3 channel to 4 channel diff swap.
08-15-2014, 12:34 AM
#1
3 channel to 4 channel diff swap. I have an 02 formula non traction control, that I swapped the rear today with one from a M6 car. The formula had 2.73's while the camaro the other rear came from had the stock 3.42's. I drove the car around the block and the brakes seemed fine, but the Low Trac light was staying on and I don't remember this car ever showing that. When I swapped the rear ends, I also swapped the brake lines. Are there any issues with this? If so, is it anything hat can be tuned out? I have access to HP Tuners.
After reading another post I feel I should clarify.
I swapped the entire rear end, not just the carriers.
When I drove the car I wasn't getting any ABS inop light, just the Low Trac light. Brakes worked but I was getting that grinding rocks feel in my pedal, stopped fine though.
After reading another post I feel I should clarify.
I swapped the entire rear end, not just the carriers.
When I drove the car I wasn't getting any ABS inop light, just the Low Trac light. Brakes worked but I was getting that grinding rocks feel in my pedal, stopped fine though.
Last edited by Mongoose350; 08-15-2014 at 12:49 AM.
08-15-2014, 06:53 AM
#2
You mentioned 4 channel in the title but not in the post.
02 formula 2.73s' (A4 ?) 3 channel ABS.
M6 3.42s' (M6)(4 channel ABS & TC ?).
If above is true,you put a 4 channel rear into a 3 channel car. ABS will no longer function. A 3 channel car needs the carrier reluctor ring AND sensor at the top of the rearend. The two sensors on the axle ends of the 4 channel rearend will NOT integrate/compatable with the 3 channels' vehicle electronics.
02 formula 2.73s' (A4 ?) 3 channel ABS.
M6 3.42s' (M6)(4 channel ABS & TC ?).
If above is true,you put a 4 channel rear into a 3 channel car. ABS will no longer function. A 3 channel car needs the carrier reluctor ring AND sensor at the top of the rearend. The two sensors on the axle ends of the 4 channel rearend will NOT integrate/compatable with the 3 channels' vehicle electronics.
08-15-2014, 12:30 PM
#3
Yes the formula is A4 with 2.73's non TC, so 3 channel. The other was 3.42 M6 diff with TC, so 4 channel. Is there no way to make this work? I have the other car that I can swap parts over with. In the meantime, can I drive the car? I kinda don't have a choice...
08-15-2014, 02:12 PM
#4
It'll just drive like a non-ABS car,regular old-time brakes.
Not really sure what you meant by you swapped the brake lines. A 3 channel ABS system has one line running from the front to a splitter/tee at the rearend. A 4 channel system has two lines running from the front,each line going to one wheel.
Not really sure what you meant by you swapped the brake lines. A 3 channel ABS system has one line running from the front to a splitter/tee at the rearend. A 4 channel system has two lines running from the front,each line going to one wheel.
08-15-2014, 05:06 PM
#7
Yes. I drove the car around today, even in traffic on the highway. No problems. It stops just as well as before. I don't have the pulsing feel to the pedal, but that's of course due to the abs being off. I know if I slam the pedal to the floor it will lock but I rearly need to brake hard anyway.
The old rearend was making noise from somewhere. Not a whine, more of a whering sound. This one doesn't. So I'll get some new gears for the old 3 channel and when I have done I'll throw it back in.
The old rearend was making noise from somewhere. Not a whine, more of a whering sound. This one doesn't. So I'll get some new gears for the old 3 channel and when I have done I'll throw it back in.
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08-15-2014, 05:59 PM
#8
the 02 A4 2.73 would have had a 2 series Torsen posi. Do you know what year the 3.42 rearend is ? 2.73 to 3.42 is a 25% increase of torque to the rear wheels,feels better doesn't it. Speedo is off that much too,60mph indicated is actually 75mph,unless you've already had the correction put into the computer.
