The remote filter head unit is a Ford type 3/4 -16 unit. Any time a transmission is serviced, it is essential to flush. Start the vehicle (or have your helper do it) and then start adding transmission fluid through the funnel. Once you start the vehicle it will start pumping the transmission fluid out into the 5 gallon bucket. The filters I use are Fram PH4825 (Large) or the Fram PH2872 (Small), neither have an anti-drainback valve or bypass valve. ATP AT-200 Cooler Flush is a professional grade transmission cooler flush. Open the case of transmission fluid and remove the caps from all of the transmission fluid. There was more pressure difference through the remote oil cooler. My testing years ago when I first tried these filters showed less than a 2 psi pressure difference before and after the oil filter. Most oil filters have this anti -drain back valve, the oil filters I use do not have this valve nor do they have a bypass valve (the bypass valve opens above a certain pressure if the filter gets clogged, however they also open when the trans oil is cold or when cooler line pressure is high allowing unfiltered oil back into the lube circuit). A friend of mine has had the the same setup on his 1500hp turbo combo with a Coan Big Dog TH400- 5years and no issues.I have scores of customers using these remote filters over the past 5 years,none of them have had a problem.Īs I stressed in my post, you MUST use a filter that does not have an anti-drain back valve, this is a rubber flap valve that is spring loaded and takes a certain amount of pressure to push open- this is what causes the increase in converter pressure. I have the same setup in my turbo combo, no problems whatsoever. My th400 internals came out like the day I put them in. I ran my previous race car combo for years with a remote oil filter setup, 7000 rpm shifts, 1.34 sixty foots, never had a problem with it.

Transmission cooler flush