Gearing & Tires: Gear information, crawl and why should I re-gear when I get bigger tires. What are they, and what is my crawl ratio?
• Final Drive = (Tranny Ratio) x (Transfer Case Ratio) x (Axle Ratio) How many times the engine has to turn the 1st driveshaft to rotate the axle/tires 1 revolution. • First Gen manual Amigos and pickups all have the MUA5 tranny with a 3.767 first gear and a 2.28 transfer case ratio. to the best of my knowledge they were only available with 4.55 gears stock, though some have upgraded to 4.77s. • The early Amigos with 4×4 all came with 4.55:1 axle gear ratios, 2.28:1 4Lo transfer case gear ratios and a 3.767 1st gear in the tranny. Here’s a list of the combined gear ratios to find your final gearing. Also added in are the numbers for the upgraded gear sets for the front and rear axles. Note: Diff = Differential. Final Gearing — Stock 1st 4wLo Axle/Diff 3.767 x 2.28 x 4.55 = 39.1:1 (pure stock) 3.767 x 2.28 x 4.77 = 41.0:1 3.767 x 2.28 x 5.38 = 46.2:1Final Gearing — with the tera low Xfer-case gears. 1st 4wLo Axle/Diff 3.767 x 3.07 x 4.55 = 52.6:1 3.767 x 3.07 x 4.77 = 55.2:1 3.767 x 3
• Final Drive = (Tranny Ratio) x (Transfer Case Ratio) x (Axle Ratio) How many times the engine has to turn the 1st driveshaft to rotate the axle/tires 1 revolution. • First Gen manual Amigos and pickups all have the MUA5 tranny with a 3.767 first gear and a 2.28 transfer case ratio. to the best of my knowledge they were only available with 4.55 gears stock, though some have upgraded to 4.77s. • The early Amigos with 4×4 all came with 4.55:1 axle gear ratios, 2.28:1 4Lo transfer case gear ratios and a 3.767 1st gear in the tranny. Here’s a list of the combined gear ratios to find your final gearing. Also added in are the numbers for the upgraded gear sets for the front and rear axles. Note: Diff = Differential. Final Gearing — Stock 1st 4wLo Axle/Diff 3.767 x 2.28 x 4.55 = 39.1:1 (pure stock) 3.767 x 2.28 x 4.77 = 41.0:1 3.767 x 2.28 x 5.38 = 46.2:1Final Gearing — with the tera low Xfer-case gears.
