Disco 1 tracking/alignment with adjustable back arms

hi all

You might guess that I’ve got some adjustable rear arms on my disco

A couple of weeks ago I did my tracking with some Dunlop gauges then centred the steering wheel which happily resulted in the steering box being centred as well which I know isn’t always the case, anyway it drove well. That aside, as standard my off side wheelbase (rim centre to rim centre) was 12mm longer than the near side so when I fitted my length adjustable rear trailing arms we dialled out the difference so now the wheelbase measures exactly the same on both sides. However now it pulls to the right which is understandable after wot we did and it also feels almost a bit twitchy, like it has keen turn in, but it’s nothing too bad and I’m thinking more about it pulling to the right. One thing I didn’t do as I ran out of ramp time was measure cross corners to see if the wheels are actually square (to each other ha) cos I’m sure as a lot of you will know parallel lines that are the same length don’t necessarily make a square, anyway really I’m just wondering wot people’s ideas are for getting it set up the best as I’m also sure most of will know about some of the problems people have when going to supposed tracking specialists where you either get sent away or your vehicle set up badly

Any experiences or ideas gratefully received

Thanks

Towsey

Arms on back should be same length as each other and adjustable a-frame alters angle of diff to align better with transfer box.
Can’t see any benefits from having adjustable length trailing
Any adjustments should be made to front axle to alter tracking.

Hi
I agree the arms should be the same, and they should be able to be the same. The arms are made for more flex and strength not to be adjustable it’s just a by-product of how they are made, I would of thought having the wheelbase the same on both sides was better than it been half an inch out, I’m not trying to use the back axle to adjust the front tracking, and they could also be used to adjust diff angle but I’m not trying to do that either. It’s no secret that Land Rover tolerances arnt the closest and there’s 7mm difference between the front and rear arm outriggers on the near side and offside leading to the difference between wheels

Towsey

It sounds like you’ve created a bit of rear wheel steer by lengthening the arms.
If it was me I’d put them back to same both sides as you said it drove better.
Then have tracking set on front axle

Yeah, or it had the rear wheel steer before when the measurements were out but it was set up to compensate for it and now it’s rite but needs setting up to be rite. I’m sure if it drove well before then it can drive at least as well now, and yes if all else fails il put it back as it was but was just looking for ideas

Towsey