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Thread: P5 5th gear swap

  1. #1
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    '03 p5 and '89 4Runner; M5 (wife's)

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    P5 5th gear swap

    Hey guys, looking for info on options for swapping 5th gear on the 5spd tranny, G15M-R. Would love to get lower RPMs, not just for better mileage but quieter etc.
    I know years ago NSN motorsports used to sell a replacement, can't find that anymore. I know it's just a swap from another Mazda/ford tranny but can't recall or find a source...

    Thanks
    My weekend toy


  2. #2
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    2002 Protege5

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    See here the diesel tranny for Europe.

    http://www.protegefaq.net/transmission.html#transused\

    http://protege323.com/content/25_tra...ions/index.php

    Looks like a change from .775 to .68 - about 14%

    Note the RF(TDI) also has a quicker first gear to boot.

    This might be a path for it.

    You can oversize tires and get about 7% change, maximum.
    Last edited by RABID_MP5; 05-18-2011 at 01:04 AM.
    02 Protege5 - Vivid Yellow - 245K mi
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  3. #3
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    '03 p5 and '89 4Runner; M5 (wife's)

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    Holy Moly, 14% drop is huge! I''d have to do the math, that might even be a bit too much. I'll have to watch the tach closely tomorrow to see what would be more ideal, but I'm thinking maybe 8-10% max.

    Not long before I'll need new tires and will prob go slightly oversize. Problem there is, it will affect all gears, making it easier to accidentally box 2nd or 3rd etc.
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  4. #4
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    '03 p5 and '89 4Runner; M5 (wife's)

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    Actually, after a little math, changing to .60 is only a 9.9% change relative to the .755, whats in there now. That may be pretty ideal. magic question is, where to get the gears?
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  5. #5
    Protege Stance OG Protege03ak46's Avatar
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    626 5th gear is about the same. Willing to bet it'll be easier and cheaper than one from a diesel overseas
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    As far as I know, the NSN swap was simply a repackaged 626 5th gear.

    Would be nice to get the whole 626 thing for a turbo car... because the 626 also had a longer final drive ratio. Don't know if it'll fit, though.

  7. #7
    Protege Stance OG Protege03ak46's Avatar
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    It should as long as you get the fs version...
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    Silly me... forgot the Malaysian guy.

    If I recall right, he was also on this board selling cam-gears.

    He had a 300 whp turbo FS-DE, but since they didn't get the manual car in Malaysia, he sourced a 626 manual gearbox for his car. Yup... bolted right up.
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    Registered Member tweety2300's Avatar

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    So a 626 trans bolts right up? Do they use the same clutch and everything?

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    Don't know how he did it... but it should mate up. A mate used a 626 block as a replacement block when a connecting rod poked a hole in his stock block.
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  11. #11
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    '03 p5 and '89 4Runner; M5 (wife's)

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    OK so I've found a few writeups on doing the swap, but nothing on the specific parts needed.
    Looks like I need a 5thgear out of a 626 - but I assume that really means 2 gears, right? The main input gear and the matching output gear?
    Plus some RTV... anything else?
    Now I just need to source those...
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  12. #12
    Da Short Bus Drivr bgibb68's Avatar

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    Quote Originally Posted by RatLabGuy View Post
    OK so I've found a few writeups on doing the swap, but nothing on the specific parts needed.
    Looks like I need a 5thgear out of a 626 - but I assume that really means 2 gears, right? The main input gear and the matching output gear?
    Plus some RTV... anything else?
    Now I just need to source those...
    I like this....I'm about to get a msp tranny as a spare to build for a quick swap....ild love a oil taller 5th....keep posted on this....time to go hunting myslef....so are the 626 gears any hardier? Will the LSD work with it too? Hell I might look into finding a whole tyranny and playing Frankenstein

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    Personally, I've always been of the opinion that the 626 transmission is sturdier... but... my 626 wasn't abused to hell like my Proty.

    Still... my brother did play at the drag races with it, so it wasn't exactly babied. I never had problems with crunching synchros on the 626, and having the whole transmission, with the 5th gear ratio and final gear, allowed it to cruise at 200 km/h at some 1000 rpms less than in the newer. Given, the tires were a bit taller, but not by that much.
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  14. #14
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    There may be another good deal here - changing the gears without pulling the tranny. I'd remembered hearing about this before. Anyone else know of it?

    http://www.mx6.com/forums/2g-mx6-gen...-5th-gear.html
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  15. #15
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    The NSN / 626 5th gear swap can supposedly be done without pulling down the transmission.
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