Advise Needed

[Randy820]

I have had my 99' 350 for almost 2 years. It is stock except for an AirRaid breather and an older Powerchip tuner. I just bought a travel trailer that will weigh in at 12500 lbs. I plan to add a V10 cooler to the tranny and gauges on the piller. I also want to upgrade my tuner and the muffler may fall off.

Questions: Should I consider synthetic engine and tranny oils? Are the synthetics worth the expense? If so, what are your recommendations?

[layson]

You ought to look into the 6.0 transmission cooler. It is a lot larger the the V10 one. In fact you can take the V10 one and the stock one and you almost have the same size cooler...

[Highbeam]

Precisely what he said, to add the V-10 cooler. As in add it to the stock one and run them both? This is commonly known as a true-cool aux cooler added in series with the stock cooler and works great. If you're going to the trouble to replace the stock cooler with the V-10 cooler then I would reconsider this approach and either add a tru-cool in series or go for the expensive 6.0 cooler. Our trucks need more trans cooling than Ford gave them.

[Grease Monkey]

If you do go full synthetic you can never go back to anything less than a synthetic blend!!!!!!!!

I would keep running delo or good regular oil in the motor, trans required fluid, diffs & trans case I would go synthetic tho. It does help keep them a little cooler and cleaner and the oil will stay cleaner longer in there as well....

I would think about a full turbo back for best results with the chip upgrade as well... You might experience some surge with that big of a load as well, look into either a wicked wheel or ported compressor housing..... If keeping the stock turbo...

Also like mentioned above the bigger tranny most efficient cooler you can get the better!!!! Your trans will be happier towing, especially up grades