I HAVE A 88 SAMMY STOCK GEARING IN DIFFS AND TRANSFER ON 33-12.5 15 TSL.  I DRIVE ON ROAD AND HIGH WAY AS WELL AS OFF ROAD.   THE THING IS WHEN I GO TO SILVER LAKE SAND DUNES I REALLY CAN NEVER LEAVE 1ST GEAR ( I CAN'T KEEP THE RPMS UP).  I COULD GO 4.57 (STOCK IS 3.73) IN THE DIFFS, 4:1 TRANSFER CASE GEARS OR 6:5:1, OR A MEGA CRAWLER 6:1.  FIRST, I HAVE NO CLUE WHAT THE 4:1, 6:1 TRANSFER MEANS OR THE 6:5:1, CAN SOMEONE HELP ME WITH THAT (THE T-CASE GEARING)?  ALSO WHAT IS THE BEST WAY TO GO IF STILL GOING TO BE ON ROAD AND OFF ROAD,  CURRENTLY ON ROAD i HIT 55-57 MPH TOPS.  I LIKE TO KEEP IT AROUND 55MPH AND STILL HAVE MY POWER AVAILABLE OFF ROAD.  I HAVE PLENTLY OF POWER IN 1ST BUT NOT MUCH AFTER THAT GEAR.  IT HAS STOCK MOTOR 1.3L AND STOCK CARB.  I DON'T HAVE A LOT OF $ TO SPEND ON THIS AS WELL.  I DO HAVE A SPARE TRANSFER CASE, SO I COULD REBUILD AND STILL USE SAMMY UNTIL READY TO CHANGE T-CASES, BUT I NEED YOUR ADVICE WHAT HAVE YOU DONE, OR WHAT WOULD YOU DO IN THIS SITUATION? THANKS JOHN

I would send that extra t-case off and let the guys a Lowrange off road put the gearset in for you. I would go with the 6.5:1 gears. That is the set they recommend for your tires, but I am sure any of the gearsets would help.

http://lowrangeoffroad.com/samtcase.htm

I SHOULD BE ABLE TO PUT THE GEARS IN MYSELF, RIGHT? 

Yes, you can put them in yourself.  It's not that hard to do if you take your time. 

Very easy to put in, also defiantly worth it to rebuild while your in the case.
Look into getting an updated front out put shaft, for you case also.

Amilla