Front Carrier Assembly 1 hole under or 2 hole. 3.73

[RossMan]

Hey Gang,
I am new to GMTNation.com today and in search of answers to issues in regards to the front carrier Assy. for my 2003 Envoy,4.2, SLE. I have been trying to find the proper used part for replacement of the carrier assy. and the issue of 1 mounting hole or 2 mounting holes under the yoke comes up on every part I find that seems to be the proper fit. My envoy is a 2003 which from my research requires a 2 mounting hole under the yoke version. I am looking for a visual confirmation on this mounting hole issue because I have had a carrier assy. shipped to me from a salvage yard stating that it is from a 2004 Envoy with 3.73 gears.I am not 100% sure it is the proper unit. Prior to getting into the dismantling and replacement of the front end diff. I need to confirm that the unit I purchased does indeed fit my application.I know that best way to do this is to get the vehicle on a lift and check visually but there is a problem that keeps me from doing that at this time. I am laid up in bed after a total knee joint replacement and I am trying to do my research until I am recovered enough to to the work.
Does anyone have a diagram, picture or link to show just exactly what the two mounting hole version looks like as compared to the one hole version?I can provide a picture of the unit I got from the salvage yard but I am not sure on how to post it to a link. Thanks and any help would be greatly appreciated.

RossMan

 

[The_Roadie]

Welcome! I have been seeing that exact question for six years on the other site, and never saw a picture of a two-hole differential. Never read about anyone buying one.

Here's a pic

View attachment 18013

I'll continue to dig deeper, but somebody else here may have the answer. It may have also been a GM error from day one, implying there are two designs like the alternator capacity, when there was really only one version ever produced.

 

[RossMan]

Thanks Bill,
The pic you posted looks just like the one I just piced up from the salvage yard.
What year is that one from? the 1 hole from 2002 or the later 2 hole from 2003-09? Or both?
Thanks again... If something else comes up let me know.
RossMan

Welcome! I have been seeing that exact question for six years on the other site, and never saw a picture of a two-hole differential. Never read about anyone buying one.

Here's a pic

View attachment 2926

I'll continue to dig deeper, but somebody else here may have the answer. It may have also been a GM error from day one, implying there are two designs like the alternator capacity, when there was really only one version ever produced.

 

[RossMan]

The question seems to exist that there is no difference between the 1 or 2 hole versions. So I am looking for some type of description, diagram or picture of either to end the mystery that I cant figure out. The Roadie has been looking into it but if anyone else can shed some light on this topic any help would be greatly appreciated.
Thanks !
RossMan

 

[LMMJ]

The question seems to exist that there is no difference between the 1 or 2 hole versions. So I am looking for some type of description, diagram or picture of either to end the mystery that I cant figure out. The Roadie has been looking into it but if anyone else can shed some light on this topic any help would be greatly appreciated.
Thanks !
RossMan

Their is no 2 hole front diff. That would require a 2 hole oil pan which does not exist

 

[RossMan]

Their is no 2 hole front diff. That would require a 2 hole oil pan which does not exist

Thanks! All done. Installed and operational. 1 hole ... 2 holes... I never got a real reply that described the difference between the mounting hole question. I got the right assembly and it works. Thanks for the input.