Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive

Forums Calendar Active Threads Search Forum Help
Previous Thread
Next Thread
Print Thread
A518 speedo drive question #844065
11/02/10 06:37 AM 11/02/10 06:37 AM
Joined: May 2010
Posts: 219
Southwest
way2fast Offline OP
enthusiast
way2fast  Offline OP
enthusiast

Joined: May 2010
Posts: 219
Southwest
Now that I have the 518/46RH in my 1978 club cab I need to convert it over from the electronic speedo drive to cable operated...what do I need?

Go Fast and Swerve!
Re: A518 speedo drive question [Re: way2fast] #844066
11/02/10 09:38 AM 11/02/10 09:38 AM
Joined: Apr 2003
Posts: 12,237
Looking for a way out of Middl...
IMGTX Offline
I Live Here
IMGTX  Offline
I Live Here

Joined: Apr 2003
Posts: 12,237
Looking for a way out of Middl...
Assuming you are not using the Factory ECM to control the Transmission you don't need anything.

The factory electronic speed sensors fit in the same hole the older speedometer drive gear adapters fit in. It's a drop in swap.

If you need to use both a Cable and a Speed sensor I am working on an adapter. I just haven't tested it yet. I'll let you know if you like.
Re: A518 speedo drive question [Re: IMGTX] #844067
11/02/10 10:06 AM 11/02/10 10:06 AM
Joined: May 2010
Posts: 219
Southwest
way2fast Offline OP
enthusiast
way2fast  Offline OP
enthusiast

Joined: May 2010
Posts: 219
Southwest
Quote:

Assuming you are not using the Factory ECM to control the Transmission you don't need anything.

The factory electronic speed sensors fit in the same hole the older speedometer drive gear adapters fit in. It's a drop in swap.

If you need to use both a Cable and a Speed sensor I am working on an adapter. I just haven't tested it yet. I'll let you know if you like.



So...I just take out the electronic connectors and the cable should screw in? Or do i need a fitting and a drive gear? I started this project with no motor and trans so I've got no reference.

Go Fast and Swerve!
Re: A518 speedo drive question [Re: way2fast] #844068
11/02/10 10:35 AM 11/02/10 10:35 AM
Joined: May 2004
Posts: 4,920
Joplin, MO USA
Robbins Offline
master
Robbins  Offline
master

Joined: May 2004
Posts: 4,920
Joplin, MO USA
Quote:

Quote:

Assuming you are not using the Factory ECM to control the Transmission you don't need anything.

The factory electronic speed sensors fit in the same hole the older speedometer drive gear adapters fit in. It's a drop in swap.

If you need to use both a Cable and a Speed sensor I am working on an adapter. I just haven't tested it yet. I'll let you know if you like.



So...I just take out the electronic connectors and the cable should screw in? Or do i need a fitting and a drive gear? I started this project with no motor and trans so I've got no reference.



You need the gear and housing from an older trans. You'll need a gear that matches you rear gears and tire height.

Like said above it will just drop in.

Moparlee
Re: A518 speedo drive question [Re: Robbins] #844069
11/02/10 12:21 PM 11/02/10 12:21 PM
Joined: May 2010
Posts: 219
Southwest
way2fast Offline OP
enthusiast
way2fast  Offline OP
enthusiast

Joined: May 2010
Posts: 219
Southwest
that's what I needed to know. Thanks!!

Go Fast and Swerve!
Re: A518 speedo drive question [Re: way2fast] #844070
11/02/10 04:59 PM 11/02/10 04:59 PM
Joined: Jan 2003
Posts: 25,899
Rio Linda, CA
John_Kunkel Offline
Too Many Posts
John_Kunkel  Offline
Too Many Posts

Joined: Jan 2003
Posts: 25,899
Rio Linda, CA

The 518 probably has the same speedo pinion adapter as the 3-speeds, the distance sensor just screws on to the same thread that the cable used to.

The INTERNET, the MISinformation superhighway
Re: A518 speedo drive question [Re: John_Kunkel] #844071
11/02/10 05:23 PM 11/02/10 05:23 PM
Joined: Jan 2003
Posts: 28,068
Irving, TX
feets Offline
Senior Management
feets  Offline
Senior Management

Joined: Jan 2003
Posts: 28,068
Irving, TX
My 92 D250 Cummins has the speed sensor with a wire and a cable attachment. The speedo is still driven the old fashioned way but the computer wants to see the speed too.

