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MG MGB Technical - speedo gearing 67 w/74 od installed

I have a 67B originally w/o an overdrive but now has a 74B overdrive transmission installed. Will the original speedo read correctly?

I also have the o/d speedo from the donor 74B. If needed , will the mechanics from that speedo fit into the housing of the 67B speedo?
Steve Rechter

I have the same setup in my car. And, yes, the internals from the later speedo will fit into the earlier housing with a little modification. RAY
RAY

Only Mk1/3-synch cars have different speedo turns per mile between OD and non-OD. Jaeger speedos were 1040 and 1060tpm respectively, for some reason Smiths were 1020 and 1040. After that the two were the same at 1280, changing to 1000 on rubber-bumber cars. If you have changed from a 3-synch non-OD to a 4-synch OD you will have a much bigger error than simply changing between 3-synch non-OD and OD.
Paul Hunt

My application showed no error when checked with a GPS unit. RAY
RAY

This thread was discussed between 28/05/2009 and 29/05/2009

MG MGB Technical index

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