Rear Sub-Frame Bolts - TCCoA Forums
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post #1 of 8 (permalink) Old 09-29-2017, 10:07 AM Thread Starter
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Rear Sub-Frame Bolts

To all those who have removed or attempted to remove the 4 rear sub-frame bolts recently- how did it go?

I am hoping to do a complete rear suspension overhaul on my Thunderbird in the near future, and I keep seeing mentions of people breaking the bolts or rounding the heads off.

I was thinking about drilling four 1/8" holes in the car that would allow me to spray the internal nut with PB Blaster for a few months prior to removal.

Any experience shared would be appreciated.

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post #2 of 8 (permalink) Old 09-29-2017, 02:14 PM
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I have removed plenty of these from junkyard cars without issue. It will make a huge difference if the car was exposed to salt. I use a 6pt socket and a long (25") breaker bar. If you break or damage them, I'm sure I can get a set.

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post #3 of 8 (permalink) Old 09-29-2017, 05:24 PM
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The common problem is them seizing, and you have to cut windows in the sheet metal to access the nuts.

There are/were pix for that, and a few threads, somewhere.

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post #4 of 8 (permalink) Old 09-29-2017, 05:31 PM
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I made an attempt during my build, I got ONE to budge, driver side rear. The other three I snapped sockets on and didn't dare go further. Awful awful engineering.

-Matt
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post #5 of 8 (permalink) Old 09-29-2017, 07:00 PM
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The problem, especially in the northern states, is not so much the nut rusting to the bolt, but the bolt rusting to the sleeve of the bushing. When you go to loosen it, the bolt can't even turn enough to spin out of the nut. If they don't budge on you, then get another set from someone down south, and just cut the heads off the bolts, and once the subframe is out, you can grab the bolts with a vice-grips and spin them right out.
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post #6 of 8 (permalink) Old 09-29-2017, 07:55 PM Thread Starter
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Last month I pulled the rear sub frame while disassembling my dune car project. I was only wanting the diff and LCAs, but because of the reverse knuckle bolt that always gets in the way on Lincolns, I decided to try just pulling the 4 frame bolts. Because I was not going to reassemble, I did not care if they broke. I ended up breaking all 4 bolts after an 1/8 turn with a long breaker bar. They all snapped right at the head. After what MadMickey said, I realized that all my bolts were seized in the sleeves.

1995 T-Bird.
PI 4.6. Bullitt intake. Stage 2 MHS cams. Kooks Headers. 4,200 ATF Speed converter. BCA Transmission. 4:10s. Tune by Supercoupes Unlimited. 245 RWHP.
3,700 lbs at half tank. Goal- 3,400 lbs
Best of 13.85 at 96 mph. Goal- 11's NA

1997 Lincoln Mark VIII LSC- stock

1997 Lincoln Mark VIII FX2 Sand Dune Machine- R.I.P.
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post #7 of 8 (permalink) Old 09-30-2017, 01:48 PM
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Quote:
Originally Posted by MadMikeyL View Post
The problem, especially in the northern states, is not so much the nut rusting to the bolt, but the bolt rusting to the sleeve of the bushing. When you go to loosen it, the bolt can't even turn enough to spin out of the nut. If they don't budge on you, then get another set from someone down south, and just cut the heads off the bolts, and once the subframe is out, you can grab the bolts with a vice-grips and spin them right out.
Do the sleeves stay in place in this instance (being pulled out of the rubber) when the subframe is dropped or do they break free from the remainder of the bolts with the weight of the IRS? I imagine if the bolts are siezed to the sleeves, and effectively the IRS itself, some prying is in order.

-Matt
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post #8 of 8 (permalink) Old 09-30-2017, 02:25 PM
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Yes, some prying is needed to break everything free, but it will come out. I honestly don't remember whether the sleeves came off the bolts or out of the bushings though.

-91 Cougar LS, coming soon, complete overhaul with a 427" Windsor.
-90 XR7 5-speed black on black w/sunroof, MP2, coated rotors, double intercooler, 15%OD, ported heads, comp stage 1 cam, 85mm TB, 90MM LMAF, 80# injectors, and ported big valve heads
-98 Mark VIII LSC, Procharger P600b, TR3650 swap and 3.73s.
-90 SC Automatic rustbucket winter beater
-97 Tbird Sport 4.6 Nice weather daily driver
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