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4spd Gearbox and Overdrive Options  Rate Topic 
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 Posted: 05-08-2018 03:07 pm
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NJ_Brit
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Apologies if this is a repeat question, but I've read up and am confused about Gearbox + Overdrive options. I'm not that interested in the Toyota 5spd conversion.

I understand that the Rootes H120 gearbox (that had overdrive) can be fitted to the JH, but is it the entire gearbox, or just the overdrive box? I am running a stock 4spd with ~90k miles on it, and it's weeping oil from the seals, so is due a rebuild (it's completely smooth otherwise).

I figure that if it's an easy swap (and I can find the parts) I may as well fit the O/D whilst the gearbox is being overhauled.

My other question is whether the Rootes O/D is the only option, or whether one from an MGB/Spitfire could be used as they are more plentiful...). They both seem to be Laycock type units. Apologies if that is a really dumb question...

For reference, my JH is unrestored, aside from maintenance, and a couple of engine rebuilds (years ago) and a conversion to Dellorto's, so she's pretty much as she came from the factory in '74.

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 Posted: 05-08-2018 03:35 pm
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NJ_Brit
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Refining the question a little. The O/D unit used was either the D-type or the later J-type Laycock De Normanville overdrive.

Given the J-Type was used from '72 onwards, and the JH basically uses the stock Rootes gearbox, I am guessing a J-Type could be used. Correct?

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 Posted: 05-09-2018 01:43 am
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Jensen Healey
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A little bit of info here:
http://www.jensenhealey.com/forums/view_topic.php?id=1892&forum_id=2&highlight=D+overdrive+

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