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Old 01-18-2011, 05:45 PM
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Re: 5.7 Hemi First Oil Change

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Originally Posted by Bmwister View Post
**Don't forget about the TRANSMISSION**
With all the talk about engine oil, the fact is most times it's the transmission that is ignored and gives up the ghost before the engine. I suggest that the transmission fluid be flushed at ~30,000 miles. I also change the transfer case lube and engine coolant at 30,000 miles just for good measure. Considering the Hemi plugs need changing at 30,000 miles too it would be an easy to remember service interval. It's cheap insurance just like engine oil changes for those who keep vehicles a long time.

What does the owners manual say about tranny fluid changes? Also, im not the biggest fan of using those flush machines. From what I have read (I know its not personal experience, but seemed to be from reputable sources), that those flush machines have been known to cause issues mainly in higher mileage cars. I guess what happens is it forces fluids to move through ports in the direction it wasnt designed to and causes foreign debris to possibly damage parts of the tranny as it enters areas that it normally woudlnt. I dunno, like I said this is just what I have read. They simply stated the safest way to do tranny fluid changes is by draining and refilling...usually has to be done multiple times to get all the fluid. Can anyone else comment on this?

James

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  #26  
Old 01-18-2011, 06:36 PM
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Re: 5.7 Hemi First Oil Change

Quote:
Originally Posted by JTS97Z28 View Post
What does the owners manual say about tranny fluid changes? Also, im not the biggest fan of using those flush machines. From what I have read (I know its not personal experience, but seemed to be from reputable sources), that those flush machines have been known to cause issues mainly in higher mileage cars. I guess what happens is it forces fluids to move through ports in the direction it wasnt designed to and causes foreign debris to possibly damage parts of the tranny as it enters areas that it normally woudlnt. I dunno, like I said this is just what I have read. They simply stated the safest way to do tranny fluid changes is by draining and refilling...usually has to be done multiple times to get all the fluid. Can anyone else comment on this?

James
You're correct it doesn't get all of the fluid as there is quite a bit in the torque converter that isn't flushed out or replaced. I believe it it is around the 30K mark when the transmission fluid needs changed (check the manual to be sure). The bad part about the flush machine isn't just that it doesn't get all of the fluid but the internal filter isn't replaced. The transmission in the 5.7's is the 545RFE and I'm pretty sure it has two internal filters which makes matters worse if it isn't changed. My Dad (once again the retired mechanic) always says they put that filter in there for a reason so change it when the fluid is replaced so the filter(s) can do its job.
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