We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: A518 speedo drive question [Re: feets] #844072
11/02/10 06:21 PM 11/02/10 06:21 PM
Joined: May 2010
Posts: 219
Southwest
way2fast Offline OP
enthusiast
way2fast  Offline OP
enthusiast

Joined: May 2010
Posts: 219
Southwest
So my next question is... w/3.23 gears and 27 or 28" tires which speedo drive gear do I need?

Go Fast and Swerve!
Re: A518 speedo drive question [Re: way2fast] #844073
11/02/10 06:36 PM 11/02/10 06:36 PM
Joined: Jan 2003
Posts: 32,959
Grand Prairie,Texas
stumpy Offline
I Win
stumpy  Offline
I Win

Joined: Jan 2003
Posts: 32,959
Grand Prairie,Texas
From the tech archives link at the top of the page. It's a great source of info if you use it. http://www.moparts.org/Tech/Archive/auto/12.html
Re: A518 speedo drive question [Re: feets] #844074
11/02/10 08:01 PM 11/02/10 08:01 PM
Joined: Apr 2003
Posts: 12,237
Looking for a way out of Middl...
IMGTX Offline
I Live Here
IMGTX  Offline
I Live Here

Joined: Apr 2003
Posts: 12,237
Looking for a way out of Middl...
Quote:

My 92 D250 Cummins has the speed sensor with a wire and a cable attachment. The speedo is still driven the old fashioned way but the computer wants to see the speed too.



Just an FYI. They used a 2 wire inline one like you are talking about for several years but the newer ones use a 3 wire one that does not have a cable pass through. If you are doing a ~92 or later trans and using the ECU to control the trans and need a cable then you need another adapter.

If you are using hydraulic & vaccume controllers to work the Lockup & overdrive like most people do then you don't need the speed sensor.

Re: A518 speedo drive question [Re: IMGTX] #844075
11/02/10 09:30 PM 11/02/10 09:30 PM
Joined: May 2005
Posts: 4,744
Florida
BDW Offline
master
BDW  Offline
master

Joined: May 2005
Posts: 4,744
Florida

Re: A518 speedo drive question [Re: BDW] #844076
11/02/10 09:38 PM 11/02/10 09:38 PM
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
R
Rick_Ehrenberg Offline
top fuel
Rick_Ehrenberg  Offline
top fuel
R

Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Yup. And here's an easy way to seem like you know it all: For "average" tire size, just drop the last digit from the axle ratio -- that's the number of pinion teeth you need!

Rick
Re: A518 speedo drive question [Re: IMGTX] #844077
11/03/10 07:37 AM 11/03/10 07:37 AM
Joined: May 2010
Posts: 219
Southwest
way2fast Offline OP
enthusiast
way2fast  Offline OP
enthusiast

Joined: May 2010
Posts: 219
Southwest
Quote:

Quote:

My 92 D250 Cummins has the speed sensor with a wire and a cable attachment. The speedo is still driven the old fashioned way but the computer wants to see the speed too.



Just an FYI. They used a 2 wire inline one like you are talking about for several years but the newer ones use a 3 wire one that does not have a cable pass through. If you are doing a ~92 or later trans and using the ECU to control the trans and need a cable then you need another adapter.

If you are using hydraulic & vaccume controllers to work the Lockup & overdrive like most people do then you don't need the speed sensor.



Yeah, no ECU on this one, just the pressure switches and a vacuum switch!!

Go Fast and Swerve!
Re: A518 speedo drive question [Re: way2fast] #844078
11/03/10 07:39 AM 11/03/10 07:39 AM
Joined: May 2010
Posts: 219
Southwest
way2fast Offline OP
enthusiast
way2fast  Offline OP
enthusiast

Joined: May 2010
Posts: 219
Southwest
Guys, Thanks for all the info!!! This place is amazing!!

Go Fast and Swerve!

Moderated by  Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer 
Privacy Policy · Forum Rules · Mark All Read Contact Us · Moparts




Moparts Main Index | READ - Info & Help Page | Moparts Sponsors | Tech Archive


Powered by UBB.threads™ PHP Forum Software 7.7.1