Whenever the gear ratio in a differential is changed, pinion diameter changes. There are two things that must change in order for the gear ratio to change. First, some basic information. The gear ratio is determined by the tooth combination. The number of teeth on the ring gear divided by the number of teeth on the pinion (eg: 41/11 = 3.73) equals the gear ratio. Also, in order for the teeth...
When working on any rearend, always pay very close attention to the axle shafts and axle bearings. Sealed ball bearing type axle bearings are usually very easy to diagnose and any roughness makes replacement the obvious choice. Flat roller bearing style axles are not as obvious to diagnose, and many times people dismiss wear that soon after leads to larger problems. Any pits, rust, grooves, or...
Taking care of the details requires knowing which details are important, and having the discipline to check every detail on every job. Here is a partial list of details that we have found to make a difference when assembling a differential. Pay very close attention to the bearing hubs on the carrier case. If the old carrier bearing spins on the case, the new bearing will not fit tight and...
It’s obvious u-joints are a critical component in any driveline so understanding their key mesurements and general specs is important. We have put this spotter’s guide together to answer some of the basic questions regarding universal joints. Parameters such as cap diameter, ring diameter, and the availability of adapters are outlined. There is also a listing of common...
Typically, steel is rated by the SAE or the ASM according to its particular elements. Proven and standardized “recipes” are issued a four-digit number. The first two signify the steel group, i.e. carbon steel, nickel-chromium-molybdenum steel, etc. The second two indicate the carbon content in hundredths of a percent, which is variable according to end use. 10XX, 11XX, 12XX, 15XX = The...
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