I need the steps to adjusting the camber on the rear of a 93 ford thunder bird. the tires are leaning in a the top and wearing the tires on the inside.

To adjust the camber, loosen the inner lower control arm cam-bolt nuts and adjust the cam-bolt to the correct specification. You will need to safely raise the vehicle off the ground to make the adjustment, However you won't get a true reading of camber until the vehicle is back on the ground. I would suggest SMALL adjustments then get BOTH sides checked for the camber alignment.
By twisting the bolts in the lower arm the offset collars on them shift the lower arm in and out to correct the camber.

take to shop, its cant be done without special equipment

2.5 degrees negative camber is not within spec. You need new control arms in the rear. These will set your camber back to the factory setting and reduce your tire wear on the inner edge. The first shop you went to is correct, the camber cannot be adjusted, components must be replaced to rectify the excessive camber. Ive done a couple of New Style C70 rear control arms for this very reason, if your vehicle is under warranty however, the dealer needs to be able to prove that the car needs it. So if you dont have wear on your tires and when the toe was set it readjusted the camber (when you adjust toe it affects camber and caster measurements) then they cant prove to Volvo that it needs the control arms. I hope this helps

You will need an alignment. The strut is slotted to allow camber adjustment.If the tire is leaning in then the camber is excessively negative.

was your car in a wreck since you have own it?
that would be the only way anyone could bend steering or suspension parts.if your tires are leaning out on top,
it would be a part called"lower control arm assembly",
if you stand in front of your car with the steering wheel straight,and your tires are pointing in on each side,or pointed out instead of straight,that would be a "tie rod "
there is an inner tie rod and an outer tie rod end.
you need to take your car to a shop that does alignments,and have them tell you exactly what is wrong,you can even get lower control arm assemblies
from a salvage yard.but do yourself a favor and don't take your car to a MONROE or MIDAS type shop,they are only there to sell and make commissions! Find a normal shop that the owner is the mechanic.

Dear Leaning,
This is what they call a negative camber issue, caused normally by excessively worn or damaged parts.Since this is a 90 Ford Ranger this vehicle has upper and lower balljoits on both front sides.It would be best to inspect these first and make sure there is no play or excessive wear on them, after that make sure your coil springs have not become weakened.When that has become performed the last step would be to get an alignment on the vehicle.If the camber is not still quite in spec then this vehicle will require what they call camber correction slugs.....they install in the upper balljoint sleeve and are capable of being turned around so you can acheive your desired camber setting.Any questions get back to me, I HOPE I COULD HELP!!!

If you have run out of adjustment, perhaps you should consider replacing the bars. Essentially they are just a different kind of spring and over time they do loose tension. Obviously something is affecting your alignment or the tires would not wear!
What I fail to understand is that a shop can tell you it's not mis-aligned if the wheels have an obvious camber problem??!! Has anyone put it on an alignment machine?

the front end will need alignment kits installed that allow for the adjustment to be made to correct the tire wear, this has to be done on a alignment machine to set correctly, just eye balling it is not an option.

That's known as negative camber (positive camber would be if the top of the tire were leaning outward). This should be able to be fixed with an alignment as long as the suspension isn't damaged (ie, a bent control arm due to an accident or a hard hit on a curb, pothole, etc).

REAR WHEEL ALIGNMENT
TOE-IN : 0±2 mm (0±0.08 in.)
1. The rear suspension lower arm mounting cam bolt should be turned an equal amount on both sides during adjustment. Right wheel : Clockwise direction : toe-in Left wheel : Clockwise direction : ton-out Maximum difference between LH and RH : 3mm 2. The cam bolt should be adjusted within a 90° range left or right from the center position. CAMBER Standard value : 0°±30´ Maximum difference between LH and RH : 3mm : 0±2 mm (0±0.08 in.) 1. The rear suspension upper arm mounting cam bolt should be turned an equal amount on both sides during adjustment. 2. Install the left and right springs which have the same identification color. 3. The cam bolt should be adjusted within a 90° range left and right from the center position. TIRE WEAR 1. Measure the tread depth of the tires. Tread depth of tire [Limit] : 1.6 mm (0.06 in.) 2. If the remaining tread depth is less than the limit, replace the tire. When the tread depth of the tire is reduced to 1.6 mm (0.06 in.) or less, the wear indicators will appear.