Driveshaft for short bed LS swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

NCDEERE · 10-03-2025, 03:30 PM

I'm deep into swapping an LQ9 into a 72 short bed. I am using LSX Innovations motor plates and factory engine mounts, 4L65E built and a factory 12 bolt. I was contemplating having a custom shaft built but decided to do a little junkyard crawl. A factory Crown Vic 1350 shaft fit my needs perfectly. I ordered a 1350 series 27 spline slip yoke for the front and will use a Moog 348 conversion joint for the rear. It fits perfectly. My yard happened to have several police interceptors in, and they have 3.5" aluminum shafts that were high speed balanced, the family car usually has a steel shaft.

leegreen · 10-03-2025, 06:45 PM

^ that is the kind of information I love to find on forums. I don't need it right now but good post!

recording the actual length of the crown vic shaft may help people doing other combinations

**WorldsCrappiestTruck** · 10-03-2025, 08:38 PM

Do you recall the year on the crown Vic?

I went with this

https://www.alldrivelines.com/1967-1...veshaft-steel/

Awesome intel on the crown Vic shaft.

LS short box · 10-03-2025, 09:06 PM

After your mods to the drive shaft are you going to have it balanced? You should.

NCDEERE · 10-03-2025, 10:03 PM

The Crowns have a 55.5" +- center to center 1350 shaft from about 1995 to 2012. Total length is listed as 64.62". Most of them are steel in the family cars but the police interceptors came with a 3.5" aluminum shaft that was high speed balanced and designed for the extra abuse. The only change I'm making is the front slip yoke which will not require balancing. I have been contemplating changing to an 8.8 diff at some point and this shaft will bolt right up with the factory rear flange yoke reinstalled. There is also a long wheelbase Crown that lists a longer shaft.

**WorldsCrappiestTruck** · 10-05-2025, 06:35 PM

Jumping on the bandwagon - will see how it all goes. 😎

NCDEERE · 10-09-2025, 07:13 PM

I installed mine today. With a standard length 3-3-6081X 1350 series 27 spline yoke and a 1350 to 1310 rear conversion joint it fit perfectly. Measure first to make sure the 55.5" center to center will work for you. There are many variables in engine mounts.

Accelo · 10-09-2025, 08:59 PM

Quote:

Originally Posted by NCDEERE

I installed mine today. With a standard length 3-3-6081X 1350 series 27 spline yoke and a 1350 to 1310 rear conversion joint it fit perfectly. Measure first to make sure the 55.5" center to center will work for you. There are many variables in engine mounts.

Love you post. Has facts and part numbers. Great job.

10-03-2025, 03:30 PM	#1
NCDEERE Registered User Join Date: May 2025 Location: Chocowinity North Carolina Posts: 22	Driveshaft for short bed LS swap I'm deep into swapping an LQ9 into a 72 short bed. I am using LSX Innovations motor plates and factory engine mounts, 4L65E built and a factory 12 bolt. I was contemplating having a custom shaft built but decided to do a little junkyard crawl. A factory Crown Vic 1350 shaft fit my needs perfectly. I ordered a 1350 series 27 spline slip yoke for the front and will use a Moog 348 conversion joint for the rear. It fits perfectly. My yard happened to have several police interceptors in, and they have 3.5" aluminum shafts that were high speed balanced, the family car usually has a steel shaft.

10-03-2025, 06:45 PM	#2
leegreen Registered User Join Date: Mar 2022 Location: Surrey BC Posts: 1,397	Re: Driveshaft for short bed LS swap ^ that is the kind of information I love to find on forums. I don't need it right now but good post! recording the actual length of the crown vic shaft may help people doing other combinations

10-03-2025, 08:38 PM	#3
WorldsCrappiestTruck Senior Member Join Date: Mar 2022 Location: Hinesburg Vermont Posts: 350	Re: Driveshaft for short bed LS swap Do you recall the year on the crown Vic? I went with this https://www.alldrivelines.com/1967-1...veshaft-steel/ Awesome intel on the crown Vic shaft.

10-03-2025, 09:06 PM	#4
LS short box Registered User Join Date: Jun 2015 Location: Carlos MN Posts: 2,592	Re: Driveshaft for short bed LS swap After your mods to the drive shaft are you going to have it balanced? You should.

10-03-2025, 10:03 PM	#5
NCDEERE Registered User Join Date: May 2025 Location: Chocowinity North Carolina Posts: 22	Re: Driveshaft for short bed LS swap The Crowns have a 55.5" +- center to center 1350 shaft from about 1995 to 2012. Total length is listed as 64.62". Most of them are steel in the family cars but the police interceptors came with a 3.5" aluminum shaft that was high speed balanced and designed for the extra abuse. The only change I'm making is the front slip yoke which will not require balancing. I have been contemplating changing to an 8.8 diff at some point and this shaft will bolt right up with the factory rear flange yoke reinstalled. There is also a long wheelbase Crown that lists a longer shaft. Last edited by NCDEERE; 10-03-2025 at 10:09 PM.

10-05-2025, 06:35 PM	#6
WorldsCrappiestTruck Senior Member Join Date: Mar 2022 Location: Hinesburg Vermont Posts: 350	Re: Driveshaft for short bed LS swap Jumping on the bandwagon - will see how it all goes. 😎 Attached Images

10-09-2025, 07:13 PM	#7
NCDEERE Registered User Join Date: May 2025 Location: Chocowinity North Carolina Posts: 22	Re: Driveshaft for short bed LS swap I installed mine today. With a standard length 3-3-6081X 1350 series 27 spline yoke and a 1350 to 1310 rear conversion joint it fit perfectly. Measure first to make sure the 55.5" center to center will work for you. There are many variables in engine mounts.



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