Internal tranmission filter

Jasonlmm

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Oct 14, 2014
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Will it hurt to change internal trans filter I call the dealer they said change it it wnt hurt but I've read so much ppl are saying DNt change the internal filter what should I do here it's only got 79000 miles on it should I just leave the internal filter alone and do external only or would it be better to do both
 

Mike L.

Got Sheep?
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Aug 12, 2006
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Change it. It's important to see what condition it's in. It's good to know if anything is going on internally.
 

JoshH

Daggum farm truck
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Feb 14, 2007
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Allison says it only needs to be changed during an overhaul, but you won't hurt anything by changing it with a normal service.
 

THEFERMANATOR

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Feb 16, 2009
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Allison says it only needs to be changed during an overhaul, but you won't hurt anything by changing it with a normal service.
What he said. It isn't going to hurt anything to change it, and it gives you a chance to see how much clutch material is in the bottom of the pan.
 

S Phinney

Active member
Aug 15, 2008
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Depending on use, I will do the spin on every 25k and internal and fluids every 75k. Read your owners manual and follow their suggested intervals.
 

MACKIN

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Aug 14, 2006
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You should have changes the fluid by now anyway . So drop the pan and swap out the internal filter. IMO the Allison spin on should be changed at every engine oil change. Approx 3500/5000 miles.
 

THEFERMANATOR

LEGALLY INSANE
Feb 16, 2009
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Many would say I go overboard, but every oil change(10K miles), I change the engine oil and filter(5W40 synthetic), trans spin on, and both of my fuel filters(I have a 30 micron pre-filter mounted on the frame). And at 25-30K miles I dropped the pan and changed the internal filter. Filters are cheaper than hard parts any way you slice it.