j-k

I have managed to purchase this gearbox secondhand ...for an excellent price!!!!

Would anyone happen to know WHICH gearset this is , just from a look here??

How would i be able to calculate the ratios for each gear also?
I have been told the final drive is 3.9









thanks

jon

RON

I can't tell you who made it, but i can tell you it's a 'dog' box!!
Also, it's using the original forks by the looks of it....
Ratios can be worked out by counting the number of tetth on say 1st gear, and then dividing one into the other..... kind of.... again for 2nd, 3rd etc...

911

WHERE do you all keep finding this stuff from!

I never seem to see it for sale anywhere so will end-up buying new.

Get some earmuffs too as that box will scream.

Graham (jealous)

Danny Boy

iTrader: (2)

I would agree with RON that they look like OEM forks as the plastic pads are still present on the tips, it also looks like a OEM open front diff.

One thing it is missing is the worm gear cut into the 3rd/4th cluster to drive the speedo, so you will have to find another way to drive that.

As suggested before you need to do some counting and dividing to find out what all the gear ratio's are, dont forget to find out the drop gear ratio in the transfer case as well as this will determine which rear diff you can use with it.

Dan.

j-k

Not worried about the speedo, its going into our 93 ra tarmac rally car(self build)

How do i find out the drop gear ratio???
We currently run a 4.1 final drive so intend to change the crown wheel and pinnion to suit..

thanks for the info....keep it coming

jon

Graham(911) sending you a pm

911

Graham

RON

Simply count the number of teeth on them.... it'll either be the same number on each, ie, 1 to 1..... or it won't be the same number of teeth, and will be 1.1 to 1......

Tim W

iTrader: (1)

It's quite probably a Quaife, or a Prodrive (Hewland manufactured) S2 gear kit...with very short RA ratios

j-k

BTTT

Arron

BTTT for ya JK.

Group N

JK

If it helps these are the ratios and calculations for my dog box

12 - 35 2.916 : 1 1st
11 - 23 2.090 : 1 2nd
18 - 28 1.555 : 1 3rd
17 - 20 1.176 ; 1 4th
20 - 18 0.900 : 1 5th

Count the teeth on the input shaft and then the corresponding gear on the drive shaft - divide one into the other (ie 35/12 = 2.916) and hey presto you can calculate the gear ratio's.
Looks like you have 39 teeth on your crownwheel therefore I reckon it could be on a 4.444 ratio - but can't tell for sure with the pinion in place

hope this helps
Good luck

j-k

Thanks for that matey...a great help.

I have counted the teeth and they are as follows..

11 - 38 3.454:1 1st
15 - 35 2.333:1 2nd
16 - 28 1.75:1 3rd
20 - 27 1.35:1 4th
36 - 35 0.972:1 5th

and from the transmission chart, these are exactly the same as i have in the car at the moment with the exception of the CWP. The teeth on that being 10 - 39 so i am presuming 3.9 final drive?? ie STI RA ratios??
My car has a 4.11 rear diff as standard. (93 wrx RA), but i have got a 4.11 CWP on the way...

thanks once again

jon