Everything you would ever want to know about Mazda gearboxes

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Zero
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Re: Everything you would ever want to know about Mazda gearboxes

#331 Post by Zero » Wed Mar 18, 2015 9:06 am

M types are not strong,, and only the s1 box retrofits to oldschoolers without any mucking around with shifter
they do all however share the same slip yoke to your current 4 spd
So S1 will bolt up to Twin dizzy with no mods? Or still need different bell housing?


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Re: Everything you would ever want to know about Mazda gearboxes

#332 Post by drtool » Wed Mar 18, 2015 5:58 pm

No, twin dizzy is different.


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Re: Everything you would ever want to know about Mazda gearboxes

#333 Post by ex | machina » Sat Mar 21, 2015 10:15 am

Any idea if the R100 10a 4spd gearbox can be fitted to 12a twin dzzy?



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Re: Everything you would ever want to know about Mazda gearboxes

#334 Post by drtool » Sun Mar 22, 2015 2:08 am

Same rear plate. Same top mount starter motor. I've not done it but can't see why it wouldn't work.


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Re: Everything you would ever want to know about Mazda gearboxes

#335 Post by sir-revalot » Sun Mar 22, 2015 1:36 pm

Unless its an Rx3.. they utilize bottom starter position..


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Re: Everything you would ever want to know about Mazda gearboxes

#336 Post by ex | machina » Sun Mar 22, 2015 3:49 pm

It's an RX4 twin dizzy.



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Re: Everything you would ever want to know about Mazda gearboxes

#337 Post by JoshN » Thu Mar 26, 2015 9:07 am

ok so when shortening the extension housing on an s2 box.......

which position should the "gear selectors" be in ? in this photo they are all in the middle position, not up and not down, MIDDLE.

and when the selector rod goes back in, which one should it line up with ? A, B, C ?

Image


the shit all just fell out when i pulled the extension housing off so i have no idea and i possibly wasnt paying enough attention to which position the gear selectors were in.


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Re: Everything you would ever want to know about Mazda gearboxes

#338 Post by bumpstart » Thu Mar 26, 2015 10:44 am

pretty sure the book used to say something about pushing rev/ 5th forwards ( thus selecting reverse ) to aid in putting the extension housing on

but myself found it easier in neutral ( middle ) and to drop it on offset, with a final twist as it goes unto the dowels


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Re: Everything you would ever want to know about Mazda gearboxes

#339 Post by RX7_BEN » Thu Mar 26, 2015 2:23 pm

bumpstart wrote: but myself found it easier in neutral ( middle ) and to drop it on offset, with a final twist as it goes unto the dowels
That's what I do, it can all only really go one way. As long as you have the selector rod engaging the forks and your new hole is true on the selector rod after shortening, then you're all good.



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Re: Everything you would ever want to know about Mazda gearboxes

#340 Post by BAIT » Sat Mar 28, 2015 1:48 am

Hi guys, read through the whole thread but just want to confirm I won't have any other issues lol

So a couple of questions regarding swapping from a s1 box to a s2.

Can I simply swap the rear housing from the s1 to s2, to keep the shifter in the same position or do I need to do the 103mm cut&shut on the remote shifter?

Can I use the s1 starter for the s2 box?

Cheers
Rob



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Re: Everything you would ever want to know about Mazda gearboxes

#341 Post by bumpstart » Sat Mar 28, 2015 2:03 am

starter is the same . i have done vichy versa with the s1 box being fitted with a s3 rear extension and it required swapping of the claws that the selector pulls on

this may require tapping a thread to swap the claws

this is because some early s1 boxes used a roll pin to fix the claws, whilst others used a grub screw and it is impossible to quantify to we see which combinations you have


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Re: Everything you would ever want to know about Mazda gearboxes

#342 Post by BAIT » Sat Mar 28, 2015 8:57 pm

Thanks Bumpstart, Cut and shut it is then! lol

But looks like I'll be need the box sooner than expected though, gave the rx4 a boot in second to third and now when taking off normally up to 15kph, have a major vibration throughout the car, then disappears after that. Clutch in, rev the motor no vibs, drive at 40 then clutch in and coast no vibs, only low speed take off and low speed coasting = major vibs.

So I believe its either the output shaft or driveshaft. feels like the vibs are in time with them. Just spent money on a new lightened fly wheel and now this happens lol



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Re: Everything you would ever want to know about Mazda gearboxes

#343 Post by JoshN » Sat Mar 28, 2015 9:04 pm

i am currently in the process of doing s1 box to s2 box conversion after smashign the s1 box.

the s1 extension housing will not go onto the s2 box, some of the dowels and bolt holes are in different places.


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Re: Everything you would ever want to know about Mazda gearboxes

#344 Post by bumpstart » Sat Mar 28, 2015 10:42 pm

i havent seen that yet outy, and i have hybrid even the MA and F2 gearbox versions together
they all seem to share a pattern like this-

Image

Image

s3 extension housing ( HB 12at cosmo ) on s1 gearbox
( redundant s1 extension on the floor .. another s2 gearbox is in background )



Image
MA gearbox into F2 bell and extension housing

apologies for the imageshack resize .. i took these pics years ago and image shack is trying to extort money by now only allowing thumbnails
if you click on the thumbs it will take you to image which will resize large on downloading


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Re: Everything you would ever want to know about Mazda gearboxes

#345 Post by bumpstart » Sat Mar 28, 2015 10:55 pm

BAIT wrote:Thanks Bumpstart, Cut and shut it is then! lol

But looks like I'll be need the box sooner than expected though, gave the rx4 a boot in second to third and now when taking off normally up to 15kph, have a major vibration throughout the car, then disappears after that. Clutch in, rev the motor no vibs, drive at 40 then clutch in and coast no vibs, only low speed take off and low speed coasting = major vibs.

So I believe its either the output shaft or driveshaft. feels like the vibs are in time with them. Just spent money on a new lightened fly wheel and now this happens lol
check diff backlash


when the going is hard, don't retard, remember your lubrication
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