70 Rear Quarter Trim Screw 3923905

[Bill L.]

There is a picture in the new JG but I cannot quite make it out on page 38.

Does someone have a picture of the actual screw? It appears to have a washer built in but I just cannot quite make it out.

The screw is also noted in the AIM page UPC1 F16.

Thanks,


Bill

[Ron G.]

[Bill L.]

Re: 70 Rear Quarter Trim Screw 3923905

Hi Ron,

It is the screw that attaches the rear quarter trim by the shoulder harness belt. The top screw.

Alan was kind enough to post a picture of what was on his 71 a number of years ago. The picture shows a collar and a screw. The AIM only calls out a single part number so now I am wondering. I would think the collar would be called out separately.

Thanks,


Bill

[Joe L.]

Re: 70 Rear Quarter Trim Screw 3923905

Hi Ron,

It is the screw that attaches the rear quarter trim by the shoulder harness belt. The top screw.

Alan was kind enough to post a picture of what was on his 71 a number of years ago. The picture shows a collar and a screw. The AIM only calls out a single part number so now I am wondering. I would think the collar would be called out separately.

Thanks,


Bill

Bill------


GM #3923905 is a self tapping screw of 8-18 thread size and 0.75" length. It is phillips oval head and tapered ("countersunk"). It has an integral "washer" which is tapered and conforms to the tapered head. The screw head is 0.28-0.30" in diameter and the washer does not increase this diameter. It has a chrome finish. It was never available in SERVICE from GM.

[Jimmy P.]

Re: 70 Rear Quarter Trim Screw 3923905

There is a picture in the new JG but I cannot quite make it out on page 38.

Does someone have a picture of the actual screw? It appears to have a washer built in but I just cannot quite make it out.

The screw is also noted in the AIM page UPC1 F16.

Thanks,


Bill

Here is a close up of the screw.

[Joe L.]

Re: 70 Rear Quarter Trim Screw 3923905

Here is a close up of the screw.

Jimmy------


That's not a GM #3923905. That's a GM #3922441 screw with a GM #140270 washer.

[Jimmy P.]

Re: 70 Rear Quarter Trim Screw 3923905

Jimmy------


That's not a GM #3923905. That's a GM #3922441 screw with a GM #140270 washer.

Thanks Joe, the screw I attached above was used on early 73's. It looks so similar to the one Bill asked about pictured in the 70-72 JG. I thought it was the same. As a matter of fact we were discussing this screw on the 73-74 revision team. We found that it changed again later on in the 73 run. Here is a photo of the screw and flat washer used on an April 73 coupe.

[Bill L.]

Re: 70 Rear Quarter Trim Screw 3923905

Thanks Joe, the screw I attached above was used on early 73's. It looks so similar to the one Bill asked about pictured in the 70-72 JG. I thought it was the same. As a matter of fact we were discussing this screw on the 73-74 revision team. We found that it changed again later on in the 73 run. Here is a photo of the screw and flat washer used on an April 73 coupe.

Actually that is the screw in the JG.

The screw I meant to ask for is 9427868. I looked at the wrong item in my AIM(12 versus 13). The AIM calls out screw 9427868 for the top screw in the rear quarter trim. This is the same screw(s) that is used to attach the lower dash pad to the door jambs. This screw is a phillips with a flat washer that cannot be removed from the screw.

That is not what is shown in the JG from what I can see. Again I cannot make it out with certainty.

Given Jimmy's picture and the one provide to me by Alan a number of years ago on his 71 the last part numbers from Joe seems correct. These are the same screws and collar used on the door panels as pictured by Jimmy and the JG as best I can make out.

Now we know the AIM is not always the way they were assembled in production. Maybe we need a couple original 70 owners to chime in. Either screw is pretty easy to find. Just need to know what is correct as assembled by the factory.

Thanks,

Bill

[Gary B.]

Re: 70 Rear Quarter Trim Screw 3923905

Bill,

You have never really said coupe or convertible. But, based on another post on this forum, I'll ASSUME it's a convertible. Good assumption?

1970 that I have here, vin 5774, uses the screws Joe describes on both the upper and lower portions of the quarter trim panel.

The coupes use a similar screw with a finishing washer at the very top of panel, near the T-Top. Figure I 14.1 in the TIM&JG. Picture below. It's from a 72 Coupe, s/n 26,447. Almost the end of production. Hope this helps?

[Bill L.]

Re: 70 Rear Quarter Trim Screw 3923905

Bill,

You have never really said coupe or convertible. But, based on another post on this forum, I'll ASSUME it's a convertible. Good assumption?

1970 that I have here, vin 5774, uses the screws Joe describes on both the upper and lower portions of the quarter trim panel.

The coupes use a similar screw with a finishing washer at the very top of panel, near the T-Top. Figure I 14.1 in the TIM&JG. Picture below. It's from a 72 Coupe, s/n 26,447. Almost the end of production. Hope this helps?

HI Gary,

Thank you. Yes it is a Convertible.

The AIM shows different part numbers for lower and upper which is the reason for the question. The AIM is not clear on Convertible verses Coupe either. I have the screw you show both top and bottom yet the AIM calls out the same screw used on the lower dash pad to door jamb.

I am going with what you have as I see no evidence on the trim that there was ever a screw with a washer. I am thinking the washer or collar would leave some type of mark.

Kind Regards,


Bill

[Russ S.]

Re: 70 Rear Quarter Trim Screw 3923905

For what it's worth early 73 used the screw and upholstery washer that Gary's pic shows.

[Gary B.]

Re: 70 Rear Quarter Trim Screw 3923905

Bill,
The reason for different part numbers between the upper and lower, is the lower screw is longer. Longer screw, different number.
Gary B

[Bill L.]

Re: 70 Rear Quarter Trim Screw 3923905

Bill,
The reason for different part numbers between the upper and lower, is the lower screw is longer. Longer screw, different number.
Gary B

The part number for the upper screw matches the part number for the screws that hold the lower dash panels to the door jamb in m y 70 AIM.

Bill