alfa sud gear lever modifaction - Alfa Romeo Forum
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(Post Link) post #1 of 2 Old 09-06-15 Thread Starter
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Wave alfa sud gear lever modifaction

can any show some light on 33\sud gear lever mods

looking for photos of how to do this mod
can any one help??
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Hi, this is a famous problem with last 33.

1) if you have a sud or an alfa 33 first series (1983-85),
or a gearbox and linkage from them,
you already have a very good system,
the two axis of rotation of the lever are separated
to obtain optimal travel and position of the lever,
it is a pleasure to use cars with that lever linkage
because it seams to drive some old style super sport car;
but to work at his best after 30 years of use
this system need to replace every small bushing worm out,
and find every pieces is not easy, maybe you have to lathe
some of them in teflon or bronze

2) in alfa 33 second series (86-89) you have a more
simple and economic system, the two rotation axis of the lever
are in the same point, the rubber bushing at the base of the lever;
this is more simple to repair but have "geometric" limits
due to the relative position of the gearbox linkage and the lever:
- longitudinal travel is too long
- lateral travel is too long
- more over, the lever is quite advanced respect the driver seat,
and the steering wheel also is a bit too much advanced

3) in alfa 33 last series (90-94) you have a lever that is almost
similar than second series (only the joint in the middle is larger,
a bit more precise) and the same geometric problems,
plus the joint between the linkage and the gearbox
is different and can separate itself in every moment
leaving your car in a fixed gear (typically 3st or 4st gear);
here an explication of the problem:
and here a very good idea to fix it (but on internet you will find also other similar ideas):
Moreover in the last series the steering wheel is a bit more advanced,
so the 33 of last series are the less ergonomic

4) there is also the 145 boxer gearbox and linkage system.
It uses cables as in modern cars, this have advantages because
you can relocate the lever everywhere (for ex. more back or higher)
without affecting the travel of the lever, but also disadvantages,
the apparent feeling with cables is less sport, and relevant
time is needed to adapt the system on a sud/33

If you have a second/last series system, it is not
simple correct the geometric problems.

Somebody shortened the lever to reduce lateral
and longitudinal travel, but in my opinion this is
not a good idea because the lever knob becomes
even more lower and difficult to reach; I see that
people using 33 at track instead sometime try to have
the gear knob more high and near the steering wheel.

Somebody relocate the lever more high,
or keep the lever in original position
but relocate higher the fulcrum in the middle
of the lever (this shorted the longitudinal travel),
but these mods will force the joints of the linkage to work
in less optimal condition, so it can be done but in
my opinion with moderation; for example you can
relocate higher the fulcrum in the middle of the
lever of 4-5 mm and get -10% of longitudinal travel;

For the lateral travel you can only service the rubber bushes
when worn out, in particular the one in the joint between
leverage and gearbox when quite worn out makes the lever
almost reach the side of the seats.

What you can do without disadvantages is relocate
the lever 1-2cm back, but is time consuming and complicate,
(for example you will have problems to solve with the rubber cuff),
or you can, really more easy, simply "bend" back only
the higher part of the lever, without shortening it,
to have the lever knob 3-4 cm more near the driver,
and maybe at the same time relocating back also the
steering wheel of 3-5 cm (also better if using a 35-36cm
steering wheel instead of the original 38 cm steering wheel),
in my experience this simple mod already have
a great effect on gearbox manoeuvrability.

If you see at this picture:
the simple and effective mod is the one pointed out by the letter B,
a worse way (with more stress on the rubber cuff) to do the same was the letter A,
instead relocating higher the fulcrum in the middle of the lever is pointed out by the letter C.

More pictures in the same page (I hope I can link this):
Arretrare la posizione di guida dell’alfa 33: volante – cambio – sedile

If you see at the photos, my first attempt to modify the lever
was not done in the best way ("B") showed in the drawing,
the welder have done it in a different way:
because he had few time at the moment, but it worked.

Ps.: ultimate mod will be build by scratch a system inspired
to the first sud/33 gearbox two separate axis lever and linkage,
but with ball bearing on the lever and universal joint on the linkage
joints (using universal joint from a steering column axe),
but I have only some drawings at the moment and
probably I will have not the time to build it in practice.


Last edited by bobkelso; 09-06-15 at 23:25.
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