8.8 Tone Ring
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Fleet Mechanic
Joined: Aug 2015
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From: Candy Mountain
8.8 Tone Ring
Finishing up the details on an 8.8. I picked up a new Ford tone ring, I was surprised to see it does not have an alignment tab.
Am I correct in thinking that the index of the ring does not matter so long as it correctly seated on the carrier?
The spacing to the sensor would vary depending on the shiming of the carrier so it must work within a range.
Thanks!
Am I correct in thinking that the index of the ring does not matter so long as it correctly seated on the carrier?
The spacing to the sensor would vary depending on the shiming of the carrier so it must work within a range.
Thanks!
Fleet Mechanic
Joined: Oct 2025
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So for 3 days, she couldn’t park in the garage since I had it torn apart. I made sure I was very meticulous about everything and took enough breaks to pass time! Haha
I also replaced the perches, so 7 hours of grinding and hammering..
Last edited by 90project5.0; May 29, 2026 at 05:47 PM.
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Fleet Mechanic
Joined: Aug 2015
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From: Candy Mountain
Yes, yes. But does the lack of indexing tab matter? My understanding, seems like it doesn't but I have been wrong on occasion.
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From: Near Salt Lake City
I've never read or heard anything about not being able to swap them over to a new carrier
I will double check in a manual
Swap away, the ring gear bolts just hold it tight to the face of the carrier behind the ring with NO INDEXING TAB
I will double check in a manual
Swap away, the ring gear bolts just hold it tight to the face of the carrier behind the ring with NO INDEXING TAB
Hotshot
Joined: Jun 2015
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That was taken from my 1989 Ford Service manual. What manual are you going to check?
Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
The tone ring doesn't have to be indexed to any specific point on the carrier (unless the tab interferes with the carrier in a way that doesn't allow it to be seated in the correct position to be read by the speed sensor).
Stick it on and run it....the sensor doesn't read position, it just reads the frequency of "teeth" passing by it. I've built rear axles for many of these pickups that had/didn't have the tone ring that needed it. There are a couple running around the county with 2 or 3 tack welds holding them on the carrier and the indexing tab ground off.
Stick it on and run it....the sensor doesn't read position, it just reads the frequency of "teeth" passing by it. I've built rear axles for many of these pickups that had/didn't have the tone ring that needed it. There are a couple running around the county with 2 or 3 tack welds holding them on the carrier and the indexing tab ground off.
Last edited by cleatus12r; May 31, 2026 at 04:33 PM.
Butt-Head
Joined: Apr 2004
Posts: 9,453
Likes: 2,936
From: Reed Point, MT
As a testament to how rudimentary these things are, the 8.8" in my 1994 Crown Vic didn't have a provision for a ring gear tone ring as the vehicle speed sensor was run off of a sensor on the tailshaft housing of the transmission. Well, a 2000 4R100 doesn't have a specific transmission-mounted speedometer pickup (and I didn't want to introduce any weird PCM issues by doubling up the output shaft speed sensor that feeds the PCM directly) so I found a way to get the analog speed signal to the ABS module (needed for 1999-up pickups to turn the analog signal to digital for the PCM) by machining and mounting a Polaris snowmobile primary drive sprocket to the back of the pinion yoke and mounting a Chevy S-10 front wheel speed sensor to a bracket bolted to the differential housing near the pinion.
A little bit of math (converting tone ring tooth count to pinion rotations - approximately 3.08:1- to get to the tooth count of the primary drive sprocket) and a $100 signal generator from Dakota Digital to correct a 3% error, and I was golden.
A little bit of math (converting tone ring tooth count to pinion rotations - approximately 3.08:1- to get to the tooth count of the primary drive sprocket) and a $100 signal generator from Dakota Digital to correct a 3% error, and I was golden.
Last edited by cleatus12r; May 31, 2026 at 04:45 PM.
Thread Starter
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Fleet Mechanic
Joined: Aug 2015
Posts: 1,835
Likes: 364
From: Candy Mountain
The tone ring doesn't have to be indexed to any specific point on the carrier (unless the tab interferes with the carrier in a way that doesn't allow it to be seated in the correct position to be read by the speed sensor).
Stick it on and run it....the sensor doesn't read position, it just reads the frequency of "teeth" passing by it. I've built rear axles for many of these pickups that had/didn't have the tone ring that needed it. There are a couple running around the county with 2 or 3 tack welds holding them on the carrier and the indexing tab ground off.
Stick it on and run it....the sensor doesn't read position, it just reads the frequency of "teeth" passing by it. I've built rear axles for many of these pickups that had/didn't have the tone ring that needed it. There are a couple running around the county with 2 or 3 tack welds holding them on the carrier and the indexing tab ground off.