I installed the B&M 70269 trans cooler but I forgot to pay much attention to which line I hooked to the top/bottom, does the location of the supply/return lines make a difference?
http://www.summitracing.com/parts/bmm-70268

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-05 Dark Khaki Limited CRD. GDE ECO tune. In-tank lift pump, Transgo doo doo kit, B&M trans cooler, replaced trans solenoid pack and filters, Newer Michelin tires, Timing belt with all related parts replaced at 110,000miles.

I don't know that it makes much difference. 2 of the 3 tranny cooler posts I've saved don't mention anything and topan's (viewtopic.php?f=5&t=62013&p=686385&hilit=cooler#p686385) says he did it one way mainly because he thought it would work better.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Thats what I was thinking, thanks papaindigo!

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-05 Dark Khaki Limited CRD. GDE ECO tune. In-tank lift pump, Transgo doo doo kit, B&M trans cooler, replaced trans solenoid pack and filters, Newer Michelin tires, Timing belt with all related parts replaced at 110,000miles.

From what I know, it shouldn't. It may be easier to fill up the cooler with pressure line charging from top. It all depends on how your cooler is positioned and what type of cooler you have, your cooler may have the "smart" cooling lines (first lines are straight - like a straight pipe, then next start having a zig-zag), meaning the flow would increase as the fluid temp increases, like when cold, fluid will pass through one or two lines in the cooler, and as fluid temperature increases and becomes more fluid, will get through all the cooler, in which case it won't matter how you connect your lines too much as you'll fill it up anyways at some point as your tranny fluid temp increases (in this case make sure you check your fluid level when the tranny temp is high - a gauge in tranny pan would help). I dont remember which line is pressure but fsm should tell you. Keep in mind the 545rfe has a thermal bypass and fluid won't go through your cooler till it reaches some temperature, from my own observation that bypass opens at 130-ish degrees. Couldn't find this info exactly anywhere, if somebody knows, ill appreciate the info.

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.

To add to my comments for what it's worth I suspect that if it matters for a particular brand/model of tranny cooler that the install instructions would say so and/or the in/out pipes would be marked.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

Thanks guys, and yeah you would think that if there is an "IN/OUT" port on the cooler then it would have arrows showing flow on the connections.

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-05 Dark Khaki Limited CRD. GDE ECO tune. In-tank lift pump, Transgo doo doo kit, B&M trans cooler, replaced trans solenoid pack and filters, Newer Michelin tires, Timing belt with all related parts replaced at 110,000miles.

I think your cooler doesn't care which way you install them. Regardless, b&m is a very good brand.

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2005 kj CRD, samco, suncoast tc, provent, Kennedy lift pump, GDE ECO full torque, 2nd gen filter head, 245/70/16 a/t tires, mopar light bar, fumoto oil valve, OEM Skid Plates, ARB Front bumper and HD OME, tru cool LPD47391 40k GVW tranny cooler (stock cooler delete), FF Dynamics e-fan and shroud, rocker arms replaced, HDS2 190F thermostat.