Just purchased a ride and ran it this past weekend and I noticed the transmission was running extremely hot. It has a cooler with a fan on it but it seemed after the first pass it would never cool down. What causes this? What can be done to help it? Its a mild big block in a light car footbraking 1.80 powerglide with a 8 inch converter. Thanks
Does it have a "Ringless" input shaft? If that may be your problem. That is a common problem with them.
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Look the lines over real good also. I had one that had a little kink in, trans tunnel hit it and I couldn't tell until after the tunnel was installed, and I had a hard time with heat. Now that I found that I double enter and zero problems with heat. There are many other things it could be. A spragless converter will build more heat also.
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most of the heat in a trans.is from the converter. just a guess but I would check and see how loose your converter is. also too tall a rear end gear will cause the converter to slip and never lock up.
What kind of heat are you talking about temp wise?
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looked like it ran pretty good---after you got some gloves
Check fluid level. The level should not be over the full mark when the trans is HOT! Should be on the add a pint mark if running a factory style dip stick. If that isn't your issue, then sounds like it might be a good time to take it out for a check up.
You could call Bob and look into one of his pumps. That if there are no other issues.
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Make sure the fluid is fresh and that the cooler has plenty of air flow through it. Fluid level is important too but recently I have spotted a lot of sticks being off a bit. Not sure why either. Pull the pan off and check where the stick is actually at, on a glide I mark it right at the pan rail.
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Where is the sensor?
After I have installed diaper on my car the trans gage got super hot. Moved the sensor and back to normal. Where the sensor on line was before it was trapped underneath and gave false readings.
How hot is hot ????
If it maintains temp, that is good IMO.
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I believe my gauge is junk it would bury it at 250 and beyond after the first pass of the day and never made a attempt to really cool down but I could hold my hand on the pan. The sensor is in the side of the pan. And I have a puke tank which didn't fill up. I did smell tranny fluid on my last pass of the day going through the pits.
If you are smelling fluid I would say it is getting hot enough to be venting. It may not be actually venting fluid if the fluid level is low either by accident or maybe ran low to keep it from pushing fluid out. If it's not the gauge or sending unit good bet either the line pressure is low or not enough high gear clutches to handle the torque of the big block. Or the trans pump is warped and causing bleeding off of pressure. Same thing we ran into with Chevelle when the big stroke was added. Trans fine with the small stroke but the big engine was roasting the tranny till we found a pump and sealing ring issue.
This could be a million things as others have mentioned. First thing to do is use a temp gun and check the pan to make sure sensor is correct. If the sensor is correct remove the top line from the trans and place in a bottle. Crank engine and it should pump 1 quart in 30 sec minimum. This is to check cooler flow. If flow is good we then need to either look at converter,pump or input shaft or all 3!!!
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Thank you Mr FTI a quart in 30 sec , good info, -also trans fliud shouldn,t good over 240,- in my opinion , doesn,t hurt to use improved fluid - right -
While we are talking about trans temp what should the temp be so it does not affect performance or consistency. What is a good range?
The sensor was incorrect using a temp gun the temp. was almost 100 degree difference. Thanks for all the responses.
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