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Discussion Starter · #1 ·
So can anyone help with my dilemma:

The gearbox has started getting noisy on my 94 9000i. The noise is constant in each gear and if you coast in neutral, It's not a wheel bearing but is speed related. I have two options. I can have a second-hand box fitted from a ftp so the ratios may be different, can anyone confirm this? The box is supposedly good and carries a 3 month guarantee. I trust the company that is coning to do the work.

Alternatively a gearbox specialist will have a go. they reckon it is probably just a bearing and will also cost £400 but could be more depending on what they find.

I just hope it isn't the pinion shaft
 

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I'm assuming it is a manual. I don't know about the 2.0T, but the '93-on 2.3T had a much higher final drive than yours. Imagine taking it to 70mph in 2nd gear, then dropping it into 5th and cruising along at just over 2000rpm. While this makes for relaxed driving with the 2.3T, I would think a normally-aspirated 9000 might struggle due to the lack of low-down torque.

If you decide to rebuild, it might be worth speaking to someone like Abbott Racing. I don't know for certain how much they would charge, but I do know they charge £720 for an LSD and £920 for an LSD fitted including a rebuild. Work out the difference, then Add a bit to compensate for the fact that they're not making an LSD sale and it's still competitive. They really know what they're doing too.
 

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I just hope it isn't the pinion shaft  [/b]
Do 9000 boxes have pinion shafts?

They have an input and output shaft which both run on taper bearings and are pre-loaded.

The outer output shaft bearing do fail, but can be changed with the gearbox in the car (just)

Andrew
 

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Hi Rob

No, quite the opposite - the revs are lower at motorway cruising speeds - but the zap is still there, just in a lower gear. I'm quite happy after the transplant and it was a cheap fix. I suppose it depends what kind of driving you do most (no mountains here, and no speed limits just over the border

David
 

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Andrew,
There's what's called a differential actuator, which runs through both pinion gears. On earlier models, the gears have wear discs at their ends, but only later versions ('97 & '98, I believe) they started using needle bearings.
 

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On earlier models, the gears have wear discs at their ends, but only later versions ('97 & '98, I believe)  [/b]
Except maybe these ones?

Version 4:
GM75701
'93 CST, CSET and Aero
3.61:1 final drive with *needle bearings* behind spider gears
Front dipstick for level checking and filling.
Large inner driver.

Version 5:
FM751xx
'94 CST, CSET and Aero
3.61:1 final drive with *needle bearings* behind spider gears
Reverse-gear synchro, and revised synchro and selector function throughout.
Fill plug, level plug, drain plug, no dipstick.
Large inner driver.
 

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Andrew,

I didn't realize that earlier models had the needle bearings. Maybe you can answer this for me: what's the distinction between spider and pinions? The beveled gear that's on the same shaft as the final drive gear and the one directly opposite it that connects to the intermediate shaft - they're pinions? That means what I was earlier calling a differential actuator is really the differential shaft. It runs perpendicular to the centerline of the pinions and the final drive gear and has two smaller beveled gears at each end. Those two smaller gears must be what Saab calls the differential actuators?
 

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Andrew, never mind. I've figured out that the spider gears are what saab calls the differential actuators. Makes sense to be called differential actuators because they're the ones that spin freely and allow the addition or subtraction of speed.
 

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Discussion Starter · #11 ·
Thanks for all the advice. I’ve booked the car in with a local gearbox specialist, they have driven the car and reckon it may only be a bearing so I’ll take the chance that nothing else is amiss. I’ve had a 900 box overhauled in the past and been pleased with the result.

BillJ, I’m sure you right about Trents but they’re just too far away.
 

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Good to hear you are getting it sorted.

Originally posted by RobS:
[qb]BillJ, I’m sure you right about Trents but they’re just too far away. [/qb][/b]
I think it was Abbott I mentioned rather than Trent. They're rather far away from me too, but that didn't stop Giles coming to pick up my Aero on Thursday. He also told me he was going down your way (Ringwood) for a pickup or delivery (can't remember which) that night. That's what I call service.
 

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Discussion Starter · #14 ·
So I've just got the car back with new bearings in the box and the obligatory slave cylinder, this cost £550 all in and I'm happy with the result.

As other posts on the board suggest the 9000 box is basically reliable (certainly better than the c900.

The failures the workshop had seen in the past had been the result of poor maintenance and oil lost. Mine appears to be a bit of a mystery as there was plenty of oil in the box. The failure was caused by a spacer collapsing allowing 2 bearings to touch.
 
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