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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

tire size/gear ratio

 
  #16  
Old 09-19-2018, 07:29 AM
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The OP asked what was safe for trans temp, that's why I said 220, yes it can get hotter than that for a short period of time and not hurt anything, but you don't want it constantly above 220.
 
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Old 09-19-2018, 08:59 AM
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Originally Posted by arse_sidewards View Post
250 on down is fine for a transmission that's working hard so long as you kinda sorta change the fluid on time. Don't worry about the occasional spike to 280 while pulling a hill.
If you saw 280F @ the test port,the temp of the fluid coming out of the converter would be well over 300F.Possibly close to 350F or something insane.Your converter would probably be glowing lol.There's simply no need whatsoever to let an auto trans get so hot.Remember perfect trans temps are 175F @ the test port.Anything over and under are less than perfect.30-40F either way may still be safe sure but less than ideal.

I run the tru-cool LPD4739 with the thermal bypasses in my trucks and trans temps run around 180F @ the test port the vast majority of the time,with an occasional 10-15 degrees over once in a blue moon.A good aux cooler is pretty cheap insurance for a multi thousand dollar trans.
 

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