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I.R.S. choices

 
Old 05-15-2019, 05:26 PM
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Default I.R.S. choices

I'm trying to school myself on which I.R.S. is best for my '39 Chevy. There is SOME info on the different setups but seems to be nothing on narrowing a unit. The new Jag looks good and air bags would slip in where the coils are now but the gears seem all wrong. Ford Expedition is 67" wide and can't even find a picture to see if it can be narrowed. The new Mustang (2015 -) would be nice to but gears are a problem. I only have 7" from the back of my 8.8 now to the gas tank and would like to keep the stock tank. Also would like to use air bags in place of coils which sorta rules out 'Vettes. Anyone narrowed or installed an I.R.S. unit that can shed light on this subject. Thanks.
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Old 05-15-2019, 05:59 PM
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Have you looked at Heidt's IRS setup? I don't know which widths it is available in, but I bet a call to them will answer that.
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Old 05-15-2019, 07:13 PM
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Heidt's would be grand BUT at $10,000 plus it's not an option.
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Old 05-15-2019, 08:06 PM
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Originally Posted by 33willys View Post
Heidt's would be grand BUT at $10,000 plus it's not an option.
Understood. Just thought I would throw that in there. I also didn't know they were so proud of their stuff! Sorry about that!
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Old 05-15-2019, 11:26 PM
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Looking more for info on narrowing a unit such as an Expedition or T'Bird, etc.
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Old 05-16-2019, 08:12 AM
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Don't they narrow the Ford 8.8 IRS to put in the Miata's, don't know about bagging them tho, you could check some of the Miata build threads.
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Old 05-16-2019, 08:55 AM
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Any chance a gto rear would fit without narrowing?
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Old 05-16-2019, 12:14 PM
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Gen5 rears bound to be cheap and strong ?
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Old 05-16-2019, 12:30 PM
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GTO uses an A arm that is canted in such a way they can't be narrowed. Had one local for a good price but just would not lend itself to my application. Frustrating.

I have heard about the Miata and trying to research it a bit.

Gen 5 Camaro?
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Old 05-16-2019, 01:23 PM
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What width do you need? I'm using an E36 chassis BMW IRS in my project. The stock width I measured from outsid of the tires with stock BMW wheels is 63 1/2". Haven't measured from flange to flange as I haven't removed it from the donor yet.
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Old 05-16-2019, 01:52 PM
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Originally Posted by 33willys View Post
I'm trying to school myself on which I.R.S. is best for my '39 Chevy. There is SOME info on the different setups but seems to be nothing on narrowing a unit. The new Jag looks good and air bags would slip in where the coils are now but the gears seem all wrong. Ford Expedition is 67" wide and can't even find a picture to see if it can be narrowed. The new Mustang (2015 -) would be nice to but gears are a problem. I only have 7" from the back of my 8.8 now to the gas tank and would like to keep the stock tank. Also would like to use air bags in place of coils which sorta rules out 'Vettes. Anyone narrowed or installed an I.R.S. unit that can shed light on this subject. Thanks.
Why would that rule out the corvette IRS? They have been used in every type of vehicle including pickup trucks. Here's a link that might be helpful. I don't see why you couldn't use a shockwave air setup in place of the coil overs on these.

http://flatout-engineering.com/produ...tallation-kit/
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Old 05-16-2019, 02:33 PM
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Originally Posted by mgbgts View Post
What width do you need? I'm using an E36 chassis BMW IRS in my project. The stock width I measured from outsid of the tires with stock BMW wheels is 63 1/2". Haven't measured from flange to flange as I haven't removed it from the donor yet.
True, dozens of BMW options, or even from 4wd Audi's or VW cars. Subaru or various rwd Jap stuff.
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Old 05-16-2019, 05:23 PM
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The C4 'Vette has some odd gears with the most popular being 2.73, then 3.06. I'm sure I could replace the composite leaf with a set of air bags. Looking at the Expedition (late model) with 331 gears. Would have to narrow it and build mounting points but that is true of just about all the I.R.S. out there. The off shore stuff (minus Jag) comes with unknown gears and maybe no options for replacement gears. Not sure about how strong they would be. Can' find pictures of just about any of the systems.
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Old 05-17-2019, 10:05 AM
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What about something like this? 3.42 gearing, huge diff.... plus 7 speed manual trans...
https://www.corvetteforum.com/forums...post1599417952
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Old 05-17-2019, 12:48 PM
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The gears are right BUUUUT there are a few other problems that it would cause. First is the $3500, then the back seat issue. It would take up just about the whole back seat except for maybe a single cheeked person. Upgrade the engine from an LM4 to a gen V too...not a bad idea. LOL
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Old 05-17-2019, 01:36 PM
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You can run a Gen3/4 engine with a C5/6 torque tube and driveshaft and have a 7 speed manual
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Old 05-17-2019, 08:19 PM
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Nope, already have a headache LOL. Sprung for a late model Expedition which does not have a cradle and can't find any pictures of the naked rear end so it's feel my way thru this project. Intend to take pics and document just hope it's not a failure. I think the best way to go is build a back half on the bench then scab it into the car. Thinking of using pre-bent rails this time.
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