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#2353105 - 08/13/17 07:29 AM Front end alignment with radials
robertop Offline
enthusiast

Registered: 11/25/03
Posts: 386
Some time back I saw a post that contained the specs for front end alignment in the case of having radial tires, but now I can't find it. Can anybody help with those specs? They are different for cars with bias-belted tires, of course. Thanks, guys.

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#2353106 - 08/13/17 07:44 AM Re: Front end alignment with radials [Re: robertop]
ahy Offline
master

Registered: 01/22/07
Posts: 7259
Loc: IN
Specs I like are: camber -.75 deg, caster +5 degrees, 1/8" toe in.

These specs are hard to achieve with stock parts. The way OE adjusters are set up there is trade off between camber and caster.

Try to get at least some negative camber and some positive caster.

Positive caster promotes steering stability and "feel". Negative camber improves bite of the tires on turns.

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#2353134 - 08/13/17 09:31 AM Re: Front end alignment with radials [Re: robertop]
moparts Offline


Registered: 01/19/03
Posts: 13695
Loc: Norwich CT USA
Yes, when you alignment shop sets it to 30 year old specs and you wonder why it drives as bad as it does.

The spec above work good on all the older mopars !!
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#2353195 - 08/13/17 11:54 AM Re: Front end alignment with radials [Re: robertop]
Bad340fish Offline
master

Registered: 01/20/03
Posts: 5141
Loc: Tulsa OK
I have RMS upper arms and around +5.5 of caster. The car drives like a dream setup that way.
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#2353207 - 08/13/17 12:12 PM Re: Front end alignment with radials [Re: robertop]
cnxt Offline
master

Registered: 05/12/05
Posts: 3253
Loc: Florida
Most shops need something to put in the machine, 2007 Mustang matches specs posted above.

05 Mustang GT specs are -.75* camber, +7.1* caster ( which you wont achieve with a mopar, but take as much as they can get while offsetting the camber spec) and .1* to .2* toe in , which on a 26" diamter tire, is right about 1/16" total toe in. I know there are some shops out there that will only use the specs that are in their computer and they will not tackle a customer provided number. Using Mustang specs give them a late model input and a target to shoot for.


Edited by cnxt (08/13/17 12:22 PM)

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#2353516 - 08/14/17 08:48 AM Re: Front end alignment with radials [Re: robertop]
Mattax Offline
super stock

Registered: 02/28/10
Posts: 831
Loc: Phila. Pa.
A couple of things have changed since the car was built. Yes one is the tires and the other is the roads. High crowned roads were common and aren't anymore (depending somewhat on where you lived). Because of the crowning, and maybe to somewhat account for driver weight, the right, left specs for caster and camber were different.

Radial tires have more sidewall give than bias or even cross bias tires. They tend to like a little more negative camber for cornering.
For your car, without doing further mods, you can have them:
1. use the most negative camber setting
2. Get the most positive caster setting.
- use the specs for a Power steering car even if you have manual steering unless you find the steering wheel to difficult to turn.
- They must recheck the camber and caster setting. Most guys today do not have the cheat sheets or experience in doing these dual cam adjusters to avoid changing the camber when setting caster.
3. Set toe to factory. If your tires a larger diameter than factory than use a degree setting or at least the max toe in inches.

Before starting the alignment, the ride height must be within spec.

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#2353898 - 08/14/17 07:55 PM Re: Front end alignment with radials [Re: Mattax]
elmor353 Offline
mopar

Registered: 06/28/13
Posts: 488
Loc: Oregon, U.S.A
I am having alignment problems after rebuilding the front end on my 77 D-100 swb pickup. I drove it to the alignment shop and couldn't keep it on the road after they set it up. I took it back and the guy had set it for bias ply tires. They reset it for radials and it was better, but it's still back and forth on the road.

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#2353956 - 08/14/17 09:39 PM Re: Front end alignment with radials [Re: elmor353]
Supercuda Offline
I Live Here

Registered: 09/04/07
Posts: 11962
Loc: West Texas
Finding a good alignment shop can be harder than getting a good alignment.

Seems you found that out.
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#2353962 - 08/14/17 09:46 PM Re: Front end alignment with radials [Re: robertop]
Dixie Offline
top fuel

Registered: 06/24/08
Posts: 2078
Loc: Ball Ground, Georgia
Good stuff, I need to get 2 old Mopars aligned.
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#2354667 - Today at 03:26 AM Re: Front end alignment with radials [Re: robertop]
383man Offline
Too Many Posts

Registered: 01/19/03
Posts: 26250
Loc: Balt. Md
Heck with a stock front end its tuff to get even 2 degrees of positive caster. I put as much positive caster in my 63 as I could when I aligned it and 2 degrees positive caster was about the most I could get out of it with the stock front end parts I use and setting the camber from 0 to .5 negative. I run my toe about 1/8 toe in and I run radials front and back. And it handles good as it drives so much nicer on radials. I like the radial slicks at the track also as you run more tire pressure in them then we did on the older bias slicks as I run about 18 psi in my radial slicks at the track and it goes nice and straight. With the older bias slicks most cars would wonder a little at the top end. Course we used to run them from about 6 psi to about 12 psi. Its also so nice that radials dont follow the lines in the road like bias tires. You run radials on an old muscle car and compared to having bias tires on it the car will feel like a different car since the radials drive so much nicer. Sometimes I wonder how we drove our older cars on just bias tires back in the day ? Ron


Edited by 383man (Today at 03:28 AM)
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