I need a little help. I let my father-in-law borrow my truck (2000 F350, 4x4
Auto)to get a load of gravel today. When he got back he said the transmission felt like it went into neutral while driving. I have a PHP 6-position chip on the truck and put it in the towing position before he left. He said he was driving with the OD
turned off and while cruising at about 55 mph the truck stopped pulling, he said he gave it a little gas and the rpms just went up like it was in neutral? He then coasted to the side of the road and put the truck in park to see if it was loosing any fluid and there was none. I asked if the tranny got hot and he said he never saw it over 180*. He hopped back in and put it back in drive and it acted normal. He drove another 7 or 8 miles, he still had the OD
turned off with the cruise control set at about 55 or 60 while drive up a incline the cruise kicked off? He said he thought it was doing it again, but when he got back in the throttle it acted normal.
I have had this truck for about 3 years. I have never had any issues with the tranny. The truck has about 178K on it. This is however the first time the tow tune for the chip has ever been used. It has only been on the truck for about 4 months and this has been the first time the truck has been used to haul something since the install. I asked him if he noticed if the OD
light was flashing and he said he did not see it if it was? Could this be a tune problem or is something failing in the transmission? The truck had about 3000 lbs of gravel in the bed and the only mods are induction, exhaust, gauges, and PHP 6-position chip. Thanks for any help guys!