what gears best for v8, h for 5th but what about 3rd and 4th ?? Options

[jimkelly]

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

[ArtechnikA]

here: Charlie White's Gear Page is a chart of all the ratios for all the boxes.

H is nominally a 3rd gear that can be flipped (drive gear becomes driven gear) so 19:32 becomes 32:19. H is actually the shortest 3rd which means it becomes the tallest top when flipped - unless you want to get into the 2nd (E, F, and G-series) gears. But those are really rare (motorsports) items since interchangeable 2nds means a 904 mainshaft (bring $$$).

You could consider flipping a first gearset but the tallest of those (D) is 16:35 which would be 35:16 flipped and REALLY tall - like Diesel territory... (if the stock /4 ZD top is ~.7 a flipped D would be .45...)

H really is about as good as it gets in a 901 box... You can look around for a GB set but it'd be quite the coup to snag one...

[realred914]

here: Charlie White's Gear Page is a chart of all the ratios for all the boxes.

H is nominally a 3rd gear that can be flipped (drive gear becomes driven gear) so 19:32 becomes 32:19. H is actually the shortest 3rd which means it becomes the tallest top when flipped - unless you want to get into the 2nd (E, F, and G-series) gears. But those are really rare (motorsports) items since interchangeable 2nds means a 904 mainshaft (bring $$$).

You could consider flipping a first gearset but the tallest of those (D) is 16:35 which would be 35:16 flipped and REALLY tall - like Diesel territory... (if the stock /4 ZD top is ~.7 a flipped D would be .45...)

H really is about as good as it gets in a 901 box... You can look around for a GB set but it'd be quite the coup to snag one...

so is teh H gear simply teh third gear turned backwards? i heard that a 911 style tranny was the source of the gear needed, can teh 914 tranny third gear be turned backwards in place of fifth, will that result in the correct fifth to lower rpms for a larger motor?


thnaks

[ArtechnikA]

so is the H gear simply the third gear turned backwards? i heard that a 911 style tranny was the source of the gear needed, can the 914 tranny third gear be turned backwards in place of fifth, will that result in the correct fifth to lower rpms for a larger motor?

Have a look at the link I posted - all the answers are there.

H is _a_ 3rd gear turned backwards. It is not from any 914 (4 or 6). So yes - it will have come from a 911/912/Motorsports bin.

A 914 3rd gear (4 or 6) flipped won't gain you much - they're at the 'tall' end of the available 3rd gears and are pretty close to 1:1. In fact, a flipped 914/4 3rd is actually shorter than the stock 5th - so that's the wrong direction...

[realred914]

so is the H gear simply the third gear turned backwards? i heard that a 911 style tranny was the source of the gear needed, can the 914 tranny third gear be turned backwards in place of fifth, will that result in the correct fifth to lower rpms for a larger motor?

Have a look at the link I posted - all the answers are there.

H is _a_ 3rd gear turned backwards. It is not from any 914 (4 or 6). So yes - it will have come from a 911/912/Motorsports bin.

A 914 3rd gear (4 or 6) flipped won't gain you much - they're at the 'tall' end of the available 3rd gears and are pretty close to 1:1. In fact, a flipped 914/4 3rd is actually shorter than the stock 5th - so that's the wrong direction...

Thanks that is the info I need. i guess I need to find a used 911 / 912 tranny now to get the gear. That is a four speed tranny right? any particular year models to look for to find the H gear?

[ArtechnikA]

...That is a four speed tranny right? any particular year models to look for to find the H gear?

This will have to be your research project - I can't be doing your homework for you...

Find or buy a copy of PET/ETKA. It has all the part numbers and all of the applications for all of the production cars.

'H' could have been a 4-speed or 5-speed transmission gear. It might have been a 'special order' or Porsche Motorsports gear. (I just don't know, and I have no reason to research it.) Now that you know what you're looking for, search here. This topic has come up before, including sources for vintage parts.