that 73 B front end twitch

This problem concerned a twitch when letting off the accelerator and again when giving it the gas again, the car has a quick movement from the front end and the drives fine. I did several measurements and, unless I can't use a tape measure correctly, the right rear wheel seems to be 1/4 inch further forward than the left wheel. Is this possible? Is the cheap single malt muddying the water? I checked all the u-bolts connecting the axle to the springs, they're tight. Any help would sure be appreciated!

Thanks again,

Steve

I call it the spontaneous lane changing feature. My '73 GT does the same thing. Chris posted earlier this week about replacing the leaf spring bushings as the fix for this problem...only later to discover his U bolts were loose.

The rubber spring pad has a bushing deal in it that locates the rear axle to the button deal on the bottom of the spring. If the rubber pads were worn I would think you could get the axle to shift.

Paul

cheap single malt always causes problems. cheap wine is cheaper.<G>

same effect, just less money, however IMHO. which is why my shop is not at home. <G>

you are saying the wheel base is different right and left?

eyeball the front a-arm, the frames where the lower kingpin ties in to the a arms. it is real common for the bolt holes to be elongated, they wear. cheap fix...replace the arms. don't mess with the "decambering" arms. stick with stock. I have wide skins (195s) and no noticeable cross tread wear issues with stock arms.

but the point in the attachment holes need to be round. not oblong like most old ones are.

if these are not worn (the holes are not elongated...you may have to remove bolt to see) then the discrepancy is likely at the rear and the axle has shifted a bit. that, too, is common. the fore-aft location is via a pin on the spring pack. and the related bits.

addendum to Mac's comment: when replacig the A-arms also replace the lower trunion bolts. When sized properly these bolts are almost a press-fit to the a-arm holes.

You could also have issues with your crossmember pads or the locator pins are loose and/or worn.

At the rear you could have a broken, bent or missing locator pin in on of the leaf-springs.

I wasn't aware that they even distilled a "cheap" single malt?

Newt

I have found that unequal tire pressure, especially on the back of a rear-wheel drive car, will cause the scenario you are describing.