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Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges.

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Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Empty Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges.

Post by zucchi Mon Jul 11, 2022 8:47 am

The link that keeps the spring in place on the hinge strap broke off one of my hinges…

Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2019
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2020

Found a pair of NOS A-body hinges, part number 9877650.
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2021
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2022

They were nowhere near as long as what's in the car. It turns out that Monte Carlo is special; P/N is 9877659. Wouldn't you know it.

If anyone has NOS 9877659 trunk lid hinges, I would like to offer a straight trade; you send me yours, I'll send you mine. Otherwise, my other option is to cut the links from the new hinges I have and install them into my old hinges with 1/4" clevis pins. I would then need to scrap the hinge straps since they're of no use to me.
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Post by g3chevy / Mr Pontiac Thu Jul 21, 2022 4:53 pm

Never knew there was a difference, good info. Also looks like the rest of us should lube the pivot points on these hinges before we end up in the same situation.
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Post by zucchi Thu Jul 21, 2022 5:15 pm

Me neither until I compared the new ones to the ones in the car… then checked my parts manual. These hinges are used in all A bodies except Monte Carlo. Should've checked the parts manual first; hind-sight is always 20/20.

Either way, still needed that pivoting spring mounting thingy (don't know what it's supposed to be called) so, since I got no response, I'll be doing surgery this weekend. AND, I'll be liberally greasing all pivoting metal-to-metal surfaces. In fact, I'll be including this in my regular chassis lubing regime.
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Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Empty The deed is done; hinges no longer available.

Post by zucchi Mon Jul 25, 2022 8:53 am

Took the hinge out and compared to the new one…
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2023

The hinge strap is a completely different size but the spring-mount-pivot-thingy (SMPT) is practically the same so the new hinge strap assembly will serve as a donor for the SMPT.
Time for surgery.
Ground off the peened over end of the respective SMPT pins and removed them…
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2024

Used a new ΒΌ" stainless steel clevis pin to reassemble and liberally greased the assembly…
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2025


Technical note: The diameter of the hinge strap-to-body pin for the regular A body hinge is 5/16". For the Monte Carlo, the diameter is 11/32"; Really? Are you kidding me?! [SIGH] Shouldn't be too surprised; it is a Monte Carlo after all.
I couldn't find any clevis pins in that diameter so I had to take a ⅜" dia. pin and machine it down to size; an annoying inconvenience.

Now, with everything buttoned up and lubricated, the trunk lid functions perfectly.
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Post by g3chevy / Mr Pontiac Tue Jul 26, 2022 5:48 pm

Cool, sounds like you are going to make everything work. I'm wondering if using door hinge pin bushings would help as a long term fix?
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Post by zucchi Tue Jul 26, 2022 6:05 pm

This failure occurred after nearly 50 years and more than 500k miles of average trunk use, and never lubricating the pivot pins and strap pins.

The trunk lid is the lightest "door" on the entire car. Keeping these pins lubricated moving forward should last until I die, at least. Just like keeping the hood hinge pins lubricated along with, of course, side door hinge pins so as to extend their service life.
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Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Empty Anyone have a pair of used Monte Carlo hinges?

Post by zucchi Tue May 21, 2024 5:55 pm

I found a pair of used trunk hinge assemblies, cut out of a donor car and shipped for $175.00 – reminder: Monte Carlo trunk hinge assemblies are unique to Monte Carlos.
Before I close the deal, can anyone here beat it?
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Post by g3chevy / Mr Pontiac Tue May 21, 2024 7:59 pm

zucchi wrote:I found a pair of used trunk hinge assemblies, cut out of a donor car and shipped for $175.00 – reminder: Monte Carlo trunk hinge assemblies are unique to Monte Carlos.
Before I close the deal, can anyone here beat it?

I just acquired a 75 Monte today and a 76 a few weeks back. I'm sure one set has to be good. Can you post a pic of exactly what you need included to make it work? Torsion bars, etc?
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Post by zucchi Wed May 22, 2024 10:50 am

g3chevy / Mr Pontiac wrote:Can you post a pic of exactly what you need included to make it work? Torsion bars, etc?
Here you go:
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. S-l16012
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. S-l16011
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. S-l16013

The assembly is the strap (looks like a hook) with a piece inside it that pivots and the box that holds it all together. The boxed assembly is spot welded to the rear deck and the wheel well. The pins on which all the parts pivot are peened or swaged on the ends. The parts I really need are the strap and the pivoting piece that's inside it:
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img_2022

There are two ways to get them out:
  1. Cut the box from the car with the strap assembly attached.
  2. Grind off the peened end of the pin that the strap pivots on, remove the pin then remove the strap assembly from the box.

I don't know which method would be less of a PITA.
The price we pay for decisions engineers made 50+ years ago.

By the way, you mentioned the torsion bars; I hadn't considered them. As cruel as the cosmos can be, if I pass up on those bars, I'll need them at a time when they're no longer available, so, if you're offering them too…
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Post by g3chevy / Mr Pontiac Wed May 22, 2024 3:34 pm

Here's what I've got. When pushing them through their full travel I don't feel a lot of play. I'm thinking the best way to check is to remove the torsion bars an check them without tension to be sure. It might be a week or 2 before I can get to them. So it won't hurt my feelings if you go the other route. Shipping the torsion bars (springs) would increase the shipping quite a bit due to their length.

Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img20212
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img20213
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img20211
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img20215
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. Img20214
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Post by zucchi Wed May 22, 2024 7:09 pm

The photos look good.
g3chevy / Mr Pontiac wrote:It might be a week or 2 before I can get to them.
These are not mission critical so there's no time crunch; anytime before the end of this summer??
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Post by g3chevy / Mr Pontiac Wed May 22, 2024 10:26 pm

For sure in the next week or so Zucchi. I'll be able to take the torsion bars off and check for play and let you know the status.
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Post by g3chevy / Mr Pontiac Sun Jun 16, 2024 8:39 pm

Zucchi, had a chance over the weekend to remove the trunk hinges. They seem to be in very good shape with very little play.

Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. 75_mon10
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Post by zucchi Yesterday at 11:08 am

WOW! Shocked
The complete assemblies. I shudder to think about how much of a PITA it was to do that.
I'm still interested in them.
Please follow up via PM.
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Post by g3chevy / Mr Pontiac Yesterday at 11:43 am

zucchi wrote:WOW! Shocked
The complete assemblies. I shudder to think about how much of a PITA it was to do that.
I'm still interested in them.
Please follow up via PM.

Yes, it was a little bit of work. But they are ready to weld in with no holes drilled through the mounting flanges in case you have a spot welder. PM sent.

Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. 75_mon12
Trade NOS A-body trunk lid hinges for 1974 Monte Carlo trunk lid hinges. 75_mon11

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