There are three ways to find a gear ratio.
1 A dealer can normally tell from the vin number.
2 There are normally tags or labels on the axle that have part number, gear ratio, and fluid requirement
info.
3 You can count how many times you have to turn the driveshaft to get one complete turn of the tires.
'86 Samurai 5 speed transmission 1st gear final reduction ratio from the factory manual is: 3.652
80w90 gear oil
Your transfer case may be in neutrual.
GL5 75W90 or 80W90 gear oil.
The gear ratio of a 1989 Suzuki Sidekick typically depends on the specific model and drivetrain configuration. Commonly, the manual transmission models feature a gear ratio around 3.73:1 for the differential. However, it's essential to check the vehicle's specifications or owner's manual for the exact ratio, as variations may exist based on the trim and options.
The R&P Ratio on a '92 Suzuki Sidekick 1.6L depends on the transmission type: Automatic= 4.62 Manual=5.12 **See Related Links for Suzuki Manuals on Google Docs
did you ever find out what caused this i am having the same problem
GL-5 for gear oil and for engine oil use 10W-30
For a 1987 Suzuki Samurai axle, it's recommended to use 80W-90 gear oil, which is suitable for most differentials. If the vehicle is operated in extreme conditions, a synthetic 75W-90 gear oil may also be used for improved performance and protection. Always check the owner's manual for specific recommendations and ensure the oil meets API GL-5 specifications.
there is no computer on a 1988 suzuki samauri
Download the FREE Suzuki Samurai Shop Manual from http://www.suzukiinfo.com/ or visit zukikrawlers.com zn
80W90 in both use lucas or some type of synthetic like redline.