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Independent Rear Suspension Forum » Jaguar IRS on Airride? » 2/25/2017 9:03 am

303Radar
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Hey Kessie,
Welcome aboard. My suggestion to you would be to check out low rider websites and forums. They use Jag IRS and air bag setups all the time.
How expensive is shipping from the states? I know that QA1 shocks have progressive springs but four sets might be cost prohibitive. I'd check out Summit Racing for prices.
Also, check out Ride Tech, they might pics and kits to give you ideas.
Good luck with the project!

Independent Rear Suspension Forum » 94 XJ6 IRS Questions » 12/31/2016 8:15 am

303Radar
Replies: 3

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Forgot to mention a couple items. First is, if you want to change your wheelbase length, now would be the perfect time to do it.
Also, the u joint will be different. Not a big deal, but something else to be aware of.

Independent Rear Suspension Forum » 94 XJ6 IRS Questions » 12/30/2016 11:22 am

303Radar
Replies: 3

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I have a 98 ZR2 S10 myself. If I had the time and resources, I'd do the a similar swap myself. Only concern I would have is the wheel bolt pattern from the 94 unit. If this before the Ford acquisition of Jag.
Not that redrilling the pattern is difficult, but it is good to check.
A shop down the street from me did a similar swap with a Vette axle into a full size Chevy truck and it was very straight forward. I expect it would be easy with a jag rear and a good cross member into you S10.

Good luck and can't wait to see pics!

Independent Rear Suspension Forum » The aftermarket IRS picture thread » 11/18/2016 4:51 pm

303Radar
Replies: 93

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Welcome aboard. Feel free to wake us from our naps, especially with project pics!

Independent Rear Suspension Forum » 1988 4.2 sovereign ratio?? » 7/19/2016 10:36 pm

303Radar
Replies: 3

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If this is still a Jag rear, the ring and pinion are a Dann 44 design and they can be replaced with any ratio between 2.88 and 3.92. Anything over that and you need a different sized carrier. An experienced shop should be able to do the gear change for 300-350 plus the gears.

Independent Rear Suspension Forum » Hi, I have two IRS projects to work out. » 7/19/2016 10:30 pm

303Radar
Replies: 77

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Regarding shocks, call QA1 directly or send an email. They called me back and spent 30 minutes talking with me, even though they didn't make a sale. I did go through Summit for their shocks in the end.
Trailing arms can mount to the front or rear, whichever direction you have the most clearance. The important part is the pivot axis must be inline with the axis of the LCA. Length is of almost no consequence.
Good luck!

Independent Rear Suspension Forum » Hi, I have two IRS projects to work out. » 7/17/2016 4:42 pm

303Radar
Replies: 77

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Have you thought about using a trailing arm instead of a watts link? Much easier and might be cheaper with heim joints. Just make sure it pivots on the same axis as the lca. That's what I did and probably should have pointed out better.

Independent Rear Suspension Forum » Hi, I have two IRS projects to work out. » 6/26/2016 9:57 am

303Radar
Replies: 77

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I have to correct my prior post. I can't find the post I was trying to reference. In short, the analysis came down to the coil overs creating a torque couple which alternate their compress and release cycling. This exaggerates the twisting of the lower control arm. The lca design lends itself to twisting by accommodating the in board brakes, coming in and narrowing down to the tube and then widening again for the hub.
The way identified to prevent the twisting is to run connecting tubes which reinforce the lca and prevent the twisting. This is what I did.
If anyone can find the original post, please post a link as I can't seem to find it.

