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Mustang Technical Discussion > Pre 1973 > 68 castor/bush question > Community Forums > Mustang Forum Australia - Mustang Tech

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trav68
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Hi,
On my 68 Fastback power steering ( 17x8, 4,75BS, 235/45 tyres) I get some rubbing front of wheel well when turning at low speed. Seems less noticable at speed on the road but probably dont use as much lock when compared with parking.

WA suspensions (being the recognised local ford experts) did the alignment ( 5deg positive castor and one alignment shim in UCA front bolt preinstalled by me). When I installed the suspension I discussed adding more alignment shims to the top bolt but they recommended not going greater than 1 as the mating surfaces go out of square. Overall steering/handling is quite nice at moment.

I also replaced a factory style rubber castor bush with a less substantial looking repo ( scott drake I think). I have a hunch that the repo castor bush is not as stiff as the factory bush hence allowing some castor rod movement back and forth maybe contributing to my rubbing - does this sound plausible?

Options:
- replace castor bush with a MOOG oem style rubber bush or a soft poly ( like super pro)
- wind back threaded adjustment and sacrifice some castor
- as above but pickup the difference with the extra shims on UCA bolt

CHeers,
Trav


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jas24zzk
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Trav,
the first thing you need to do, is locate where your rubbing is occuring.

The suggestions you are making, will merely cost you money, not probably not correct the problem.


Jason Pigdon
Pigdon Automotive Services
Historic Smash Specialists
3/1 Burgess Road, Bayswater Nth, Vic.
(03) 9761-4801

PS: Forgive me for I was jilted by peterp

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jas24zzk
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I also replaced a factory style rubber castor bush with a less substantial looking repo ( scott drake I think). I have a hunch that the repo castor bush is not as stiff as the factory bush hence allowing some castor rod movement back and forth maybe contributing to my rubbing - does this sound plausible?


This is not plausible.
Slow speed is the lowest load that the bush will encounter, until undulations are factored in.
A softer bush will give you a slighty smoother ride, at speed, trading off geometry changes which in the worst case can lead to bump steer/tramlining. But as i said, worst case.

The problems with a harder bush are more inane. Sure you get a more postive control over suspension geometry, but the harder you go, the less the bush has the ability to absorb shock. If the bush cannot absorb the shock, then it transfers it directly to the frame. Unless you are racing and require that level of precision, a softer bush is much better for your car.

Remember its 40 years old, no way in hell will it EVER handle like your new BMW.

After this, refer my previous post.

Jas


Jason Pigdon
Pigdon Automotive Services
Historic Smash Specialists
3/1 Burgess Road, Bayswater Nth, Vic.
(03) 9761-4801

PS: Forgive me for I was jilted by peterp

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trav68
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I know where it is rubbing ( looking at drivers LHS front wheel) it will be at 9 o'clock position on wheel circumference. Its just brushing it a bit.

Obviously I dont want to sacrifice castor. I remember looking at the bushes when I put them in and doubting whether they were going to be as effective as the oem style I took out. I notice MOOG make a bush which looks like the Ford item and I was under ponyrides ranchero and noticed a decent looking blue poly bush ( which looks like a WA suspension fitment)

I know there is a fair bit of castor (for/aft) motion under braking not sure how might be seen during low speed turning. This is why all the commodore guys ( me included) got rid of the factory oil filled castor bush. Car felt heaps better under braking since I did that mod.

That said if the general consensus is that at low speed neglible for/aft movement will be seen on that bush then I wont waste my money and just adjust the castor via thread and shims.

Trav


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Exhausted
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I remember ozbilt mentioning something on this topic. Cut off approx 1/8" from the castor bush tube to allow them to be compressed a bit more ??


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trav68
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Peter,
I did read Ozbilts tutorial and shaved 1/8" off the inner steel sleeve however I reckon this is only really relevant if you use a factory type bush.

The commonly available repos look pretty crap in my opinion but that was all I had on hand at the time (other than reinstating the originals).

I was going to do the 3x1/8" shims in the UCA bolt as per Ozbilts post but Rod from WA Suspensions was against it as per my previous comments. With a 3/8" shim stack you are out of square over that distance. However, it would allow the LCA to be moved back in the wheel well a touch ( to achieve the same castor geometry) and hence probably fix my problems.

Bit of a WA Susp vs Ozbild dilemma hear. haha

Trav.


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ozbilt
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Replace the front locating bolt of the top A arm with one that is 3/8" longer & place 3 X 1/8" shims in that spot. Then your caster bar (good that you have taken the 1/8" off the tube!) will be set in about the mid range of adjustment.

Tyre will not rub as it will be centered on the arch & you will have at least 8 degrees of caster.

65/6 Mustangs had heaps of shims on the top arm (as did early Falcons) so the idea of mating surfaces being out of square does not wash. You do have to make sure the nuts are torqued correctly.... Read the Manual

If they will not do it, go somewhere else.


Kerry

"Thank you Boofhead for the wonderful memories"

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trav68
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whats the chances of getting the bolt out without compressing spring, removing UCA etc. Any bush mechanic tricks to temp supporting the arm to replace the bolt?


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Shaunp
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Trav don't worry about extra shims, all pre commodore holdens are done this way so to Jaguars, and pre 67 mustangs. If it's good enough for a Jag it's good enough for a mustang.

You can buy the rubbers here, but most place will want to sell you Nolethan. The good quality rubber ones are made loacaly by Mackay, ask for them by name.


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MrsBLKPNY
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We stock the Mackay bushes, as well as the Drake items.
Drake offer 2 different bushes, OEM and Heavy Duty.

If you're interested in a set, I can rig up some sort of comparison.


Living the Dream Working with what I love!

www.custommustangs.com.au
We stock a large range of stock for all models.
Feel free to contact us if you have any questions or enquiries.
sales @ custommustangs.com.au
03 9782 8850
0438 351 400
2/14 Lakewood Blvd
Carrum Downs Vic 3201

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