft of the transmission and maintains (or tries to maintain) bearing preload. once a transmission is disassembled for any reason...a new crush sleeve is mandatory.
29th July 2007, 07:07 PM
I'm going to find out how they last as my box has just been rebuilt about 4 times:(
Had troubles getting reverse, box was removed & stripped, rebuilt with all new bearings etc, then garage found whine that wasn't there before rebuild, so same process again, found broken bearing carrier caused by broken bearing somewhere else in box, rebuilt, refitted, tested, worked fine until they tried to park it after test, no reverse.
Removed again,rebuilt again with all new reverse bits etc on, same problem.
Then it was removed again and taken to gearbox specialist. They found that a groove on main shaft was rounded off, so it was machined & repaired.
Has been fine since then.
Garage had to use new set of crush bearings each time it was stripped, thankfully they recognised their mistake in missing broken bearing carrier at beginning so I didn't have to pay for any work past initial repair.
Time will tell if it lasts.
Feels much smoother & tighter than before so hopefully is OK for another 140k
29th July 2007, 10:05 PM
I used the Colbalt Crush sleeze for my rebuild, you have to watch out Saab dealers may still have stock of the old ones and might try to pass one along to you if you go to buy it there ( they did at my local saab dlr, got one from a Chevy dealer)
26th March 2008, 10:01 PM
Dumb question... does anyone have a part number for the Cobalt crush sleeve? I'm rebuilding the tranny on my '97 Aero and I figure I'd do better at the Chevy dealer with a partnumber rather than a lengthy story about how I'm trying to stuff a Chevy part into my Saab transmission... :cool:
27th March 2008, 11:13 AM
This is why there are replaced in the later gearboxes. Originally they were too soft so and would yield under use and loose preload on the bearings. This makes the shafts less rigid. The later ones like this were harder steel but you can see the simply fatigue crack and then fret, same loss of preload. The new one used since -03 it is not a "cobalt" part.. ;) It is what is used in the newer Saabs from -03 If you order the correct one you will always get the right part. There is no mixed up stock. ;) Local dealer might not know what interchanges.
The new part is #55352125 (http://www.genuinesaab.com/pricing/index.php?part=55352125&Submit=Submit)
Just make sure to get the preload set right when you go back. This is the key to shaft stiffness and trans durability. But if too tight you will overload the bearings when cold.
28th March 2008, 08:59 AM
Thanks for the info!
When you say set the preload "right", is that as per the book or is there an alternate method you prefer?
28th March 2008, 11:23 AM
Since the gears/shafts are steel and the case is aluminum with the differing expansion rates the stock preload is assuming normal service use and a compromise for the lower output. When you run these hard like on the track or hook it to a 450hp engine it takes a different preload since generally the stresses will be higher and the box will heat up more.
For your 9000 just set it on the tight side of factory. 1.2nm or something final.
9th May 2009, 04:28 PM
Can anyone explain how to set the preload for a 9-5 for normal usage? I have a 2000 Aero and am thinking of rebuilding mine. I've never done it before and have been discouraged by a lot of people. I've been told you need special tools, it's hard to preload the bearings etc.
Any light someone can shed on this would be appreciated.