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Jeep YJ Wrangler AX15 Transmission Reverse Problems

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Reverse is making lots of noise in my 1995 Jeep yj wrangler.  I was told there is a transmission with a "g" after the AX15 that means there is a wiring harness coming from top of tranny.  But wiring is on top of bell housing on my tranny. I was also told my jeep had a 21 millimeter tranny in it by using the vin number at Chrysler dealership so I was curious as to exactly what is in it.

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Hi, Jeeplady95!  So, you have a 4.0L inline six-cylinder engine?  That would be the AX15 transmission.  The four-cylinder 2.5L uses the AX5.  Here are the official Mopar part numbers for the complete transmissions offered in 1995 Jeep YJ and XJ vehicles: 
52108022 XJ 2.1 Turbo Diesel Engine 1994
52108121 X1,XJ 2.5 Turbo Diesel Engine. 1995
52108049 YJ,Y1 2.5L Four Cylinder Engine, 4WD
52108045 XJ, X1 2.5L Four Cylinder Engine, 2WD
52108046 X1 2.5L Four Cylinder Engine, 4WD, EGYPT, MALAYSIA
52108046 XJ 2.5L Four Cylinder Engine, 4WD
52108021 X1 2.5L Four Cylinder Engine, 4WD, CHINA, ARGENTINA, VENEZUELA, MALAYSIA, EGYPT
52108050 Y1, YJ 4.0L Six Cylinder Engine
52108048 XJ, X1 4.0L Six Cylinder Engine, 2WD
52108047 XJ, X1 4.0L Six Cylinder Engine, 4WD
53009526 ZGZJZ1 4.0L Six Cylinder Engine
52109021 ZGZ1 2.5 Turbo Diesel

This Mopar part number should be located on the top of the transmission case if the assembly is the original for this Jeep.  (This 53005385 unit came from a 1991 Jeep XJ Cherokee.) Here are some identifying features of an AX15 for a YJ or XJ Jeep.  Note that this unit has only one electrical wire, at the side of the case, and the switch is part of the backup light circuit:

post-1-0-34280700-1412464491_thumb.jpg post-1-0-87783300-1412464491_thumb.jpg post-1-0-33992300-1412464492_thumb.jpgpost-1-0-78365100-1412464492_thumb.jpg

It would also be helpful to watch this trailer for my Vimeo On Demand how-to instructional video on rebuilding the AX15 transmission:

If you do have an AX15 transmission that requires rebuilding, and if you're planning to rebuild the transmission yourself, the entire bench rebuild and restoration is covered in the HD video rental at Vimeo On Demand: https://vimeo.com/ondemand/ax15rebuild.  Each rental period is 30 days to provide plenty of time for getting parts and performing the work.
I have the vehicle decoding chart.  If you furnish the letter portion of the VIN (do not need your serial numbers), I can clarify.  It still comes down to the AX5 with 2.5L four and AX15 with the 4.0L engine.  The only "G" in the VIN decode has to do with GVWR (Gross Vehicle Weight Rating).   
We can address more of your questions about the Wrangler's transmission...

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