MX-3.com

I'm looking to buy a 2.5L MX6/626 (0.717 overdrive) or the Protege 1.7L (4EE1-T) Diesel (0.680 overdrive), transmission 5th gear.

Not to say I don't LOVE running at 4000RPM while driving 120 on the highway... but my wallet doesn't love it as much.

Please let me know if you can help me out.

Maybe Im wrong but arnt you looking for a 4cyl 626/probe 5th gear not the one from a v6?

http://forums.probetalk.com/showthread. ... ansmission

I was basing my info from a Protege site... http://www.protegefaq.net/transmission.html

Could be wrong... anyone done this?

I did the Mazda MX6 or 626 Sourced 5th gear Swap
It will reduce your RPMs at 120 km/h (75 mph) from about 3700 to 3300 – a drop of about 400 rpm.

Combined city and highway driving I get 27 – 29 mpg or you guys might say 8.7 – 8.1 liters / 100km

I did this swap with the transmission still in the car. I believe I had to loosen the rear engine cradle bolts and allow it to drop down some so you could slip off the outer transmission cover.

Only 2 parts are needed for the 5th gear swap. The 2 gears themselves.
5th Gear #1
(Primary Shaft gear)
G560-17-611C
QTY: 1

5th Gear #2
(Secondary Shaft gear)
G514-17-308
QTY: 1

Optional new shaft locking nuts (I just reused mine)
Primary Shaft Lock Nut
F520-17-628
QTY=1

Secondary Shaft Lock Nut
G501-17-629A
QTY=1

Interesting!
So, if we want the 0.717 Overdrive gears... G560-17-611C and G514-17-308.

But... if you want an even LOWER overdrive... you have to dig through the Mazda service manual for the 1996 323F Diesel. Which has that sweet little 0.6801:1 ratio.

To get this... you need to have a junkyard in Australia, Europe or Japan... or track down these part numbers:
G564-17-611, and G526-17-308. They were used as the final drive for the 2.0L Diesels.

That being said! Now to track them down!

Turns out... if your Mazda guy knows a guy, these gears are STILL AVAILABLE in Japan/Europe... pricing to follow.

This is a very long overdrive gear tho... going to make your 5 speed feel like a 4 speed with a highway only gear.

No...Current Part Number....Description......Instock Q'ty.....Part Number You Entered...Remarks
1.....G614-17-308................GEAR,COUNT..........1.............G526-17-308....................$109.78
2.....G564-17-611B..............GEAR,OVER.............3.............G564-17-611....................$101.62

Here ya go guys! The cost of the 0.680 : 1 overdrive gear set! Direct from Mazda International (In Canadian Dollars)

interested to see what cruising speeds are when you install these

The 3.85 FD + 0.717 will get you this:

This was the tallest setup, before the 0.680 turned up, I think.

davmac wrote:I did the Mazda MX6 or 626 Sourced 5th gear Swap
It will reduce your RPMs at 120 km/h (75 mph) from about 3700 to 3300 – a drop of about 400 rpm.

Combined city and highway driving I get 27 – 29 mpg or you guys might say 8.7 – 8.1 liters / 100km

Which Final Drive? 4.338 or 4.105?

My final drive is going to remain the 4.388 : 1, I'm looking at a 100km/h (~62mph) cruising speed RPM of around 2700-2800.

Jforce wrote:

davmac wrote:I did the Mazda MX6 or 626 Sourced 5th gear Swap
It will reduce your RPMs at 120 km/h (75 mph) from about 3700 to 3300 – a drop of about 400 rpm.

Combined city and highway driving I get 27 – 29 mpg or you guys might say 8.7 – 8.1 liters / 100km

Which Final Drive? 4.338 or 4.105?

The above is for a 4.388 final drive (the OEM MX-3 differential).

Maybe you've all figured out how to calculate the rpm for a certain mph speed, 5th gear ratio and final drive (differential) ratio. If not:
rpm = 5th gear ratio*final gear ratio*mph/(0.001184*60)

The 0.001184 mile / rev tire is based on OEM size tire / wheel combo. Calculate your own ratio based on kph.
The 60 is there to convert hours to minutes.

So to sum that up, with stock tires:

Only 1 things that's odd:

Mx-3 runs 4000 rpm @ 120, calculation says 3700rpm........??

@edit: apperently mx-3's (also?) come with an 0.840 5th.....(euro thing? dunno?) or the info on the forum is wrong...

A 0.680 5th + 4.388 FD, will get you down to 2600rpm @ 100kph and a theoretical top speed of 265kph @ 7000rpm.

0.717 + 4.388, 2800rpm @ 100kph, TS 250kph

0.717 + 4.105, 2600rpm @ 100kph, TS 268kph

0.680 + 4.105, 2500 rpm @ 100kph, TS 282kph

0.795 + 4.105, 2900 rpm @ 100kph, TS 242 (stock mx-6)
0.795 + 4.388, 3100 rpm @ 100kph, TS 225 (stock mx-3)

17 inch tires, wil net you +4kph on top speed. And about 50rpm lower @ 100kph.

That would be 286kph or 178mph, haha to bad there isn't enough power to make up for the drag.

And the extreme, 3.850 FD + 0.680, TS 305 kph 2300 rpm @ 100 kph.

Would look for the 0.717, its easier to find. I have one, and know 1 or 2 more to find. Don't know what tires u run but, you would run @ 2750 rpm at 100kph.

I found these links, but I'd like to know from someone who has done the swap before what I'm looking at here:

This is for the Mazda Overtop Gear G565-17-611C, but that doesn't look like a gear at all...

It certainly doesn't look like it lines up at all with a 5th gear G521-17-308B:


If that's the case, what is the part number for the secondary shaft gear?
This is the part breakdown of the diesel transmission with the 0.680 gearset:


From my reading I thought that the 17-308A Lined up with the 17-611... maybe they don't use a universal labelling system, and a 17-611 on one G-series transmission doesn't line up with a 17-611 on a different one.

Can anyone help shed some light on this?

I have this set 0.717.

G565-17-611C lines up with the big one, I think.

U need only these 2:



(Haven't done the swap yet btw)

Here's some good stuff:

viewtopic.php?f=30&t=57566&p=402218&hil ... ll#p402218
viewtopic.php?f=24&t=65457&hilit=5th+gear+replacement
http://www.mazdas247.com/forum/showthre ... -Gear-Swap

RogueWolf wrote:
From my reading I thought that the 17-308A Lined up with the 17-611... maybe they don't use a universal labelling system, and a 17-611 on one G-series transmission doesn't line up with a 17-611 on a different one.

Can anyone help shed some light on this?

U need 17-308 and 17-611.

The one in your first picture is an 17-622