What is the longest 5th gear i can get in a G

[OCD-SPEED]

I have a g series tranny and i need a longer 5th gear. 4 Grand at 80mph isnt cutting it. What is the longest gear i can get?

[1967cutlass]

Get taller tires?

[wht95scort]

I think the f-series trannys have a lower 5th gear ratio...i could be wrong

[MazdaRacer]

4.83 from a 626 or MX6.

Or you can get a new one direct from MSM or a Mazda dealer.

[FE3-323]

SOHC 1.8l DX/SE protege has a 5th gear that might fit, its said to fit anyhow.
the 323 5th gear does not.

[OCD-SPEED]

mazdaracer can u explain further, i dont know much about final gear ratios. i do know that 5th in a G is .795. What is it in the 626 or mx6?

I also heard maybe ZX2 gears fit in a G box?

[MazdaRacer]

sorry my bad, i miss informed. I also misunderstood and thought you were looking for a final drive, but your looking for an actual 5th gear. Here is a quote from Gro Harlem for final drive info, hope this somewhat helps.

Although, i was sure my local race buddy used a 626 final drive to reduce 5th gear RPMs on his EGT.

ADDITIONAL INFORMATION:

FYI for those who are out of the know....the list below details the G-series mazda gear box:

Cars with 4.39 final drive:
-92-96 MX-3 GS with 1.8 V6
-93-97 Ford Probe GT

Cars with 4.11 Final drive:
-90-94 Mazda Protege LX (1.8 dohc)
-95 Protege ES
-93-97 Mazda 626 and MX-6 (both 4cyl and 6cyl
-98-02 Mazda 626 (all models)
-01-03.5 Protege (all with 2.0 engines)
-91-94 Mercury Capri (all) note, these all have a cable operated clutch (which doesn't really matter if ur just taking the gears)
-91-96 Ford Escort GT or LX-E (with 1.8 dohc)
-91-96 Mercury Tracer LTS (with 1.8 dohc)
-97-Present Ford Escort & ZX2 (ALL MODELS, either 2.0 SPI or Zetec...all have a G-series gear box)

Cars with a different final drive:
-Ford Escape & Mazda Tribute (have like a 4.5x final drive...b/c they are trucks and use large diameter tires). dunno why the hell you'd want such a huge final drive.

[Bax]

The G5MX-R found on 4wd models (1.8sohc and gtx ) has 0.717:1 ratio
The G25m-r on Diesel proteges (hard to find) has 0.680:1 ( and a 4th of 0.860:1)
The GT-Ae gearbox has 0.717:1
The F5M-R has 0.731:1. If you find it on a b8-me engine (1.8sohc) it has a final drive of 3.619:1
Some F25M-Rs have also 3.619:1 final drive and 0.775:1 5th gear ratio

With all those different options and the fact that it's difficult to understand which gearbox you have in front of you when you buy from a junkyard, the only thing that you can do is guess.

(info from http://web2.airmail.net/theman/protegefaq/ )

[OCD-SPEED]

hmm basicly i want to be sitting at 2 to 3 grand rather than 4 going 80

[bmikedaman]

I'm not going to garuntee you that it will work, but 99.5 and up ZX2s used a .717 fifth, and certain MX6s did as well, though there's only a handful (5 pairs I believe) of the 626 part left in the country, it definately does fit a DOHC G box, but I'm pretty sure the ZX2 parts will fit as well, I should have more on this in a few weeks, I have a 98 ZX2 with the .75 fifth and I'm probably going to swap it with the .717 i put in the EGT as I daily drive the zx2 and any gas milage i can get is worth some effort.

[Intruder]

The G5MX-R found on 4wd models (1.8sohc and gtx ) has 0.717:1 ratio
The G25m-r on Diesel proteges (hard to find) has 0.680:1 ( and a 4th of 0.860:1)
The GT-Ae gearbox has 0.717:1
The F5M-R has 0.731:1. If you find it on a b8-me engine (1.8sohc) it has a final drive of 3.619:1
Some F25M-Rs have also 3.619:1 final drive and 0.775:1 5th gear ratio

With all those different options and the fact that it's difficult to understand which gearbox you have in front of you when you buy from a junkyard, the only thing that you can do is guess.

(info from http://web2.airmail.net/theman/protegefaq/ )

Which one of those will produce the lowest RPM? I'm a noob and I don't know if a smaller or larger number equals lower RPM.

[bmikedaman]

Which one of those will produce the lowest RPM? I'm a noob and I don't know if a smaller or larger number equals lower RPM.

Lower numbers are "taller" higher numbers are "shoter" ie .717 fifth gear will produce a lower rpm at a given speed than a .795 fifth would. Or a 4.11 final drive would produce lower rpm per mph in all gears, and 4.39 would be a higher rpm per mph in all gears.

[Intruder]

Got it. Thanks.

[Turpro]

i think the guy who owned my car b4 me installed the 626 final cause at 80 im sitting at 36-3700 rpm.

[atlantamx3]

In my BP-Powered MX-3 with an MX-3 tranny (F-Series).. at 75mph in 5th gear, I am at 3600 RPM.