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Old 07-17-2014, 12:37 PM
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Jag IRS in 57 Chevy Truck

Please be advised, these are not my pictures. They are from another site where a guy started this project and abandoned it for a 4 link. In looking at the pictures, it looks like he has a second series Chevy truck, I think it might actually be a 59 Apache or fleetside. I imagine that I'm going to encounter the same problems as he did and I'm completely clueless about what to do here. So I'm planning now even before I get the suspension OUT of the jaguar.

It looks like the jaguar cage fits pretty nicely right between the frame rails of the chevy, but it rides higher than it should by about 4". The original poster asked if he could trim his frame down by 3" and then box the area.

I'm just not sure what to do about those control arms that are sticking out about a foot off of the outside of the frame (shown in the 3rd picture below with the hand.)...Suggestions?
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Old 07-17-2014, 01:57 PM
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Most guys with trucks use the Jag IFS and sell the IRS to a street rod guy. Not any real advantage to the IRS other than the bragging point of having all Jag suspension. A well set up live rear axle will hook up better under the power of your big block than IRS and be a lot less headache.
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Old 07-17-2014, 09:17 PM
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The way its done is to take the IRS out of the cage. Check this out.

Independent Rear Suspension Forum / The Jaguar IRS picture thread
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Old 07-18-2014, 05:51 AM
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jag irs

My son put a jag under his 22 Dodge lakester. We used the CCR T bucket plans. The pumpkin is mounted solid to the frame and we made new rear hairpins. there is lots of info on the Hamb Forum about Jag suspensions, front and rear, also quite a bit here on hotrodders. For a quieter ride most recomend making a new crosmember and using rubber-poly mounts. the lower foreward arms can be replaced with custom arms with the front pivot locations in line with the the inner LCA centerlines. We have 4 Jag susp. on pallets for someday projects. We cut up the stock cage to use for drill patterns.
google and you will get lots of infor here's one
http://www.stovebolt.com/ubbthreads/...&Number=573339

Last edited by timothale; 07-18-2014 at 05:56 AM.
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Old 07-18-2014, 12:58 PM
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I know that snowwhite sells a crossmember and some other pre-fabricated parts to remove the suspension from the cage. I thought that keeping it in cage might actually make everything go in easier (albeit uglier).

Also Bubba, I'm aware of the pros and cons (at least some of them) with IRS vs. 4 link or other setups...I bought this jag for $800 and figured that I'd just use the front and rear suspension on the truck. It might not stand up to the BBC very well but I'm going to give it a shot and maybe I'll look at swapping it in the future.
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Old 07-18-2014, 08:46 PM
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jag strength.

The jag irs uses basically a Dana 44. some parts fit-or can be modified to work. the Stock jag crosmember can probably be modified to fit most pickups. We save the steering colum pieces-the funny U joint, brake pedals-M cyl. E brake handle-cables.
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Old 07-21-2014, 07:39 PM
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I've been corresponding with a gentleman who has a 48 Chevy who has the Jaguar IRS in it. From my understanding he soft mounted it, as he did the front...which is what I'm shooting for here.

I want to minimize welding / fabrication on this job mainly because I don't have the skills or the tools and I want to forego the cost of paying someone to do this for me...besides the inconvenience of trying to get all of this stuff to another location to have someone else do it...

This evening I got the front suspension dropped. I think I have a pretty good idea of how that's going to fit up on the 57. How the rear is going to work out, I still am clueless...outside of "uncaging it".
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Old 07-22-2014, 07:03 AM
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Jag mounting

You could probably trim off the ends of the Jag rear crosmember cut out the rivets on the stock truck crosmember then slide the Jag inside the stock frame rails. that would lower you about the 3 or 4 in you want, replace the stock rear crosmember, bolt it in. Make 4 iron brackets , drill and bolt the Jag crosmember to your frame rails. setting your pinion angle .. The factory lower foreward control arms are to limit the stock rubber mounted crosmember from moving. If you solid mount the crosmember there won't be that much movememt. On the T bucket plans we take the arm apart , remove the rubber bushings and trim off the arm, leaving the piece of round tube. We welded a new bracket to the round tube for the new hairpins mounting, then reinstall the rubber bushings You could use a new lower strut angled to meet new brackets on your frame . all the bracketry could be fabbed somewhere from patterns you make. We use 7/8 dom tubing for the struts, heim or clevis ends,
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Old 07-22-2014, 07:10 AM
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Irs VS 4 link.

An old friend is the retired head of Ford Racing, He still races his 427 cobra, the first 427 sold to a retail customer. With the IRS he beat all the newer trick 4 bar-3 link , truck arm, etc suspension cars at the 2009 optima , He won first in autocross, first in the road race course , first in the run flat out then stop,
https://www.youtube.com/watch?v=KT3aZzGpG84

Last edited by timothale; 07-22-2014 at 07:33 AM.
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Old 07-22-2014, 08:01 AM
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Quote:
Originally Posted by timothale View Post
An old friend is the retired head of Ford Racing, He still races his 427 cobra, the first 427 sold to a retail customer. With the IRS he beat all the newer trick 4 bar-3 link , truck arm, etc suspension cars at the 2009 optima , He won first in autocross, first in the road race course , first in the run flat out then stop,
https://www.youtube.com/watch?v=KT3aZzGpG84
didn't big red.. a 1st gen f body.. take the win..

the irs under that cobra more than likely is a mustang set up..
or the FFR set up..
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Old 07-22-2014, 08:34 AM
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optima 2009

I Haven't seen Bruce for a while and don't know what changes he made to the rear end. At the end of the event they anounced that a camero had won. but later re-totaled the points and Bruce won with 3 first places and one second. then they said he couldn't bring the cobra back. so the next year he brought his Ford Gt and came in 3 rd , with a broken sway bar link and no set up for the track.
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Old 07-22-2014, 09:01 AM
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Cobra # 3170

Bruce posted on the Club Cobra forum
I am running an aluminum Salisbury very similar to the Jag unit with 30 spline
stub shafts and 3:31 gears, stock half shafts with drag race U-joints.

Last edited by timothale; 07-22-2014 at 09:10 AM.
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Old 07-22-2014, 04:56 PM
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Jag IRS

IF at all possible,leave it in the cage,its a BI--H to work on with it out of the cage,ive done it both ways,never again out of the cage...
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