Common 12-1 steering box

[dirt0]

What is the most common 12-1 steering box are they camaros or vettes

[Lizardracing]

GM/Saginaw quick-ratio steering box donor car cheat sheet

Late Model 12.7:1 quick-ratio gearbox
ID markings YA, WS and HX
Line Thread Size: M18x1.5 and M16x1.5
Number of Mounting Holes: 3, (missing leg H-pattern)
Input Shaft Diameter: ¾-inch
Output Shaft Diameter: 1 ¼-inch
Number of Turns Lock to Lock: 2 ½ - 3
1984-'88 Monte Carlo/Malibu with Z65 suspension
1983-'88 Malibu, El Camino
1982-'92 Camaro except FE1 soft ride suspension
1984-'87 Regal with FE2 or FE3 sport suspension
1983-'84 Hurst/Olds
1985-'87 Cutlass with 5.0 (VIN code 9)
1982-'85 Trans Am
1986-'92 Firebird except FE1 suspension
1986-'87 Grand Prix with FE2 touring or F41 heavy duty suspension

Pre-'76 12.7:1 quick-ratio gearbox
Line Thread Size: 11/16 x 18 and 5/8 x 18
Number of Mounting Holes: 4, (H-pattern)
Input Shaft Diameter: 13/16-inch
Output Shaft Diameter: 1 ¼-inch
Number of Turns Lock to Lock: 2 ½ - 3
1967-'76 Camaro, Firebird
1970-'76 Monte Carlo/Malibu
1964-'76 Chevelle

1977-'79 12.7:1 quick-ratio gearbox
Line Thread Size: 11/16 x 18 and 5/8 x 18
Number of Mounting Holes: 3, (missing leg H-pattern)
Input Shaft Diameter: ¾-inch
Output Shaft Diameter: 1 ¼-inch
Number of Turns Lock to Lock: 2 ½- 3
1977-'79 Camaro, Firebird
1977-'79 Monte Carlo, Malibu
1977-'79 Chevelle

[JustAddDirt]

good to know

I think any of those in the 80's use the o-ring line fittings for hydraulics (metric).
any of the 70's use a compression fitting for hydraulics.

[Lizardracing]

Both style's have AN adaptors readily available so it's not much of an issue unless using stock lines.
A hydraulic shop should be able to make anything you want for a few bucks. Locally there are two places I can go too that charge about $25 plus the parts.

On the boxes I've seen you can pull out the seat insert with a screwdriver and use the Orings style lines.
I always pull them then out and and still use the AN adapter just cause....I don''t know. Just do.

[a25rjr]

My advice would be to run a 6-1 Sweet box, esp if you are planning to use a quickner with a stock box. The time and price diff is negligible.

[Lizardracing]

Hows that add up?

Sweet box $750 vs #300 for the other?

[a25rjr]

What about the fab time for the mounting bracket and steering shaft? My times always worth something. Plus, if you decide to sell, you just unbolt it and put the stocker back in.

[Lizardracing]

The last I knew brackets for the quickener were standard on chassis. Besides that if a person can't fab something up in 1/2 hour or less perhaps they need to reevaluate the choice in hobbies.

Personally too I miss the days were guys were building thier own ca rs rather than buy from a book. It's gottne much more expensive and the uniqueness has been replaced.

[stock car driver]

sweet box is a NEW racing built box... vs a oem rebuilt box with quickener.... no comparison to the performance of the two.