55.2-59 Mustang ii help axle centerline

[Missyblue]

Curious of thoughts. Trying to decide on my new axle centerline. Original was 28.5 inches back. I have read that many move them forward at least 1 inch to center tire when lowered. Heres a mockup of 27.5 I think it looks close. I prefer too far forward than back. The maroon truck is my exact mustang ii set at 28.5 and I find the gap in the front too large so want to move forward. I know the red is slammed I know but looks better centered. Any advice/tips. Thanks

[Rickysnickers]

The blue truck looks just right! Now is that your ride height and the wheel and tire size you are going to use?

[Missyblue]

Originally Posted by Rickysnickers

The blue truck looks just right! Now is that your ride height and the wheel and tire size you are going to use?

So the ride height will be like the maroon truck so the tires will be a little higher in the fender. But we couldn't get the bar any higher so this is on the level but a little low. And tire size will be this or close just depending fitment. I'm staying. With 15's

[MiraclePieCo]

Can't tell if those trucks pictured have the wheels straight ahead. Even the slightest turn of the steering wheel makes the tires appear way out of center.

[mr48chev]

I'm going to say that the red one is close to 2 inches in front of the original axle center line but it may be a subframed truck rather than a MII style setup.

One of my buddies did so many subframe swaps over a 25 year period he lost or quit counting. He would set the axle center line an inch in front of the original and that seemed to look pretty good on the ones that I saw that he did.

It's still your personal preference as to where you set them. It is what looks best to you.

I have to agree that it is super hard to get the front end on an AD or TF set so it looks good parked with the wheels turned a bit. It's one of those little nitpicky things that always bugs me on my own rig.

[dsraven]

you need to know the tire size you will use for the final so you mock it up with that diameter of tire. same for the rear, or at least have the truck sitting on stands at the rake angle you want it to be when done. this is because the cross member needs to be installed level at ride height, fore and aft as well as side to side. the lower control arms need to be level in the same manner at ride height. do a frame check before you start looking for out of square and sag. put the stands under it so it will not teeter totter when the weight of the front suspension is removed and also so you have room to work. use a digital level if possible because they are a lot more accurate than a bubble level.
what suspension kit did you go with? just curious because I think some people get sold a suspension kit with drop spindles and it ends up lower than they thought it would be. a MII is gonna drop the truck some to begin with. it seems like the parts guy has his version of what people need for the look that HE likes and then pushes/sells that version more often than others simply because it's what he likes. then the new buyer gets hooked because it's "what everybody is putting in". well, everybody is putting it in because thats what he sells them. some are not happy with the lowrider stance because it bottoms on every curb and it also involves a "C" notch in the rear suspension and possibly a bed floor height rethink.
anyway, long story short, do some research into what will get you the ride height you want and also think about how you plan to drive the truck and on what kind of roads.
attached are some pics of my TCI cross member and how it I installed it. turned out the crossmember was either cut wrong or was the wrong one for my truck-shipped wrong part. not a bunch of help from the vendor or the supplier so I had to figure it out myself as far as what angles were needed etc. another question to ask from your perspective, before purchase. a dimensional drawing would be good showing pivot point spacing etc, I never got one with mine. pics show stock axle center line and 1" ahead of stock. the tire is a 225/75r15. TCI MII kit with 2" drop spindles. possibly not at the same height as a normal TCI unit because I had to trim the cross member to fit my frame.
when assembling use a long level or straight bar and place across the lower control arm pivot bolts to check for side to side level. don't rely on the cross member being made to exact dimensions. also, if you can, get some long rods the same dimension as your lower control arm pivot bolts so you can assemble the parts using the rods which will be longer than the bolts would be. this will enable you to have the rods sticking out of the holes far enough to place a level on them to check fore to aft level of the cross member. again, don't rely on the manufacturer getting that precise when the steel is folded over to make the box of the cross member. if you haven't bought a kit yet I would seriously look at a cross member kit that has the upper and lower control arms welded onto the member already instead of in separate parts that you need to locate and weld on. that way the dimensional geometry work is already done for you and you simply need to locate the cross member and level it, tack it in, then assemble the parts to a mock up stage and see if you like the look in your fender openings. the pics show the home made tool I used to hold things together during mock up. you can't see it in the pics but there is bracing at the frame behind the front bumper as well as cross bracing under the cab. I also built a "caliper" to check the frame rail width periodically to ensure stuff stayed where it should be. one pic shows the suspension assembled with a magnetic digital level on the caliper. notice the upper control arm angle is upward towards the frame? it should be level or downward slightly. otherwise when the truck goes over a bump the tires will angle outward as they go up until the control arm is level, then angle inward after that. this could cause tires to rub if they are already close to the fenders with the wheel offset choice or axle centerline choice. one pic shows the stock axle centerline and the other is one inch ahead. remember that there is quite a bit of room for adjustment so if the mock up isn't done right the alignment guy may move the axle centerline by doing caster adjustments. thats why it is important to get the angles as close as possible during mock up.
yeah, I know, there are lots of guys out there who have done these with a bubble level in a dark garage and a flux core welder. "they drive just fine". in the end it is up to you but some home work and forethought can go a long way in getting what you want. before welding in do a complete suspension travel check with the tires turned all the way-both ways- just to ensure the tires don't rub on the fenders when wheels are turned and you go over a bump.
tip, center punch a mark on the frame as a reference before the old suspension is taken out so you know where the stock axle sat. usually referenced from the center of the stock front spring pivot ahead of the axle. center punch a mark on both sides so your checking is always from a given point, not an eyeballed point.

