MJRemi Posted September 24, 2011 Share Posted September 24, 2011 I have never dealt with 4x4 until now, so sorry about what might be a silly question. The Silver 88 front diff says 3:55 but has a D35 in the rear. I want to put my D44 3:54 from the Black 88. Does the gearing have to be exact or is this considered "the same" ratio? I probably will not use 4x4 mode very often but when I do, I don't want to cause damage if the gears don't match. Link to comment Share on other sites More sharing options...
tbrand Posted September 24, 2011 Share Posted September 24, 2011 3.54 and 3.55 are essentially the same ratio - you won't have any issues. Link to comment Share on other sites More sharing options...
banshee Posted September 24, 2011 Share Posted September 24, 2011 :agree: but extended time on road in 4wheel could cause issues with the drivetrain over time ‘shouldn't be an instant thing’... Be careful and remember it’s there while in use on-road... B… Link to comment Share on other sites More sharing options...
Jeep Driver Posted September 24, 2011 Share Posted September 24, 2011 I've got 4.10 in front and 4.11 in rear, no issues. Link to comment Share on other sites More sharing options...
Geonovast Posted September 24, 2011 Share Posted September 24, 2011 Most of the gearing "differences" comes from people rounding differently. Dana 35 "3.55" gear tooth count is 39 on the ring, 11 on the pinion. 39/11 = 3.545454545454..... Some round up to 3.55, some round down to 3.54. AFAIK, the Dana 30(HP & LP), D35, and 8.25 all have the same tooth counts for 3.55. Most 4.10 and 4.11 difference I don't understand, since most of our Jeep axles are 41 ring / 10 pinion. 41/10 = 4.10 exactly, so no rounding. The D44 however is actually different, at 45/11 = 4.090909 and 46/13 = 3.53846. http://www.drivetrain.com/parts_catalog ... inion.html Link to comment Share on other sites More sharing options...
mvusse Posted September 24, 2011 Share Posted September 24, 2011 The difference between 3.54 and 3.55 is smaller than the difference between some of your tires due to air pressure fluctuations and tread wear. We are talking about a difference less than 1/5 of a percent (0.01976). Assuming all your tires are exactly the same, on a straight road in 4wd, for every mile the front wheels travel, the rears will try to travel travel about 10 feet less. That's 10 feet difference over a MILE. For all practical purposes they are the same, and are what came from the factory with a 4.0 4wd automatic and D44 rear axle (heavy duty rear axle, towing package, big ton/metric tonne package...). Link to comment Share on other sites More sharing options...
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