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GT40 Tech - Powertrain/Transaxles Transaxles and driveline - don't dare post engine things here!

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Old 29th October 2017, 12:39 AM   #1
Pete Woodward's Avatar
Pete Woodward
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GT40: DRB Mk1
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Trans Ratio's

Hi Gents
I know there has been a lot of discussion around gear ratio's but I would like some feed back on what you think is the best final drive ratio for the street.
I'm running a Porsche G96 3.44:1 on 25" rubber. Although I haven't done many miles it just seems too low. So before I shell out for a new gear set I would appreciate you experiences
Cheers
Woody
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Old 29th October 2017, 03:57 PM   #2
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Re: Trans Ratio's

Which variant of G96 do you have, 3.44/1 R&P is tallest factory on list I found, but there are 6th gear ratios from ,75 .82, .85, .86.... Part number G96-.... is critical.
R&P is only part of the equation.
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Old 29th October 2017, 07:44 PM   #3
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Re: Trans Ratio's

Thanks for the reply Jac
Mine is a 2005 G96 / 96 GT3. CMS said they could supply a 3.1:1 at a cost of $3950 US. I need to pull the trans out to replace 5th gear synchro's so I will check all the ratio's as I'm starting to doubt the info given to me with this trans.
Woody
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Old 29th October 2017, 10:41 PM   #4
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Re: Trans Ratio's

Quote:
Originally Posted by Pete Woodward View Post
Thanks for the reply Jac
Mine is a 2005 G96 / 96 GT3. CMS said they could supply a 3.1:1 at a cost of $3950 US. I need to pull the trans out to replace 5th gear synchro's so I will check all the ratio's as I'm starting to doubt the info given to me with this trans.
Woody
According to the chart I found a G96/96 would/should have a 0.85 6th, Assuming the ratios interchange you would have 0.82 & 0.75 6th gear options. Your current 6th with 3.44/1 R&P will give 2.92/1 while 0.82 is 2.82/1 and 0.75 is 2.58/1. 25" OD seems a bit on the small side for a GT40 in the 'looks' dept to me. gboxweb.com/gt2specs.html
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Last edited by jac mac; 30th October 2017 at 05:54 AM.
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Old 30th October 2017, 10:23 PM   #5
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Pete Woodward
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Join Date: Jan 2010
Location: New Zealand
GT40: DRB Mk1
Posts: 207
Re: Trans Ratio's

Hi Jac
Thanks for your time it is appreciated
yes your right, gear ratios you mentioned are the same as the chart I was given with the trans ( attached ) however the chart says at 3000rpm I should be going 78 mph but its just on 60 mph.
So I could change 6th gear but all the gears need to come up so yes a tire size increase is in the plan as they are getting old and hard now. But I don't like my chances of dropping 600 - 800 rpm with a tire change.
I'm not unhappy with the "look" or stance what do you think.
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File Type: pdf Spr09cws17103110470.pdf (731.5 KB, 30 views)
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Old 30th October 2017, 10:37 PM   #6
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Pete Woodward
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Posts: 207
Re: Trans Ratio's

I will try again to attach picture of the car need to resize files

Last edited by Pete Woodward; 30th October 2017 at 10:38 PM. Reason: trying to attach pics
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