Is and IROC box the same as base Camaro? - Team Camaro Tech
Brakes, Suspension & Steering Conversion questions, Steering & Handling

 
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post #1 of 14 (permalink) Old Dec 4th, 01, 04:04 AM Thread Starter
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I wnat to install a quick ratio steering box and read somewhere that the 3rd gen IROC box is the one I need. I han't been able to locate an IROC but I am giong tonight to pull the booster from an 85 Berlinetta. Did all the 3rd gen Camaros and Firebirda share the same ratio box or is the IROC box a different ratio?

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post #2 of 14 (permalink) Old Dec 4th, 01, 04:23 AM
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Bret
 
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There are two different boxes. I have an article at home that states that you want the IROC box or one from a TA with the perf susp package 16" wheels etc. I'm pretty sure the ink stamp on the end cap is "YA" but that is usually worn off or difficult to read. I can look up the article or you can try a search for third gen fast ratio boxes, there is a lot of info here on the swap.

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Bret Copsey
'68 Camaro base coupe
'92 Caprice wagon
'98 Malibu
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post #3 of 14 (permalink) Old Dec 4th, 01, 06:54 AM
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David Pozzi
 
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Iroc is fast and stiff, Z/28 is fast and very slightly softer, all other models are slower as far as I know. I don't know if fast ratio was an option for base models.
I have more steering info from mag articles on my page below.
David

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post #4 of 14 (permalink) Old Dec 5th, 01, 04:13 AM
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Bret
 
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This is some info from an article in the March 2000 issue of Car Craft-I think it's worth pointing out that it states the 67 has a travel radius than 68/69:

---A-----B----C--D-------E------F------------
7843512 1331 HX 32* 32lb-in 84-92 F-car
....................................perf susp
...................................16" wheels
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
7843135 1282 YA 39*15' 30lb-in 84-87 G-car
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
26041012 1544 FB 39*15' 22lb-in 92-94 Police
......................................Caprice
.................................94 Impala SS
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
26048653 --- MX 39*15' 22lb-in 95-96 Police
......................................Caprice
..................................& Impala SS

A=GM part number
B=Hollander Exchange number
C=ID code (ink stamp)
D=Travel
E=Steering Valve Tansion
F=Original application

The first listing is best for use on 68-69 and the other three are for 67 models. The article also lists some info for 2nd gens and the list of boxes for 67's is also good for 64-72 A body's. If you go directly to Chevy, GM part number 7843135 is currently serviced by PN 7839897 which has more restrictive stops than the original assembly. Hope this is helpful for someone.


Sorry about the way this looks, couldn't get the chart to come out right??
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Bret Copsey
'68 Camaro base coupe
'92 Caprice wagon
'98 Malibu

[This message has been edited by bretcopsey (edited 12-05-2001).]

[This message has been edited by bretcopsey (edited 12-05-2001).]

[This message has been edited by bretcopsey (edited 12-05-2001).]

[This message has been edited by bretcopsey (edited 12-05-2001).]

[This message has been edited by bretcopsey (edited 12-05-2001).]

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post #5 of 14 (permalink) Old Dec 5th, 01, 04:24 AM Thread Starter
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Well I guess I am looking for the HX box then. It is going in my nova, so I assume the same rules apply as for the 68-69 Camaro. Now, will the stops in the new box be more restrictive then my original box? If I use the cap from my box on the new one will that take care of that, or would I be best to leave ot alone since I will be going to wider tires eventually? I found a guy parting an 88 Trans Am GTA, and he wants $100 for the box, but I am waiting for a call back from another guy that thinks he has an IROC box. I assume they would be the same so I figure I will get whichever I can get a better deal on.
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post #6 of 14 (permalink) Old Dec 5th, 01, 04:34 AM
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There is a tech article on this site about rebuilding a power steering box using an original housing and end cap and installing the late model guts.
http://members.home.net/jimmy4/gearpg1.htm

I think that that the late model box will be fine with it's stops with wider front tires. The last time I had this thing on the road with 15X8 235/60/15 (don't remember the backspacing) the tires rubbed the frame at full lock and I'm going a little wider the next time around.

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'92 Caprice wagon
'98 Malibu
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post #7 of 14 (permalink) Old Dec 5th, 01, 04:41 AM Thread Starter
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Thats exactly what I had in mind. Since I allready have power steering, I wont have to worry about trying to adapt the fittings, just the rag joint. Should be easy enough to do. Im pretty good with hydraulics.

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post #8 of 14 (permalink) Old Dec 5th, 01, 05:03 AM
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I also should mention that another article mentions modifying the pump to support the new fast ratio box.

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'68 Camaro base coupe
'92 Caprice wagon
'98 Malibu
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post #9 of 14 (permalink) Old Dec 5th, 01, 05:09 AM Thread Starter
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Whats involved there? What happens if you dont modiffy the pump. Is it higher effot or what?

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post #10 of 14 (permalink) Old Dec 5th, 01, 05:18 AM
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Bret
 
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Not certain, probably higher effort though. I'm pretty sure all that was involved was removing a shim and /or chaging the spring and drilling out the pressure port oriface (don't know if that's the right term).

I just pulled the pump and box together from my donor car so that I wouldn't have to mess with it.

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'92 Caprice wagon
'98 Malibu
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post #11 of 14 (permalink) Old Dec 5th, 01, 05:42 AM Thread Starter
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Well the IROC pump wont bolt to my big block unless I can install the pump into my old tank. Do you know where to find out exactly what I need to d? Did you see that in a magazine or on a website somewhere?

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post #12 of 14 (permalink) Old Dec 5th, 01, 06:56 AM
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I don't know whether the pump reservoir will transfer or not-haven't gotten that far myself. The article I referenced the above info from also had the pump info, I thought it was a different one. If you've got a fax number I can send it over to you. Send me the fax number via e-mail and I can get the entire article to you. I could scan it and e-mail it but it will be a few days before I could get to it.

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Bret Copsey
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'92 Caprice wagon
'98 Malibu
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post #13 of 14 (permalink) Old Dec 5th, 01, 09:40 AM Thread Starter
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Thanks Bret!!! That article is great. It even tells you what size drill bit to use to step up the pump pressure and everyhting. Answered all my questions and more.

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post #14 of 14 (permalink) Old Dec 5th, 01, 10:03 AM
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No problem, glad to help!

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'92 Caprice wagon
'98 Malibu
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