randys blog
Zumbrota Test Post 3
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Don’t Throw Away That Model 20 Rearend Yet!
The AMC model 20 rearend has been getting a bad rap for years. The two-piece axle design that AMC used in most Model 20’s is about as sturdy as using dental floss for a tow rope. For reasons of economy or otherwise, AMC stuck with its two-piece design axle right up until the very end. There are some applications that come with the one-piece axles stock, but they are few and far between. Given these drawbacks, you are probably thinking it is time to retire that Model 20 rear end. Not so fast. The two-piece axles are a weak link that can easily be overcome. Also, the ring & pinion in a Model 20 is actually larger than a Dana 44, so this larger gear can take more abuse and holds up well with tall tires. There are many sources for high quality one-piece replacement axles that are superior to the original design. I prefer designs that use Timken SET9 axles bearings. These high quality bearings do not need to be adjusted for proper end play. They hold up very well with oversized tires, and replacements are readily available if they become damaged by rust or wear. For those of you to whom cost is no barrier, Warn Industries now makes a full float axle kit. These high quality kits use forged 29 spline axles and include all of the hardware to make you M20 a full float rear end. As far as axle strength goes, the M20 axles are 29 spline and are virtually as strong as the 30 spline D44 axles. I have seen axles break in both rearends, so neither is completely indestructible. However, both are relatively strong and hold up well to all but the severest conditions. Upgrading to stronger axles is only the beginning of a strong rear end. I also recommend a good positraction or locker and the right gear ratio. You may say, “I told you this diff is a loser,” but any other design will also need a good traction differential and the right ratio. For occasional off-road use, the stock Trac-Lok limited slip may work, but I seldom recommend it due to its wimpy clutch design. Auburn Gear now makes a strong, aggressive limited slip that works well off-road and drives fairly smoothly on pavement. At one time, AMC used Powr-Loks in some passenger car applications. If they can still be found in wrecking yards, these work great for off road. There are also several locker available: Lock-Rights, EZ Lockers, ARB Lockers, and of course, the Detroit Locker. I personally like the strength and ease of use of the Detroit Locker. However, the ARB Airlocker is smoother for street driving, and the Lock-Right and EZ Lockers are easier to install. Don’t Throw Away That Model 20 Rearend YetWhen it comes to gears, the Model 20 ring & pinion gears are larger that those of the Dana 44. The D44 is ring gear 8.5″ in diameter and the M20 is 8.875″ in diameter. The pinion shaft on the M20 is also much larger and supports the pinion teeth very well under heavy loads. The only drawback of the M20 ring & pinion is the lack of numerically high ratios available. To my knowledge, 4.56 is the lowest (highest numerically) ratio available. A complete list of ratios that are available includes: 2.73, 3.07, 3.31, 3.54, 3.73, 4.10, and 4.56. So, yes, there are some shortcomings when using the Model 20 rearend. Nevertheless, when all is considered, I still believe that the Model 20 is a good choice in most situations, and the bad reputation earned by its weak axles is not reason enough to pitch the entire rear end.
Positraction Headquarters
Yukon Gear & Axle is known for offering the highest quality aftermarket differential and drivetrain parts. Backed by precision engineering, high strength performance steels, and tolerances that meet or exceed OE grade. Yukon manufactures the widest selection, including: ring & pinions, limited slips, lockers, axles, rebuild kits, hubs, driveshafts, and more! Builders, performance shops and enthusiasts that need quality parts for installation, racing and performance modifications depend on Yukon. Yukon Dura Grip The Standard in Positraction Limited Slip Differentials YUKON DURA GRIP YUKON DURA GRIP • Versatile performance allows quick reaction to all traction situations • Ready to handle high torque and shock loads with the use of 4320 Steel Bevel Gears, which are up to 50% stronger than OE materials • The heavy springs used in the Dura Grip provide ideal traction under light load, while the precision bevel gears further compress the composite clutch packs under heavy loads for best lock up • Exceptionally heavy-duty nodular iron case will outperform OE iron cases by 20-30% • Learn more about Limited Slip Differentials Find Your Dura Grip Now Find Your Dura Grip Now - Related Items - YUKON ZIP LOCKERS - AIR OPERATED LOCKER Yukon’s most impressive locker yet, forged from an entirely steel case to protect the internals with minimal deflection and maximum strength • Air operated intelligently designed locker, compact air compressor sold separately • Designed to handle extreme torque and shocks loads, heat treated 4320 & 9310 steel bevel gears and lock ring let you unleash power and stay locked until you disengage the locker • Bevel gears are optimized using our specialized design software to create a stress balanced tooth design that promotes superior strength and eliminates weak links More Info YUKON GRIZZLY LOCKER The Yukon Grizzly Locker is the ultimate in mechanical locking differentials for street, off-road, and drag racing. Grizzly Lockers provide 100% power to both tires, while still allowing for disengagement while negotiating turns. • 8620 