Differential lockers
Three designs, one job: tie the half-shafts together so the wheel with grip gets the torque. They differ in what else has to go into the vehicle, and in where each works best.
Air, electric or Crab
The manufacturer gives one hint outright and we repeat it verbatim: it recommends the electric locker where it is cold and the air locker where it is hot.
Air
Closed by compressed air. Needs a compressor and lines. In return, one compressor serves two lockers and still inflates your tyres.
Electric (e-locker)
Closed by an electromagnet. Simpler to fit, with no air plumbing. It unlocks when you change direction and re-locks after about a quarter of a wheel turn.
Crab Locker
No seal housing — the most common failure of air lockers disappears. The manufacturer tested it for five years on eighteen vehicles. It costs more.
A manufacturer warning that must not be skipped: the electric locker's automatic release on a change of direction „may be dangerous” in the mountains, when manoeuvring on a climb. If you drive steep ground and change direction often, that argues for the air locker.
What TRE changed inside
Three features the manufacturer claims as its own, and which set its lockers apart from the simplest designs on the market.
X-Ring instead of an O-ring
A four-lobed seal rather than a round section — the manufacturer states twice the sealing surface of a standard O-ring.
Wave spring
Halves the spring height compared with a conventional coil, so the pockets in the clutch gear are shallower and the gear itself stronger.
Deeper engagement
On the electric version and the Crab Locker the locking depth went from the usual 2 mm to 5 mm. Gears in 4320 chromoly steel, nickel-plated on the electric version.
Available from us
Prices incl. VAT; the link goes to the product page in the Szekla4x4.pl shop.
Blokada przednia TR308 Suzuki Grand Vitara II 2005-
Suzuki Grand Vitara II 2005–2015
Blokada tylna TR307 Suzuki Grand Vitara II 2005-2015
Suzuki Grand Vitara II 2005–2015
Blokada przednia elektryczna Suzuki Grand Vitara II TE308
Suzuki Grand Vitara II 2005–2015
Blokada elektryczna tylna Suzuki Grand Vitara II 2005-2015 TE307
Suzuki Grand Vitara II 2005–2015
TR205 Blokada RD205 (RD73, RD75) Suzuki Vitara przednia
Suzuki Vitara
TR209 Blokada Suzuki Vitara tylna RD209
Suzuki Vitara
TR204 Blokada RD204 - Suzuki Vitara, Grand Vitara
Suzuki Vitara, Grand Vitara
Przednia blokada Suzuki Jimny 2003-2018
Suzuki Jimny 2003–2018
TR102 TRE4x4 Blokada Air Locker RD102 Dana 35 Jeep Wrangler
Dana 35 — Jeep Wrangler
Blokada Przód TR116 RD116 TRE4x4 Dana44 Jeep Dana M44 JEEP CJ, WRANGLER TJ, CHEROKEE XJ, COMMANCHE
Dana 44 / M44 — Jeep CJ, Wrangler TJ, Cherokee XJ, Comanche
tylna elektryczna blokada Jeep Wrangler JK TJ YJ CJ Dana44 TE117 30 spline
Dana 44, 30 wielowypustów — Jeep Wrangler JK, TJ, YJ, CJ
Blokada TR244 RD244 JL Wrangler Sport Sahara M200 tylna tylny
M200 — Jeep Wrangler JL Sport, Sahara
Blokada TR226 RD226 tylna JEEP WRANGLER YJ, TJ, CJ (5-8), CHEROKEE XJ, GRAND CHEROKEE ZJ, WJ, WK, WH, COMMANDER XK, XH TR226
Dana 44A — Jeep Wrangler YJ, TJ, CJ (5–8), Cherokee XJ, Grand Cherokee ZJ, WJ, WK, WH, Commander XK, XH
Blokada Tre 4x4 TR136 Nissan Patrol Y60 Y61 Terrano II przednia RD136 RD78a
Nissan Patrol Y60, Y61, Terrano II
Blokada Nissan Patrol Y60 Y61 Terrano II tylna TR135 RD135 RD17
H233B — Nissan Patrol Y60, Y61, Terrano II
Blokada LandCruiser 71 76 78 79 100 105 TR131 przednia RD131
Toyota Land Cruiser 71, 76, 78, 79, 100, 105 — most przedni IFS
Blokada LandCruiser 71 76 78 79 100 105 tylna RD152 TR152
Toyota Land Cruiser 71, 76, 78, 79, 100, 105 oraz Lexus LX470
TR212 Blokada RD212 tylna Galloper I i II Montero Pajero L200
Galloper I i II, Montero, Pajero, L200
Prices incl. VAT. With an air locker, add a compressor — without one the set is incomplete.
Frequently asked questions
Does a locker change how the vehicle handles on the road?
Engaged, yes — a great deal. A locked differential does not let the wheels turn at different speeds, so the vehicle resists steering, and on hard surfaces a locked front axle can pull straight ahead despite the wheel being turned.
That is why you engage a locker off-road and disengage it afterwards. Disengaged it does nothing — the differential works exactly as it did from the factory.
Front or rear, if the budget only stretches to one?
Usually the rear — that is where most of the torque goes, and a locked rear axle does not spoil steering the way a front one does. The front gives more in the hardest going but is also more awkward when manoeuvring.
It does depend on the vehicle and on where you drive. Tell us how you use the truck and we will answer for your case rather than repeat the rule.
What does fitting involve?
A locker replaces the differential, so the axle has to come apart and be set up again on reassembly — backlash and contact pattern included. This is not a driveway job.
An air locker adds the air system: compressor, lines and a feed into the axle through a rotating seal in the hub. We do this in our workshop in Warsaw — write to us and we will book a date.
Does the warranty cover damage after locking on tarmac?
No. The manufacturer explicitly excludes gear damage caused by improper use, and driving on a hard surface with the locker engaged is the textbook example of that.
The warranty on lockers themselves is 5 years — the longest in the whole TRE range.
Tell us your axle
The axle type and spline count decide everything. If you do not know them, send the VIN and a photo of the differential cover and we will work it out.