troopy steering/ the truck whisperer

Unless the mechanic puts in adjustable King Pin bearings to the vehicle there is not much and alignment can alter apart from caster.

If they set it when it was relatively unloaded and you use it fairly well loaded, then the caster setting will have increased further Positive, eg Kpin leaning back more because of the rear being down on the springs.
This will give the same effect as a supermarket trolley if you push the side of it and the wheels tent to turn to the side.
On a crowned road, most are, the vehicle will gravitate to the left because the forces are pushing the Kpin to the left and the wheels will turn left. They are a caster wheel after all.

To test this you would have to travel on the wrong side of the road to see if it steers right.
If this is happening you have too much caster as a result of the initial setting of caster not allowing for the load change.

If it is not this it could be rear axle centre bolt broken and axle shiftes slightly, Front centre bolts the same story or loose/worn bushes front or back.

If the vehicle leans to one side eg left, then it might steer right because of the longer centre distance on the lhs spring leaf. This steers the axle to the right.

Has to be one of these things other than a bent chassis.
Any mechanic with a little understanding should be able to find the reason.

I hope this makes sense to you. It is simply a balance of forces. not rocket science.
Ross M

My '75 never pulled left until I replaced the tyres a month ago and the co. did the alignment.

They mentioned that the vehicle will pull left as a result of vehicle manufacturing issues [?] , including misalignment of certain welds in the rear of the vehicle , or something to do with steering telemetry.

I would like to elaborate for you , but I was paying only half the attention that I should have due to other things booked in to be done on the same day.

All I know is that she does pull left quite noticeably , but seems to straighten up on the right hand side of the road or if on a very low camber section. It also seems ok when bus van is loaded.

When I replaced the rubber , I noticed that the fronts of the old set were very scrubbed, so i guess they were aligned to drive 'correctly'.

Mate I'm surprised you didn't phone and said it's only happened since I've driven your car. LOL.

Didn't you get a realignment when you had the new suspension fitted?

G-Day Sludgie after many wheel alignments at various places , and scrubbing out front tyres I was told about the truck whisperer in a free camp in WA.by a bloke. who had his troopy dealt with by the truck whisperer ,and when we were passing through Benella VIC.,I took my 2008 hilux 4x4 to the truck whisperer. and I have now done 30,000klms the difference it has made to my hilux is amazing ,no more scrubbing tyres no more wandering over the road .i believe the truck whisperer man goes to PERTH on a yearly basis. best money i ever spent and good luck.