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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-installatio=
n-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@autox.team.net> on behalf of JSARCH via Heal=
eys <healeys@autox.team.net>
Sent: Monday, August 25, 2025 8:22:38 PM
To: 'Leonard Berkowitz' <drberkowitz@hotmail.com>; healeys@autox.team.net <=
healeys@autox.team.net>
Subject: Re: [Healeys] Overdrive install advice needed
I used non harding hylomar. BTW, it is extremely difficult to install the O=
D onto the transmission if it is in the car. I would suggest removing the t=
ransmission and mating it to the transmission with it in a vertical positio=
n; bellhousing facing down. However, the assembly is very heavy to reinstal=
l into the car and it is best accomplished with two people. It can almost b=
e easier to remove the engine and transmission, install the OD and then rei=
nstall the engine/trans/OD back into the car.
John Spaur
=9262 BT7
From: Healeys <healeys-bounces@autox.team.net> On Behalf Of Leonard Berkowi=
tz via Healeys
Sent: Monday, August 25, 2025 2:56 PM
To: healeys@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 fu=
nctional. Since I already had the transmission tunnel off and since the ov=
erdrive has not worked properly for over twenty years I decided to get a ne=
w rebuilt overdrive. The only question I now have is, how is everyone deali=
ng 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 th=
e 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 p=
ermetex 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 de=
tergent 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
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<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt;">
I would concur with John regarding installing an overdrive to an installed =
gearbox. Easily screwed up and not worth trying. </div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt;">
Fitting an overdrive to a gearbox is relatively easy particularly with this=
special tool.</div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0=
, 0, 0);">
<a href=3D"https://precisionsportscar.com/laycock-de-normanville-overdrive-=
installation-tool/">https://precisionsportscar.com/laycock-de-normanville-o=
verdrive-installation-tool/</a></div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0=
, 0, 0);">
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. </div>
<div dir=3D"auto" style=3D"font-family: Aptos, Aptos_MSFontService, -apple-=
system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0=
, 0, 0);">
<br>
</div>
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system, Roboto, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0=
, 0, 0);">
M</div>
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</div>
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erif; font-size: 12pt;">
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<br>
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<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys <healeys-b=
ounces@autox.team.net> on behalf of JSARCH via Healeys <healeys@autox=
.team.net><br>
<b>Sent:</b> Monday, August 25, 2025 8:22:38 PM<br>
<b>To:</b> 'Leonard Berkowitz' <drberkowitz@hotmail.com>; healeys@aut=
ox.team.net <healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] Overdrive install advice needed</font>
<div> </div>
</div>
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<div class=3D"x_WordSection1">
<p class=3D"x_MsoNormal"><span style=3D"font-size:11.0pt; font-family:"=
;Calibri",sans-serif">I used non harding hylomar. BTW, it is extremely=
difficult to install the OD onto the transmission if it is in the car. I w=
ould 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.</span></p=
>
<p class=3D"x_MsoNormal"><span style=3D"font-size:11.0pt; font-family:"=
;Calibri",sans-serif"> </span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:11.0pt; font-family:"=
;Calibri",sans-serif">John Spaur</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:11.0pt; font-family:"=
;Calibri",sans-serif">=9262 BT7</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:11.0pt; font-family:"=
;Calibri",sans-serif"> </span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"x_MsoNormal"><b><span style=3D"font-size:11.0pt; font-family:&q=
uot;Calibri",sans-serif">From:</span></b><span style=3D"font-size:11.0=
pt; font-family:"Calibri",sans-serif"> Healeys <healeys-bounce=
s@autox.team.net>
<b>On Behalf Of </b>Leonard Berkowitz via Healeys<br>
<b>Sent:</b> Monday, August 25, 2025 2:56 PM<br>
<b>To:</b> healeys@autox.team.net<br>
<b>Subject:</b> [Healeys] Overdrive install advice needed</span></p>
</div>
</div>
<p class=3D"x_MsoNormal"> </p>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Calibri",san=
s-serif; color:black">Hi all</span></p>
</div>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Calibri",san=
s-serif; color:black"> </span></p>
</div>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Calibri",san=
s-serif; color:black">Thanks to much help from this list I was able to diag=
nosis 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 pro=
perly for over twenty years I decided to get a new rebuilt overdrive. The o=
nly 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 gaske=
ts. 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. &=
nbsp;</span></p>
</div>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Calibri",san=
s-serif; color:black"> </span></p>
</div>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Calibri",san=
s-serif; color:black">Thanks in advance for any advice you can give me.&nbs=
p;</span></p>
</div>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Calibri",san=
s-serif; color:black"> </span></p>
</div>
<div>
<p class=3D"x_MsoNormal"><span style=3D"font-family:"Calibri",san=
s-serif; color:black">Len Berkowitz</span></p>
</div>
</div>
</div>
</body>
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