SKU: PP200741
Polyurethane flexible driveshaft coupling Vaz 2101-2107 1970-2004
In stock15 pcs.$53.57Log in as dealer
Driveshaft Flex Disc (Giubo)
A driveshaft flex disc is the flexible coupling that bolts between the transmission flange and the driveshaft, passing torque while absorbing driveline shock. Mechanics also call it a guibo, a giubo, or simply a rubber donut. This category covers polyurethane flex discs for cars, vans, trucks and farm machinery, cast at our plant in Ukraine. The full driveline range is in the polyurethane parts catalog.
What a flex disc does
A flex disc is an elastic body with steel sleeves molded inside it. Bolts run through those sleeves, alternating between the gearbox flange and the driveshaft flange, so torque never crosses a rigid joint. Instead it travels through an element that twists a few degrees under load, letting the car launch and shift without a bang in the driveline. The disc also absorbs the misalignment that appears as the chassis flexes and the mounts settle, and it blocks the path shaft noise takes into the cabin. On two-piece shafts it works with the center support bearing, and on rear-drive cars with the differential mount, so polyurethane differential mounts and flex discs usually reach replacement mileage together.
Symptoms of a worn flex disc
Flex discs fail gradually: first a light vibration under acceleration, then a hard thump on take-off. On a lift, twist the driveshaft by hand — free play should be minimal and the body must not be delaminating. Once the steel has chewed the bolt holes oval, retorquing will not save the part. While the shaft is out, inspect the driveshaft center support bearing too — it causes the same vibration at speed and is best done in the same job.
Signs it is time for flex disc replacement
- vibration through the floor between 40 and 65 mph that eases off when you coast;
- a dull thump into the driveline on take-off, on shifts and on lift-off;
- cracks in the body, delamination, exposed cord around the bolt holes;
- oval bolt holes, loose or sheared coupling bolts;
- oil weeping onto the disc from a leaking gearbox seal — rubber swells in oil;
- driveline hum that survives a shaft balance, and flanges shifting against each other when you blip the throttle on the brakes.
Polyurethane vs rubber flex discs
A factory flex disc is cord-reinforced rubber bonded to steel sleeves. It works in tension, compression and torsion at once, in the worst environment rubber can face: exhaust heat, road salt, and gear oil from a weeping output seal. The rubber swells, loses elasticity and tears through the webs between the sleeves. Polyurethane does not swell in oil or fuel, ignores salt and cold, and does not age from ozone or crack from sitting. It lasts roughly 3 to 5 times longer and does not stretch: bolt holes stay round, flanges stay tight, and the shaft cannot move axially and hammer the center support bearing. The trade-off is a firmer feel, since the disc twists less.
How to choose a flex disc
Flex discs are selected by flange geometry and durometer — part numbers help less than expected, since one model often used several coupling sizes.
By size, bolt count and vehicle
Four dimensions do the job: outside diameter, bolt circle diameter, body thickness and hole count — usually three, four or six. Check sleeve bore and bolt size too. Demand is strongest on rear-wheel-drive sedans, body-on-frame SUVs, vans and tractors; the vehicle-type filter in the catalog narrows the range to your make and model. If your size is not listed, send photos and measurements of the worn coupling — we will match it or cast from your sample. Order fresh bolts with the disc — used hardware stretches.
By durometer
Standard durometer suits most passenger cars: comfort close to rubber, with the life of polyurethane. The firm grade is for higher torque and harder use — trucks, vans, tow vehicles, off-road builds and modified engines. It resists hole elongation longer but passes more shock into the body, so the hardest disc is rarely worth it on a street car. Shore hardness is listed on each product page. A firm coupling also sends load further down the driveline: check the U-joints and transmission mount before fitting one.
Product Photos
Why Buy a Driveshaft Flex Disc from PolyPro — Wholesale and Retail
PolyPro is the manufacturer, not a reseller: every coupling is cast in-house, so there is no middleman markup and no dependence on imports. We sell retail from one disc and wholesale to shops and fleets through our partner program. Anything not in the catalog we make to order from a drawing or a sample, from one piece. That is often the only option for older vehicles and tractors whose couplings are out of production. Products carry a warranty and ship worldwide, and because the molds and formulation are ours, sizes and durometer repeat exactly batch to batch.
Frequently asked questions
What is a driveshaft flex disc?
A flex disc, or guibo, is an elastic coupling with steel sleeves molded into it that bolts between the transmission output flange and the driveshaft. It transmits torque, absorbs shock during launches and shifts, allows for slight misalignment between the shafts, and keeps driveline noise out of the cabin.
What are the symptoms of a bad flex disc?
Vibration through the floor between roughly 40 and 65 mph, a dull thump on take-off and when lifting off the throttle, visible cracks or delamination in the disc, and bolt holes worn oval. On a lift, twist the driveshaft by hand: excessive free play at the coupling confirms it.
Can I drive with a cracked flex disc?
Getting to a shop is usually fine; driving on it for weeks is not. A failing disc lets the shaft run out of true, which quickly kills the center support bearing, the U-joints and the gearbox output seal. If the body tears completely, the driveshaft can drop while you are moving.
Should I replace the center support bearing at the same time?
On a two-piece driveshaft, yes. Both parts damp shaft movement, wear at a similar rate and produce the same vibration at speed, and the shaft has to come out either way. Doing them together saves a second round of labor on the same job.
How long does a polyurethane flex disc last?
About 3 to 5 times longer than a rubber one. Polyurethane does not swell in oil, shrugs off road salt and freezing temperatures, and does not crack with age or ozone exposure. Just as important, the bolt holes stay round for the life of the part, so the flanges do not work loose.
Can I order a single flex disc, or is there a batch requirement?
Retail orders start at one piece. A single coupling for your own car is a normal order, and the same holds for custom work: a disc made from a drawing, a sample or your worn part can be produced as a one-off. Wholesale terms are a separate track for trade buyers and do not restrict single-part orders.
Do you supply workshops and distributors wholesale?
Yes. Wholesale covers workshops, parts stores, fleets and resellers, and runs through the partner program: bonuses tied to turnover or to the volume of a single order, access to current prices, stock and shipping dates, and the option of shipping under the partner's own brand.