Looking for some opinions on the required amount of link separation on a 3-link setup. The only general rule of thumb I've found repeated on the internet is to have the vertical link separation at the axle as 25 of tyre diameter. This sounds reasonable and would mean I should be looking for around 9.25" at the axle.
So my main question then comes down to the separation at the chassis. I have yet to mind much information out there on this, only one reference to chassis separation being 2/3 of axle separation. Is there a rough rule to aim for? Or do I need to just go with where the links fit and see what numbers that gives me?
I'm also looking to triangulate the two lowers at the chassis end as this will do two things, reduce some of the load on the panhard rod and its also supposed to reduce axle walk. Has anyone got any experience of this?
Upper link angles... I remember Bill saying that an offset left upper link will counteract torque roll of the body, does that depend on which way the link slopes? eg up or down to the axle from the chassis mount. I will add that I have absolutely NO space on the drivers side for an upper unless I do away with the diff and/or the engine mount
Length of the uppers... the internet seems to suggest 75% of the length of the lowers as a general rule, I believe to mean the squat stays the same during travel? If I go longer on the length of the upper, I'll have less pinion rotation down and keep it pointing more towards the transferbox. Thoughts on this? I've got a wide angle GL/GKN prop but I'm sure sure how much it can cope with angle wise. Others suggest keeping the length similar to the lowers.
Now for a brain dump of the thoughts I'm having at the moment, any comments are welcome : (I should add that I've yet to take a tape measure to the chassis, but this is one of the next steps)
- Building a reinforced gearbox cross member to take the link mounts, keeping the lowers as tucked into the chassis as I can without sending the antidive sky high.
- The reinforced (complete new build) cross member would be linked to a smaller cross member mounted from the holes in the chassis that the gearbox mounts use. That cross member then supporting the gearboxes and spreading the suspension loads back down the chassis.
- Getting the upper single link on the passenger side as far up from the axle centre line as I can, dependent on space at full bump.
- Build bolt on mounts for the lowers that pick up on the radius arm mounts (to allow me to revert to them for longer trips or if I'm doing lots of road milage).
- Along with the previous one, one option is to build link mounts from a Gwyn Lewis style track rod guard, linked to the radius arm mounts.
- Looking at the trail gear 'creeper joints' as they can be easily sourced in the UK from Off Road Armoury and have a little compliance in them. I'm not sold on the idea of a heim/rose type joint due to the inherent harshness given that its a multipurpose vehicle.
- Looking to build in some adjustment at the mounts where I can, more than likely the uppers with maybe an inch of adjustment either way of the 'main' position. Not sure if I can build much, if any, adjustment into the lowers without making the mounts hang down a long way.
- Aiming to have the truck as close to standard height suspension as I can so I'm aiming to be at standard height upto +1", with an absolute max lift of 2" (suspension.... tyres will give me 2" of height over my old BFGs)
I'd rather the thread didn't wonder off into suggestions of a one-link, unless the discussions remain informative towards the 3 link if that makes sense. 3 link is what I'd like to go with.
I think that's all for now .