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2005 W220 S500 4Matic / 2008 W211 E350 4Matic
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Discussion Starter #1
I have grown less fond of the differential in my 300SE with every highway mile. The drone of the engine at or over 75mph isn't so bad, but it seems to me that keeping the car at higher revs for long periods would be worse for the car than keeping it at lower rpms for the same amount of time. That said, does the differential from one of the V8 sedans swap into a 300SE with no mods? If it does, and the job is not too awful, I'd entertain the thought of trading differentials with another memebr in the Northeast if anyone is looking for a 300SE rear end unit. I'd prefer the cruising RPM drop, and can deal with the loss of acceleration that would accompany. The V8 user who traded with me would lose top end speed, but would gain significantly in acceleration. So, before I get ahead of myself, is there a good reason not to do this, such as that it won't work?

By the way, my differential is in great shape, fresh fluid, no leaks, no noises, runs cool, etc. I just want a better ratio - I'm not thinking of ditching a broken unit on some poor sap!
 

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One Smoke Silver '87 570SEC, one Black Pearl '87 560SEL
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I have a spare 2.47:1 differential out of my 560SEC that might help you. It won't help acceleration at all but it will drop the revs on the highway.

Give me a call - (702) 494-8056
 

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2005 W220 S500 4Matic / 2008 W211 E350 4Matic
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Discussion Starter #3
Interesting! I'd be a bit scared of mailing it from Vegas to Boston though - any idea on the weight of it?
 

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89 560 SEC
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What is the ratio of the rear end in your 90 300 SE is it open or limited slip?
 

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2005 W220 S500 4Matic / 2008 W211 E350 4Matic
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Discussion Starter #5
I don't know the ratio, but I am certain that it is NOT limited slip!
 

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You cannot swap a differential from a 300SE into a V8 w126 without swapping over driveshafts....the driveshafts are different. And the driveshafts are usually expensive.

You'll find that any stock V8 diff will make your car unbearably slow at low speeds...stock US diffs are 2.24 on the 500's and 2.47 on the 560's....the diff on your 300 is a 3.46....so it's almost a 30% drop.


talbir
 

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1990 Mecedes-Benz 420SEL
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I second Talbir's response. The 300SE inline six loves to rev... don't worry about it. If you had a lower ratio, your car would be a SLUG!!

Dave
 

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One Smoke Silver '87 570SEC, one Black Pearl '87 560SEL
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300se126 said:
Interesting! I'd be a bit scared of mailing it from Vegas to Boston though - any idea on the weight of it?
It weighs 95 pounds and I have a shipping box (plywood assembled with BUNCH of sheet rock screws) that it's sitting in. I can get you a driveshaft as well if it's needed.

If you want it, we can do it easily. This differential was in my SEC with 200K miles. It had no problems when I removed it to replace it with a 3.07 LSD.
 

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2005 W220 S500 4Matic / 2008 W211 E350 4Matic
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Discussion Starter #9
Mramay, thanks for your offer, but after listening to the responses here, I think it probably isn't worth it. Should I magically discover proper funding for a twin-turbo rig, that would change things, but for now I doubt a 30% decrease in power would suit me. I think the M103 is powerful enough for this car, but drop it that much and it would be getting down into Scion power levels, and with a car this big, I doubt it would be useful - plus I'd be reaching for the kickdown left and right and probably sucking down gas like there's no tomorrow. So, I guess that mod goes back to the drawing board. Perhaps a better solution would be a switchable ratio diff, but that would probably wander into twin-turbo price territory anyway. Oh well. Thanks for all of the input, guys.
 
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