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RE: Overdrive

To: Huw Upshall <hupshall@wolfenet.com>,
Subject: RE: Overdrive
From: jak0pab@jak10.med.navy.mil (Bowen, Patrick A. RP2)
Date: Wed, 25 Nov 1998 11:07:41
It depends,  You still need the gear shifter, the mounting plate, the
mount, and the driveshaft.  Depends on if the junk yard has em and you call
talk them out of 'em.  If they say it is rebuilt I would still be cautious,
I am amazed at how many rebuilt engines and trannys there are out there.
If it is rebuilt $675 is a deal, if not you can certainly find it cheaper
with some hunting.  lol

Patrick

At 03:48 PM 11/23/98 -0800, Huw Upshall wrote:
>Ok, there is a local wrecking yard that has the overdrive transmission +
>overdrive + solenoid rebuilt for $675 including core which I don't have so
>that sucks.  What would this NOT come with?
>
>Shift lever?
>Switch?
>Angle speedo unit?
>
>oh boy, this is getting exciting... @#%!
>
>
>On Tue, 24 Nov 1998, Peter Cebalo wrote:
>
>> BY FAR the easiest method is to find a complete transmission. I
>> converted mine the hard way by adding it to the existing transmission. 
>> 
>> If you wish to use your existing tranny, there will be problems finding
>> some of the parts, especially the top cover and remote assembly. If you
>> choose this method, you'll probably want to replace all the bearings and
>> syncro rings,layshaft etc etc. ends up costing lots but you end up with
>> a better unit.
>> If you do it this way you'll need: ( minimum )
>> 
>> "J" type OD - ( careful - different types, some of the rear casings are
>> different - some don't have the upper mounting holes e.g. 73/74 Spifire
>> Mk IV - 3 rail type , TR6 , TR 2500 saloon, Dolomite, Stag - check the
>> speedo gears too... )
>> new mainshaft
>> rear main shaft bearing ( unless it's loose :-) likely you'll damage the
>> old one taking it off the shaft - hey, replace  them all ) 
>> top cover 
>> inhibitor switch gear
>> remote assembly tower ( not available new )
>> adapter plate ( sometimes difficult to get )
>> oil pump cam and circlip ( if these didn't come with the OD , also
>> expensive )
>> gaskets ( tranny to adapter, adapter to OD )
>> mounting plate
>> rubber mounting assembly ( best to use a new one )
>> speedo angle drive ( these are really expensive - about US$90 ? - I have
>> some of spares )
>> speedo cable
>> shortened propshaft ( get it balanced at the same time - check the UJs )
>> OD gear change lever (not available new )
>> OD switch, knob and cap ( available new )
>> wiring ( use the live wire from the reverse light )
>> 
>> Put you off yet ??
>> 
>> Finding a COMPLETE OD Transmission in good condition could be a
>> challenge. Always check the magnetic drain plug on the transmission for
>> fragments of metal and the colour of the fluid. If possible remove the
>> top cover and look for wear on the teeth and syncro rings. Condition of
>> the OD is hard to tell without separating the front and rear casings and
>> inspecting the clutch surfaces. If you remove the sump plate on the
>> bottom of the OD, you can check the magnetic strip on the plate for
>> obvious problems. Hard to check the solenoid even by applying 12 volts
>> to it - if it doesn't click - probably faulty - even if it clicks it can
>> still be faulty... 
>> 
>> Hope this helps
>> 
>> Peter Cebalo
>> 
>> Auckland, New Zealand
>> 
>> 73' Spitfire Mk IV ( with "J" type overdrive added 'the hard' way )
>> 
>> 
>> 
>>  
>> 
>> 
>> >
>> 
>
>
Patrick Bowen
'79 Spitfire
Jacksonville FL

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