I'm working out the details of getting an O/D tranny for my car and have a few more questions. I have a '70 B, non-OD This tranny is off of the later (non-crash box) car, it has the OD switch on the
Without trying to research the details I am not familiar with, I can There are at least 2 versions of the 4-synchro OD tranny, with a changeover in 1977, I believe. They use different speedo calibrat
My experience with my 71 BGT ( and a 72 transmission) was - yes, you will need a shorter drive shaft. Best to buy the drive shaft with the o/d transmission if you are buying used, if possible. And th
Author: "Kai M. Radicke" <kradick1@ic3.ithaca.edu>
Date: Tue, 21 Dec 1999 12:59:55 -0500
The speedometer does not need to be changed, I repeat... the speedometer does not need to be changed. The only difference is the face of the two speedometer, the internals are all the same. It is a s
This would seem logical. But I thought the internal gearing was different on the speedos originally. Even if so, a recalibrated face would be an easier fix. When I first changed my o/d, I just put a
I really can't say definitively if a different speedo is needed or not for a 4 synchro. For the 3-synchro the gauge is the same OTHER THAN THE INTERNAL GEARING which is only about 5% different - a di
Author: "Kai M. Radicke" <kradick1@ic3.ithaca.edu>
Date: Tue, 21 Dec 1999 15:21:32 -0500
Keep in mind that the 1280 O/D speedometer was not used throughout the 4-synchro MGB cars with overdrive, in fact I believe it is a 1971-1972 speedometer only. What prompted our research into the mat
Author: Florrie & Allen Bachelder <bachldrs@swva.net>
Date: Tue, 21 Dec 1999 16:16:47 -0400
In my experience, the 1000 and 1280 speedos (or at least their faces!) are not interchangeable as the drive gears were different. But these differences were not related to the presence or absence of
A face change WOULD resolve the differences... but with one each in hand ( a 1280 and a 1000) I can tell you... THEY ARE NOT THE SAME INSIDE! ...now over the years there may have been variations in b
This is true. I have a spare 1000 and a spare 1280 which I have taken apart. And there is a metal spindle (?) in each, with differing thread patterns. So all these years, I thought this part would ha
Author: Florrie & Allen Bachelder <bachldrs@swva.net>
Date: Tue, 21 Dec 1999 17:51:52 -0400
But we still haven't dealt with the odometer... Changing the face doesn't change the odometer. Also, the physical presence of the odometer rules out rotating the face to put 60 mph at 12 o'clock. And
Hmm, that is a problem. Mostly I just want a working odometer so I can do TSD rallies :) Skye -- 1966 MGB - GHN3L Safety Fast! __,__\__ The MGB Experience http://www.mgb.bc.ca/ (_o____o_)
Florrie & Allen Bachelder had this to say: Hmmm, I can reach the lock-out switch from the tunnel opening in my 66. This is an LH OD tranny, so I did have to open up the hole lengthwise. But I'd give
The 1968 thru 1975 non-overdrive cars were equipped with the small diameter 1280 speedo, the OD cars were equipped with a different small diameter speedometer (a 1040 I believe). In 1976 the method o
wizardz had this to say: Well, Moss shows two different speedo drive pinions for the late overdrive, so that may be what was used to compensate. The OD serial # indicates which one was used. -- Max H
Florrie & Allen Bachelder had this to say: Oh, yeah. You're dead right. So.... what is the real story behind this face-swapping? A myth? It seemed to work for Kai... -- Max Heim '66 MGB GHN3L76149 If
Author: Florrie & Allen Bachelder <bachldrs@swva.net>
Date: Wed, 22 Dec 1999 09:23:24 -0400
For that reason I quit driving it. The car needs some body work anyway...((sigh)) Allen ** Allen H. Bachelder =iii=< Sinking Creek Home for Wayward MGs 49 YT, 57 ZB, 58 ZB, 65 B, 67 BGT, 73 B, 73BGT
The comment about changing the face I believe will not work. In my experience, I have a 67 with a 74 trany, the difference is a percentage. Mine will read almost accurate at low speeds and as the spe