How to Mod a rear end for traction control

**camarojunky74** · 10-19-2007, 08:02 AM

okay, heres the deal i got another 10 bolt with 4.10's and an ultimate girdle,

i had this in my 99 w/o traction now its coming time for me to put this bitch in my 02 with a 6 speed so its more liveable, the problem is my 02 has traction control, now ive seen the write up on how to mod the rear end i just cant find it anymore any help fellas?

thanks luke

**rel3rd** · 10-19-2007, 03:25 PM

Luke, are you asking how to convert a 3 channel (ABS only) rear, a 4 channel (ABS & ASR) rear?

If so, I had to do this when I swapped rears in my 2000 (equipped with ASR & ABS).

You have to swap backing plates and axles.
I simply used a "drum sander", which is pretty much a big dremel, to get the 1/2" or so of clearance the rear parts axle flanges needed so that the 2 wheel sensors could be installed. I also had to swap in the right axles, which have the reluctor wheels, since the non-ASR axles don't have the reluctors.

If you PM me an email address, I have pics of both rears (and axle sets) so that you can see the differences...and where the 3 channel needs to be clearanced.

**rel3rd** · 10-19-2007, 03:28 PM

btw...if that wasn't what you were asking...please disregard.

**9t8z28** · 10-22-2007, 08:45 AM

Originally Posted by camarojunky74

okay, heres the deal i got another 10 bolt with 4.10's and an ultimate girdle,

i had this in my 99 w/o traction now its coming time for me to put this bitch in my 02 with a 6 speed so its more liveable, the problem is my 02 has traction control, now ive seen the write up on how to mod the rear end i just cant find it anymore any help fellas?

thanks luke

They are the same rear. You will have no problems..

**camarojunky74** · 10-22-2007, 08:57 AM

Originally Posted by 9t8z28

They are the same rear. You will have no problems..

are you reffering to the above post when i mod it? or just slap it in and switch the axles, i thought you had to drill on the rear to get the sensor in or sometihng like taht,

the guy above sent me a bunch of helpfull pics and i now see what the differeance is when you have asr

**rel3rd** · 10-22-2007, 09:12 AM

Originally Posted by 9t8z28

They are the same rear. You will have no problems..

Traction Control (ASR) rears are NOT the same as ABS only rears.

ABS rear (aka 3 channel) has one sensor for antilock brakes that is actually threaded into the top of the axle housing, and the reluctor wheel is pressed onto the carrier right next to the ring gear.

ASR (aka 4 channel or traction control) has one sensor on each backing plate, and a reluctor wheel pressed onto each axle.

The 3 channel rear has a square flange that the backing plate bolts onto.
The 4 channel rear has axle flanges that are factory shaped to clear the wheel speed sensors.

3 channel axles have no reluctor wheels on them.
4 channel axles have reluctor wheels on them.

To make a (ABS only) 3 channel rear work in a (ABS/ASR) 4 channel rear you need to clearance the axle flanges so that the proper backing plates can be bolted on. You also need to swap to the 4 channel axleshafts.

Anybody else that is confused, I can email pics of the obvious differences in the two...

**camarojunky74** · 10-22-2007, 09:21 AM

thanks for clearing it up, , and your much needed info and help

**9t8z28** · 10-22-2007, 05:02 PM

Originally Posted by rel3rd

Traction Control (ASR) rears are NOT the same as ABS only rears.

ABS rear (aka 3 channel) has one sensor for antilock brakes that is actually threaded into the top of the axle housing, and the reluctor wheel is pressed onto the carrier right next to the ring gear.

ASR (aka 4 channel or traction control) has one sensor on each backing plate, and a reluctor wheel pressed onto each axle.

The 3 channel rear has a square flange that the backing plate bolts onto.
The 4 channel rear has axle flanges that are factory shaped to clear the wheel speed sensors.

3 channel axles have no reluctor wheels on them.
4 channel axles have reluctor wheels on them.

To make a (ABS only) 3 channel rear work in a (ABS/ASR) 4 channel rear you need to clearance the axle flanges so that the proper backing plates can be bolted on. You also need to swap to the 4 channel axleshafts.

Anybody else that is confused, I can email pics of the obvious differences in the two...

In 1998, most of the F-Bodys got the 4 channel system regardless of wether they had ASR or not. Show me pics of a 99 or newer?

**rel3rd** · 10-23-2007, 11:08 AM

Originally Posted by 9t8z28

In 1998, most of the F-Bodys got the 4 channel system regardless of wether they had ASR or not. Show me pics of a 99 or newer?

Are you saying those particular cars already had the flanges that would allow the backing plate to accept a wheel speed sensor on both backing plates? Or that the ones you refer to have a total of 4 wheel sensors regardless of ASR option or not? Supposedly since all of the F bodies have two front sensors, the difference between 4 and 3 "channels", is whether it has ABS and one rear sensor on top of the axle housing to pick up signal from ring gear, or ABS and ASR and two rear wheel sensor

Here's a pic of the housing end flange out of my 2000 (which is ASR/ABS equipped):

Here's a stock 3 channel (ABS only) housing end flange (before I clearanced it for wheel speed sensor):

Stock 3 channel axleshaft:

Stock 4 channel axleshaft:

Bottom line is this...

If your axle flanges are not clearanced or shaped like the top picture shows, than the wheel sensors will not clear them and will not bolt into the backing plates.

**9t8z28** · 10-23-2007, 02:19 PM

All I see are red X's!

I have a 3 channel and a 4 channel rear at home. I converted my 3 channel rear out of my 97 to work in a 98 w/ 4 channels. I already know what it all looks like. I want you to show me a 99 or newer rear that has the 3 channel setup?