'70 300SEL conversion - Page 2 - Mercedes-Benz Forum

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post #11 of 28 (permalink) Old 05-28-2010, 12:53 PM
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Ive got a 66 250S six with a manual trans that I was thinking of dropping a 4.5 and trans into. Found a donor car for $500 with an engine than runs as long as the starting fluid is in the cylinders...

I would love to boost the HP while I'm at it. Did anybody make headers for the engine/model?

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post #12 of 28 (permalink) Old 05-28-2010, 01:00 PM
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post #13 of 28 (permalink) Old 05-28-2010, 01:14 PM
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[QUOTE=Uhlenhaut;4168122]Just drop a 6.3 in there like Jay Leno

Oh Hell yea! cept, you think he paid more the $500 for it... LOL

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post #14 of 28 (permalink) Old 05-28-2010, 01:39 PM
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So Jay's going to have a spare engine laying around, hhhmmmm. Later.

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post #15 of 28 (permalink) Old 07-04-2010, 02:14 AM Thread Starter
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OK, so I found the engine I like. While I've been offered an older Ford V8, I'm looking at the 5.4L engine and 5 speed auto tranny out of a recent F150. I espeially like the lightning option (and the 380hp it delivers!).

While I'm amenable to a modern Mercedes transplant, I can find an entire donor Ford for the price of a Benz engine and tranny.

I'm most interested in getting the engine, plus ECU, plus harness and all associated extras in one package.

I'm assuming the project will start in about 6 months, and end with my current 108 being scrapped or sold for parts after I take out the interior.

Something I'm wondering about though is which rear end to keep. My 108's 4.5 screams at highway speeds, and I've got no memories of the 3.5 whatsoever. For the lowest revs, which one should I keep?
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post #16 of 28 (permalink) Old 07-04-2010, 07:10 AM
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If your 4.5 is original it's got a 3.23 or 3.27 rear ratio. It shouldn't scream that much. 3.5s came with 3.46 or 3.69 usually, so it would scream even more. You should try to source a 6.3 rear axle: 2.82 or 2.85, especially that you have air suspension.

BTW, do you keep the air suspension? If not, and given that you go with an american engine, you can just go for american iron live axle: cheaper, simpler and plenty around.
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post #17 of 28 (permalink) Old 07-04-2010, 05:20 PM
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Onw warning: If you do go much higher in power, the differential will overheat.

Near Manassas Va. '65 220S, 2006 Ford Crown Victoria Police Interceptor, '99 Volvo V70, '72 350SL 4 speed

Not part of the in-crowd since 1952. It's BRAKES not breaks. You break a bone, use brakes to stop your car. /rant

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post #18 of 28 (permalink) Old 07-05-2010, 01:50 AM Thread Starter
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Originally Posted by GGR View Post
If your 4.5 is original it's got a 3.23 or 3.27 rear ratio. It shouldn't scream that much. 3.5s came with 3.46 or 3.69 usually, so it would scream even more. You should try to source a 6.3 rear axle: 2.82 or 2.85, especially that you have air suspension.

BTW, do you keep the air suspension? If not, and given that you go with an american engine, you can just go for american iron live axle: cheaper, simpler and plenty around.

Gear ratio - are there markings on the casing that would tell me what the ratio is?

Regarding air suspension - it was taken out years ago. My dad got tired of chasing down leaks, even after replacing the bellows and seals. The suspension came out of a 108 and bolted right in (sort of turns the 109 back into a 108).

I had thought about using a live axel, and while I'm reasonably good with a welder, I'm crap at fabricating. I'd have to do a lot of custom work, or have it done. I'd rather do it myself or with my dad. I'd also have to have a perfect match in terms of width. If there's another Mercedes option with a better ratio that I can bolt in, I'm happy with that.

How much are rear ends out of a 6.3? And where on earth would I find the things?
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post #19 of 28 (permalink) Old 07-05-2010, 01:53 AM Thread Starter
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Onw warning: If you do go much higher in power, the differential will overheat.
This throws me for a loop - how so? Speed is speed, regardless of power. I've got a relatively light foot most of the time so I'm not worried about breaking gears...
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post #20 of 28 (permalink) Old 07-05-2010, 05:22 AM
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The gear ratios are marked on a machined area at the bottom left side of the center case.

If the car was converted to springs, then your father may have also replaced the rear axle especially if the original one didn't have the necessary bracket to accomodate the center spring.

6.3 rear axles are not that common, and aren't that cheap either. Most need rebuilt due to age and the torque of the 6.3. Much more expensive than transferring the trail arm brackets on a US live axle.
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