Hello All, can anyone tell me the differences between a “black” and a “blue” cover plate overdrive unit and if they are interchangeable?
Many thanks, David.
LH Overdrive
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- Forename: David
- Surname: Ramsbotham
- Location: Taunton, Somerset
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- Posts: 61
- Joined: Tue Dec 26, 2017 8:29 am
- Forename: David
- Surname: Ramsbotham
- Location: Taunton, Somerset
Re: LH Overdrive
Think I ‘ve just answered my own question! Black goes with 1280 tpm speedo whereas blue goes with 1000 tpm speedo as drive gears in overdrive units are different.
Anything else? David
Anything else? David
- steve00136
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- Forename: Steve
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Re: LH Overdrive
Found this link that explains the difference as well at https://mymgbinfo.wordpress.com/2019/01 ... ox-mgb-gt/ just taken my gearbox out.
steve livesley
Nottingham UK
1975 MGB Roadster https://mgb.tips
2003 MG ZT 260 V8 SE https://mgzt.info
Nottingham UK
1975 MGB Roadster https://mgb.tips
2003 MG ZT 260 V8 SE https://mgzt.info
- Peter Cresswell
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Re: LH Overdrive
Although you can use a blue Overdrive in car that had a Black overdrive originally the speedo will be wildly inaccurate. In theory a Blue LH Overdrive can be rebuilt as a Black LH Overdrive and vv. The speedo drive gear needs changing, but the only way you can do this is to use a overdrive specialist as you need a lot of specialist tools to dismantle and reassemble the unit. There are not many specialists in the UK (3 I think) that deal with Laycock Overdrives, but I have used ODSpares in Rugby who I have found to be very good.
Pete
1969 MGB Roadster
2020 MG HS Exclusive
2007 Mercedes SLK
Plus 34 other cars since 1965
1969 MGB Roadster
2020 MG HS Exclusive
2007 Mercedes SLK
Plus 34 other cars since 1965