14 Bolt Rear End questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Android04** · 10-30-2021, 10:22 AM

So I'm currently in the market for a SRW 14Bolt Rear End and I've read a few forums and Pirate 4X4 sites and just wanted to get some input.

I'm looking to purchase a 14bolt SRW out of a 88-98 OBS, and was curious if I would have any issues with it fitting a 1985 C30 or should I continue my hunt for a 73-87 SRW?

I'm sure this is out there, but I've not had any luck so far. Thanks everyone

**kwmech** · 10-30-2021, 10:39 AM

What is in the 85 now

ky-donzi · 10-31-2021, 09:29 AM

You will need to verify what I’m typing

But

I know there are different widths of these axles depending on whether the donor truck was a dually, a fleet side, or a cab chassis.

Also I’m almost positive the spring perches were further outbound on the 88-99 generation trucks. The frames were wider

So with that said I think there are about 5 different axles that at first glance look the same

ACS · 10-31-2021, 09:59 AM

The spring perches are different spacing between square body and OBS. Not a big deal if you can weld, but not bolt in.

Ziegelsteinfaust · 11-01-2021, 05:55 PM

The only reason I would go with the later axle would be to widen my rear end track width.

It will need new spring mounts, and the shock mounts relocated.

I have done it with the 14 bolt SF, and it takes a bit of work. To get it to line up, but I was happy with the results. Prefect rear stance while being able to rotate tires all with out spacers.

**Android04** · 11-03-2021, 02:10 PM

Thanks everyone. I found a 73-87 SRW 14bolt locally

sweetk30 · 11-03-2021, 06:22 PM

Just a heads up .

2wd and 4wd have different shock mount positions.

And there is 3/4ton will not bolt in to 1ton as they have the wider spring spacing .

There is 3/4 ton crew cab 2wd that is 1ton under its body .

Mike C · 11-03-2021, 08:59 PM

To clarify, one ton trucks (or 30 series) have spring perches at 40.5” while 3/4” ton trucks have spring spacing at 42.5”

**Desert1957** · 11-25-2021, 12:11 PM

Quote:

Originally Posted by Mike C

To clarify, one ton trucks (or 30 series) have spring perches at 40.5” while 3/4” ton trucks have spring spacing at 42.5”

Is this measurement center to center?

10-30-2021, 10:22 AM	#1
Android04 Senior Member Join Date: Aug 2017 Location: Louisville, KY Posts: 361	14 Bolt Rear End questions So I'm currently in the market for a SRW 14Bolt Rear End and I've read a few forums and Pirate 4X4 sites and just wanted to get some input. I'm looking to purchase a 14bolt SRW out of a 88-98 OBS, and was curious if I would have any issues with it fitting a 1985 C30 or should I continue my hunt for a 73-87 SRW? I'm sure this is out there, but I've not had any luck so far. Thanks everyone

10-30-2021, 10:39 AM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,387	Re: 14 Bolt Rear End questions What is in the 85 now

10-31-2021, 09:29 AM	#3
ky-donzi Registered User Join Date: Jun 2012 Location: madisonville ky Posts: 310	Re: 14 Bolt Rear End questions You will need to verify what I’m typing But I know there are different widths of these axles depending on whether the donor truck was a dually, a fleet side, or a cab chassis. Also I’m almost positive the spring perches were further outbound on the 88-99 generation trucks. The frames were wider So with that said I think there are about 5 different axles that at first glance look the same __________________ 61 GMC 4x4 1-ton flatbed 4bt cummins, ranger od, sm465, np 205, d60F, d70R 4.11 10,000 ramsey PTO winch.... SOLD 73 k5 gm crate 350-265 / sm465 / np205 3.73 posi

10-31-2021, 09:59 AM	#4
ACS Registered User Join Date: Feb 2017 Location: Ontario Canada Posts: 133	Re: 14 Bolt Rear End questions The spring perches are different spacing between square body and OBS. Not a big deal if you can weld, but not bolt in.

11-01-2021, 05:55 PM	#5
Ziegelsteinfaust Registered User Join Date: Dec 2012 Location: Temple City Posts: 3,558	Re: 14 Bolt Rear End questions The only reason I would go with the later axle would be to widen my rear end track width. It will need new spring mounts, and the shock mounts relocated. I have done it with the 14 bolt SF, and it takes a bit of work. To get it to line up, but I was happy with the results. Prefect rear stance while being able to rotate tires all with out spacers.

11-03-2021, 02:10 PM	#6
Android04 Senior Member Join Date: Aug 2017 Location: Louisville, KY Posts: 361	Re: 14 Bolt Rear End questions Thanks everyone. I found a 73-87 SRW 14bolt locally

11-03-2021, 06:22 PM	#7
sweetk30 Registered User Join Date: May 2012 Location: horseheads,ny rust belt Posts: 2,794	Re: 14 Bolt Rear End questions Just a heads up . 2wd and 4wd have different shock mount positions. And there is 3/4ton will not bolt in to 1ton as they have the wider spring spacing . There is 3/4 ton crew cab 2wd that is 1ton under its body . __________________ 77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great.

11-03-2021, 08:59 PM	#8
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,709	Re: 14 Bolt Rear End questions To clarify, one ton trucks (or 30 series) have spring perches at 40.5” while 3/4” ton trucks have spring spacing at 42.5” __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax



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