Noob with differential swap question.
Great site! Ok, I boosted my '75 240D 4speed. Now, I run out of gears way too early. I saw on adsitco that the 123 chassis axleshaft has the same P/N. So, does this mean that the differential out of a 123 chassis 300TD 3.07 or 2.88 ratio would swap in? I don't mind playing around with parts, and I won't sell it, so it doesn't matter to me if it stays stock. I've got the 3.92 in it now and the fastest I feel safe with the engine is 80mph. I'd really like the benefits of a taller gear for better top speed and better mileage. Power is no problem.
Thank you, Scott