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  #1  
Old 04-03-2015, 02:58 PM
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Those of you who have done a cross platform/brand swap..

What have you done for a rear end/ driveshaft?

I'll be putting a SBC into a w124, and the last thing to figure out is what to do about the driveshaft/rear end. It looks like the 300Es rear end is pretty stout, though I dont know if I trust the rubber isolators in the driveshaft. This motor will be around 350chp/425ftlbs tq. Do I trust the vette rear end and find a way to make the axles work?
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  #2  
Old 04-03-2015, 03:24 PM
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When you say rubber isolators are you talking about the driveshaft flex disk? If yes, they should be ok.
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  #3  
Old 04-03-2015, 04:25 PM
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Someone on this site used a diff yoke from a Dodge 8 1/4" , they just had to remove the slinger ring and cut the nub from the Mercedes diff. MB makes something like 5 different diffs so you will have to confirm. They are designated by ring gear size and oil capacity.

Also have a look at a place called "the drive shaft shop" They are making aluminum discs that will allow you to use a Ford bolt on style drive shaft. They didn't show a direct replacement for MB but they do make them for BMW , Caddy CTS , and a few other cars.

If you are using a slip yoke on the trans, you probably can delete the center bearing and use a one piece shaft but check clearances first.
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  #4  
Old 04-03-2015, 06:59 PM
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I actually found a place locally that will take driveshaft a and driveshaft b, cut the necessary ends off of each and mount them on an aluminum tube shaft, balance the whole deal for $2-300. They actually judt called me back from last week so the timing was perfect.
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Old 04-03-2015, 07:49 PM
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Price sounds about right. On a side note did you know that the newest Camaros utilize flex disc?
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  #6  
Old 04-04-2015, 05:46 AM
Knappy Drag Racer
 
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You didn't state which 300E you have or what year. The M104/M119 powered W124s have a 8 1/4" (210 mm) rear which is indeed stout enough, but the M103 powered 300Es only have a 7 1/4" (185 mm) rear which is not stout enough. In America, a 92 300E is still a M103 car, but a 93 300E is a M104 car. Same name, same look, totally different powertrain under the skin, except for the trans. Then there are the 93 2.8 liter M104 powered 300Es. I don't know which rear-end those have.
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89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.
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  #7  
Old 04-04-2015, 09:58 AM
Knappy Drag Racer
 
Join Date: Jun 2008
Posts: 1,725
I just saw your sway bar thread and in there you said it's a 93.

OK, I hope you appreciate this cause it took me FOREVER to relocate these links. Dave's (gsxr) site is wonderfully informative, but it's also hard as Hell to navigate.

http://www.w124performance.com/docs/mb/other/differentials.pdf
Index of /images/W124_diffs

According to the info there, the 2.8 powered 300Es had the 210 mm diff too so it appears you lucked out and are golden.
__________________
89 300E "Benzer1" 15.924 Uncorrected
93 400E "Benzer3" 14.200 U.C.
95 E420 "Benzer4"
92 300E "Benzer5" 16.299 U.C. Future turbo CNG
87 300D "Benzer7"
87 300D "Benzer8"
87 300D "Benzer9"
87 300D/70 AMC Javelin "Sidewinder-Benzer"
87 300TD "Benzer11"
06 E320 CDI "Benzer12"
05 E320 CDI "Benzer12A"
71 AMC Javelin AMX 401 "Sidewinder"
74 AMC Hornet 401 "C.K.10" 13.63 U.C.
74 Bricklin SV1 "Presto" AMC 360 pwrd.
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  #8  
Old 04-04-2015, 04:27 PM
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Quote:
Originally Posted by engatwork View Post
Price sounds about right. On a side note did you know that the newest Camaros utilize flex disc?
Yep, along with a handful of Chrysler products.

Quote:
Originally Posted by 400Eric View Post
You didn't state which 300E you have or what year. The M104/M119 powered W124s have a 8 1/4" (210 mm) rear which is indeed stout enough, but the M103 powered 300Es only have a 7 1/4" (185 mm) rear which is not stout enough. In America, a 92 300E is still a M103 car, but a 93 300E is a M104 car. Same name, same look, totally different powertrain under the skin, except for the trans. Then there are the 93 2.8 liter M104 powered 300Es. I don't know which rear-end those have.

Quote:
Originally Posted by 400Eric View Post
I just saw your sway bar thread and in there you said it's a 93.

OK, I hope you appreciate this cause it took me FOREVER to relocate these links. Dave's (gsxr) site is wonderfully informative, but it's also hard as Hell to navigate.

http://www.w124performance.com/docs/mb/other/differentials.pdf
Index of /images/W124_diffs

According to the info there, the 2.8 powered 300Es had the 210 mm diff too so it appears you lucked out and are golden.
I apologize for not providing more information, I was posting from my phone and was admittedly lazy in doing so. My car is infact a 93, It is also a 3.2L m104, as opposed to the 2.8. I absolutely appreciate the information. I've been there (to the site) before and made it about two clicks from my brain frying before leaving.

That's a relief.

Hopefully this swap goes as smoothly as I imagine it is going to.
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