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Rusty Trans Dipstick

3580 Views 9 Replies 4 Participants Last post by  ccr91
Aloha dmaxallitech,


First, thanks for taking the time to answer these questions.


Background: I have a 1997 S-10 Blazer with 4.3L and auto. I have changed the trans fluid every 25-30K miles. After the 60K change, I noticed a lot of rusty sludge building on the trans dipstick. I have attempted an internet search and found a few threads that mentioned others have had this problem and appears to be the tube is rusting.


I have three questions. 1 - Is this a known problem and will a new tube, along with fluid change, fix the problem? 2 - Can I change the tube without dropping the trans? The clearance to pull the trans/engine bolts looks tight. 3 - How do I prevent this in the future?


Thanks again, Corey.
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<H1><font size="2">HERE YA GO::</font></h1>
<H1>Tech - Rusty Transmission Fluid Level Indicator/Transmission Oil Filler Tube #99-07-30-004A - (10/06/1999)</h1></table>Rusty Transmission Fluid Level Indicator/Transmission Oil Filler Tube (Replace Indicator and Filler Tube)


1995-98 Chevrolet and GMC S/T Models


1996-98 Oldsmobile Bravada


with 4L60-E Automatic Transmission (RPO M30)


This bulletin is being revised to correct parts description information. Please discard Corporate Bulletin Number 99-07-30-004 (Section 07--Transmission/Transaxle)


Some owners may comment about rust on the transmission fluid level indicator and the transmission oil filler tube.


Water entering through the grommet of the indicator may cause this condition.


A new transmission fluid level indicator, with an improved grommet and corrosion resistant metal, has been developed to correct this condition. Replace the indicator and, if necessary, replace the transmission oil filler tube on affected vehicles. Use the following procedure and the appropriate part numbers listed below.

  1. <LI =1>Replace the indicator with the revised indicator.
    <LI =1>Also, inspect the transmission fluid filler tube for signs of excessive rust on the inside or outside of the tube. Replace the tube as necessary. Refer to the Filler Tube Replacement procedure in the Automatic Transmission 4L60-E subsection of the appropriate Service Manual.
    <LI =1>Change the transmission fluid. Replace the transmission filter. Refer to the Transmission Filter Replacement procedure in the Automatic Transmission 4L60-E subsection of the appropriate Service Manual.
<A name=ss4-641479><a href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=641479&pubid=39&evc=sm#ss4-641479" target="_blank">
<H5>Parts Information</a></h5>
<TABLE width="100%" border=1>
<T>
<TR>
<TH vAlign=bottom align=middle>


P/N</th>
<TH vAlign=bottom align=middle>


Description</th>
<TH vAlign=bottom align=middle>


Qty</th></tr>
<TR>
<TD vAlign=center align=middle>


15033543</td>
<TD vAlign=center align=middle>


Indicator, Trans. Fluid Level


(LN2)</td>
<TD vAlign=center align=middle>


1</td></tr>
<TR>
<TD vAlign=center align=middle>


15033544</td>
<TD vAlign=center align=middle>


Indicator, Trans. Fluid Level


(LF6/L35)</td>
<TD vAlign=center align=middle>


1</td></tr>
<TR>
<TD vAlign=center align=middle>


15704674</td>
<TD vAlign=center align=middle>


Tube, Trans. Fluid Level Ind


(LN2) (95-97)</td>
<TD vAlign=center align=middle>


1</td></tr>
<TR>
<TD vAlign=center align=middle>


15722634</td>
<TD vAlign=center align=middle>


Tube, Trans. Fluid Level Ind


(LN2) (1998)</td>
<TD vAlign=center align=middle>


1</td></tr>
<TR>
<TD vAlign=center align=middle>


15735192</td>
<TD vAlign=center align=middle>


Tube, Trans. Fluid Level Ind


(LF6/L35) (96-98)</td>
<TD vAlign=center align=middle>


1</td></tr>
<TR>
<TD vAlign=center align=middle>


15999402</td>
<TD vAlign=center align=middle>


Tube, Trans. Fluid Level Ind


(LB4/L35) (1995)</td>
<TD vAlign=center align=middle>


1</td></tr></T>&lt
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Corey, hate to sound rude, but does it hurt to sitdown? 4500 is enough for an Allison!!! 2500 should get you a gm reman installed. I wouldnt do anything until you let me know the code(s) There is codes for the tranny as well... Let me know what they are please before doing anything drastic
Code 1870 is Trans slip detected. usually caused be high tcc slip which is not noticable to the driver but the pcm picks it up. How does the tranny work? just a code in it? any debris in the pan?.. There is an aftermarket valve to put in the valve body made by sonnax that can cure it if its caused from excessive tcc slip, this code will also cause harsh shifts as it commands max line pressure. If the trans operation is ok and no problems other then ses light on, you can fix it for a few hundred bucks tops.
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