jcsteele Posted October 22, 2017 Report Share Posted October 22, 2017 So whats the real cost here? I have heard all sorts of numbers thrown around.... I am a little bit more of a budget-friendly sort of HDTer so I am not above finding a rear end on Craigslist or the likes and swapping it in but how the heck do I know which ones will fit?? I am not 100% sure what my current gears are but with my series 60 detroit, in 10th, I am doing about 1750rpm at 65mph. I never go over 65 anyway but I feel like that is a tad high rpm wise. Thanks! Link to comment Share on other sites More sharing options...
HERO Maker Posted October 23, 2017 Report Share Posted October 23, 2017 Nothing on your drivers door? Rocky & Sheri Rhoades '01 Volvo 770 2016 DRV Mobile Suites, HoustonHERO Makers Ministry Link to comment Share on other sites More sharing options...
CrazyCooter Posted October 23, 2017 Report Share Posted October 23, 2017 I found some new old stock parts on Ebay and was able to do the overhaul w/ gear swap on my single screw Eaton for about $500. I would expect $2000 + or - if you had a shop do the job with new parts. If you give us the trans model and tire size, it would be pretty easy to figure out the ratio. 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
Steve from SoCal Posted October 23, 2017 Report Share Posted October 23, 2017 Boneyard diffs run 350-600 with a 125-200 core generally no rhyme or reason. If there is none close by figure 150 shipping, well under 750 if you by on-line to your door. If you are singling the rear it is not much more to swap out the diff. https://www.vanderhaags.com/detailview.php?part=24593868 Swapping a diff in a big rearend is just like a smaller truck just heavier. Steve 2005 Peterbilt 387-112 Baby Cat 9 speed U-shift 1996/2016 remod Teton Royal Atlanta 1996 Kentucky 48 single drop stacker garage project Pulls like a train, sounds like a plane....faster than a Cheetah sniffin cocaine. Link to comment Share on other sites More sharing options...
BlueLghtning Posted October 23, 2017 Report Share Posted October 23, 2017 On 10/22/2017 at 7:22 PM, jcsteele said: So whats the real cost here? I have heard all sorts of numbers thrown around.... I am a little bit more of a budget-friendly sort of HDTer so I am not above finding a rear end on Craigslist or the likes and swapping it in but how the heck do I know which ones will fit?? I am not 100% sure what my current gears are but with my series 60 detroit, in 10th, I am doing about 1750rpm at 65mph. I never go over 65 anyway but I feel like that is a tad high rpm wise. Thanks! My truck says it's 3.58 rear end on the door and currently has low pro 22.5's. I run about 1500rpm's at 67mph in 10th, about 72mph at 1600rpm's, also with a detroit. Dan (Class of 2017) - 2012 Ram 3500 & 2005 Alpenlite Valhalla 29RK Contact me at rvsolarconsulting.com or Two Wheel Ramblin Link to comment Share on other sites More sharing options...
GlennWest Posted October 23, 2017 Report Share Posted October 23, 2017 Interesting topic. Know mine gets like 7ish mpg. Little better at 60. Top speed govenerd at 65. It still is better towing than my Chevy though. 2003 Teton Grand Freedom towed with 2006 Freightliner Century 120 across the beautiful USA welding pipe.https://photos.app.goo.gl/O32ZjgzSzgK7LAyt1 Link to comment Share on other sites More sharing options...
Brad & Jacolyn Posted October 23, 2017 Report Share Posted October 23, 2017 Your ratio should be listed on the door sticker on the drivers side. Brad and Jacolyn Tucker the Wonder dog and Brynn the Norfolk Terrier 2009 Smart "Joy" 2004 VNL630 "Vonda the Volvo" 2008 Hitch Hiker 35 CK Champagne Edition VED12 465 HP, Freedomline, 3.73 ratio, WB 218" Fulltiming and loving it. Link to comment Share on other sites More sharing options...
jcsteele Posted October 23, 2017 Author Report Share Posted October 23, 2017 I will double check when I get back to the truck but I do not remember seeing it on the door sticker. There is a tag on the diff that, in amongst other numbers, says 4.10xxx but I recently chatted with someone that has the same 9spd direct, 295 22.5's, and 3.36's that runs 1700ish at 65. I know there are variables but 3.36 is a looonnnnggggg way from 4.10. I just know that I would love to be around 8mpg (at least) but I think 1750 cruising and a 375 hp series 60 is probly not the best combo for that. Lol And for whoever was asking, its a 11.1 S60 with a Spicer 9 spd and 295/75/22.5 rubber Link to comment Share on other sites More sharing options...
