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Old 03-29-2007, 12:08 AM
Registered User
Join Date: Jun 2005
Posts: 17
M103 2.6 to 3.0 swap

I'm considering finding good used engine for my 91 W124 2.6.

Seeing as there appear to be more 3 liters available and assuming that the trans would have swap with it, is swapping 3.0 and trans into the car easily done? Body and interior are solid 8's.....

If I'm gonna do all that work and spend the money (which is still an IF at this point), at least I'd have more torque to show for it........

Comments please??

Marc G.

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Old 03-29-2007, 06:25 AM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 38,594
i think maybe the rear end ratio is different, so if you dont change that you will get significantly worse gas mileage. great acceleration though.

as it is the 3.0 gets about the same mileage as the 2.6 because it carries the higher ratio.

not 100% sure but pretty sure this is the case.

tom w
[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.
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Old 03-29-2007, 10:55 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
it's an easy change the trans as get a 722.3 instead of a 722.4 you will need the f.i. computer i believe.i did this in a 201 body and it was a little more tricky but still easy.

David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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