EFI know how

Reply Subscribe

Thread Tools

Search this Thread

Dec 17, 2006 | 07:28 AM

buckethead5k

Thread Starter

Junior User

Joined: Mar 2006

Posts: 72

Likes: 0

EFI know how

how do you hook up a vehicle speed sensor to a 1972 ford 9inch rear end, or do I need to replace the whole axle?

Dec 17, 2006 | 07:31 AM

Bob Ayers

Postmaster

Joined: Jan 2003

Posts: 4,417

Likes: 3

From: Durham, NC

You will have to change out the entire rear dif. The ring gear is also different with a speed sensor.

Dec 17, 2006 | 08:41 AM

wizzard351

Postmaster

Joined: Sep 2004

Posts: 3,166

Likes: 2

From: wi

i suprised know on has made some sort of swap kit to do that.i want to 9" my 92 and that senser is the only thing holdin me back.

Dec 17, 2006 | 08:47 AM

jowilker

Fleet Owner

Joined: Jun 1999

Posts: 24,552

Likes: 74

From: Creedmoor, North Carolina

I don't know that it has much value, and likely isn't too high on the list or is costly.
I also suspect that it will take an auto computer to run one.

my 2

John

Dec 17, 2006 | 08:57 AM

buckethead5k

Thread Starter

Junior User

Joined: Mar 2006

Posts: 72

Likes: 0

well I am putting an EFI on my 72 truck and would like to bypass the vss if possible but I am told that it affects fuel delivery on decel, does anyone know if it can be bypassed?

Dec 17, 2006 | 10:38 AM

FordBoypete

Posting Guru

Joined: Jul 2003

Posts: 2,222

Likes: 1

From: East Central Florida

The VSS goes in the speedometer drive hole in tail shaft of transmission. At least the ones I deal with do. They include CFI/ SD EEC IV, SEFI/ TP EFI w/EEC IV and the MAFS/ TP EFI w/ EEC IV and that is with or without AOD transmissions.

I have a 9" under my 88F-150 ( which I retro fitted a couple years ago) & it has a T-5 Manual. The VSS goes there in that set up also. . .

And No VSS is integral to operation of All FoMoCo systems. If we're talking about After Market EFIs, I don't have a clue nor any interest to find out.

FBp

Dec 18, 2006 | 09:11 AM

TigerDan

Hotshot

Joined: May 2004

Posts: 12,170

Likes: 5

From: The hills of No. Calif.

The sensor in the rear axle is for the Anti-lock brake system, the one for the EFI is the one on the tranny as FBP said. Don't worry about it, as I doubt you're concerned with trying to swap ABS into the '72...

Top 10 Fords at 2026 Carlisle Ford Nationals

Joe Kucinski

3 Best / 3 Worst Parts of Modern Ford Ownership

Brett Foote

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

Pouria Savadkouei

Every 2026 Ford Engine Explained

Brett Foote

10 Ugly Ford Trucks That We Still Kinda Love

Joe Kucinski

10 Things Every Truck Owner NEEDS (2026 Edition)

Michael S. Palmer

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Verdad Gallardo

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Joe Kucinski

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Brett Foote

Top 10 Ford Truck Tragedies

Joe Kucinski

Dec 18, 2006 | 10:38 AM

Bob Ayers

Postmaster

Joined: Jan 2003

Posts: 4,417

Likes: 3

From: Durham, NC

Quote:

Originally Posted by TigerDan

If he is going to use an auto tranny, with the auto PCM, he is going to need it.

Dec 18, 2006 | 03:05 PM

#10

leadmic

Fleet Mechanic

Joined: Feb 2002

Posts: 1,483

Likes: 273

From: Tulare U.S.A.

Quote:

Originally Posted by TigerDan

This is true until about 92 when ford figured out they could use one sensor to run the ABS and the speedo. They used the axle sensor to do both jobs but the signal was wrong for the ECM so when they changed in 92 they also went to a electronic speedo with a signal converter to give the proper signal to the ECM. The speedo/signal converter was called a PSOM and it could be reprogramed for larger or smaller tires. After 92 their was no sensor in the tranny until like 99 I think (not sure about the 99 year). The simplist way I can see to do this is to change the rear axle to a newer style that has the tone ring. I think it could be done by running a sensor off the trans but Im not sure what it would take unless you are going to an EFI system that is older than a 92 in which case it would be a bolt and plug in deal.
Leadmic