Lifetime Supporting Member
Join Date: Jul 2018
Location: Southern Illinois
Feedback Score: 0 reviews
Historically the stock in dash gauge (no after market gauges installed) has rarely ever moved from dead center. After the initial rebuild the only time it went up was long trips at higher mph (usually when carrying ATV in bed). Since the second rebuild earlier this year, I have seen the gauge climb more frequently after driving for about 45 min and when in slower traffic. I have not noticed any slipping or other issues and have not thrown any codes. For perspective, I do live in Florida and the temps have been in the mid to upper 90s lately.
Welcome to the forum. I too had a by-pass that I had to rebuild (discovered while following Marks’ write up for 4R100 Flush/Fill). With the lines apart I blew low pressure air (10psi) through the supply line, OTW cooler in the radiator, stock OTA cooler, and out return to be sure there were no blockages (advice from this group). With no problems found, then replaced OTA cooler with the Mishimoto 6.0/7.3 cooler, and added a A/T Temperature Gauge. I don’t believe I would rely on the in dash gauge for any degree of accuracy. Also, those assumed A/T temps do not seem normal even with ambient temps in the upper 90’s. I’ve seen no increase of over 160* driving 4 hours in the same temps as you mention with a light tow. I’m sure more experienced members will be along shortly with some advice. Good Luck.
2002 F350 7.3L / 4R100 - 4WD CC DRW 8’ Box, AIH Delete, Gauges- Pyro, Trans Temp, Boost, Fuel Pressure, TS-6 tuner, Zoodad Mod, Mishimoto 31 row Trans cooler, Mobil 1 ATF, Trans return line ATF filter, Hutch/Harpoon Mod, Air Lift Load Lifter 5000 rear air springs, Rancho 9000 shocks, Timbrens on the front.