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190E 2.6 Automatic
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16 Posts
Discussion Starter #1 (Edited)
2.6 2.3 Tranny swap

Hi!

My 1992 190E 2.6 tranny (722.409) is acting up (reverse can take up to 1 min when car is not cold, 2->3 hard shifts).

I have a 1992 190E 2.3 donor car (722.4xx).

From my searches on the forums here, the trannies are bolt on compatible. I also need to change the torque converter.

I was told by a tranny specialist that the 2.3 tranny clutches are smaller and would end up breaking in my 2.6. Is that BS?

Is there anything else that needs a heads up?

If you did a swap, share your story please :)

Thanks
 

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1989 190E 2.6
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715 Posts
If you don't need the car as a daily driver I'd probably just convert to a 5 spd, unless ofcourse you do mostly city driving or just like automatic better. Sorry I don't have much else to add. The 2.6 makes like 158 hp and the 2.3 is around 130 I believe so idk if 28 hp would be enough to do anything to the 2.3 tranny. I also know the 2.6 has 168 ft/lbs of torque but idk what the 2.3 is. Good luck, hope some of that was kinda useful.
 

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190E 2.6 Automatic
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Discussion Starter #5
Update for archival/search.

I finally swapped my tranny, a 722.409 for a 722.408. They are perfectly compatible, nothing was needed.

The only difference I notice is that gears change at a different time (ratios are different). My rpm is now lower at higher speeds (100km/h @ 2500RPM compared to 3000RPM before). From preliminary testing, my fuel consumption went from 14L/100km to 10L/100km, but I also realigned the car, replaced front tie rods and steering damper.
 

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'87 190E 2.3 Manual, '81 500SEL 4whl SLS, '91 300SEL
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1,757 Posts
Update for archival/search.

I finally swapped my tranny, a 722.409 for a 722.408. They are perfectly compatible, nothing was needed.

The only difference I notice is that gears change at a different time (ratios are different). My rpm is now lower at higher speeds (100km/h @ 2500RPM compared to 3000RPM before). From preliminary testing, my fuel consumption went from 14L/100km to 10L/100km, but I also realigned the car, replaced front tie rods and steering damper.
Hi Phil,

Did you do the transmission swap yourself? If so, how bad was it to unbolt the trans from the engine? I'm at that step (everything else unbolted) with a second 190 I bought, and I'm trying to figure out the best way to do it.

I also find it interesting that the gear ratios changed, I had no idea that there was a difference. Does the car shift after the max gear speed indicators on the speedometer?

Thanks,

Denis
 

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190E 2.6 Automatic
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16 Posts
Discussion Starter #7
Hi Phil,

Did you do the transmission swap yourself? If so, how bad was it to unbolt the trans from the engine? I'm at that step (everything else unbolted) with a second 190 I bought, and I'm trying to figure out the best way to do it.

I also find it interesting that the gear ratios changed, I had no idea that there was a difference. Does the car shift after the max gear speed indicators on the speedometer?

Thanks,

Denis
I did it in a garage. The car was on a lift. Some of the upper bolts were a pain to access, so we tilted the engine by pushing it up at the front. Nothing special, just make sure you have an extra pair of hand or something to hold the tranny when bolts are loose.

As for the changes in shifts, it doesn't reach the red. Shifts from 1->2 sometimes occur at a higher rpm (3.5k) when barely accelerating. Else it is barely noticeable when driving normally.
 

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1993 mercedes benz 190e 2.6L (parts car) 93 2.3 manual swap
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24 Posts
the transmissions are different. sorry to say but that tranny is not made for that power. the clutches are not smaller but there are fewer of them. the 2.6 engines power is too great for that one. you are going to cuase premature wear on the clutches becuase they will slip more before engaging into gear.

my suggestion is rebuild your 2.6 tranny while that one is in, or save up for a manual swap. good luck!
 

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190E 2.6 Automatic
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Discussion Starter #9
the transmissions are different. sorry to say but that tranny is not made for that power. the clutches are not smaller but there are fewer of them. the 2.6 engines power is too great for that one. you are going to cuase premature wear on the clutches becuase they will slip more before engaging into gear.

my suggestion is rebuild your 2.6 tranny while that one is in, or save up for a manual swap. good luck!
I know there are 4 plates instead of 5 in the new tranny since it came from a 2.3.
After talking with a few mechs, it could cause a problem in the long run, but shouldn't. The power difference between the 2 models is not that big, and the 20years of use definitely lowered it. It was definitely worth it in my case.

I'll update this thread every few months for those wondering. It's already been a month and everything is perfect.
 

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'87 190E 2.3 Manual, '81 500SEL 4whl SLS, '91 300SEL
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I did it in a garage. The car was on a lift. Some of the upper bolts were a pain to access, so we tilted the engine by pushing it up at the front. Nothing special, just make sure you have an extra pair of hand or something to hold the tranny when bolts are loose.

As for the changes in shifts, it doesn't reach the red. Shifts from 1->2 sometimes occur at a higher rpm (3.5k) when barely accelerating. Else it is barely noticeable when driving normally.
Okay, I'm doing the same thing. My buddy and I are probably going to finish the swap up next weekend. I pulled a trans from a 2.6 in the yard, but I was lucky enough to have 'em rip the whole engine + trans from the car with a wrecker. We only have jacks and jackstands though, our hydraulic lift out back isn't working the whole way. Thanks for responding!

Also, I imagine it's not shifting at as high of an RPM because the 2.3 only goes to 6k before the redline. I think the 2.6 hits at 62-6300, or at least the M103 in our 300 SEL does.
 
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