[Zmagnette] 4 synchro MGB trans in ZB
durningcharles at gmail.com
Wed Nov 27 12:22:08 MST 2013
Thanks for the response. I'm not intending on using a MGB OD transmission
just the NON OD trans that came with the engine. My concern was with the
location of the shifter. I'm thinking that with a little fabrication I can
relocate the shift lever in the opening for the remote control. I might
even be able to adapt the Magnette lever there. I'll compare the 2 when I
get it out sometime in the future.
A friend has a used Ford Sierra trans and the adaptor parts he removed from
a wrecked MGB. It's FREE. I looked it over and it looks like the sfift
lever would interfere with the parking brake lever also. It looks like a
major job to relocate the shift lever on that trans. I would use it if
I can work out relocating the shift lever.
Frankly I would be happy with a 4 speed, that's why I would consider using
the NON OD MGB 4 synchro trans that came with the engine. I could keep the
3 synchro trans it would be easy enough to adapt to the 5 mb engine.
BTW I did some looking around and it looks like the trans from a Datsun
200SX or 240SX would put the shifter in the right place.
If you are using Google or Gmail, Big Brother is watching.
On Wed, Nov 27, 2013 at 12:05 PM, Allen Bachelder <bachldrs at comcast.net>wrote:
> As far as I know, the cheapest way to do this is with the Datsun 280Z
> five-speed (it has a "Z" in it!) and a Rivergate kit. I've done it on two
> different Magnettes. The kit is designed for an MGB so there is a bit of
> fabrication necessary - but it isn't rocket science. The bit in question
> is the transmission mount. The Hi-Gear Ford Sierra kit is available from
> either Moss or Bruce Woodson and I understand there is a purpose-built
> version for the Magnette.
> Having done the Datsun/Rivergate option, I can say that it is pretty darn
> easy. The pictures show the only modifications done to the car. Bear in
> mind that the PO had converted the car to the Datsun transmission with a
> kit homemade by his mechanic. The second picture shows how much material
> was removed from the back of the shifter opening. In fact, this is more
> than necessary, but the third picture shows how I dealt with it. I chose
> not to weld the new tunnel patch in case a future owner wants to reverse
> the conversion. In this sense, in answer to frequent criticism, by using a
> Japanese transmission, I actually preserved more original MG than I would
> have with an MG transmission. Another advantage to this approach is that
> the old Magnette drive shaft still fits - requiring only that the front
> U-joint yoke be reamed slightly to fit the Datsun U-joint which of course
> has it's own front yoke and transmission spline.
> If I recall correctly, I used an early MGB shift-lever boot. I did
> rework the flange of the shift-lever tower with a body hammer to fit its
> new location. The PO didn't use a tower at all.
> One more thought. If you're undecided about the transmission choice,
> first try replacing your original 4.55 differential gear set with a 4.3, a
> 4.1 (if you can find one), or a 3.9. This is an easy two-hour job. You
> might find that even with the original gearbox, you're happy with the
> higher-geared rear end. It's interesting that the two ZAs I rode in while
> visiting the UK were both the earliest 4.87 rear-end types, and while we
> never went on the "M roads" with them (equivalent to our interstates), they
> seemed remarkably unstressed. For awhile there, I started wondering why I
> had gone to all this effort. But then I get on the I-69 here in Michigan
> with its 70 mph speed limit and I'm sure happy to have my 5th gear, along
> with the 3.9, giving me 25 mph per 1,000 rpm.
> *Allen & Florrie Bachelder =iii=<Spring Creek Home for Wayward MGs*
> *'57 ZB, '65 B, '69 C/GT, '73 B/GT*
> *North Street, MI 48049, USA*
> On Nov 27, 2013, at 12:42 AM, Steve C. wrote:
> As Steve K states I installed a 4 syncro overdrive many years ago in my
> ZA. I would not even consider doing so today. The 5 speed kits are so much
> easier to do. The come with everything you need and require almost no
> modifications to the car. To install the late over drive you need to build
> a rear transmission mount, a transmission tunnel, drive shaft, speedo gear
> box and cable. Then deal with the starter hitting the frame and making a
> clutch hydraulic line. I also did some mods to the shift tower, but do not
> remember exactly what. I think that covers it all.
> Sent from my Android phone with mail.com Mail. Please excuse my brevity.
> Steve Kirby <skirby210 at cox.net> wrote:
>> It is not my place to answer this, and it is further not my place to
>> offer up this answer, but I will anyway! One of my first, of many,
>> mentors, in the Magnette World was Steve Carroll . . . he of thee superb
>> header set up many of us have purchased. Steve did put a full late B
>> synchro in his. I do remember Steve describing the various things he had
>> to do. Steve is a person of immense talents, so his pay grade is much
>> higher than mine. Perhaps Steve will answer, now that I've prodded him a
>> bit, or Charlie can contact him directly.
>> ----- Original Message -----
>> *From:* LannM at aol.com
>> *To:* zmagnette at autox.team.net
>> *Sent:* Tuesday, November 26, 2013 8:29 AM
>> *Subject:* Re: [Zmagnette] 4 synchro MGB trans in ZB
>> Shifter location aside, the 4 sync is wider than the 3 sync. Compare a 3
>> sync MGB with a 4 sync. The transmission tunnel is noticeably different.
>> I've put a 4 sync in and early MGB and it takes a lot of work with a BIG
>> hammer to move sheet metal around. Even then, its still a tight fit. I
>> can't imagine a Magnette would be any easier.
>> I think Allen is right, a Hi-Gear 5 speed would be quicker, easier, and
>> probably cheaper.
>> In a message dated 11/26/2013 10:19:44 A.M. Central Standard Time,
>> durningcharles at gmail.com writes:
>> I didn't think that even modifying the remote would work. It would still
>> be too far back, not to mention the height. I was thinking about
>> eleminating the remote and mounting the shifter directly to the opening on
>> the trans where the remote attaches. I still have to get under the car and
>> do some measuring to see if that would be close.
>> It would be good if some BMC car used the 4 synchro trans with a direct
>> shifter. That would keep me from having to make something.
>> Charlie Durning
>> On Tue, Nov 26, 2013 at 1:58 AM, <monster at caverock.net.nz> wrote:
>>> On the above page are some photos and a description of fitting an MGB
>>> engine and 4-synchro+overdrive 'box to a 1960's Farina Oxford.
>>> It includes a pic of shortening the remote gearlever extension to fit,
>>> and a new tunnel.
>>> I'd agree that the benefits of non-OD box over all the mods needed for a
>>> 3-synchro box might not be great.
>>> I also love the sound of the non-synchro 1st gear. Bah, musicians, eh?
>>> On 26.11.2013 15:50, Allen Bachelder wrote:
>>>> Even without overdrive, the remote shifter on the MGB 4-sync sits
>>>> high and your going to have to substantially reshape the transmission
>>>> tunnel to make it fit. That's a ferocious price to pay for a
>>>> synchronized first gear. If you're going to that much trouble, you
>>>> might as well go five-speed.
> Zmagnette mailing list
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Zmagnette