Overdrive type to model

[Paul Amey]

Which vehicles left the factory with a D type overdrive unit fitted please?

[Pete Lewis]

any small chassis cars  can  have a d type

big saloon may be   Jtype     1500 spity can be j type

most TR  A   type 

its based on age and power outputs 

 

Pete

[johny]

Herald is the only one that officially never had a factory fitted overdrive... 

[Paul Amey]

1 hour ago, Pete Lewis said:

any small chassis cars  can  have a d type

big saloon may be   Jtype     1500 spity can be j type

most TR  A   type 

its based on age and power outputs 

 

Pete

Thanks, my Vitesse 2 litre 1967 came with a D type, but it has a more Dolomite looking gear lever?

[Pete Lewis]

well dolly did use the same family of 3 rail gearboxes so gear shift is an easy swap 

as for single rail  they can be fitted  

3 rail reverse is press down and left forwards 

single rail is lift and right then forwards 

so its easy to telll what you have without any groveling or tunnel removing 

as you have a D type i would expect  (in general)  that to be matched to a 3 rail gearbox 

[Paul Amey]

8 hours ago, Pete Lewis said:

well dolly did use the same family of 3 rail gearboxes so gear shift is an easy swap 

as for single rail  they can be fitted  

3 rail reverse is press down and left forwards 

single rail is lift and right then forwards 

so its easy to telll what you have without any groveling or tunnel removing 

as you have a D type i would expect  (in general)  that to be matched to a 3 rail gearbox 

Thank you Pete.

[68vitesse]

On 02/11/2024 at 19:33, Paul Amey said:

Thanks, my Vitesse 2 litre 1967 came with a D type, but it has a more Dolomite looking gear lever?

Early Dolomite 1850 used a three rail with J type overdrive, a straight swop, apart from change the bell housing, into a 2L Vitesse or GT6.

Regards

Paul.

 

[johny]

Yes nothing to stop a gear lever with its integral switch being taken off a Dolomite 3 rail OD box and installed on a Vitesse D type OD box. Have to modify the OD solenoid wiring of course but easy enough...

[Paul Amey]

23 hours ago, johny said:

Yes nothing to stop a gear lever with its integral switch being taken off a Dolomite 3 rail OD box and installed on a Vitesse D type OD box. Have to modify the OD solenoid wiring of course but easy enough...

Thanks for that johny,   I'll have to find out about the wiring.

[Josef]

For D types (and A types) you should also have a relay fitted. For the RHD small chassis cars this was originally next to the battery box. (There should be a second one for the horns on all (most?) of the cars too)

[Jon J 1250]

22 hours ago, Josef said:

For D types (and A types) you should also have a relay fitted. For the RHD small chassis cars this was originally next to the battery box. (There should be a second one for the horns on all (most?) of the cars too)

Sorry for thread tangent, but I've always wondered why the Spitfire/GT6's have horn relays and Herald/Vitesse don't, they all originally were fitted with the same two Clear Hooters horns weren't they?

JJ

[Pete Lewis]

the answer is ..............a Hoot !!!

sorry 

i would guess this is just a general upgrade of wiring in the later years of design

Pete

[johny]

21 minutes ago, Jon J 1250 said:

Sorry for thread tangent, but I've always wondered why the Spitfire/GT6's have horn relays and Herald/Vitesse don't, they all originally were fitted with the same two Clear Hooters horns weren't they?

JJ

I think its to do with the wiring layout of the two types of car because the relay isnt wired as is normal having a small current to control a larger one. The same supply to it powers the relay AND horns so no saving there. However the relay does mean not having to have a wire going all the way to the horns and back again to the cabin horn push to earth them as in the Herald/Vitesse - its much simpler as the single supply connects to the relay where one wire then goes off to horn push and another to the horns...

[Jon J 1250]

8 minutes ago, johny said:

I think its to do with the wiring layout of the two types of car because the relay isnt wired as is normal having a small current to control a larger one. The same supply to it powers the relay AND horns so no saving there. However the relay does mean not having to have a wire going all the way to the horns and back again to the cabin horn push to earth them as in the Herald/Vitesse - its much simpler as the single supply connects to the relay where one wire then goes off to horn push and another to the horns...

Now that makes sense, hadn’t considered that being the reason, thanks Jonny.

JJ

[johny]

Makes you wonder why they didnt so the same on the Herald/Vitesse but perhaps there was more profit margin in the sports models to allow for luxuries😁