internals for added strength • Assembled in the USA • For various differentials • Installs into standard open carrier • Patented internal design reduces common locker failures More Info Y.E.S. Plan Lifetime Warranty YUKON EXTENDED SERVICE (Y.E.S.) PLAN Get the Yukon Extended Service (Y.E.S.) Plan to Warranty to your Yukon products for life. The Y.E.S. plan offers low cost, no-questions-asked warranty coverage for as long as you own your vehicle on the following items: - 3rd Members - Front & Rear Axles - Zip Lockers - Performance Driveshafts - Grizzly Lockers - Dura Grips - Ring & Pinion Sets Get a YES Plan now YUKON'S QUALITY ADVANTAGE Yukon Gear & Axle is renowned for offering the highest quality aftermarket differential and drivetrain parts. Using precision engineering, high strength performance steels, and tolerances that meet or exceed OE grade, Yukon manufactures the widest selection including ring & pinions, limited slips, lockers, axles, rebuild kits, hubs, driveshafts, and more! Builders, performance shops and enthusiasts that demand quality parts for installation, racing and performance modifications use Yukon parts. YUKON QUALITY Step up to the quality of Yukon Gear & Axle. Engineered in our Everett, Washington headquarters, Yukon uses state-of-the art design, manufacturing, and testing processes, backed by 2 in-house quality labs to ensure every item meets exact specifications & quality standards. WIDEST SELECTION With over 4000 part numbers, our parts span everything from diesel trucks, high performance, rock crawlers, circle track, street racing and general performance to name a few. Our parts are developed for most all domestic and select Import vehicles with a differential. HIGH FILL RATE + FAST SHIPPING Yukon Gear & Axle boasts an incredibly strong distribution network throughout the US with ties throughout the world. In addition, Yukon has seven fully stocked warehouses with 1-2 day shipping nationwide. 2 day shipping covers 95% of the USA. BEST IN CLASS SERVICE Yukon Gear & Axle knows what it takes to keep our products on the streets. Great customers service, impeccable part quality and the technical knowledge to keep it all together. We far outreach the competition, supporting our customers to ensure that the parts they purchase are backed by with industry forward quality, warranties, and technical support.
The Randys Advantage
RANDYS ADVANTAGE RANDYS Worldwide is renowned for offering the highest quality aftermarket drivetrain and differential parts with USA Standard OEM replacement parts, Yukon Gear high performance parts, and Zumbrota Drivetrain complete manual transmission, transfer case, and axle assemblies. QUALITY Engineered in our Everett, Washington headquarters, RANDYS Worldwide uses state-of-the art design, manufacturing, and testing processes, backed by two in-house quality labs to ensure every item meets exact specifications & quality standards. WIDEST SELECTION With 19,000 part numbers, our parts span everything from 1948 to present covering both domestic and foreign vehicles. Have a vintage muscle car? Check, we have parts for that. Have a 2019 Jeep Wrangler Rubicon? Check, we have parts for that too. Toyota 4Runner? Suzuki Samurai? Xterra? Check, check, and check. From vintage to modern, restoration to high performance, low riders to rock crawlers, as long as your vehicle has a differential, we have the drivetrain parts it. HIGH FILL RATE + FAST SHIPPING RANDYS Worldwide boasts an incredibly strong distribution network throughout the US and global shipping partners. In addition, RANDYS 7 fully stocked warehouses deliver 1-2 day shipping nationwide. What's more, 2 day shipping covers 95% of the USA. SERVICE RANDYS Worldwide knows what it takes to keep our products in vehicles on and off road. We start with impeccable parts quality, deep technical expertise, and exceptional customers service to keep it all together. Our service level means that we far surpass the competition, supporting our customers to ensure that the parts they purchase are backed by industry forward quality, warranties, and technical support. It all Starts with Quality RANDYS WORLDWIDE | THE DIFFERENTIAL EXPERTS In the world of differential excellence: technology, quality & product knowledge make the difference in choice. Learn how RANDYS works to bring you the best differential products in the industry. Widest Selection of Drivetrain Parts, Kits, and Complete Assemblies OEM Replacement and Performance Parts Offering performance limited slip differentials, mechanical lockers, air operated lockers, spools, axles, and ring and pinions in a large array of ratios. Small Parts Axle bearings, seals, studs, u-joints, washers, spacers, crush sleeves - we have what you need to finish the job. Driveshafts From OEM replacement to performance with multiple options and varieties of styles, we have the driveshafts to suit your needs and budget. From CV to slip-yoke to double cardan and all other styles, RANDYS has you covered. Transfer Case Components & Complete Units Need a component part? No problem. Need a completely re-manufactured, state of the art unit? We have those too. Our transfer case parts and full builds are made with the highest quality processes that surpass industry standards. Transmission Units & Parts Offering a full breadth of Standard Transmission (Manual Transmission) components and complete high quality units. Complete Axle Assemblies Why rebuild when you can save time and just install a high quality remanufactured axle assembly. Complete with all new internals, seals, bearings, and everything you need to get back on the road in a jiff.