[slammed57]

Dsraven is spot on. Here’s mine 1” foward it a 245/45/18 tire if you go 20s I would only move it .5-.75 foward in my rear I moved the rear back .5 inches

[dsraven]

Just to be clear, the wheel size isn't as important as the tire diameter. Try something in the 28 inch area and see if you like that.
Tire size converter site has good info and a comparison tire next tire along with speedo calibration info.

[Missyblue]

Originally Posted by slammed57

Dsraven is spot on. Here’s mine 1” foward it a 245/45/18 tire if you go 20s I would only move it .5-.75 foward in my rear I moved the rear back .5 inches

Did you or dsraven have to do any backspace in your wheels?

[71'tahoe]

Following. I'm getting ready to start on my frame.

[Missyblue]

Thanks for all the help. The kit I bought is the one in the maroon truck made by a local company fulltiltstreetrods
I have the hub to hub coil spring kit. Wheels are 15 and tires currently are original 235/75 which is going to stick close to pending room once it drops. The whole rake angle variables seem impossible to figure out haha. Tire size variables and flipped axles drops how far ???? Variables.....and so thatsba tough one for me at the moment. This kit supposedly he says to not stress about that just stress about left to right and it will align just fine. That's TBD I guess
I'll post as I go. I have a gmc so I have to trim my crossmember and keep part of it for my core support so waiting on the tools on that before I proceed.
Sounds like most guys do the 1 to 1.5 forward and my dad says we dont need to reinvent the wheel haha so probably gonna stick in that area.
Slammed57 and dsraven if I can get mine like yours I'll be happy
Thanks again for the advice

[slammed57]

Originally Posted by Missyblue

Thanks for all the help. The kit I bought is the one in the maroon truck made by a local company fulltiltstreetrods
I have the hub to hub coil spring kit. Wheels are 15 and tires currently are original 235/75 which is going to stick close to pending room once it drops. The whole rake angle variables seem impossible to figure out haha. Tire size variables and flipped axles drops how far ???? Variables.....and so thatsba tough one for me at the moment. This kit supposedly he says to not stress about that just stress about left to right and it will align just fine. That's TBD I guess
I'll post as I go. I have a gmc so I have to trim my crossmember and keep part of it for my core support so waiting on the tools on that before I proceed.
Sounds like most guys do the 1 to 1.5 forward and my dad says we dont need to reinvent the wheel haha so probably gonna stick in that area.
Slammed57 and dsraven if I can get mine like yours I'll be happy
Thanks again for the advice

just keep chipping at it and you'll get there. life always gets in the way... family, house, job, low on funds.... just keep getting out there and results will show.... when the funds are low there are a ton of thing to address that just cost some welding gas and grinding discs to keep you busy.... I'll be watching brother .... going to car shows always keep my motivation

[Missyblue]

Originally Posted by slammed57

just keep chipping at it and you'll get there. life always gets in the way... family, house, job, low on funds.... just keep getting out there and results will show.... when the funds are low there are a ton of thing to address that just cost some welding gas and grinding discs to keep you busy.... I'll be watching brother .... going to car shows always keep my motivation

Yes for sure! Spent my whole summer sanding and trestimg rust on her belly and inner fenders while I saved for this step! Thanks for the encouragement. Patience is a virtue haha

[dsraven]

the pic in the earlier post of my 57 GMC is using the stock aluminum wheels from an S10 4x4 blazer.
I really suggest researching indepenent front suspension angles and geometry before tackling the weld in. it will help you understand what it is you are trying to accomplish in the end and also how everything works together to keep the wheels tracking properly and not rubbing fenders as the wheels travel through their arcs when going over bumps etc. even something simple like an upper control arm installed at the wrong angle can have an affect on if the tires rub the fenders going over a bump at a slight angle turning. since upper and lower control arms are different lengths they travel through different arc lengths so the vertical angle of the tire will change as the wheels move up and down. a lower control arm installed level at ride height coupled with an upper control arm installed with a down angle to the ball joint will cause the wheel to move out at the top, untill the upper control arm becomes level, then in at the top. the lower control arm will move the lower ball joint inwards as the suspension travels upwards.
make sense?

[bobinbc]

Good explanations above, I will say that in addition to rake and ride height I found that the wheel and tire size makes a difference in the look as well even when the tire is the same overall diameter. In the end I went with about 1.25" forward of the stock location with a 17" wheel. The pic with the roller is 1.75" forward on a 16" wheel.