1964 GMC 1000 axle flip kit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Artie Sellars · 02-26-2025, 07:25 PM

I’ve been lurking around here forever and I can usually find what I need just by researching this site. However, I can’t seem to find anything about this. Does anyone have a source for an axle flip kit for a 1964 GMC? Plenty of stuff for Chevrolets but nothing for the GMC’s with leaf spring rear ends.

karlbenz · 02-26-2025, 09:25 PM

good luck. Not a lot out there for GMC specific stuff

**cwcarpenter98** · 03-02-2025, 11:10 AM

Take some measurements to verify, but you may be able to use an axle flip kit for a squarebody. If your axle tube diameter is the same as a truck 12 bolt from the 70s, and the leaf spring width is the same, in theory, it should work

SCOTI · 03-02-2025, 12:43 PM

Quote:

Originally Posted by cwcarpenter98

Take some measurements to verify, but you may be able to use an axle flip kit for a squarebody. If your axle tube diameter is the same as a truck 12 bolt from the 70s, and the leaf spring width is the same, in theory, it should work

Pre-73 GM truck leafs were narrower (2.25 vs. 2.5") IIRC. A later model flip kit might require some trimming or tweaking but could provide some useful parts.

PapaJbbq · 03-03-2025, 07:58 PM

The squarebody frame is taller and narrower than the Gen 1 frame, A flip kit for one won't work for the other.
Get some 1/4 x 4" flat bar and build your own.

SCOTI · 03-04-2025, 10:48 AM

Quote:

Originally Posted by PapaJbbq

The squarebody frame is taller and narrower than the Gen 1 frame, A flip kit for one won't work for the other.
Get some 1/4 x 4" flat bar and build your own.

I'm curious.... How does the frame rail differences between the two eras have an impact w/the flip kit method of lowering?

PapaJbbq · 03-05-2025, 01:24 PM

I was referring to installing a C-notch. I neglected to mention my 66 GMC will need a notch to flip the axle, because I'll get a 5" drop, but only have about 2" of travel before the flipped axle hits the frame.
The C-notch method will be the same between generations, but the frame dimensions are different. So, pre-cut pieces for a squarebody will not fit the frame of a 60-65.
Sorry for the incomplete information.

Here's something that might be useful:
76 C10 12-bolt axle tube dia = 3"
Spring width = 2-1/2"
66 Dana 44 axle Tube dia = 2-5/8"
Spring width = 2-3/8"

SCOTI · 03-06-2025, 12:14 PM

Quote:

Originally Posted by PapaJbbq

I was referring to installing a C-notch. I neglected to mention my 66 GMC will need a notch to flip the axle, because I'll get a 5" drop, but only have about 2" of travel before the flipped axle hits the frame.
The C-notch method will be the same between generations, but the frame dimensions are different. So, pre-cut pieces for a squarebody will not fit the frame of a 60-65.
Sorry for the incomplete information.

Here's something that might be useful:
76 C10 12-bolt axle tube dia = 3"
Spring width = 2-1/2"
66 Dana 44 axle Tube dia = 2-5/8"
Spring width = 2-3/8"

Gotcha.

02-26-2025, 07:25 PM	#1
Artie Sellars Registered User Join Date: Jul 2019 Location: Tallahassee, Fl Posts: 1	1964 GMC 1000 axle flip kit I’ve been lurking around here forever and I can usually find what I need just by researching this site. However, I can’t seem to find anything about this. Does anyone have a source for an axle flip kit for a 1964 GMC? Plenty of stuff for Chevrolets but nothing for the GMC’s with leaf spring rear ends.

02-26-2025, 09:25 PM	#2
karlbenz Registered User Join Date: Nov 2008 Location: kannapolis, nc Posts: 546	Re: 1964 GMC 1000 axle flip kit good luck. Not a lot out there for GMC specific stuff __________________ 2000 c3500 utility bed 7.4l 5sp manual old body style. Cab and chassis 1964 GMC K10 383cu in/sm465/twin stick np205 1965 Chevy C60

03-02-2025, 11:10 AM	#3
cwcarpenter98 Senior Member Join Date: Jan 2018 Location: Hickory Flat, GA Posts: 4,506	Re: 1964 GMC 1000 axle flip kit Take some measurements to verify, but you may be able to use an axle flip kit for a squarebody. If your axle tube diameter is the same as a truck 12 bolt from the 70s, and the leaf spring width is the same, in theory, it should work __________________ Christian Carpenter 1963 C10 - Frankentruck 283, Muncie 3 speed with overdrive Overdrive wiring here 1963-ish truck bed trailer - Half-Wit 1981 C10 - Penny 305, th350 --> Soon to be 350, Saginaw 4 speed 1995 Dodge Dakota Sport "I'll put it simple: if you're going hard enough left, you'll find yourself turning right." - Doc Hudson

03-03-2025, 07:58 PM	#5
PapaJbbq Registered User Join Date: Sep 2020 Location: Tuscaloosa, AL Posts: 14	Re: 1964 GMC 1000 axle flip kit The squarebody frame is taller and narrower than the Gen 1 frame, A flip kit for one won't work for the other. Get some 1/4 x 4" flat bar and build your own.

03-05-2025, 01:24 PM	#7
PapaJbbq Registered User Join Date: Sep 2020 Location: Tuscaloosa, AL Posts: 14	Re: 1964 GMC 1000 axle flip kit I was referring to installing a C-notch. I neglected to mention my 66 GMC will need a notch to flip the axle, because I'll get a 5" drop, but only have about 2" of travel before the flipped axle hits the frame. The C-notch method will be the same between generations, but the frame dimensions are different. So, pre-cut pieces for a squarebody will not fit the frame of a 60-65. Sorry for the incomplete information. Here's something that might be useful: 76 C10 12-bolt axle tube dia = 3" Spring width = 2-1/2" 66 Dana 44 axle Tube dia = 2-5/8" Spring width = 2-3/8" Last edited by PapaJbbq; 03-05-2025 at 01:56 PM.



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