Steering Bump Stops (or whatever they are called) - Chevy Impala SS Forum
 
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post #1 of 3 (permalink) Old 09-18-2003, 09:54 PM
FakeSS
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I am having a problem with my tires rubbing the front swaybar when I turn the steering wheel all the way and it is eating up the inside edge of the tires (just replaced a pair that was down to the belts ).

This problem is on my '93 Caprice. I have '95 Impala springs, Impala wheels, and 255-50-17 tires. Obviously the rotational travel is too great with the wider wheels/tires.

What I need to know is: </font>
  • What is the device that limits rotation?</font>
  • Where is this item located on the vehicle?</font>
  • How do I go about changing it?</font>
  • Will the stock Impala part fit?</font>
I've looked through my FSM but when I'm not exactly sure what I'm looking for... well, you know how that can be. [img]tongue.gif[/img]

I figure that with all of the guys here running my setup and the guys that have gone to wider wheels/tires up front, somebody is bound to know the solution.

TIA
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post #2 of 3 (permalink) Old 09-18-2003, 10:46 PM
95wagon
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The Harpernator may have to chime in here but as far as I understand the larger stops that are spoken of are pre 91 pieces. Moot point though as they are NLA.
The factory Impala has the same stops on their lower control arms as the Caprice. They rub the bar at full lock as well.
If you have an aftermarket bar your problem may more severe than the OE cars.
If you can't train yourself not to hold the steering on the stops (which is not a good thing anyway) you will have to either extend the existing ones by grafting on a piece of stock or hunt down a set of early arms that you can cut the larger stops off.
Which years? Bill are you there?
Gerry
post #3 of 3 (permalink) Old 09-18-2003, 11:57 PM
Navy Lifer
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OK--the control arm stops are intended to work in conjunction with the internal stops in the steering gear itself. If there is any question about why there are so many different steering gears, it includes an effort by GM engineers to match the gear to the rest of the package--ride height, tire size, etc. I really don't know if the control arm stops are there to protect the steering gear, or to prevent the steering gear from "bottoming". I would be inclined to think the control arms are intended to contact first.

As far as the difference, yes, I have looked at many pre & post 94 control arms. I really am not sure what year they changed, but looking at the GM parts book, since PN's are multiple, and do not address the stop design, the 93 & later arms are the same PN, so that means the stop plate on each arm is the same on your 93 as the later cars--but the stops COULD be bent...be sure to check that possibility. The more significant variation, since control arms are no issue between your car and later cars, is the differences in the knuckles, which DO change in certain applications, depending on chassis spec or brake spec. The cast-in stop may be different, but I've never tried to figure that out.

There were add-on steering stop plates listed only for 1991-92 vehicles, which definitely had what I call the "early" style steering stops.

Here's some information to cloud the issue:

https://www.impalassforum.com/cgi-bin...=002243#000006

http://www.chevelles.com/techref/ftecref29.html

1985-96 Caprice, Monte Carlo, & Buick Fast Ratio Steering Gears


YEAR
ALPHA
CODE
ORIGINAL
APPLICATION
GEAR
RATIO
EFFORT
T-BAR
SIZE
TRAVEL

1985-93 (MC)
YA
Monte Carlo SS
12.7:1
24-30
0.204 Dia
39deg 15mIn

1988-89-90 (Chev)
WZ
F41
12.7:1
20-26
0.195 Dia
43deg 30min

CP
FE2
12.7:1
17-22
0.185 Dia
43deg 30min

1991 (Chev)
CP
FE2
12.7:1
17-22
0.185 Dia
43deg 30min

1992-93-94 (Chev)
CP
FE2
12.7:1
17-22
0.185 Dia
43deg 30min

FB
Police
12.7:1
20-26
0.195 Dia
40deg 45min

HL
Police
12.7:1
24-30
0.204 Dia
40deg 45min

1994 (Buick)
KL
FE-1
12.7:1
17-20
0.185 Dia
43deg 30min

1995 (Chev)
CT
FE2
12.7:1
19-22
0.185 Dia
43deg 30min

DU
Police w/FE3
12.7:1
20-26
0.195 Dia
40deg 45min

1995 (Buick)
FK
FE
12.7:1
17-20
0.185 Dia
43deg 30min

1996 (Chev)
TW
FE2
12.7:1
19-22
0.185 Dia
43deg 30min

MX
Police w/FE3
12.7:1
20-26
0.195 Dia
40deg 45min

KW
FE
12.7:1
17-20
0.185 Dia
43deg 30min

Another thing to look at is this:

http://ourworld.compuserve.com/homep...o_steering.htm

and scroll down to

"PART NUMBERS FOR GM REPLACEMENT BOXES"

It is fairly old information--and the numbers are suspect, and you can see that the steering travel numbers don't agree with the chart above.
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