A Mercedes 722.5 gearbox or someone breaking a 5 Speed W124

[ChasR]

As above.

I need a Mercedes 722.503 transmission. If someone is breaking a car with this transmission please let me know .

[bmwmaniac]

upgrade to a 722.6

[ChasR]

Oct 11, 2018 19:07:08 GMT bmwmaniac said:

upgrade to a 722.6

How easy is this to do?

I was looking at potentially going to a 722.4 but I'm aware I'll still need the following:

-Engine ECU (they're different on a 5 speed)
-Transmission ECU
-Possibly even a new wiring harness for both the 'box and the engine.

Was the 722.6 even used on an M104 engined Merc?

[bmwmaniac]

Indeed they were fitted to M104, same bellhousing as M103 m111 and OM605/6
722.6 standalone

[carat 3.6]

Oct 14, 2018 1:23:05 GMT ChasR said:

Oct 11, 2018 19:07:08 GMT bmwmaniac said:

upgrade to a 722.6

How easy is this to do?

I was looking at potentially going to a 722.4 but I'm aware I'll still need the following:

-Engine ECU (they're different on a 5 speed)
-Transmission ECU
-Possibly even a new wiring harness for both the 'box and the engine.

Was the 722.6 even used on an M104 engined Merc?

If we are talking about your sportline 320, you don't need to replace any of the things you mentioned. The only thing that you might want to change is the diff, as the 4 speed likes a high ratio.

For the 722.6 conversion you need the gearbox from a early w210 e320, this is an m104 so a direct swap. You then need the aftermarket controller to make it work though.

[ChasR]

Cheers for the input folks! It's nice to know that I have options. Well, options that are more viable thank expected .

Oct 14, 2018 9:26:03 GMT carat 3.6 said:

Oct 14, 2018 1:23:05 GMT ChasR said:

How easy is this to do?

I was looking at potentially going to a 722.4 but I'm aware I'll still need the following:

-Engine ECU (they're different on a 5 speed)
-Transmission ECU
-Possibly even a new wiring harness for both the 'box and the engine.

Was the 722.6 even used on an M104 engined Merc?

If we are talking about your sportline 320, you don't need to replace any of the things you mentioned. The only thing that you might want to change is the diff, as the 4 speed likes a high ratio.

For the 722.6 conversion you need the gearbox from a early w210 e320, this is an m104 so a direct swap. You then need the aftermarket controller to make it work though.

That is interesting. Cheers for clearing that up.

I only thought the above as a mate of mine rewired @dicksdasterdley's now sold E280 5 speed (bad engine wiring harness). On that car, he noted the wiring was subtley difference to a 4 speed car, and that the ECUs differed from what he had previously seen on 4 speed cars.

The diff is one thing I forgot about. I take it that is down to the 4th gear in both 'boxs having a 1:1 ratio, hence the benefit of a taller diff in a 4 speed?

I take it with the earlier 'box the prop will still fit from a 5 speed W124?

I ask this question for future purposes . While the 722.6 does add expense it does look like alot of benefits can come about from it.

[carat 3.6]

Oct 14, 2018 18:57:00 GMT ChasR said:

Cheers for the input folks! It's nice to know that I have options. Well, options that are more viable thank expected .

Oct 14, 2018 9:26:03 GMT carat 3.6 said:

If we are talking about your sportline 320, you don't need to replace any of the things you mentioned. The only thing that you might want to change is the diff, as the 4 speed likes a high ratio.

For the 722.6 conversion you need the gearbox from a early w210 e320, this is an m104 so a direct swap. You then need the aftermarket controller to make it work though.

That is interesting. Cheers for clearing that up.

I only thought the above as a mate of mine rewired @dicksdasterdley's now sold E280 5 speed (bad engine wiring harness). On that car, he noted the wiring was subtley difference to a 4 speed car, and that the ECUs differed from what he had previously seen on 4 speed cars.

The diff is one thing I forgot about. I take it that is down to the 4th gear in both 'boxs having a 1:1 ratio, hence the benefit of a taller diff in a 4 speed?

I take it with the earlier 'box the prop will still fit from a 5 speed W124?

I ask this question for future purposes . While the 722.6 does add expense it does look like alot of benefits can come about from it.

Both boxes have the 1-1 4th gear, but the 5 speed having an overdrive 5th uses a 3.65 diff. The 4 speed is 3.07. The prop shaft is the same for both.

There are differing engine looms for cars with/without cruise control, ASR, ASD, but it doesn't affect the gearbox. The 4 speed only has wires for the reverse switch and starter inhibitor. The 5 speed has the same, and also the wiring and controller for 5th gear.