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> what gears best for v8, h for 5th but what about 3rd and 4th ??
jimkelly
post Apr 3 2010, 03:17 PM
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since v8's don't use 1st, and second is not interchangeable.

what is the latest thinking on the best gears for 3,4,5 ??

stock is ok - but @ 3000-3500 rpms at @ 65 mph - really sucks the gas : ((

jim
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Dr Evil
post Apr 4 2010, 01:20 AM
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Jeez! $400 for a GA set? I wish I could get that much for them, I have had a few.

There are a few options, all depend on money.

1) Put an H in 5th and call it a day. Easy, fairly inexpensive (compared to other options).

2) 904 main shaft and any 2nd gear set you want to dick with (min $1800 for the shaft alone. Chris Foley may make you one for less, but then you still need to buy the gears for about $400 a set).

3) Find the correct sporto tranz and use the r/p out of it as it is a shorter one that will drop RPM in all gears. I have an incorrect one (wont work as a direct fit in a 901), and I think I know how I can make it work using a 912 intermediate plate to bring the pinon into the diff a little more (PM me if you want to be a guinea pig).

The rest is a colossal waste of time. You will not do better than a flipped H in 5th in a stock transmission.

The gears that Mark was talking about are probably a Z gear which is a stock 5th in a /6 box. The $400 GA set is a stock 2nd in a /6 box and not that rare, IMHO.
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ArtechnikA
post Apr 4 2010, 06:24 AM
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QUOTE(Dr Evil @ Apr 4 2010, 03:20 AM) *

Jeez! $400 for a GA set? I wish I could get that much for them, I have had a few.

It's not a bad price for a mainshaft and a gear, if you need a mainshaft.

QUOTE
3) Find the correct sporto tranz and use the r/p out of it as it is a shorter one...
I think most of us would call that 'taller' but no matter...

QUOTE
The gears that Mark was talking about are probably a Z gear which is a stock 5th in a /6 box.

stock /6 top is ZA (/4 is ZD)

Another but not immediate option is that Guard Transmission is finally making 901 gears. Tell Matt what you want and when demand reaches cost to supply, it can happen. The advantage of this approach is that you can finally have a 'flipped H' ratio with the correct helix.
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Posts in this topic
jimkelly   what gears best for v8   Apr 3 2010, 03:17 PM
ArtechnikA   since v8's don't use 1st, and second is n...   Apr 3 2010, 03:28 PM
realred914   replace 5th with new gear,. move 5th to 4th, 4th t...   Apr 3 2010, 03:52 PM
J P Stein   I have a GA set in the shop. It's F/S ( 400buc...   Apr 3 2010, 03:53 PM
Mark Henry   I have a gear set that I'm about to toss up fo...   Apr 3 2010, 04:49 PM
realred914   I have a gear set that I'm about to toss up f...   Apr 3 2010, 04:59 PM
streetrover   In the midst of a 215 v8 conversion and those soun...   Apr 4 2010, 11:25 AM
jimkelly   http://forums.pelicanparts.com/porsche-911...calcu...   Apr 3 2010, 05:34 PM
computers4kids   Jim, When I rebuilt my 901 at DR. Evils So. clinic...   Apr 3 2010, 09:20 PM
kg6dxn   The PO of my car re-geared my trannny. Not sure wh...   Apr 3 2010, 10:02 PM
JRust   I did the same as Mark. I ust replaced my 5th with...   Apr 3 2010, 10:04 PM
Dr Evil   Jeez! $400 for a GA set? I wish I could g...   Apr 4 2010, 01:20 AM
ArtechnikA   Jeez! $400 for a GA set? I wish I could ...   Apr 4 2010, 06:24 AM
Dr Evil   When I said /6 I meant 911/6. So, a 911 901 box. G...   Apr 4 2010, 08:27 AM
ArtechnikA   here: Charlie White's Gear Page is a chart of ...   Apr 4 2010, 12:45 PM
realred914   here: Charlie White's Gear Page is a chart of...   Apr 4 2010, 01:32 PM
ArtechnikA   so is the H gear simply the third gear turned bac...   Apr 4 2010, 01:41 PM
realred914   so is the H gear simply the third gear turned ba...   Apr 4 2010, 01:51 PM
ArtechnikA   ...That is a four speed tranny right? any partic...   Apr 4 2010, 02:01 PM


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