Thanks to Slamchops at FSC for this information. He get all the credit for this. I copied this from that site if thats ok. This was a lot of help when I was looking at getting larger tires for my Hoe.
These are only common lift/tire combinations that seem to work well together. Some setups may rub in off-highway situations, but most allow for clearance. Any wheel that is 'not recommended' for that particular height can be run, but is not advisable.
Metric Tire Size Conversion
OBS Trucks (88-98), OBS SUVs (92-99):
Stock height
- 285/75R16 & 32/11.5R15 on Stock wheels or 16x8/15x8 (possible torsion bar crank); 16x10/15x10 not recommended
- 305/70R16 & 33/12.5R15 on Stock wheels or 16x8/15x8 (torsion bar crank and light trimming); 16x10/15x10 (torsion bar crank and heavy trimming, or cutout flares)
3" Suspenion Lift or Body Lift
- 305/70R16 & 33/12.5R15 on Stock Wheels or 16x8/15x8; 16x10/15x10 (possible torsion bar crank and light trimming)
- 315/75R16 & 35/12.5R15 on Stock Wheels or 16x8/15x8 (torsion bar crank and heavy trimming, or cutout flares); 16x10/15x10 not recommended
4" Suspension Lift
- 305/70R16 & 33/12.5R15 on Stock Wheels or 16x8/15x8; 16x10/15x10 (possible torsion bar crank and light trimming)
- 315/75R16 & 35/12.5R15 on Stock Wheels or 16x8/15x8 (torsion bar crank and heavy trimming); 16x10/15x10 (cutout flares)
6" Total Lift (3" Suspension Lift + 3" Body Lift or 6" Suspension Lift)
- 315/75R16 & 35/12.5R15 on Stock Wheels or 16x8/15x8; 16x10/15x10 (possible torsion bar crank and light trimming)
- 36/12.5R16 & 36/12.5R15 on Stock Wheels or 16x8/15x8 (torsion bar crank and heavy trimming); 16x10/15x10 not recommended
7" Total Lift (4" Suspension Lift + 3" Body Lift)
- 315/75R16 & 35/12.5R15 on Stock Wheels, 16x8/15x8, or 16x10/15x10
- 36/12.5R16 & 36/12.5R15 on Stock Wheels or 16x8/15x8 (torsion bar crank and light trimming); 16x10/15x10 (torsion bar crank and heavy trimming, or cutout flares)
9" Total Lift (6" Suspension Lift + 3" Body Lift)
- 315/75R16 & 35/12.5R15 on Stock Wheels, 16x8/15x8, or 16x10/15x10
- 36/12.5R16 & 36/12.5R15 on Stock Wheels, 16x8/15x8, or 16x10/15x10
- 38/15.5R16 & 38/15.5R15 on 16x10/15x10 (torsion bar crank and light trimming)