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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PostPosted: Wed Nov 21, 2018 9:22 am 
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A question that has come up, and probably hypothetical...
There is a ZF 4 speed auto conversion for the stag. But would it fit an 1850/sprint engine? Came about as the stag and sprint gearboxes use the same gearbox casing and both use an adaptor ring. So some commonality that should be possible to utilise?

And if it fits would the gearbox work correctly, or is it set up for a much torquier engine?

Space not such an issue....

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


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PostPosted: Wed Nov 21, 2018 3:18 pm 
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AFAIK the Stag conversion uses the Stag BW35 bellhousing to mate the ZF box to the engine, and as the BW35 wasn't available on the Dolomite it would make that part of the convesion a bit more tricky but it may be possible to source a ZF bellhousing that would fit to a modified engine bearer plate so I'd be surprised if it couldn't be done.

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PostPosted: Wed Nov 21, 2018 4:44 pm 
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I'm in the middle of carring out the convention on a Stag,I've still got to work out the inhibitor switch and reversing lights

Dave


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PostPosted: Wed Nov 21, 2018 4:49 pm 
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So an adaptor plate could work.
But how about the torque (or comparative lack of) with the dolly engine? That may be a more difficult issue.

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


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PostPosted: Wed Nov 21, 2018 6:45 pm 
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There are plenty of cars that were fitted with the ZF box, so look for one that most closely matches the Dolomite specs.

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PostPosted: Wed Nov 21, 2018 8:42 pm 
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Do we know the family name of the ZF box?. HP.4..?

Tony

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PostPosted: Wed Nov 21, 2018 8:58 pm 
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ZF4HP22

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PostPosted: Wed Nov 21, 2018 9:22 pm 
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if your able to get hold of a gearbox from an LDV (there like gold dust now) they would have a cable for the speedo, other wise like me have to go electronic

Dave


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PostPosted: Wed Nov 21, 2018 9:48 pm 
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I've seen other ZF boxes without the speedo drive converted to take a cable, in fact I've sold the parts to do it.

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Currently over 35 years worth of fixing 35 boxes.
Hoping to reach 65 years worth of fixing 65 boxes.


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PostPosted: Wed Nov 21, 2018 10:53 pm 
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If I recall correctly, Brian Kitley's Sherpa had a Sprint engine and ZF 'box....


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PostPosted: Fri Nov 23, 2018 7:29 am 
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So undoubtedly possible. Maybe a few hurdles but nothing a bit of engineering can't overcome.
All a thought exercise at the moment, and not for one of my cars...Enough said!

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


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