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Author Topic: chevy 4500  (Read 1278 times)

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Offline woodmills1

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chevy 4500
« on: April 21, 2010, 08:57:59 PM »
when I did an oil and filter last week I noticed the allison transmission in my 2005 chevy 4500 has an external filter.   I bought the filter, and changed it the next day(almost didn't see the magnet that sits on top the filter) but wasn't happy about the trans fluid color, a bit brownish at 25,000 miles.  well low and behold there is a drain in the trans pan.  so here is my question

should i drain the pan and replace the fluid?
if so, what fluid and how much

I didn't get an owners manual with this used truck
James Mills,Lovely wife,collect old tools,vacuuming fool,36 bdft/hr,oak paper cutter,ebonic yooper rapper nauga seller, Blue Ox? its not fast, 2 cat family, LT70,edger, 375 bd ft/hr, we like Bob,free heat,no oil 12 years,big splitter, baked stuffed lobster, still cuttin the logs dere IAM

Offline wooddog

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Re: chevy 4500
« Reply #1 on: April 21, 2010, 09:29:17 PM »
Hi woodmills1 Draining the will not get alot out, There is a filter inside that you can get from you gm dealer  Drop the pan change the filter and see if there is alot of clutch dust or dark kind of slug in the pan If the truck was hailing heavy stuff or plowing It may mean the forward  clutches may be wore a bit, Put new oil in it start with about 6 liters  run the truck and top up as needed, don't drive it till It is at least on the full cold mark, Then drive till up to temp and recheck and top up, Should be ok then.

Offline wooddog

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Re: chevy 4500
« Reply #2 on: April 21, 2010, 09:35:50 PM »
I forgot put only dextron from your GM dealership Its the only that should be put in that trans. And it is a synthetic oil..   

Offline woodmills1

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Re: chevy 4500
« Reply #3 on: April 22, 2010, 07:53:02 PM »
thanks for the tip

I drained it and the dipstick said dextron I put 9 quarts and will wait 1000 miles and filter and 9 quarts again, it was not good lookin fluid I took out >:(
James Mills,Lovely wife,collect old tools,vacuuming fool,36 bdft/hr,oak paper cutter,ebonic yooper rapper nauga seller, Blue Ox? its not fast, 2 cat family, LT70,edger, 375 bd ft/hr, we like Bob,free heat,no oil 12 years,big splitter, baked stuffed lobster, still cuttin the logs dere IAM

Offline stonebroke

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Re: chevy 4500
« Reply #4 on: April 22, 2010, 09:04:17 PM »
You could see if BG systems can flush it. They pump fluid though until it is all clean.

Stonebroke

Offline ScottAR

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Re: chevy 4500
« Reply #5 on: April 24, 2010, 01:06:11 AM »
Dextron VI is the allison spec fluid.   It is synthetic.
Scott
"There is much that I need to do, even more that I want to do, and even less that I can do."
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