[Healeys] Overdrive install advice needed

[Michael Salter]

I would concur with John regarding installing an overdrive to an installed gearbox. Easily screwed up and not worth trying.
Fitting an overdrive to a gearbox is relatively easy particularly with this special tool.
https://precisionsportscar.com/laycock-de-normanville-overdrive-installation-tool/
Reinstalling the gearbox is really a 2 person job with 1 person holding the back end of the unit up with a fan belt around the rear yoke and the other lifting the front of the box (bellhousing) from underneath.

M


________________________________
From: Healeys <healeys-bounces at autox.team.net> on behalf of JSARCH via Healeys <healeys at autox.team.net>
Sent: Monday, August 25, 2025 8:22:38 PM
To: 'Leonard Berkowitz' <drberkowitz at hotmail.com>; healeys at autox.team.net <healeys at autox.team.net>
Subject: Re: [Healeys] Overdrive install advice needed


I used non harding hylomar. BTW, it is extremely difficult to install the OD onto the transmission if it is in the car. I would suggest removing the transmission and mating it to the transmission with it in a vertical position; bellhousing facing down. However, the assembly is very heavy to reinstall into the car and it is best accomplished with two people. It can almost be easier to remove the engine and transmission, install the OD and then reinstall the engine/trans/OD back into the car.



John Spaur

’62 BT7



From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Leonard Berkowitz via Healeys
Sent: Monday, August 25, 2025 2:56 PM
To: healeys at autox.team.net
Subject: [Healeys] Overdrive install advice needed



Hi all



Thanks to much help from this list I was able to diagnosis the problem with my overdrive.  It turned out that the overdrive solenoid had become non functional.  Since I already had the transmission tunnel off and since the overdrive has not worked properly for over twenty years I decided to get a new rebuilt overdrive. The only question I now have is, how is everyone dealing with the gasket between the overdrive and the tranny and the gasket for the cover over the solenoid mechanism.  I haven't done any major work on the engine since the early 90's when I rebuilt both the engine and the tranny, and do not remember how I dealt with the paper gaskets. I've heard that permetex is good, but there are different types of permatex. So what do most of you use? And how do you use it.  BTW I was able to get 30 weight non detergent oil at my local advanced auto parts store, so that problem is taken care of.



Thanks in advance for any advice you can give me.



Len Berkowitz
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20250826/ee5e2d47/attachment.htm>