UKSaabs

I'm afraid that the cogs are a custom part. There are three parallel chains, but the cog teeth have been machined into the same lump of iron. We just dismantled a gearbox with my friend yesterday, so I can take pictures of the primary at the garage later today if I remember.

Nothing impossible to make though, but I guess you'd have to order quite a few to make it worthwhile.

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9-5 Aero Wagon '02|9000 CC 2.3T '92/'96|900 4D Finlandia T16A '82/90|900 2D T16 '89/91

Another interesting angle on this is the way the power is delivered on different models. My NG900 has what apperars to be the same 5th gear as my old c900 T16 but it doesn't pull as hard when you put your foot down at 70 due to the way the T5 engine management has moderated the midrange power - I have to drop down a gear to pull hard even with stage 3.

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Past Saab enthusiast - present Saab owner.
58 TTiD Sportwaggon

Going to have a look at my G reg carly and K reg this weekend so will report back on which they have. Both the same i would presume. type 8s would be a nice thing.

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Black 1980 99T 2dr S Airflow
Black K 900 T16S Airflow
Black G 900 Carlsson
Black J 9000 2.3 Carlsson

will save you the trouble, here one shamelessly stolen from an ad in the classifieds



Now although the cogs are indeed all on the same piece of metal, is there a need for this to be replicated? Surely as long as the cogs are fixed very securely (bolted/welded) so they all turn together, there isn't a problem.........coupled with a wider steel primary housing, they could be made thicker, and therefore stronger


why should it need to be made? Think we could pass this to some motorcycle enthusiasts......in the big wide world of bikes, there must somewhere be a set of cogs with the right properties, just need to find them and bolt it all up

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Rich
CC Carlsson - shhh! The colour's a secret
CSi - midnight blue

I'm curious as to why you think you need to make them stronger Rich?
Not a common failure of c900 boxes (the primary chains) afaik.

G

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Ex c900 T16s, NG 9-5 TTiD Aero
1/3 9000 track hack
03 VX220 Turbo
93 9000 Aero (Abbott + 80k miles!)

at the moment I'm exploring possibilities, probably the original chains are good enough....but I don't know how far they are rated. Think I may have seen a rally box with quadruple chains and thought 'thats a handy bit of kit'.
It's all just thoughts in my head, mainly turning into plans for my rebuild/restoration.....I know that there are many different points of possible failure within the gearbox that make the unit as a whole the major problem for a tuned c900. I don't know about going for a lottery-winners spec box, but if the car ends up with as much power and torque as I'd like, it will need something pretty special. I also figure that if the box is going to have to be built up out of pricey bits, then I'll do everything properly 1st time round - in an attempt to give it some longevity, and save hoisting it out every week......it'll probably still die spectactularly!!!

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Rich
CC Carlsson - shhh! The colour's a secret
CSi - midnight blue

Ok both my 900s have type 7 primaries. K reg and G reg turbos. the codes are GM55706 and GM55704. Does anyone know why the last digit is different between the two cars?

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Black 1980 99T 2dr S Airflow
Black K 900 T16S Airflow
Black G 900 Carlsson
Black J 9000 2.3 Carlsson

No problem using my photo's, here is another one you can steal
The primary gears are really quite strong and so are the chains, as long as they are not too stretched and worn, the weak point is the aluminium spigot that the top gear fits on, with high power/torque and abuse, this can shear. On the early 99's the primary drive was cogs and a shaft, even on standard cars these could fail, hence Saabs change to sprockets/chains. This is the front cover from Will Gollops 99 4-speed rally cross box, this had 4 chains and a grafted on bearing to give extra support.

The last two digits refer to the development of the gearbox.

GM55704 is from a T16 and will have gears designated to the 1989-90 gearbox.
GM55706 is also from a T16 but with cat and also 900i and 2.1 and has gears designated to the late box 1991- 1993.

I am about to start my stash of spare gearboxes for the Chavmeister so as I scrap some of the cars in the garden, I shall be taking out known good boxes.

As I have no idea whether the boxes in the cars are original, and particularly when I have a pile of removed boxes, is there a full list of c900 gearbox types that those two come from? It would be most useful...

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UKSaabs - Now the busiest (and best) Saab forum in the world thanks to our members.

5th gear on mines does 30mph @1000 rpms IIRC, I will take a picture the next time I do 70mph to double check what type 8 do, I need to buy a Tom Tom to really know for sure what the speed is though.

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Anderson Silva Bolt

Yes there is. The pictures I'd have provided, but naturally forgot to take would have illustrated the construction of the upper cogwheel assembly.

There is a large bearing + loose circlip inside the cogwheel that are held in place with another circlip on the inside edge. You will need to make a similar construction, else you will need to invent your own fittings for the cog.. I personally am not interested in that kind of approach, I just want an 8 primary, not hours of metalwork..

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9-5 Aero Wagon '02|9000 CC 2.3T '92/'96|900 4D Finlandia T16A '82/90|900 2D T16 '89/91

Nick, just post up the gearbox codes of what you find and i'll try to help.
Basically there are 4 types of gears fitted to the 5-speed C99/900, up to 1980, 1981-1988, 1989-1990 and 1991-1993. Final drives are 9:33 up 'till 1988 and from 1989- 9:35.
Then there are the primary gears, type 4= 31:30, type 5= 30:27, type 6= 31:26, type 7= 32:25, type 8= 33:24. To add to this there are quite a few motorsport primary gears and final drives, both 4 and 5 speed.

just back from a drive in the car on work duties......

with my LPT source 5spd, and Type 8 Primaries, at 2500rpm the sat nav was reading 62mph

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after 7 years together, Saabarella is being broken :-(

The answers to the majority of questions in this thread have been on Widde's site for years.

http://900aero.com/main/tech_main_tranny.htm

Thanks Si, I keep forgetting about this great site

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UKSaabs - Now the busiest (and best) Saab forum in the world thanks to our members.

I forgot about that as well, I think I have the tallest gearing on my 900


Year Model Gearbox number Final gear Total gearing 1 2 3 4 5 reverse

1990 900 T16 GM55804 9:35, 3.89 12.88 -7.49-4.91-3.55-2.83 -R 14.17

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Anderson Silva Bolt

<waves> Same as mine.

£500 for a perfectly respectable, MOTd black 3dr T16 with type 8s? I reckon I paid for the primaries & leather and got the rest of the car free...

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Adrian
Back from living life on the road in an old VW
http://WhereverTheRoadGoes.com

This looks spot on to me

This how I think works out in theory for later box at 70mph in 5th with 195/60 15 tyres
Type 6: 3256 rpm
Type 7: 3037 rpm
Type 8: 2824 rpm

If anyone's put type 8's in an earlier (up to '88) box then it should be 2639 rpm but no cars supplied from factory like this. Probably a touch too tall

My old 91 T16 must have been type 08 then after all

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Past Saab enthusiast - present Saab owner.
58 TTiD Sportwaggon