Our 1980 TD had a turbo motor installed, by the previous owner. No idea about the transmission or the rear gears

It seems to me to run at higher RPM and I am thinking that the rear end and maybe the transmission might be from the original non-turbo wagon.

Being that I have an extra SD rear end and transmission should I do a swap?

Open for suggestions

Thanks
Don

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1980 300TD-T (82 Turbo and Trans) 159,000 Miles "Jackie-O"
1983 300SD 272,000 Miles "Aristotle"
1987 Jeep Wagoneer Limited - keeps the MB's off the ice and out of the snow
1994 BMW 530it

I was curious about this same thing the other day...so, I crawled under leathermang's non-turbo parts wagon (dunno what year 79-80???) and it has what appears to be a 3.56:1 drive ratio. In comparison, my 1983 300TD has a 3.07:1 ratio.

I'd go for the swap if at all possible...for reference, my cars both turn about 3100rpm @ 70mph.

But, I don't know if those pumpkins are interchangeable...the one on Greg's parts car has a finned rear cover that looks different from the ones on my wagon and sedan (which, BTW is also a 3.07:1).

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Never a dull moment at Berry Hill Farm.