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question about late model overdrive control switch

Posted by purpleGT

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question about late model overdrive control switch #1
purpleGT Bud Osbourne Pittsburgh, PA., USA 1974 MG MGB GT "The Grape" 1977 MG MGB	Posted: June 21, 2012 07:58PM Registered: 5 years ago Posts: 2,279

I'm getting ready to plug the engine and teransmission into my wife's '77 B. I found what appears to be a good, used overdrive for it, but the wires coming out of the gear lever have been cut/broken/mangled and "spliced" (ends of wires twisted together and taped over) by some putz. I need to take the assembly apart, to replace those wires, but I'm afraid of busting something if I do it wrong.

Can someone give me the run-down for the disassembly of the shift knob w/overdrive control switch? The chrome nut at the bottom of the knob wants to turn, but only so far (obviously, the shift knob needs to come off, first.....but how?).

Thanks, guys.

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Re: question about late model overdrive control switch #2
molakermyrtles anne Maurice Laker Lincolnshire, United Kingdom 1962 Lambretta TV 175 Series 3 1970 Lambretta Li 150 Series 2 1979 MG MGB GT 1985 Lambretta DL (GP) 200	Posted: June 21, 2012 09:02PM Registered: 3 years ago Posts: 218

Hi the top just clips on.

Mo.............

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Re: question about late model overdrive control switch #3
dkgraber85 Darin Graber SLC UT, USA 1982 MG TF	Posted: June 21, 2012 09:11PM Registered: 2 years ago Posts: 50

Hello -

the top cap that has the lettering on it just pops off - carefully though as it is probably brittle and the aftermarket stuff doesn't fit or last as well. Then you can take the switch our and detach the wires. There is a nut in the bottom that spins loose (use an awl or something to reach down in there) and then the knob just lifts off. The chrome nut is there to tighten up the knob when assembled. The wires pass through a cut-out along the side "under" the threads. Hope that helps & good luck.

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Re: question about late model overdrive control switch #4
purpleGT Bud Osbourne Pittsburgh, PA., USA 1974 MG MGB GT "The Grape" 1977 MG MGB	Posted: June 21, 2012 10:05PM Registered: 5 years ago Posts: 2,279

Yes, that is a big help. Thanks very much!

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Re: question about late model overdrive control switch #5
Ogre1 Allan Ogilvie Melbourne Victoria, Australia 1977 MG MGB "Greenb"	Posted: June 21, 2012 10:12PM Registered: 2 years ago Posts: 1,355

Bud,

The connectors on the wires are not your normal style connectors so you might want to consider re using them. I soldered mine onto new wire and added a heat shrink over the wires where they pass through the tranny tunnel to avoid shorting. YOu can also get some more room to fit the wires by running a grinder into the slot made to pass the wires through and making it a bit deeper. Othewrise they can be a PITA to get back under the gear knob and chrome nut.

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Re: question about late model overdrive control switch #6
RAY 67 TOURER Ray Marloff Fort Bragg, CA, USA 1967 MG MGB "My Girl"	Posted: June 22, 2012 02:12AM Registered: 3 years ago Posts: 6,032

The 16" wiring harness, complete with the special connectors for the OD switch, is available from Moss and VB for under $15. A good, time saving investment. This was out of production for a very long time and is well worth getting. RAY

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Re: question about late model overdrive control switch #7
purpleGT Bud Osbourne Pittsburgh, PA., USA 1974 MG MGB GT "The Grape" 1977 MG MGB	Posted: June 22, 2012 06:27AM Registered: 5 years ago Posts: 2,279

More very helpful information, Ray and Allan.
Thanks!

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Re: question about late model overdrive control switch #8
ClayJ Clay Johnston Mt. Olive, MS, USA 1972 MG MGB	Posted: June 22, 2012 08:17AM Registered: 7 years ago Posts: 7,434

What Ray said. Plus the proper part has a sleeve to protect the wires.

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Re: question about late model overdrive control switch #9
purpleGT Bud Osbourne Pittsburgh, PA., USA 1974 MG MGB GT "The Grape" 1977 MG MGB	Posted: June 22, 2012 04:35PM Registered: 5 years ago Posts: 2,279

Yeah, I ordered the switch wiring Ray and Allan memtion from British Wiring, so I'm confident it will have the protective sleeve you mention.

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