Wrknrvr Posted October 24, 2017 Report Share Posted October 24, 2017 Maybe try swapping tires sizes. Especially if your tires are getting to need to be replaced. Just a different perspective,. Vern Link to comment Share on other sites More sharing options...
Jeff.Sloan Posted October 24, 2017 Report Share Posted October 24, 2017 I had a 3.58 rear end. Put in a freshly rebuilt 3.07 locker at Vaander Haags in Sioux Falls. It was around $2,500 out the door I think (red wine and age makes the memory a little blurry hahah). I have nearly new nice 24.5 tires on aluminum wheels on the truck that I'd be open to trading for similar 22.5s if anyone is looking to get bigger rubber but doesn't want to spend $$ 2004 Volvo 630, Cummins ISX, Eaton 10 speed (air assist clutch), 3.71 3.07 rear locker, ET jr, 200" WB, GearMaster 2017 Forest River Sierra 372LOK Full time June 2017 DW, 2 kids, and 2 dogs Link to comment Share on other sites More sharing options...
CrazyCooter Posted October 24, 2017 Report Share Posted October 24, 2017 So IF you have an overdrive 9spd with a OD of .73 and a 4.10 differential ratio......You would be right at your current 1650@65mph. Now the trick is where is the torque peak/efficient cruise rpm for the 11.1 S60? What cruise speed do you want to gear for? With just a 9 spd, those gears are only going to get closer together with a taller differential ratio. Example: 3.55 ratio is 1650 in 8th @ 55 mph and 1425 in 9th at 65mph How much high speed while unloaded? What is your target towing speed? What about a 3.21 ratio..... for 1490 in 8th @ 55mph, but just 1385 in 9th @ 70mph? This way you run direct while loaded and OD only while loaded. 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
Dollytrolley Posted October 24, 2017 Report Share Posted October 24, 2017 Guyz , Crawl under the truck a copy down the model number of your tranny.....then look up ALL ratios of ALL the gearz...... Example:. Our old shaker did dual-duty as a heavy-sometimes-grain-hauler with a 105,500 permit.....so first FIVE gearz just gets yo across the intersection.... gears 6 &7& 8 are nice to blow by $uper-pickups on the Davis-grade and 9 is a fairly nice spot in the 50 to 60 range and 10 is warp-$peed......we have 3:08'$ and s hellish high-reverse gear that I do NOT like......reverse is a pain in the @$$...... Maybe I need to install a four-$peed brownie then I would have......hummmm only 36 gears forward and 8 speeds in reverse...... Drive on.......(paint blisters in.....reverse) .. 97 Freightshaker Century Cummins M11-370 / 1350 /10 spd / 3:08 /tandem/ 20ft Garage/ 30 ft Curtis Dune toybox with a removable horse-haul-module to transport Dolly-The-Painthorse to horse camps and trail heads all over the Western U S Link to comment Share on other sites More sharing options...
Av8r3400 Posted October 24, 2017 Report Share Posted October 24, 2017 Love my 12 speed ishift, now with 4 (!) reverse gears! Anywhere from creepy crawley to warp drive. (Non overdrive and 2.47 rear end, still wishing it had a locker $$) Av8r34002012 Volvo VNL 730 D13 iShift & 2021 Grand Design Momentum 397TH I'd rather die trying to live - Than live trying not to die. -Leonard Perry Link to comment Share on other sites More sharing options...
CrazyCooter Posted October 25, 2017 Report Share Posted October 25, 2017 12 hours ago, Dollytrolley said: Guyz , Crawl under the truck a copy down the model number of your tranny.....then look up ALL ratios of ALL the gearz...... Example:. Our old shaker did dual-duty as a heavy-sometimes-grain-hauler with a 105,500 permit.....so first FIVE gearz just gets yo across the intersection.... gears 6 &7& 8 are nice to blow by $uper-pickups on the Davis-grade and 9 is a fairly nice spot in the 50 to 60 range and 10 is warp-$peed......we have 3:08'$ and s hellish high-reverse gear that I do NOT like......reverse is a pain in the @$$...... Maybe I need to install a four-$peed brownie then I would have......hummmm only 36 gears forward and 8 speeds in reverse...... Drive on.......(paint blisters in.....reverse) .. I do notice quite the difference in the reverse gear between my 3.90's and the 3.36's and it's not in the good direction. Can't imagine having 3.08's or taller! 1999 Peterbilt 385 C12 430/1650 13spd 2006 Dodge 3500 DRW 4x4 2010 Hitchhiker Champagne 36 LKRSB Link to comment Share on other sites More sharing options...
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