73-78 doors directly interchangeable with 79-91 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**hatzie** · 09-08-2009, 05:20 AM

I've read. The door width at the style line of the 73-78 OEM GM doors is 42". This individual also stated that all Aftermarket doors and the OEM 79-91 doors are 1/4" narrower measuring in at 43 3/4".

Is this accurate or BS?

- David H

Number21 · 09-08-2009, 06:08 AM

The only difference I've heard about with the earlier doors is that they don't have provisions for power stuff.

**N2TRUX** · 09-08-2009, 08:32 AM

Externally the doors are all the same. Internally the doors run 73-76 then 77-91. They will all fit, the early dors don't have provision for power windows. The door panel area is different too.

TheSunDanceKid · 09-09-2009, 03:03 AM

you guys ever seen the conversion kits they have to change manual windows into autos with out changing regulators and what not ive installed a few sets a while ago there pretty nifty
http://www.slickcar.com/productdetai...ProductID=3277

bigblock73 · 09-09-2009, 08:46 AM

This is the second time I have heard the 1/4" difference thing...We should have some of the 73-76 guys measure their doors to see if this is true (my doors are 77+...I can measure those).

But long story short, the doors are interchangable as far as bolting them on...just remember the guts and panels changed a little.

ElGracho · 09-09-2009, 08:51 AM

Quote:

Originally Posted by bigblock73

...We should have some of the 73-76 guys measure their doors to see if this is true...

I'll measure the ones on the 75 tonight. I just got a set of 74 doors last weekend too. I'll measure those to start some sort of average.

Are we measuring the style line right under the door handle?

bigblock73 · 09-09-2009, 12:57 PM

Quote:

Originally Posted by ElGracho

Are we measuring the style line right under the door handle?

I would think that would be easiest and most accurate.

xbanone · 09-09-2009, 06:24 PM

41 3/4" on my '76 doors I am pretty sure they are OEM. I also have a few other sets I will check in the 78+ range. I plan to replace the doors on my truck with a set from an '86 Blazer.

Restrorob · 09-09-2009, 10:28 PM

Quote:

Originally Posted by xbanone

41 3/4" on my '76 doors I am pretty sure they are OEM.

I got 41 3/4" on my 74 aftermarket doors, Trashed the originals years ago....

davehatz · 09-11-2009, 06:26 AM

Quote:

Originally Posted by Restrorob

I got 41 3/4" on my 74 aftermarket doors, Trashed the originals years ago....

My rusty 76 OEM door is 41 3/4" as well. My guess is that the measurements on the 78+ doors will be the same as all the others.

Thanks

09-08-2009, 05:20 AM	#1
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	73-78 doors directly interchangeable with 79-91 I've read. The door width at the style line of the 73-78 OEM GM doors is 42". This individual also stated that all Aftermarket doors and the OEM 79-91 doors are 1/4" narrower measuring in at 43 3/4". Is this accurate or BS? - David H

09-08-2009, 06:08 AM	#2
Number21 Registered User Join Date: Aug 2009 Location: Oregon Posts: 611	Re: 73-78 doors directly interchangeable with 79-91 The only difference I've heard about with the earlier doors is that they don't have provisions for power stuff.

09-08-2009, 08:32 AM	#3
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: 73-78 doors directly interchangeable with 79-91 Externally the doors are all the same. Internally the doors run 73-76 then 77-91. They will all fit, the early dors don't have provision for power windows. The door panel area is different too. __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

09-09-2009, 03:03 AM	#4
TheSunDanceKid Registered User Join Date: Aug 2009 Location: chandler, arizona Posts: 125	Re: 73-78 doors directly interchangeable with 79-91 you guys ever seen the conversion kits they have to change manual windows into autos with out changing regulators and what not ive installed a few sets a while ago there pretty nifty http://www.slickcar.com/productdetai...ProductID=3277

09-09-2009, 08:46 AM	#5
bigblock73 yeller Join Date: Oct 2001 Location: Twin Cities Posts: 13,824	Re: 73-78 doors directly interchangeable with 79-91 This is the second time I have heard the 1/4" difference thing...We should have some of the 73-76 guys measure their doors to see if this is true (my doors are 77+...I can measure those). But long story short, the doors are interchangable as far as bolting them on...just remember the guts and panels changed a little. __________________ Jeff 73-87.com 73-87.com Facebook page 73-87 cab corner 6x9 speaker brackets for sale 67-72 cab corner speaker brackets for sale 47-54 cab corner speaker brackets for sale

09-09-2009, 06:24 PM	#8
xbanone Registered User Join Date: Oct 2008 Location: WV Posts: 209	Re: 73-78 doors directly interchangeable with 79-91 41 3/4" on my '76 doors I am pretty sure they are OEM. I also have a few other sets I will check in the 78+ range. I plan to replace the doors on my truck with a set from an '86 Blazer. __________________ 1976 K15 Short/Step 1981 C10 short/wide 1994 K1500 ECSB Last edited by xbanone; 09-09-2009 at 06:26 PM.

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