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Old 08-06-15, 09:46AM   #1
Zedo
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Default best OEM steering box for GM A & F bodies ?

what's the best steering box swap ?
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Old 08-06-15, 11:31AM   #2
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Depends if you want a quick ratio or the standard steering ratio.
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Old 08-09-15, 10:24AM   #3
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talked to a steering box rebuilder.
he said the box ratio is generally controlled by the worm gear ratio
not whether it's variable or constant rate.
the early Pontiac GTO gear boxes, were like steering a sailboat
17:1 ratio from 1964-68
1969 had 15:1
1970-72 had 14:1 variable (16:1 center, 12.7 off center)
I have one apart here. it has a big tooth in the middle of the pitman shaft
that centers for high speed, straight line driving, i.e. highway cruising, drag racing
and gives high stability
the later "quick" ratios, were 12.7:1 ratio
all the teeth on the pitman were equal size
that makes it corner faster, but is "twitchy" on a straight line, as any slightest movement of the wheels or steering box, makes it dart or dive.
for drag racing, we're all better off with variable ratio

now the really interesting part
the lock to lock rating, is set simply the END CAP on the steering box
it is thicker, and stops the worm/piston inside sooner, limiting lock to lock travel.
otherwise it's the same darn steering box more or less

and that's not all

use a thick cap, to limit lock to lock turns, you lose TURNING RADIUS.
a stock GM GTO steering box has 87 degrees lock to lock on pitman arm
a later "quick ratio" or early Z28 box, only has 64-67 degrees
they are made for SMALLER CARS.
to use the thick cap, and short radius resulting from it, the car needs longer idler arm, pitman arm, and spindle arms, to recover some turning radius

the A-body G-body and full size, need a large turning radius
otherwise you need a 4 lane highway to do a U-turn, and it's K-turn city
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Old 08-09-15, 12:34PM   #4
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Friend had the quick ratio on his firebird. He did not like how sensitive it was. You sneeze and the car switched lanes....lol
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Old 08-15-15, 09:06AM   #5
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that's what I'm talking about
the variable has a big center tooth on the pitman shaft gear, to hold the car steady straight line driving
here's a variable box pitman shaft gear

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Old 08-15-15, 09:15AM   #6
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maybe Gach can downsize that for me. tried like hell but I could not
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Old 10-01-15, 07:30PM   #7
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I have the Lee 12 to 1 in my 64 Bonneville... You need to run a lot of positive caster with them. Best to find your king pin inclination and run that much positive caster.. That way it will feel like a manual box going down the road but much faster and no parking issues..

I'd like to find out what kind of box my 2001 3500 Chevy work truck has, it's just as nice as the Lee...
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Old 10-02-15, 04:16PM   #8
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Years ago when I was short track racing. I would install the Corvette main gear in my manual box. But it is shorter and had to modify the steering column to make it work. Got rid of the rag joint. All the boxes are basically the same with the same bolt pattern with the same ratios, the difference being the pitman arm used for the right application
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Old 11-28-15, 05:01PM   #9
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Ive read someplace where S-10 chevy trucks are a bolt except for Pittman arm???
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Old 11-28-15, 05:55PM   #10
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"Friend had the quick ratio on his firebird. He did not like how sensitive it was. You sneeze and the car switched lanes....lol"

He musta had some bad allergies! LOL

I'm using a box from an 81 WS6 and I'm OK with it.
It is not that touchy,but if you are not used to it............
You have to stay awake & not be fidgeting around with the radio or I phone though.

Drive an MG Midget.
3 turns LtL.
Now that's some touchy steering!
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Old 11-29-15, 10:49AM   #11
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Not bad alignment just to touchy.
Since then he has changed it out.
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Old 12-02-15, 09:21AM   #12
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This will fix the touchy steering..

http://www.borgeson.com/xcart/produc...id=1684&page=1

Alignment plays a very big part steering feel.. Crank that caster up to +6-7 degrees with 50 minutes of negative camber and you'll have a canyon carver..

Check out the video on my car at 130+ with 5-6 degrees of positive caster..
https://www.youtube.com/watch?v=xZihzBMaKxg
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Old 12-03-15, 12:42AM   #13
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Thanks for posting that ,I love it.
God that takes me back.
Reminds me of my old '63.
I had it set up.
It cornered like it was on rails.
Had my gauges placed almost the same way
Sometimes I wish I still had that car.
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Old 12-03-15, 09:05AM   #14
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Thanks Sprint..
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