1964 300 rear seat belt anchor points ?

[SF_James]

I have seen someplace a sheet that showed the correct anchor point for 1964. I also seem to remember that they added some meat in the rear pan for this...

However, I cannot find that sheet, that was no doubt included in the box to the dealer (or owner) who wanted to add rear seat belts.

Anyone out there have a copy of that sheet or tech doc? I checked the MPB and the assembly manual and nothing I could see.

Thanks, James

 

[CBODY67]

I would suspect there might be something in a Factory Service Manual from that general area, back then. Plus in any seat belt accy package from Chrysler, too.

What you might do is to look for some little concave dimples on the inside of the floor pan, on the same plane/level, with a pair on each side of the trans tunnel. Those would be stamped in so the factory workers could drill the holes (sans templetes) on the assy line for the cars that rear belts were ordered for. The dimples should be on about the level of the rear seat cushion backside. So when the belt ends were aimed upward, the belts would lay on the rear seat cushion when everything was put back together.

Many aftermarket seat belt companies, that I have seen, ALSO sell an "anchor kit". This kit includes some larger-diamter washers which go on the outside of the floor panel, for added strength to keep the bolt head/nut from pulling through the floor pan due to the force of sudden deceleration. Maybe 1/8"+ thick and 3-4" in diameter, or similar? Of course, the nut for the seat belt bolts would probably be flange-head nuts or used flat washers to spread the load better between the seat belt nut and the anchor itself.

Just some thoughts,
CBODY67

 

[UGW]

I installed rear belts on my 63 Imperial, which isn't exactly the same, but may be similar. Like @CBODY67 says, there may be dimples on the floor pan. I could only find mine from under the car, though. There was too much sound deadening material (I think that's what it is? Kinda looks like rhino liner, but seems original to the car.) for me to see the marks from the inside. In any case, I recommend drilling from the outside of the car, so you know you're clear of brake and fuel lines. There was a dimple ahead of each rear wheel well, and two inboard near the driveshaft tunnel. A 300 may be different because Imperials have a full frame, I'm not sure. I used the big anchor washers provided by the company I bought my belts from, Seatbeltsplus.com

One source I found surprisingly helpful was bringatrailer.com Some of those auctions have so many pictures! If you can find an auction with good undercarriage shots, sometimes you can see the mounting bolts.

Here's a few pictures from when I did the job, so you know what to look for. Sorry the instruction quality isn't great. I found that image on an ebay auction; I don't have the original.

 

[aaron72]

Similar to UGW, I added rear seat belts in my 63 New Yorker, which should be pretty similar to your 300. The dimples that were visible from inside the car didn't really line up to what made logical sense for installing the anchors. Unless you can find a template, you'll need to use best judgement for location. The inside holes near the tunnel won't show much interference, but the outside ones near the doors you'll want to be very careful with as they get very close to brake lines.

 

[UGW]

Similar to UGW, I added rear seat belts in my 63 New Yorker, which should be pretty similar to your 300. The dimples that were visible from inside the car didn't really line up to what made logical sense for installing the anchors. Unless you can find a template, you'll need to use best judgement for location. The inside holes near the tunnel won't show much interference, but the outside ones near the doors you'll want to be very careful with as they get very close to brake lines.

That's why I strongly recommend at least drilling a small pilot hole from the outside of the car, going in. That way you can be sure you won't hit anything. FWIW, I had to move an inch or two away from the inside dimples on my Imperial, because the marked location interfered with the welded brace for the top half of the back seat. I'm not sure how precise Mopar was when they made those marks. As far as I could tell, there was no obvious difference in the metal if you shifted a little in any direction, but I'm also not a chassis engineer.

 

[SF_James]

Thanks all...I will just have to wing it...

James

 

[myskin]

I have seen someplace a sheet that showed the correct anchor point for 1964. I also seem to remember that they added some meat in the rear pan for this...

However, I cannot find that sheet, that was no doubt included in the box to the dealer (or owner) who wanted to add rear seat belts.

Anyone out there have a copy of that sheet or tech doc? I checked the MPB and the assembly manual and nothing I could see.

Thanks, James

This is my 300K. I’ve stripped it down to repair rust. I have reason to believe these seat belts are original, as this car has been in our family since 1966. I note that whoever installed them wasn’t too concerned about exactly where they went. Hope this helps.

 

[myskin]

Forgot to add that drivers side looks just like the passenger side, in terms of dimensions from side to side

 

[SF_James]

Thanks! James