The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: 1500 OverDrive Gearbox
PostPosted: Sat Nov 10, 2018 9:12 am 
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Posts: 152
Hi all,

Im looking for a good condition & working 1500 Overdrive gearbox.

Ideally as close to Bristol as possible.


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PostPosted: Sun Nov 11, 2018 9:19 pm 
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Joined: Sun Aug 21, 2011 4:12 pm
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Location: Highley, Shropshire
I may be mistaken (don't think so though) but i'm pretty sure you could remove the 1850 bellhousing from the overdrive box you got from Dan and substitute the bellhousing from your non O/D 1500 box and it will work (assuming both are single rail boxes)

Steve

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2 door '73 Toledo with Vauxhall Carlton 2.0 8v engine OWF 797M (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, MOT prep. Apprentice served Triumph Specialist for 45 years and home of Maverick Triumph.PM for more info or quotes.


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PostPosted: Mon Nov 12, 2018 11:56 am 
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Quote:
I may be mistaken (don't think so though) but i'm pretty sure you could remove the 1850 bellhousing from the overdrive box you got from Dan and substitute the bellhousing from your non O/D 1500 box and it will work (assuming both are single rail boxes)

Steve
Hi Steve,

Thank you for the info, Ill do some research! However in the meantime if someone has a 'Known good' OD box i will happily buy it for piece of mind.

Thanks


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 Post subject: No......
PostPosted: Mon Nov 12, 2018 4:46 pm 
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Joined: Thu Aug 09, 2007 12:22 pm
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Location: Caithness, Scotland
Quote:
I may be mistaken (don't think so though) but i'm pretty sure you could remove the 1850 bellhousing from the overdrive box you got from Dan and substitute the bellhousing from your non O/D 1500 box and it will work (assuming both are single rail boxes)

Steve
I am not sure about that,
didn't Jod Clark post an explanation of what is different and why it difficult therefore to employ an 1850 'box
on an OHV engine?


I do 1850 bellhousings are the same on manual 'boxes with or without o/d.

Ian.

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 Post subject: Re: No......
PostPosted: Mon Nov 12, 2018 11:11 pm 
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TDC Shropshire Area Organiser

Joined: Sun Aug 21, 2011 4:12 pm
Posts: 4783
Location: Highley, Shropshire
Quote:
Quote:
I may be mistaken (don't think so though) but i'm pretty sure you could remove the 1850 bellhousing from the overdrive box you got from Dan and substitute the bellhousing from your non O/D 1500 box and it will work (assuming both are single rail boxes)

Steve
I am not sure about that,
didn't Jod Clark post an explanation of what is different and why it difficult therefore to employ an 1850 'box
on an OHV engine?


I do 1850 bellhousings are the same on manual 'boxes with or without o/d.

Ian.
If there IS a difference, it will be in the length of the gearbox input shaft. The actual main gearbox case is the same on both models, so will accept either 1500 or 1850 bellhousing on the same 5 bolt fitting. Ancient wisdom suggests that the 1850 has a closer ratio gearset, closer even than the GT6 box from which it was derived, but this may be an urban myth. Without the relevant parts lists to hand, speculation is futile, so i'll stop it!

Steve

_________________
2 door '73 Toledo with Vauxhall Carlton 2.0 8v engine OWF 797M (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, MOT prep. Apprentice served Triumph Specialist for 45 years and home of Maverick Triumph.PM for more info or quotes.


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PostPosted: Mon Nov 12, 2018 11:27 pm 
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Joined: Sun Oct 26, 2008 7:26 am
Posts: 1903
I am certain the input shaft is longer on the 1850, and the clutch splines have a larger diameter (though that need confirming) .

same as GT6 box v std spitfire.

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Clive Senior
Brighton
Driving Toledo fitted with slant 4, sprint OD box and axle. Needs fettling!


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 Post subject: No......
PostPosted: Tue Nov 13, 2018 1:18 pm 
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Joined: Thu Aug 09, 2007 12:22 pm
Posts: 6311
Location: Caithness, Scotland
Quote:
If there IS a difference, it will be in the length of the gearbox input shaft. The actual main gearbox case is the same on both models, so will accept either 1500 or 1850 bellhousing on the same 5 bolt fitting. Ancient wisdom suggests that the 1850 has a closer ratio gearset, closer even than the GT6 box from which it was derived, but this may be an urban myth. Without the relevant parts lists to hand, speculation is futile, so i'll stop it!

Steve
Whilst the bellhousings both do have a five bolt fixing, the patterns are different, so only four will actually line up.

Early 1850s used the GT6 gearbox but with a different bellhousing only.




Ian.

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PLEASE help us to maintain a friendly forum,
either PM or use Report Post if you see anything you are unhappy with. Thanks.


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