Megadan Posted April 30, 2015 Share Posted April 30, 2015 I've searched and scrounged and read a bunch, but when I try to find a limited slip for 3.55 gears on the D30 I run into some conflicting information.The basics of the story are. I have a set of Moog "upcountry" CC782 springs on the way to use with my spacers along with some chevy drop shackles. My plan is to run 31" tires, but I need to re-gear. 3.55's with the manual transmission are looking like the right gears for me. I would be right at about 1900rpm at 60mph, which is much better than the 1700 I currently sit at with my 3.07's and 235/75-15 tires.So, my plan is to either grab a ford 8.8, or maybe an 8.25 Chrysler with 3.55 gears already in it. and a 3.55 geared D30 front from an XJ at the yard that I can also build up a little. I want to at least brace the C's and maybe do a truss or inner sleeves. Not really necessary for 31's, but I have always liked a little overkill.Now, the real issue is. i want to run some sort of limited slip at each end, ideally truetrac diffs. Whenever I search for limited slips I get conflicting information on what gear types can be used. They either say 3.73 and up only, which basically eliminates my options for an LSD, or that any ratio can be used. Can somebody clarify this? I'm scratching my head, and not able to really find a solid answer. Link to comment Share on other sites More sharing options...
ftpiercecracker1 Posted April 30, 2015 Share Posted April 30, 2015 I strongly suggest you look into the Volvo LSD swap. Long story short, Volvo 740s and 240s used the Dana 30 as a rear axle and some came with a gear driven LSD (torsen, I think). It is a 99% direct swap, the only thing that must be done is shorten one of the axle shafts, I don't remember which one, by 3/8th of an inch. YouTube has a great 3 part series explaining all of it. Link to comment Share on other sites More sharing options...
Megadan Posted April 30, 2015 Author Share Posted April 30, 2015 I strongly suggest you look into the Volvo LSD swap. Long story short, Volvo 740s and 240s used the Dana 30 as a rear axle and some came with a gear driven LSD (torsen, I think). It is a 99% direct swap, the only thing that must be done is shorten one of the axle shafts, I don't remember which one, by 3/8th of an inch. YouTube has a great 3 part series explaining all of it. Oh, I may look into that option. Old Volvos are fairly easy to find at the yards here. I would prefer something a little more bolt in, but affordable options are always welcome. Link to comment Share on other sites More sharing options...
Rockfrog Posted April 30, 2015 Share Posted April 30, 2015 The D30 has a carrier break ... So uses two carriers depending on gear choice. 3.73 and up use one carrier, and for lower (numerically) there is another carrier. The only difference between the two is the spacing of the ring gear in relation to the pinion. Link to comment Share on other sites More sharing options...
yxmj Posted April 30, 2015 Share Posted April 30, 2015 It is the drivers side shaft that has to be trimmed (for the volvo diff) Link to comment Share on other sites More sharing options...
Incommando Posted April 30, 2015 Share Posted April 30, 2015 http://www.rustysoffroad.com/jeep-driveline-driveshaft/jeep-lockers-arb-air-lockers-lock-right-detroit/detroit-locker-truetrac/detroit-truetrac-model-30-3-54-down.html http://www.summitracing.com/parts/dtl-912a584/overview/ Over a dozen options simply by typing in "Dana 30 TrueTrac" in Google and knowing the gear ratio to pick between the offerings. Who woulda thunk it? :doh: Link to comment Share on other sites More sharing options...
88whitemanche Posted April 30, 2015 Share Posted April 30, 2015 I got my volvo lockers out of the 940 versions.... But look into the manual volvos they are sapose to have the 355 and down gears and the autos have the 3.73 and up Link to comment Share on other sites More sharing options...
Megadan Posted April 30, 2015 Author Share Posted April 30, 2015 http://www.rustysoffroad.com/jeep-driveline-driveshaft/jeep-lockers-arb-air-lockers-lock-right-detroit/detroit-locker-truetrac/detroit-truetrac-model-30-3-54-down.html http://www.summitracing.com/parts/dtl-912a584/overview/ Over a dozen options simply by typing in "Dana 30 TrueTrac" in Google and knowing the gear ratio to pick between the offerings. Who woulda thunk it? :doh: Yea, ended up finding the one on summit. Whenever I tried searching Dana 30 Limited Slip, I just got 3.73 and up or Dana 44 30 Spline diffs. I will be the first to admit that I suck at Google :hmm: What I don't get is the price difference between the 3.54 and down and 3.73 and up. It's over $100 more for the 3.54 and down carrier. Now, with the true trac side covered, I did mention other limited slip types as well. :doh: P.S. your rusty's link doesn't work for me for some reason Link to comment Share on other sites More sharing options...
Incommando Posted April 30, 2015 Share Posted April 30, 2015 The majority of d30's seem to have come with 3.73's or at least people wanting to change them making the one you need less popular? Otherwise yeah it makes no sense for the same basic part? Good luck Link to comment Share on other sites More sharing options...
Megadan Posted May 1, 2015 Author Share Posted May 1, 2015 The majority of d30's seem to have come with 3.73's or at least people wanting to change them making the one you need less popular? Otherwise yeah it makes no sense for the same basic part? Good luck I chalk it up to demand. Most people won't buy a diff for 3.55's, because most people aspire to more than 31's or don't care about on-road manners as much. Link to comment Share on other sites More sharing options...
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