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3.07 rear diff from '97 C36 into '95 C36 with ASR
- Thread starter yao500e
- Start date
You'll need to figure out how to correct the speedometer signal to read accurately, if the W202 reads the transmission output shaft or rear wheels, for a speed signal. I don't know how the W202 works. @2phast might know.
ASR doesn't care about axle ratio.
Are you sure you want to bother changing for such a small difference in ratio?
95 has the old 4 speed box.the latest 97 c36 has the NAG 1 5speed gearbox.this controlled from ecu(Gearbox)
your swap will be work .Only the speedo goes wrong.
GSXR w210 e420 and 430 has an 2,82 diff the AMG has e50/55 3,06 i found this is notisable .ist feel 50ps more
your swap will be work .Only the speedo goes wrong.
GSXR w210 e420 and 430 has an 2,82 diff the AMG has e50/55 3,06 i found this is notisable .ist feel 50ps more
Thank you. I wasnt sure if a '97 C36 3.07 rear differential would work properly with my '95 C36 because the the 4 speed 722.3 as well as ASR and any wiring connects that is needed on the rear differential. I supposed if i want 3.07 gears, best would be just to install 3.07 ring pinion into my stock rear differential?
3.07 doesnt seem much but small bump would be nice.
@Markus-MD @gsxr
@gsxrYou'll need to figure out how to correct the speedometer signal to read accurately, if the W202 reads the transmission output shaft or rear wheels, for a speed signal. I don't know how the W202 works. @2phast might know.
ASR doesn't care about axle ratio.
Are you sure you want to bother changing for such a small difference in ratio?
Is there anything different about a rear diff from an ASR car vs a rear diff from a car without ASR? any wiring connections go to the rear diff with an ASR car?
thank you
Depends on the exact year and model. For early 90's diffs, yes, the are not the same and NOT interchangeable. This applies to ALL years/models of the 124 chassis.
Starting in the mid-90's (varies with chassis) the rear axle speed sensors were relocated from the diff to the wheel carrier, and the diffs are the same for both without traction control (no ASR/ESP) or with traction control (ASR/ESP). All 210 chassis have the sensors at the wheel carrier, not the diff.
The 140 changed mid-production... not sure about the 202.
hello @Markus-MD
you are correct to buy a whole rear differential but if my car has ASR, does a rear differential need to have ASR connections on it? i am not sure. trying to find out.
Thank you.
EPC indicates that 1995-up C36 AMG should not have the speed sensors at the differential. However, I don't know if anything else may be different.
Hi @gsxrEPC indicates that 1995-up C36 AMG should not have the speed sensors at the differential. However, I don't know if anything else may be different.
Thank you I also asked Gemini AI and it said there are no ASR sensors or any attachments on the Rear diff. So does that mean any compatible rear diff. can work for a '95 C36? From my research, w210, w208 and r170 rear diffs all seem to fit. Your thoughts?
Here is what Gemini states:
On a 1995 Mercedes W202 with ASR, there are no direct ASR connections on the rear differential itself; instead, the ASR system uses the ABS wheel speed sensors located on each wheel's hub assembly to detect slip, and it then applies individual rear brakes to provide the anti-slip function. The ASR controller also interacts with the engine's torque.
Here's a breakdown of how the ASR system works and why there aren't specific ASR connections on the rear differential:
- Wheel Speed Sensors:
The ASR system relies on wheel speed sensors, which are typically integrated into the ABS system. These sensors are located at each wheel hub, not on the differential.
- ABS Pump and Valves:
The ASR system uses the same ABS hydraulic unit to apply the brakes. When wheel slip is detected, the system can individually apply the rear brakes to mimic a locking differential, providing better traction.
- Engine Torque Control:
In addition to the brakes, the ASR system can also limit engine torque by controlling the engine's throttle, further helping to maintain traction.
- No Differential Connection:
Because the ASR system works by sensing wheel speed and then braking individual wheels, it doesn't need to physically connect to or control the differential itself.
Depends if the housing, rear cover, input flange, and output (side) flanges are the same or not. All of those items can be different. You need to look up your car in the EPC and figure out which part numbers are on your car, then do the same for any potential donor diff. My "differential" spreadsheet has all this data for the 124 chassis and possible interchanges from the 129/140. You'd need to do something similar with the 202 and 170/208/210 donors.
actually, perfect information. A friend of mine in Costa Rica who has a USA 1995 C36 with ASR did an LSD rear diff swap. He confirmed there are not sensors on the rear diff at all
He said the sensors are on near the wheels, the 48 teeth CV axle shaft is my guess for the ASR ABS sensors!
@gsxr
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