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#230148 - 09/28/09 06:35 PM 84-87 Monte SS Steering Gear Box Option
MGD72Monte Offline
If I had $1 for every hr I spent restoring...
Silver Member

Registered: 04/27/09
Posts: 1647
Loc: GA, USA
Just looking for 84-87 Monte SS alternate steering option information for use on a 72 Monte.

Here are some questions:

- Can I modify my existing rag joint to fit (I just refurbished it) or do I need to buy a new unit? (where can I get that?)
- Are the hygraulic line hook-ups the same?
- Do you need to upgrade the power steering pump?
- How drastic is the improvement?
- How many turns lock to lock?
- What is the pitman shaft turning angle? Same as stock or do you now have a larger turning radius for the car?
- Instead of looking for an old low mileage car, can I just to to Autozone and order a reman 84-87 Monte SS steering gear and get the same benefits?

Sorry if this has already been covered in a previous thread, I could not find it.

Any info is appreciated Thanks

1972 350

... and then the angel of darkness created road salt

#230154 - 09/28/09 07:59 PM Re: 84-87 Monte SS Steering Gear Box Option [Re: MGD72Monte]
Andreas Offline
FGMCC President
Chrome Member

Registered: 10/17/00
Posts: 9362
Loc: The Birthplace of Speed, FL Me...

For some reason, I have the feeling that finding a correct, rebuilt fast-ratio Monte Box from an Autoparts store will be a gamble. But I could be wrong...

I decided to get a complete kit from and never regretted it...grin

71 Monte 454 HO 200-R4 'FULMNTE'
Andreas' Monte Carlo Site

#230181 - 09/28/09 10:49 PM Re: 84-87 Monte SS Steering Gear Box Option [Re: Andreas]
Chris Offline
Brass Member

Registered: 02/25/01
Posts: 493
Loc: New Hampshire
I run that same type box in my 71. You need a GM # 7826542 ragjoint to mate it to the column. Use your original pitman arm.

Edited by Chris (09/28/09 10:49 PM)

1971 Monte, '86 GM flame red metallic, black cloth interior, '92 350 TPI, M20 4spd, 3:36 posi, pw, pdl, power seat, power trunk, tilt, AC.
1969 El Camino Custom, silver w/blue bucket seats, console, tilt, 350 4bbl, turbo 400, a/c.
1998 BMW 540i 6spd

#230196 - 09/29/09 12:01 AM Re: 84-87 Monte SS Steering Gear Box Option [Re: Chris]
Sam (Bones) Offline
monteholic moderator
Double Diamond Member

Registered: 07/25/04
Posts: 15712
Loc: Ortonville,Mi
there are adapters to use your stock lines on that box too


#230258 - 09/29/09 03:57 AM Re: 84-87 Monte SS Steering Gear Box Option [Re: MGD72Monte]
MagicDragon42 Offline
Brass Member

Registered: 09/19/07
Posts: 328
Loc: Longmont, CO
I just completed this conversion on my 71 Monte and this is what I found and did:
1. The current power steering box will have 3.3 turns LTL and the output shaft will rotate 88.6 degrees. It is a variable ratio box that has a faster turn ratio (lower number - 12:1) at one turn from each extreme than it does when centered (higher number - 15:1) at one turn from center. It is even higher at ˝ turn about center.
2. I used a power steering gear box from an 85 Monte Carlo SS. It can be 85 to 88 but MUST be from an SS - engine code G - L69 5.0L. I bought a rebuilt one from CarQuest for about $200 plus a core charge. This box has 2.4 turns LTL and the output shaft will rotate 67.5 degrees. This means you will have a larger turning radius. It is a constant ratio box of 12.8:1.
3. You will need a new rag joint. You don't need to spend $100 plus for one from GM. I bought one from RockAuto for $40.79. Dormin #31011. It fits 76 to 86 C10 GMC or Chevy 2 wheel drive pickups. I used one bolt supplied with the new rag joint and one from my old one. This will make more sense when you see it for yourself. You need to enlarge one hole in the rag joint so the old bolt will fit.
4. Your current power steering pump has enough output pressure to work with the new steering gear but I would advise you to rebuild your old pump. Everything but the shaft bearing is easy to do. If you don't want to rebuild, you can buy a reconditioned one for about $40. Either way you need the correct tool to remove the pump pulley.
5. The biggest headache was with the fittings on the new steering gear versus the old hoses. The new steering gear has metric o-ring fittings and the old hoses are SAE flare - so is the pump. You can buy aluminum inserts from Lee Manufacturing that convert the female 0-ring on the gear to mate up with the flare fittings on the hose but then you have to finesse the SAE threads into metric threads. I found several complaints where this did not work very well and several comments where it works just fine. Weatherhead DOES NOT make both conversion fittings needed. I took a little different route; I bought a new pressure hose for a 71 Monte and I took it to a place called “Tubes N’ Hoses” and had them modify the new hose with the correct fitting on the steering gear side (metric o-ring ) and make a return hose from scratch. The new hose was $17 at RockAuto and the mod work was $26.

If I were to do it again, I would get the adapters that go from female metric 0-ring on the gear box to male AN-6 (about $8 each) and use AN-6 fittings on the entire setup.

The result was will worth the work. It drives with a much better road feel and since I never parallel park my Monte in small spaces, I don’t mind the larger turning ratio.

ChevyBuff '71 MC 402

#230459 - 09/30/09 01:46 AM Re: 84-87 Monte SS Steering Gear Box Option [Re: MagicDragon42]
MGD72Monte Offline
If I had $1 for every hr I spent restoring...
Silver Member

Registered: 04/27/09
Posts: 1647
Loc: GA, USA
Thanks for all the great advice guys. Great details for me to work with.


1972 350

... and then the angel of darkness created road salt


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