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Old 12-20-2005, 11:50 PM
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Irs

I am thinking about using an IRS in my '48 Fleetline. Has anyone tried this setup? What is the best unit to use. I am going to replace the tired old 216 with a 250 backed up with a
TH350. Is the TH350 equipped with OD.

Al

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Last edited by Gr8 '48 bow tie; 12-21-2005 at 11:14 PM.
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Old 12-23-2005, 01:43 AM
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What is this???? No help??

Al
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Old 12-23-2005, 03:03 AM
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Sorry cuz, I've never put a tape over a 46 - 48 Chev sedan but as the 53 - 62 'vettes share many front end components with early 50's sedans I guess the track must be similar.
How about converting the front end to ball joint with 65 up vette spindles and a 65 up rear end, gives you matching brakes and stud pattern. You'ld have to build a 'cage' of course. Both cars are rear steer so with minor changes for ackerman with the longer wheelbase it could be a runner.
A 250 with a t2004r (4 spd od) would work and if you're really bored how about a home made intake and efi from a 300 Ford.
Ho Ho from way down south.
Ian.
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Old 12-23-2005, 03:06 AM
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I only used 65 up vettes as an example because whilst 63/64 share the suspension, they are DRUM BRAKE.
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Old 12-24-2005, 08:43 AM
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Quote:
Originally Posted by Gr8 '48 bow tie
I am thinking about using an IRS in my '48 Fleetline. Has anyone tried this setup? What is the best unit to use. I am going to replace the tired old 216 with a 250 backed up with a
TH350. Is the TH350 equipped with OD.

Al
no, the th350 does not have overdrive, but the 700r4 does
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Old 12-24-2005, 10:37 AM
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I have found that T-bird/Cougar IRS systems from early nineties cars adapt very easily to older frames. Usually a bolt in with a few hand made brackets..
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Old 12-25-2005, 04:14 AM
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Thanks for the info. I will look for a 700R4 to replace the TH350 that I now have. Before I start my search, I need to know if the 700R4 will bolt up to the six cylinder engine or do I need an adapter.

Al
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Old 12-26-2005, 11:38 AM
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700r4

Chevy bell bolt pattern is standard for 350 400 or 700r4.If you get one from a late 80's Chevy the valve body can be set up to lock the converter.The after market valve that holds lock up through 3/4 throttle is worth the money and easy to install.I use a 2200 stall converter because my truck is 6000 lbs.Expert transmission built mine and they use hardened parts and run an extra clutch in 3/4 clutch pack.Do some research and ask questions before having your 700r4 rebuilt.The links you need to research this are in this category just a couple of pages back.
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Old 12-26-2005, 03:21 PM
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The 89-97 MN12 series Birds/Cougars, and 93-97 Mark Vllls have nice IRS in them. The standard V6 use a 7.5 rear, but the V8s and Super Coups use a 8.8 in them. Stock ratios are vetween 2.73 and 3.27 depending on engine and trans. Most of the guys building the Cobra Replica cars are using them, so they do very good. They have a sub frame for the rear, and the complete thing uses 4 mounting points.

Here is a shot of the rear of mine in my 93 Bird.



Many more pictures from differant angles here
http://members.tccoa.com/392bird/

Here is a good page showing the complete IRS and subframe
http://www.mn12performance.com/mn12how-to/irs/irs.html

Last edited by 93GMCv6; 12-26-2005 at 04:50 PM.
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