Can anybody tell me how long could I run my stock 6.7 with a stage 3 68rfe without messing something up?????
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Those of us in the transmission industry get this question a lot. The answer won't be simple lol.
If you want it to last as long as possible, stay on top of the maintenance schedule - change the fluid and filters and periodically check fluid level. That's the first important step. I don't care who built the trans, how many billet parts are in it, or what the warranty is. Neglect maintenance and you'll destroy the transmission. Doesn't matter if the truck is at 280hp or 1280.
Assuming the maintenance schedule is followed, you'll want a transmission temp gauge on the truck. Pay attention to it. 68RFE's, depending on location, driving conditions and time of year, will run 140-210 degrees. The cooler you can keep the fluid (within reason), the longer your transmission will last.
If you want to destroy the transmission, don't follow the maintenance schedule, make the truck have axle wrap/wheel hop and potentially break the case, run it low on transmission fluid, or make more power than what that stage can hold.