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Location:
Melbourne
Registered:
June 2003
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JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 02:51
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Do the JZA70 r154 gearboxes have a different shifter position to the MA70?
Based on my reading of poombah's site (http://www.supratt.tk) the JZA has a shorter bellhousing than the MA, and a straight gb crossmember, where as the MA has a gb crossmember that angles forward to the bolt holes on the chassis. This combination I think would put the JZAs gearbox about an inch closer to the front of the car than the MA? So if they have the same shifter position, one of them wouldn't come up through the centre of the hole.
I'm currently in the middle of an r154 conversion and I'm noticing that it's coming up right at the back edge of the hole in the tunnel.
Justin
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Location:
Melbourne
Registered:
June 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 03:20
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That's seems reasonable, I'm just going on my observations and what Poombah has on his site.
This image
http://www.supratt.tk/manual_conversion/r154_gearb ox/bellhousings_7mvs1jz_4.jpg
shows what is meant to be a jz bellhousing next to the 7m.
Does the end of the crank shaft of the 7m sit further out relative to the mounting plane of the bellhousing than a jz? That could explain the input shaft issue.
I've never seen a M to W series bellhousing side by side with a JZ to W bellhousing. Are they the same length?
Justin
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Location:
Brisbane
Registered:
February 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 03:23
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| CrUZsida wrote on Wed, 22 June 2005 13:04 |
...Just like the xZ10 has a different hole to the xA61
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yup - wilbo & I found that 7MGE + W58 with MA61 shifter position requires approx 25mm of metal at front of gearstick hole in an MZ10.
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 03:30
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I see your point Crispy.
And no, I haven't seen the W series bellhousings side-by-side.
It is possible that the crank sits further out, but an inch is a lot.
There have been lots of people on here swapping JZ for M bellhousings on the R154, so I highly doubt the input shaft varies.
You have raised an interesting point...
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Location:
Perth
Registered:
October 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 03:44
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Maybe that picture shows the 160mm Input Shaft dellow housing like I have on my R151f?
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Location:
Perth
Registered:
October 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 03:45
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Then again I can't remember the dellowing housings having as much external webbing 
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I supported Toymods
Location:
Adelaide
Registered:
July 2004
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 03:59
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I have an MA70 R154 with a JZ bellhousing on my soarer, not a problem lining up, infact i used the stock GB xmember and the shifter lined up perfectly...i cant see why you are having an issue
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Location:
Melbourne
Registered:
June 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 04:08
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Ok, did a little more looking around
Here's a 1jz with auto ring gear The ring gear sits the engine side of the bellhousing mounting face inside a mini housing thing.
Here and here shows the ring gear from my 7m. The ring gear sits inside the auto bellhousing, rather than in a housing on the engine, which the 7m doesn't have.
That by it self doesn't suggest that the gear box would be closer to the front of the car, but combined with the different gearbox crossmembers, the jz shape ___ and the 7m \__/ (though not so exaggerated  ) would put the gearbox closer meaning a possibly different shifter position
Justin
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 04:13
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Thet would also explain why the JZ autobox's have smaller bellhousings.
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Location:
Canberra
Registered:
September 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 05:50
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On my Auto to 5 speed converted MZ21 the Supra MA70 R154 gearbox comes up through the standard floor hole
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Location:
Brisbane
Registered:
May 2002
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 06:07
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| thechuckster wrote on Wed, 22 June 2005 13:23 |
yup - wilbo & I found that 7MGE + W58 with MA61 shifter position requires approx 25mm of metal at front of gearstick hole in an MZ10.
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As a point of interest, I had to do the same with my MA61 when installing the W58 with MA61 shifter position. I suspect the shifter hole is different between auto and manual cars, but that's just a guess because all three of my MA61's were originally auto.
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 06:09
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you're right norbie - on auto MA61s you have to chop an inch or 2 of metal off the front of the position. I've had to do this on mine, and have seen it done on many others. (but not on my original, as it was factory manual)
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 06:09
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| Norbie wrote on Wed, 22 June 2005 14:07 |
| thechuckster wrote on Wed, 22 June 2005 13:23 |
yup - wilbo & I found that 7MGE + W58 with MA61 shifter position requires approx 25mm of metal at front of gearstick hole in an MZ10.
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As a point of interest, I had to do the same with my MA61 when installing the W58 with MA61 shifter position. I suspect the shifter hole is different between auto and manual cars, but that's just a guess because all three of my MA61's were originally auto.
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You sure this isnt something to do with the position of the 2JZ?
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I supported Toymods
Location:
Australia
Registered:
November 2003
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 06:10
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Ok, cancel that.
Thats just wierd.
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Location:
Brisbane
Registered:
May 2002
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Re: JZA70 vs MA70 r154 gearboxes
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Wed, 22 June 2005 06:49
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| draven wrote on Wed, 22 June 2005 16:09 |
you're right norbie - on auto MA61s you have to chop an inch or 2 of metal off the front of the position. I've had to do this on mine, and have seen it done on many others. (but not on my original, as it was factory manual)
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That is macho interesting!!!! I was just under the impression that the MA61 shifter position was different to the MZ10 one, hmm would appear not! Appears that MA61 may indeed be the correct position and its the fact that all MZ10's were auto (to my knowledge) that made things interesting the other night during the 7mge -> MZ10 transplant...
Back to the topic of R154 gearboxes, I was under the impression that the shifter position between the JZA70 and MA70 were the same (I don't have first hand experience on this tho however!), however I thought that the JZZ30 was different (further back)...if yours is coming up right at the back is it possible that you have a JZZ30 R154 with the further back shifter position?
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I've never seen a M to W series bellhousing side by side with a JZ to W bellhousing. Are they the same length?
Justin
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I can check this and get back to everyone.
Cheers
Wilbo
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