Is running -6 coolant lines sufficient or would you go with -8?

 

Coolant lines and coolers are typically 3/8" which is the inside diameter of AN-6 lines.
I would recommend Teflon lines, partly because the fittings are smaller (less likely to get in the way), and the outside diameter of the lines is much less, making them easier to route. Plus Teflon lines can handle higher pressure and are chemically more resistant.

 

Planning on running these

http://www.sweetperformance.com/prod...&productId=496

With fittings to this

http://www.jegs.com/i/Derale/259/132...27#moreDetails

 

I am running -6an on my 4l80e with 90* fittings with SSB teflon lines. when you look at the size of stock cooler hard lines you pretty much know then and there that the -6 is plenty IMHO

 

I'd run a bar/plate cooler if possible.

 

I ordered the same tranny cooler fittings from Sweetperformance and they just came in the mail Saturday, looked like nice pieces. I also ordered 6AN braided stainless hose and fittings from Jegs.For a cooler I went with the B&M stacked plate cooler with built on cooling fan. Getting ready to do my
4l85e & FTI converter install in the next couple of weeks.

 

Would like to run a plate type with fan but running out of room. Was thinking the Derale posted above mounted under the car would work good as it will have plenty of air moving through it while driving.

 

I don't know this for a fact, but I suspect that stop-and-go driving will generate a lot of trans heat, especially with a high stall converter, and you then have little air flow under the car.

What kind of car do you have? I'm sure you will then get more precise suggestions.

 

It is 66 Nova.

I can probably get away with mounting this flat under the car but would be afraid of road debris hitting the fan. Will check inside wheel wells

http://www.summitracing.com/parts/bmm-70297

 

I suspect your 66 Nova has a huge radiator like my '81 Camaro.
I bought a large cooler with pipe fittings (no barbs!) from O'Reilley auto for about $60. I used AN converters from the pipe fittings to AN6.
The cooler is mounter well in front of the radiator, as I have low-profile twin electrical cooling fans mounted to the front of the aluminum radiator.
These old cars have a lot of wasted space to play with.

 

No room up front due to IC and A/C condensor.

How important is to have a fan on a bar and plate type cooler mounted under the car?

 

Do I need to some how run a thermostat that will open and allow the fluid to run through the cooler at a set temp or just have it always running through the cooler?

I ordered the B&M but without the fan. I don't do a lot of stop and go driving so should always have air flow running through the cooler under the car.

 

Let it flow all the time.