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Rear drivetrain noise


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Hello all,

Was looking for some help in identifying a noise in my rzn149r 2wd 03 hilux dual cab. I seem to have a whining noise that appears to come from the rear of the vehicle. The noise only seems present after a lengthy amount of driving (ie approx 1+ hours) including some freeway driving. I have recently had new tyres fitted (budget brand) and also have recently had a rear axle seal replaced.

Thinking that maybe the noise could be coming from the cheap tyres ( focusvanti) as they heat up or from the diff. The code for the diff is A01A. Have checked oil level and it seems fine however have read that incorrect oil type could cause such noise. Unsure if this is an open diff or a LSD. Also can anyone tell me what oil i should use in this diff.

Any help would be appreciated.

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Almost certainly pinion gear mesh is worn or incorrect. Oil type can be critical, change it now to correct stuff and if it improves-well and good, but I doubt it. I suggest the pre-load is incorrect at working temperature. Tricky work, not for amateurs. BTW H M km? What loads/speeds? When changing brakes/wheel bearings, it's cheap insurance to do both sides of an axle together. Often saves a close second pull-down. U can remove diff, and get someone to adjust/rebuild it. Warning: Expensive job! Do propperly and don't cheapskate-or you'll do it again too soon. Check driving technique, that your not slogging or overloading the diff/g'box. They aren't quite indestructible. Towing big air resistances [boats etc] at speed/against the wind ain't good for anything. See v few boats with fold down screens/cabs/bridges--damn awful expensive crap to tow without it.

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Ta for reply.

Kms around 180,000. There is no load on the car but people (dont do any towing never really have). Only just noticed noise recently. Travelling under 100km/hr. However just finished a drive on the freeway at around the 100km/hr mark. As for drivng technique pretty mild. Generally use the car for driving around town, doesnt see much action.

I noticed you mentioned oil type. Can you recommend the correct oil to use and how much. Might try a change there first to see if any difference before looking to spend the big bucks.

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Final Drive 4.083

Differential Code A01A (Non LSD) A01B (Torsen LSD)*

Drive Pinion - Number of teeth 11

Ring Gear - Number of teeth 47

Ring Gear size 200mm

Driveshaft Diameter 26.50mm (A01A). 29.15mm (A01B)

Lubricant Capacity - Differential 1.35 Litres

Oil specifications Standard Non-LSD API GL5 Gear Lube

*Torsen LSD optional equipment.

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