Independent Rear Suspension Forum » Hi, I have two IRS projects to work out. » 6/26/2016 8:30 am

303Radar
Replies: 77

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Do a search on this site for Boeing
I don't remember which member had his brother take an engineering look at the rear and came up with a design modification for the lower control arm. I incorporated this info and mod into my rear.
If your goal is to prevent wheel hop, I think this info will take you pretty far and much easier the the Watts setup. At least in my opinion.
Here is a link to another site with pics from my build:
http://www.348-409.com/forum/threads/ragans-59-el-camino-rebuild-project.27910/#post-245589

Independent Rear Suspension Forum » Hi, I have two IRS projects to work out. » 6/16/2016 6:26 pm

303Radar
Replies: 77

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Small and steady progress is better than no progress.

Independent Rear Suspension Forum » The Jaguar IRS picture thread » 2/27/2016 6:23 pm

303Radar
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tyrellracing wrote:

Has anyone else had a problem with shearing off the 4  7/16ths bolts that secure the rotor and companion flange to the inner stub axle? I have sheared off all the bolts on both sides now and am bumping them up to 1/2 -20 grade 8 bolts. There wasnt any drama involved. I just heard a loud snap then I only had the posi to motivate the car. After I got the car towed home I jacked the rear end up and the wheel literally flopped over. The vehicle weight held everything together. 

 
Can't say that I've had or even heard of this problem before. Glad there wasn't more damage!

Independent Rear Suspension Forum » Help! Can anyone help me identify this irs? » 2/27/2016 4:38 pm

303Radar
Replies: 10

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It's off a Jag, pretty nice setup. I don't remember when they moved out board brakes, but this is definitely inboard. Can't tell which year, but a lot of the parts are interchangeable enough that asking  for parts off a mid 70s xj12 should get you good replacement parts.
Any specific questions?

Independent Rear Suspension Forum » Hello, New Member from N. Id. » 2/27/2016 4:32 pm

303Radar
Replies: 3

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Some one may have been mistaken, they charged less than 350 with shipping. And that was 3-4 years ago.

Independent Rear Suspension Forum » Hello, New Member from N. Id. » 2/11/2016 4:11 am

303Radar
Replies: 3

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I would say check out Snow White engineering but they are out of business. Try Kuegal, not sure the spelling. They sell kits and cross members, you should be able to learn what you need from the pics. I think Speedway Motors bought Snow White and they'll have good usable pics in their online catalog.
Good luck on your build.

Independent Rear Suspension Forum » IRS in my Jensen » 2/11/2016 4:05 am

303Radar
Replies: 2

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Not that Art Morrison shouldn't be proud of their work, but their products are pricey. I'm sure their products are worth it though. I know their frames for 58-64 Chevys are 8-10 grand. Great for race projects, just not the budget.

Independent Rear Suspension Forum » HELLO FROM NELZIRS » 2/11/2016 4:00 am

303Radar
Replies: 32

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Talk about a sleeper project.
Looks like fun!

Independent Rear Suspension Forum » New member from Cartersville, GA » 1/08/2016 5:51 pm

303Radar
Replies: 3

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Welcome aboard. Can't wait to see pics.
I have a 59 El Camino I put a jag irs into. It's not at a drivable state yet as it is undergoing a frame off restoration.
Good luck with your project!

Independent Rear Suspension Forum » Jag brake kits http://jheengineering.com/ More Useless Copy and Paste » 7/29/2015 9:58 am

303Radar
Replies: 3

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Nice work. I plan on taking a closer look at the brakes later this fall. Do you have any solutions for parking brakes?

Independent Rear Suspension Forum » Ford 8.8 irs to BMW E46 axle » 7/23/2015 6:55 pm

303Radar
Replies: 1

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Welcome to the forum.
What project are you working on? Mixing BMW and Ford parts seems like some kind of a budget'ish build with on hand parts.
Can you post pics of the pieces involved?
Thanks!

Independent Rear Suspension Forum » Narrowing a XK8 IRS » 7/23/2015 6:50 pm

303Radar
Replies: 3

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Depending on how much traction you expect and type of driving you're doing, the IRS should be good for most every day driving. The only concern with the narrowing is the strength of the half shafts. But even those can be done with good strength. At worst you can get a shop which specializes in driveshafts to make shorter one which are similar to a corvette.

