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MG MGB Technical - Threads size for shifter knob

What is the thread size for a shifter knob on an left hand drive mgb roadster 1977 model year? Also what are some good sites for sh*ter knobs that will fit an MGB of the above make, model, and year?
Jimmy

Jimmy - You will ned to take the existing knob off and check the size and pitch for the threads since they vary from year to year. The threads on my 66 MGB are 5/16 - 24, but yours may be different. Cheers - Dave
David DuBois

What is the proper way to measure the threats?
Jimmy

Jimmy,

I just brought a nice leather shifter knob from the MGOC in England, and it came with several different hard rubber inserts to adapt it to fit with three set screws. Looks and works well. My car is a 74 1/2 "B".

www.mgcars.org.uk/



Cheers, Doug
Doug Keene

Jimmy. Assuming that you have the correct gearshift on your transmission, you will have a 7/16"UNF (7/16"-20) thread. The proper gearshifter will have a slot milled into one side, running upwards, where the wires run from the gearshift knob mounted overdrive switch (on cars having overdrive). The shaft of the shifter is two pieces of steel with a rubber bushing between the two. You have to remove the gaiter to see the construction of the shifter itself.

The earlier, Mark II, gearshifter will also fit into the later model transmission, but not vice versa. The Mark II shifter has a single piece shaft and is threaded 3/8" UNC. An easy way for you to check is to simply use a 3/8" UNC nut on the shaft. If it will fit, you have a Mark II shifter. If it is too small, you have the later shifter with the 7/16" thread.

As to how to measure such things, look at the tech article "Bolt Sizes" on my website, www.custompistols.com/ and it will explain how to use a dial caliper or micrometer and a thread pitch gauge to measure sizes.

As to gearshift knobs, I make my own. I have been making them out of 1 1/4" aluminum round stock for use by my family and friends. So, you can purchase an original, factory style gearshift knob, one of the aftermarket style in either wood or vinyl covering, or, for something unique, have a custom made gearshift knob made. All depends on what you want and how much you are willing to pay for it. Les
Les Bengtson

Les;
I have been running a late model (od switch in knob) shift lever in an earlier trans for ten years. The only modification is the removal of one of the threaded guide pins at the shifter base. Ray
Ray

Ray. So have I, but, with an unmodified tranny, the late model shifter will fit the late model only (due to the fact that the early models had two pivot pins rather than the one of the late model trannies) and the early model shifter will fit both types with no modifications. Les
Les Bengtson

Thanks I will have to go out and see which one I have.
Jimmy

This thread was discussed between 01/02/2004 and 02/02/2004

MG MGB Technical index

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