[b]Gearboxes[/b]

With so many people asking questions about them (final drive ratios etc) I thought it would be appropriate to pop it all down in writing on our forum in one place

[b]Car / Engine[/b] MX-3 (K8) & Probe GT (KLDE) [b]Gearbox[/b] G5M-R

Gear Ratios (Input:Output)
1st 3.307:1
2nd 1.833:1
3rd 1.310:1
4th 1.030:1
5th 0.795:1
Final Drive [b]4.388:1[/b]

[b]Car / Engine[/b] MX-6 KL-DE & 626 KL-DE [b]Gearbox[/b] G5M-R

Gear Ratios (Input:Output)
1st 3.307:1
2nd 1.833:1
3rd 1.310:1
4th 1.030:1
5th 0.795:1
Final Drive [b]4.105:1[/b]

These two gearboxes are identical except for the final drive ratio which I have highlighted, this difference should equate to around 250 - 300 rpm in the real world

[b]Car / Engine[/b] MX-6 FS-DE & 626 FS-DE [b]Gearbox[/b]G25M-R

Gear Ratios (Input:Output)
1st 3.307:1
2nd 1.833:1
3rd [b]1.233:1[/b]
4th [b]0.914:1[/b]
5th [b]0.717:1[/b]
Final Drive 4.105:1

In this gearbox you can see that 1st, 2nd and Final drive are all the same as the other boxes, the difference is in 3rd, 4th and 5th. I'm not able to work the difference in rpm by using the 5th gear in the MX-6 V6 gearbox but I would have a good guess that it would be a little lower still.

The G15M-R gearbox is used in the BJ Diesel (RF-MDT) I'm sure as the other gearboxes are interchangeable then it would physically fit onto the V6 but I can't be sure, it does however benefit from a lower final drive ratio so for those of us that want a lower cruising rpm then it would be perfect to swap over the final drive ratios.

I'm pretty sure this will all apply to the BJ sport too as some of the gearboxes are the same

More info will be added pretty soon but bed is calling

The info in this thread is what I have collected over the past year so may not be 100% upto date. Some things may not fit and as I haven't tried everything personally I won't be held responsible for people buying stuff then finding it won't fit

Stu

sorted, and thanks again

Hmmm, are there any gearboxs with a better 2nd gear I wonder, I hate 2nd in the 1.5, way too tall

5th needs to be much longer i think! feel likes im raggin the hell out if doing 85/90

on track or private road of course lee

[quote="marshymob"]on track or private road of course lee [/quote]

old airfeild runways matey

What? Longer? You're joking right? 5th gear in post BG cars is an economy cruise gear, whereas, 5th gear in the BG GT is a proper gear you can even use to overtake wuth

Still hate 2nd

I hate 5th, it's not economy

I'm not sure there is a different second without having it swapped out for a different one. . .

Its to do with reduced emissions and such like chap, most manufacturers ruined their gearboxs by fitting longer top gears in the mid nineties!

I really wish the V6 had a longer 5th, it's for too short

Swap ya

ok so if the box in my 1.5 BA goes what would my options be? Thanks

[quote="andym323"]What? Longer? You're joking right? 5th gear in post BG cars is an economy cruise gear, whereas, 5th gear in the BG GT is a proper gear you can even use to overtake wuth

Still hate 2nd [/quote]

I love the 2nd on the Fseries box in our cars!! It's better suited to the 1.8 engine though...

I've got some interesting information to add here maybee... It's more suited to boost applications but still...

Mazda has done some design work over the years...

Look at the diagonal part between the section of the box holding the gears and the diff... The triangel shape...

Then scroll down!


[img]http://i226.photobucket.com/albums/dd300/Koivusalo/AWD/plaincasing.jpg[/img]
G5M

[img]http://archive.pixbox.se/arkivet/synligt_35/29290000-29299999/640x480w/29297451.jpg[/img]
G25M (upgraded Gserie)

[img]http://i227.photobucket.com/albums/dd200/jesiotrot/gearbox/S1030398.jpg[/img]
H series

[img]http://i302.photobucket.com/albums/nn104/Jaakkoseta/HPIM4427.jpg[/img]
Welded up


THIS is the part where all mazda boxes go to shit when boosting!! Just wanted to add this, I understand
this is not about boosting but still... It seems the box actually flexes at the part between the diff and
part where the gears are...



Found this by accident on a US forum...

Very Very interesting, I'm seriously going to have to look at this

Those vents on the bottom of the box in the third picture, not seen them before

it's a H series gearbox andy so probably not from a BA

Dammit, must look closer