Independent Rear Suspension Forum » Check out this Australian Mustang with IRS » 7/23/2015 2:57 pm

303Radar
Replies: 9

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Nicely done, I like the color combo. Where did you get the finned cover?

Independent Rear Suspension Forum » Newb questions on changing gears in an XJS differential for a MGB V8 » 2/18/2015 3:17 pm

303Radar
Replies: 3

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From Wikipedia, the ranges for Dana 44 carrier sizes are:


  • Carrier sizes: 2.72:1 – 3.73:1 and 3.92 – 5.89:1

Mike from CWI had some really good information and parts.  I'm not sure what he based the info that Sedat Yalcin posted on.

Also from Wikipedia regarding the differences between Salisbury and Dana 44:
The ring gear in the Salisbury version uses slightly smaller mounting bolts and the pinion shaft is a different diameter than the common version. Naturally the cast housing is also unique to the IRS model. Standard 8.5" Dana 44 ring and pinion gear can be used in the IRS model through the use of a special installation kit which includes special shouldered bolts to mount the standard ring gear to the IRS carrier and a special pinion bearing set to fit the standard pinion shaft to the IRS housing. Gear distributors with knowledge of the Jag IRS should be able to get the installation kit. US Dana 44 gears a slightly stronger than Jaguar gears, and Jaguar gears higher priced, but once the installation kit price is added to the lower US gear prices cost is about the same. If Jaguar makes the needed gear ratio there isn't much difference in strength. The consensus in the hot rodding community is that the Jaguar IRS is good for up to 500 hp from the factory. Most V-12 Jaguar and E-type six-cylinder models used limited slip versions, other models (mainly the XJS) used a standard differential stock with limited slip as an option.

The Garage » Hello! » 2/09/2015 10:37 am

303Radar
Replies: 1

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Good luck and welcome aboard!

Independent Rear Suspension Forum » Newb questions on changing gears in an XJS differential for a MGB V8 » 1/26/2015 11:07 am

303Radar
Replies: 3

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The Jag unit is a Dana 44, 8.5 inch ring gear.  If the 3.08 setup is also for a Dana 44, you'll be in good shape.  A specialized axle shop should be able to do the swap and proper setup for about $300.
The carrier size doesn't change until you get between 3.73 and 4.11.  I don't remember the size exactly, I just know it is between the two.
Bump stops are tyically used to keep the shocks from bottoming out for a fully compressed suspension.  Shock length "should" limit the extended travel.  However, (I think) with some 'vette rears, breakage has been known to happen when power is applied and the rear suspension is fully extended while on a lift.  I think this is a rarity and has something to do with the way power is applied and the limited slip distributes power.
Research the unit Daze placed in his Mustang.  As a uni-body, some fab work was needed but overall this was pretty straight forward.

Good luck with your project!

Independent Rear Suspension Forum » irs in third gen camaro help » 1/12/2015 8:48 am

303Radar
Replies: 4

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The Jag and most Chevy rears are using a Dana 44 rear gear and pinion setup.  Some of the mid 80's vette rears are not using a Dana 44.  While I dont' know the years specifically, I'd be sure to avoid those rears.

What is the intended purpose, autocross, 1/4 mile drags?  In general, I'd avoid an IRS if you're doing high RPM neutral drops with any kind of traction.  If you're looking to do corner carving, then an IRS should be good.  I don't remember which years of Vette rears use a modified four link attached to the hub, but if you have room to work, that is what I would look at first.  However, Vette rears are more expensive than Jag rears.

Good luck and welcome aboard!

Independent Rear Suspension Forum » Jag rear end help » 12/17/2014 8:33 am

303Radar
Replies: 5

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Another resource I forgot about is Randy's Ring and Pinion.  They sell complete rebuild kits and I'm sure if you called them, you could get the part number for the stub axle seal.

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