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A variation of the Dana 60 known as a Dana 61 was made to accommodate gear ratios that allowed for better fuel mileage. This was done as a direct result of the 1973 oil crisis. A 3.07:1 gear ratio was common for these axles and unachievable in a regular Dana 60. To allow for the different gearing, the Dana 61 had a greater pinion offset.
For model year 2000 - 2004 trucks, the F-150 7700 offered this axle and the F-250 light duty was discontinued. At least till 2011 the 12 bolt semi float was still found with the heavy duty f-150. Gear ratios were 3.73 in 4x4 and either the 3.73 or 4.10 in the two-wheel-drive models. This was available in both limited slip and standard variations.
The M600 was offered with the Rockwell F-130-NX rear axle, with a 4.88:1 gear ratio. By 1979, Chrysler Corporation no longer sold incomplete chassis and ended production of the M series. The M series was available with three engines during its production: The 318 polysphere Chrysler A engine, the 413 cid, and the 440 cid Chrysler RB engine
The Dana 70 axle only came with 5.13:1, 4.88,5.31 [citation needed] gear ratios and had a GAWR of [citation needed] these axles were rated at 7-9klbs as seen on 5500 door stickers. They differ greatly from previous Dana 70 front axles, some of the major differences being the use of 1550 Universal Joints and being a high pinion, reverse cut axle.
The Dana 80 Trac Lok is unique being it is a 4 pinion unit, unlike other Dana Trac Lok units with 2 pinions. This was the only rear axle available for the 2nd generation Dodge Ram 3500 trucks. [2] 35 Spline Dana 80 in a 2002 Dodge 2500HD Diesel
Since 1970; optional was a four-speed manual transmission (equipped with a Hurst shifter) mated to a performance ratio (3.55 to 1) rear axle for the 340 and 360 engines, though as many as three cars (in both 1973 and 1974) were built with the 318 engine and Hurst 4-speed thru special orders or factory errors.
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Manual transmission equipped cars, code A-833, featured a Dana 60 built heavy-duty axle with a 4.88 gear ratio, heavy-duty clutch, steel bellhousing, and special torque shaft and pivots. Manual transmissions were modified by removing synchronizers which lowered the chances of missed shifts. A Hurst floor-mounted shifter came standard.