I've never been a fan of integrated trans coolers. IMHO, they should be separate.

If you do decide to add a separate cooler, you must be very careful to make sure it has enough surface area as well as sufficient air flow.

I discussed this with a mechanic once, in regards to my old school bus. One thing he pointed out is that the coolant in the radiator keeps the trans fluid from overcooling, which could be an issue in very cold climates.

I don't really know, but those are things definitely worth considering.

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-tp


1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition