putting feelers out for used gears, anybody have any leads? Options

[Aaron Cox]

ask and ye shall recieve....

[brant]

Joe,

so the T gear is 1:1
26 teeth on each half.
and the 2 halfs probably need to stay together as a set and never get mixed. They wear into each other and I think mixing a "set" would probably be real bad.
so I don't think you have a T in your stash.

I'll have to research more about which part of the set would have the dog attatched to it for a T

normally its easier to say that the associated dog is on the big or the small half of the set, but the T has 2 equal parts to its set.

I'll figure out if the 3rd gear position O or the 4th gear position O has the dog on big or small

thanks all.
brant

[brant]

can someone answer this question:

regarding a 3rd gear "O"
versus a 4th gear "O"

how do you tell the difference.

I'm only guessing... but usually, the attatched dog is on the first part of the set. The teeth are 23/28 for each type of "O"

I'm assuming the 3rd gear type would have the dog teeth on the 23rd tooth part

and the 4th/5th type would have the dog teeth on the 28 tooth'd part.

Is that correct?

brant

[groot]

From memory... so it may not be 100% accurate....

For 4th and 5th the driven gear has the dog. For 3rd the driving gear has the dog, which is why you can move a 5th to use for 3rd.... which puts the dog away from the engine. The 5th doesn't actually get flipped, just swapped.... driven to driving gear. The dog still faces down because 3rd and 2nd use the same shift fork.

4th and 5th share a shift fork, so the dog is on the inside of each driven gear, which is why you can't use a 4th gear as a 5th gear, the dogs on on different sides of the driven gear. (I might be wrong on this...., maybe you can flip them and run the gears backwards.)

Thouroughly confused????

To directly answer your question about the "O" gear:
A 3rd "O" would have the dogs on the driving gear.... the one with 23 teeth
A 4th gear "O" would have the dogs on the driven gear.... with 28 teeth.... and so would a 5th gear "O", but the dogs would be on the other side of that same gear

I think I have a 3rd and 4th gear "O", but I'll have to check tonight to make sure.

[brant]

Kevin let me know what you find.

I always thought that the 4th and 5th were completely interchangeable because the dog was on the same side (forward facing in a teener) and either could slide into the other's space.

but that the 3rd and 4th were not interchangeable (unless flipped)

now I'm good and confused.
brant

[Aaron Cox]

QUOTE (brant @ Aug 16 2005, 12:59 PM)

now I'm good and confused. brant

me too....

i forgot to take into consideration the location of the dogs.... (IMG:http://www.914world.com/bbs2/html/emoticons/screwy.gif)

[groot]

Here's what I have... that I'm willing to part with.... most are bare gears.

H, 2nd (hell, I don't even have a 904 mainshaft)
O, 3rd
N, 3rd
N, 4th
M, 4th (I think it's a 4th)
V, 4th (stock)
ZD, 5th (stock)

I don't think you can interchange 4th and 5ths so easily, but there are plenty around here who know more than I about these transmissions. See, the 4-5 slider goes between 4th and 5th, so the dogs have to be located between the 2 gears. So, the dog is on the engine side of 4th gear and on the opposite side of 5th. Maybe you can flip them??

[Red-Beard]

Just remember, not everythinig is swappable from any position to any position.

Also remember that on a 4 spd 901 transmission, you should "think" of it's 1st-4th as being 2nd-5th in relation to our transmissions.

3rd and 5th are invertable....2nd is usually non movable. For AX, you want to be shifting between either 2nd and 3rd or between 4th and 5th, for fastest shifting.

http://members.rennlist.com/chuxter/901&915ratios.htm

James

[Red-Beard]

4th and 5th can be interchanged, but are not invertable. 3rd can be swapped into 4th or 5th positions, but the gear ratio will be inverted (H becomes a very long gear). There is more than 1 "H" gear. Be careful to get the gears that will work in your positions. See the chart in my last post.

[brant]

I'm waiting on a spreadsheet from a guy to double check my computations.

but here are my long hand figures:

1st choice: F, K/L, P, T, W
Gear 1 2 3 4 5
RPM gap 1,723 1,334 1,054 801
MPH gap 61.5 19.0 18.0 16.7 14.2
Max mph 61.5 80.5 98.5 115.2 129.4


2nd choice: F, J, O, S, V
RPM gap 1,529 1,284 1,075 772
MPH gap 61.5 16.3 16.6 16.3 13.1
Max mph 61.5 77.8 94.4 110.7 123.8


brant