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I have a 2001 D/A 3500 4x4, with a transfer case that has been making noise. The tranny shop here in town, has almost completed the work, but when they went to reinstall the bearings and seals, the replacements were all too small. The chain was different also, but I think the planetary and other parts were correct. He has had some problems getting the correct parts, evidently there is more than 1 size transfer case with the 263 identifying tag. Is there any other identifying characteristics so I can help him get the right parts, and get my truck back? (Its been almost two weeks, and I'm going through some serioous truck withdrawls!!!)





Thanks, Mike
 

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<TABLE width="100%" border=1><A name=tab2-819092><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=819092&evc=sm&pubid=297&cellId=62366&mspsdsubkey=2197#tab2-819092" target="_blank">
<H4>NVG 263 Variations</H4></A>
<T>
<TR>
<TH vAlign=bottom align=middle>


Model</TH>
<TH vAlign=bottom align=middle>


Transmission</TH>
<TH vAlign=bottom align=middle>


Input Gear</TH>
<TH vAlign=bottom align=middle>


Output Shaft</TH>
<TH vAlign=bottom align=middle>


Chain Size</TH>
<TH vAlign=bottom align=middle>


Hi/Low Planetary</TH>
<TH vAlign=bottom align=middle>


Application</TH></TR>
<TR>
<TD vAlign=center align=left>


Heavy Duty (HD)</TD>
<TD vAlign=center align=middle>


MT1 - 4L80E


MN8 - 4L80E HD</TD>
<TD vAlign=center align=middle>


32T


Spline</TD>
<TD vAlign=center align=middle>


32T


Spline</TD>
<TD vAlign=center align=middle>


7/16 X 1.5 in</TD>
<TD vAlign=center align=middle>


6 Pinion</TD>
<TD vAlign=center align=middle>


K2, K3 </TD></TR>
<TR>
<TD vAlign=center align=left>


Super Heavy Duty (SHD)</TD>
<TD vAlign=center align=middle>


M74 - Allison</TD>
<TD vAlign=center align=middle>


29T


Spline</TD>
<TD vAlign=center align=middle>


31T


Spline</TD>
<TD vAlign=center align=middle>


7/16 X 1.5 in</TD>
<TD vAlign=center align=middle>


6 Pinion</TD>
<TD vAlign=center align=middle>


K2, K3 </TD></TR></T></TABLE>


The HD and the SHD model share many of the same components, but the increased torque capacity of the SHD requires a double row input bearing, larger diameter rear output shaft, rear output shaft bearing higher capacity, larger rear seal and case halves machined differently.
 
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