Anyone know if a '91 420SEL diffy will bolt up to a '91 300SE chassis?
I know the ratios are hugely different, 2.47 vs 3.46, but that's the
mad project I have in mind.

Tks,
DG

I can't imagine why it would not fit. Same chassis.

But, it sure will be interesting to see that 300 push the W126 with a 2.47 installed.

Better wire the hazards permanently ON.

Did you figure a way to get it to start in 1st??

Yep, you're getting the wild idea. I'm sooo tired of doing 3500 at 70.
Fix it to start in 1st gear, gain 15% torque over the current 2nd gear start, cruise at 2500 in 4th instead of 3500. No hills in Texas.
I've been chewing up gas, and all the belt-driven accessories for so long, I'm gonna try this. Maybe. Found a diffy on ebay for $99, just might take a chance and bolt it in, see what happens.

DG

I'm very curious to see how it does. I'm really wondering if you can get 25 mpg on the highway? The diesels do a bit better than this, but, the cost of diesel fuel offsets the benefit.

How are you going to get the first gear start??

They all should bolt up. A W126 is a W126. I can't think of a reason why it wouldn't be a direct swap.

After you do it please post 0-60 times and MPG figures. It would be very interesting to see the results.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200

that the acceleration will be a bit leasurely but it will be fine. and i think mid twenties will be possible if you dont drive too fast. say, 75.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.