Parts for your 1991 Mitsubishi Pajero-Centre bearing

1991 Mitsubishi Pajero centre-bearing — fitment, purpose and servicing

Technical sources confirm a centre-bearing is fitted to many 1991 Mitsubishi Pajero models, but not all. The Mitsubishi Pajero NH–NJ Workshop Manual (Propeller Shaft/Driveshaft section) specifies a two-piece rear tailshaft with a centre support bearing on long-wheelbase (LWB) models, while short-wheelbase (SWB) models use a single-piece tailshaft with no centre support. The Mitsubishi ASA electronic parts catalogue for 1991 NH Pajero also lists a centre support bearing and carrier bracket for LWB variants, and popular workshop guides such as Gregory’s/Haynes note the same arrangement. So, for a 1991 Pajero: LWB = has a centre-bearing, SWB = no centre-bearing.

Why SWB models don’t use a centre-bearing comes down to tailshaft length. The shorter one-piece shaft on SWB Pajeros doesn’t need mid-span support, whereas the longer LWB shaft benefits from a centre support bearing to control vibration and maintain alignment under load.

For LWB owners, the centre-bearing’s job is to support the two-piece tailshaft, keeping driveline angles tight and smooth as torque moves from the gearbox/transfer case to the rear diff. When healthy, it helps prevent shudders on take-off, reduces droning at highway speeds, and protects the universal joints and diff pinion from copping a hiding.

Common signs it’s on the way out include a low-speed shudder pulling away, a vibration that shows up around 60–80 km/h, a humming or rumbling under the floor, and visible cracking or sag in the rubber carrier. If left too long, the extra movement can flog out the uni joints and even upset rear pinion seals.

Replacement is straight-forward for a competent DIYer, but it does need care. Mark the tailshaft flanges and yokes before undoing anything so the phasing and balance go back exactly as they were. Support the shaft, separate the halves, and use a press or proper puller to remove the old bearing. Fit the new bearing in the correct orientation, reassemble to your marks, and tighten to the torque figures in the factory manual. On high-kilometre trucks, it’s smart to check the uni joints at the same time and replace if there’s any play or notchiness. After any bearing change, a driveshaft balance is good insurance against future vibes.

As part of routine servicing, give the centre-bearing a look every 20,000–30,000 km or before big trips: check the rubber carrier for cracks, ensure the bracket is tight, and keep an ear out for new noises, especially if the vehicle has a suspension lift that changes driveline angles.

• Listen for shudders, hums and droning under load.
• Inspect the rubber carrier for cracks or sag.
• Mark the tailshaft for phasing before removal.
• Use a press/puller, refit to factory torque specs.
• Balance the tailshaft after replacement if any vibration persists.

Popular questions about 1991 Mitsubishi Pajero centre-bearing

Does a 1991 SWB Pajero have a centre-bearing?
No. The SWB runs a shorter, single-piece tailshaft and doesn’t need a centre support. Only LWB models with the longer, two-piece rear tailshaft use a centre-bearing and carrier bracket.

What are the symptoms of a worn centre-bearing on a 1991 Pajero LWB?
Typical clues are a shudder on take-off, a vibration at certain speeds (often 60–80 km/h), a humming or droning under the floor, and visible cracking or sagging of the rubber carrier. You may also feel a clunk when shifting from drive to reverse if the bearing and uni joints are both tired.

Can you drive with a failing centre-bearing?
It’ll usually still move under its own steam, but it’s not a good idea. A flogged centre-bearing can accelerate wear of uni joints and the diff pinion, and persistent vibration can damage other components. If symptoms show up, plan a replacement soon and avoid heavy towing or long highway runs until it’s sorted.