About longer final ratio G96/00 gearbox

[Zarpoxx]

Hello everyone,

I have another question about my Can Am. The car has a gearbox Getrag G96 / 00 with gear ratio of origin, and final group of origin (3.44). With this final gear ratio the change seems almost unusable from first to third (very short), being also the sixth to my taste too short too.

Does anyone know or know where I can buy a final 3.00 or lower final ratio for this box?

In case this is impossible, what do you usually do?

Searching the internet I have only been able to find this company ... but they do not reply to my mail ...

http://www.gboxweb.com/996albins.html

Thank you and greetings.

[Graham-P]

You can try California MotorSport, I got my crown wheel and pinion from them or there's this thread when it was fitted and the post is from a guy who works/worked at GBox.
https://www.pistonheads.com/gassing/topic.asp?h=0&...

HTH
Graham

[Zarpoxx]

Thank you Graham for your help. It is very useful.

Yesterday I mailed CMS and they were very quick to reply and now I have a quote (final group 3.00) with shipping (I live in Spain).

Do you, or any of you, know how hard is (change final ratio) to do by my mechanic? Or I have to look for an gearbox specialist to do the job? How many hours do you think will take?

Thank you

Gisleno

[F.C.]

Zarpoxx said:

Thank you Graham for your help. It is very useful.

Yesterday I mailed CMS and they were very quick to reply and now I have a quote (final group 3.00) with shipping (I live in Spain).

Do you, or any of you, know how hard is (change final ratio) to do by my mechanic? Or I have to look for an gearbox specialist to do the job? How many hours do you think will take?

Thank you

Gisleno

Do you have LSD fitted?

[Zarpoxx]

Good question.

I have to look if it has. Really I do not know.

If it has LSD, makes harder the change?

[F.C.]

Zarpoxx said:

Good question.

I have to look if it has. Really I do not know.

If it has LSD, makes harder the change?

you will need to take care the CMS kit has been known to foul the LSD housing if Porsche item fitted,
you may benefit from fitting a CMS diff which will fit out of the box.
The alternative will be to mill a few mm off the face of the pinion to stop it fouling the LSD.
I would let the professionals do the job as the shims may need replacing and they should have the right compensatory sizes to hand.

[andygtt]

I need to check your G96 is actually the same box as mine (it's the gt2/gt3 version I have), as I have a custom made final drive for it on the shelf that I've never used (and probably never will).

I had it spec'd to give a genuine easy 200+ mph and nice cruising speed in top gear.

[ROWDYRENAULT]

Hi guys: My new Ultima project that I have not spoken on here about yet ( its coming) has a 996 GT2 box installed. Below is a comparison of my old G50-03 with a CMS modified 4th and 5th gear versus the new GT2 box stock and with a modified 1st and 2nd gear

SORRY THE DAMN FILE WILL NOT UPLOAD............ Anyway CMS can modify a GT2 box and others I would assume from a 3.82 1st and a 2.05 2nd to a 3,15 1st and 1.89 2nd this will result in a better situation on the bottom end for a car with the light weight and huge torque potential as the GTR. With the stock 6th gear 70 mph will be 2343 rpm and 80 will be 2678. top speed at 6800 rpm will be 203 I have driven my old GTR with a 3.5 1st gear for many years and many miles and I have always thought that a longer ratio in the first two gears would work well

Edited by ROWDYRENAULT on Sunday 9th April 22:38

[Zarpoxx]

andygtt said:

I need to check your G96 is actually the same box as mine (it's the gt2/gt3 version I have), as I have a custom made final drive for it on the shelf that I've never used (and probably never will).

I had it spec'd to give a genuine easy 200+ mph and nice cruising speed in top gear.

Andy, do you mean the exterior gearbox (measurements)?

What is the final ratio of your custom final drive?

[845ste]

if you have no experience, you do not do it.
It is a very delicate question.
gears must be very precise between them.
otherwise, hiss, and then destroy all the gears, as well as something worse ... during run.....

[Storer]

A comment for those thinking of a longer 1st gear.

