Freeway Flattie Part 1
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Freeway Flattie Part 1
Ultimate Spicer 18Okay, see if you can follow this. When I first built my ’53 DJ-3A I used low-pinion Ford 9-inch axles with 5.83s and stock 2.46:1 gears in a Spicer 18 Transfer Case . With the junkyard Warn Overdrive engaged, I could turn 2,850 rpm at 65 mph on the street, and the SM420’s 7.05:1 First gear gave a 101:1 crawl ratio, which was just about perfect for my relatively low-torque 3.5L Shortstar DOHC V-6. Then the hardcore bug bit and I replaced the Spicer 18 with a built Dana 300 running stock 2.62:1 gears and 32-spline front and rear output shafts. The Dana 300 has a much higher rear output location than the Spicer 18 , so to get a rear driveshaft in the thing I had to build a new centered rear axle with a high-pinion True Hi9 centersection. The axle build required a gear change to 5.38s since that’s the lowest ratio offered for the True Hi9. But even with the high-pinion rear diff, to prevent U-joint binding at full droop I had to run offset-trunion U-joints in the Tom Wood’s 1350 rear driveshaft. The crawl ratio of the new setup was nearly identical at 99:1, but without an Overdrive , my engine speed was a whopping 3,500 rpm at 65 mph. Not that I could ever reach that speed since the crazy rear driveshaft U-joints caused the Jeep to feel like you were riding a paint shaker even at modest road speeds.
Photo Gallery: Freeway Flattie Part 1 - Jp Magazine
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Ultimate Spicer 18Okay, see if you can follow this. When I first built my ’53 DJ-3A I used low-pinion Ford 9-inch axles with 5.83s and stock 2.46:1 gears in a Spicer 18 Transfer Case . With the junkyard Warn Overdrive engaged, I could turn 2,850 rpm at 65 mph on the street, and the SM420’s 7.05:1 First gear gave a 101:1 crawl ratio, which was just about perfect for my relatively low-torque 3.5L Shortstar DOHC V-6. Then the hardcore bug bit and I replaced the Spicer 18 with a built Dana 300 running stock 2.62:1 gears and 32-spline front and rear output shafts. The Dana 300 has a much higher rear output location than the Spicer 18 , so to get a rear driveshaft in the thing I had to build a new centered rear axle with a high-pinion True Hi9 centersection. The axle build required a gear change to 5.38s since that’s the lowest ratio offered for the True Hi9. But even with the high-pinion rear diff, to prevent U-joint binding at full droop I had to run offset-trunion U-joints in the Tom Wood’s 1350 rear driveshaft. The crawl ratio of the new setup was nearly identical at 99:1, but without an Overdrive , my engine speed was a whopping 3,500 rpm at 65 mph. Not that I could ever reach that speed since the crazy rear driveshaft U-joints caused the Jeep to feel like you were riding a paint shaker even at modest road speeds.
Photo Gallery: Freeway Flattie Part 1 - Jp Magazine
Freeway Flattie Part 1 | Digg It | Add to del.icio.us
More...