In the last 3k miles I replaced both the starter and alternator in my 1985 240DL. Last weekend I picked up a 1991 240 to replace the old girl. The question is, both the starter and alternator have lifetime warranties, so can I/do I swap them into the newer volvo. The newer volvo works just fine, but at 170k miles, the original alt/starter could be ready to go at any point.

So are they the same part or not?
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85 240DL 189k; 91 240 169k

FWIW my alternator went at 235,000 miles, the starter is still working fine at 315,000 miles.
I'd wait and keep them as spares.

Well I am about to try and sell the older volvo. I don't have the room to keep a parts car around. So I wanted to salvage the newer parts off of it ahead of time.
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85 240DL 189k; 91 240 169k

World Pac shows that the 5003804 alternator fits 85-93 and the 5003564 starter is the same, 85-93.

Mark

Here's a great source for checking parts interchangability between different years and versions of 240's:
www.fcpgroton.com

They're also a fine source for parts.
I live in the same town.
Real people behind a counter who have brains between their ears.