If the car is for road use, it is worth remembering the need to drive in stop-start traffic. My G50/52 does 7mph at tickover in 1st. That doesn't sound much but it does require some clutch slipping or 'gapping' the car in front.

With the torque of an LS7 1st is little use (wheel spin big time) so getting into second ASAP is the order of the day. 90mph in second at max revs, so if you 'manage' the clutch slip it is the fastest getaway gear.

Just to add to the thought process.



Paul

[Zarpoxx]

845ste said:

if you have no experience, you do not do it.
It is a very delicate question.
gears must be very precise between them.
otherwise, hiss, and then destroy all the gears, as well as something worse ... during run.....

Yes, I agree. if it is finally done, will do my mechanic, not me.

[andygtt]

Zarpoxx said:

andygtt said:

I need to check your G96 is actually the same box as mine (it's the gt2/gt3 version I have), as I have a custom made final drive for it on the shelf that I've never used (and probably never will).

I had it spec'd to give a genuine easy 200+ mph and nice cruising speed in top gear.

Andy, do you mean the exterior gearbox (measurements)?

What is the final ratio of your custom final drive?

I'm on holiday so just looking at my iPad and thus just relying on my memory, I can't recall what versions of the G96 exist, I seem to remember it was just the GT2/3 or if different versions existed.

I have Both a gt2 and gt3 box and they are G96s, so the final drive I bought fits them... The final drive I had wasn't an off the shelf and is quite long and thus extends the gearing on all gears including 1st... Pretty sure from memory it gives 25mph or less per 1000 rpm in top gear. However I do need to check my files.

I did this as I ran a canam with a 4 speed box and a very long final drive (212mph at 7000rpm) and it was fantastic in all but the top gear as the Rev drop from 3rd to 4th was a bit big imo

[Zarpoxx]

andygtt said:

I'm on holiday so just looking at my iPad and thus just relying on my memory, I can't recall what versions of the G96 exist, I seem to remember it was just the GT2/3 or if different versions existed.

I have Both a gt2 and gt3 box and they are G96s, so the final drive I bought fits them... The final drive I had wasn't an off the shelf and is quite long and thus extends the gearing on all gears including 1st... Pretty sure from memory it gives 25mph or less per 1000 rpm in top gear. However I do need to check my files.

I did this as I ran a canam with a 4 speed box and a very long final drive (212mph at 7000rpm) and it was fantastic in all but the top gear as the Rev drop from 3rd to 4th was a bit big imo

Thank you Andy for the info. Please, contact me when you finish your holidays.

Have fun!

Regards,

[andygtt]

3.1:1 ratio

The G96 has the same bell housing bolt pattern as the old G50's... its basically a beefed up G50 with cable shift and was used in the GT2/3 and the twin turbo 996's.... as long as this is the box you have its the correct one.

[Evolution-ism]

Does anyone know what the HP limits would be on a G96 based transaxle in stock form? I dont intend to get super sticky tires and I want an engine setup that has its torque later in the RPM band instead of in the lower ranges.

And if I push it to the edge as far as HP, whats the first thing to break? Side plates that hold the ring gear?

IE - I have a new Ultima Evo kit coming in a few months, very excited!

[F.C.]

Evolution-ism said:

Does anyone know what the HP limits would be on a G96 based transaxle in stock form? I dont intend to get super sticky tires and I want an engine setup that has its torque later in the RPM band instead of in the lower ranges.

And if I push it to the edge as far as HP, whats the first thing to break? Side plates that hold the ring gear?

IE - I have a new Ultima Evo kit coming in a few months, very excited!

Torque is your enemy, if you have FI and decent management you can map around to some extent and keep the torque levels down a bit.
If you have an open diff I think you will take that out first but if it goes suddenly

[Zarpoxx]

andygtt said:

3.1:1 ratio

The G96 has the same bell housing bolt pattern as the old G50's... its basically a beefed up G50 with cable shift and was used in the GT2/3 and the twin turbo 996's.... as long as this is the box you have its the correct one.

Thank you Andy, I will ask to my mechanic and I tell you something.

[Zarpoxx]

Hi Andy,

It seems that the Final group G96/88 does not fit to a G96/00....

Regards,