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Posted by: Aaron Cox Oct 18 2004, 11:21 AM

curious, what does this do?

lower rpms in 5th?

curious

Posted by: bondo Oct 18 2004, 11:24 AM

3rd is 23:29 5th is 31:22. Flipping 3rd and usuing it as 5th would give you 29:23, whuch would give you higher RPMs in 5th.

Posted by: Aaron Cox Oct 18 2004, 11:27 AM

bummer. i need to drop tranny sometime and replace seasl (leaks moderately - shifts great) i am running 50 series falkens, and im pulling like 4k on the freeway goin about 80. drives great, was wonderin what this gear swap did while i am doin tranny stuff

Posted by: bondo Oct 18 2004, 11:31 AM

I have an H gear for sale (shameless plug) that will get your highway RPMs way down. The price is dropping very soon.

Posted by: skline Oct 18 2004, 11:33 AM

So 5th gear in a stock 901 is a ZD? I thought it was M. Now I am totally lost.

Posted by: Aaron Cox Oct 18 2004, 11:35 AM

im clueless about this tranny stuff. its a "while im in there thing" , probably something i can do myself?

Posted by: bondo Oct 18 2004, 11:42 AM

It's not an easy thing to do, but not impossible either. You'd need Red-Beard's article, my picture article that's in the classics, and the factory shop manuals. Take your time, keep track of what goes where, and it's do-able. You'd probably want to rearrange your existing gears so the jump from 4th to 5th isn't too big. Typically the thing to do (for V8s anyways) is to put the flipped H gear where 5th was, put 5th where 4th was, take 4th, flip it, and put it where 3rd was, and take out the old 3rd.

Scott: all 5 914 transmsissions I took apart had the following gears:

1st: A
2nd: F
3rd: N
4th: V
5th: ZD

Posted by: TimT Oct 18 2004, 12:33 PM

M is typically used as third

Posted by: propricer Oct 18 2004, 12:49 PM

Stock 914 901 gearing is A-F-N-V-ZD where ZD is 31:22.

Using the H ( 19:32 ) gear in place of 5th will drop your highway RPMs down to less than 3,000 RPM.

Also, there are other H gears such as the HA ( 20:32 )and the HB ( 19:31 ).

Posted by: Aaron Cox Oct 18 2004, 12:52 PM

so putting a 5th in the 3rd spot gives you a taller 3rd?

so it sounds like i want a 5th for 3rd, and a stock 5th or an Ha gearset

or i could just buy a 55 series tire next time

Posted by: skline Oct 18 2004, 12:54 PM

I got this gear chart calculator from Carquip, its pretty cool and tells what speed and everything you would get with any size gears or tires. Pretty interesting. I will see if I can attach it.

ok, it wont let me attach it. If anyone needs it, I can send it to you in an email, PM me for it.

Posted by: Cloudbuster Oct 18 2004, 01:16 PM

The swap moves 3rd and 5th lower.


Attached image(s)

Posted by: Bleyseng Oct 18 2004, 01:59 PM

I swapped the 3rd and 5th gears and I love the flipped 5th gear in 3rd place but the 3rd gear in 5ths place sucked for a street/AX car. I stuck another 5th gear back in to 5th gears spot for a nice close ratio box that you can still freeway drive.

I run 205x50's also

Geoff

Posted by: Mueller Oct 18 2004, 02:18 PM

for a stockish /4 motor, i thought Jake thinks that 5th gear is too tall and that the /4 motor benifits from running at a higher rpm (for cooling) so your current tire choice might be okay..

Posted by: bondo Oct 18 2004, 02:19 PM

But imagine the gas mileage benefit of running an H gear! (you would definitely need to downshift on even the slightest hill though)