Exile Posted September 24, 2018 Report Share Posted September 24, 2018 Looking at a truck with some crazy low rear end, something like 4.33 or lower, and it has full lockers. (But price is low enough to put money into it) if i change the gear ratios, would i end up removing the lockers? Or is the locking mechanism separate from the gears? Thank you 98 379 with 12.7 DD LG Dodge w/5.9 CTD Chrome habit I’m trying to kick. Link to comment Share on other sites More sharing options...
Showme Posted September 24, 2018 Report Share Posted September 24, 2018 What is the transmission? If it is an overdrive the rears may work without mods. Volvo VNL / Missouri Titled RV Ved12 425HP Super 10 Spd 37ft KOA Fifth Wheel Jeep Rubicon Toad Link to comment Share on other sites More sharing options...
Darryl&Rita Posted September 24, 2018 Report Share Posted September 24, 2018 Separate. I have been wrong before, I'll probably be wrong again. 2000 Kenworth T 2000 w/N-14 and 10 speed Gen1 Autoshift, deck built by Star Fabrication 2006 smart fourtwo cdi cabriolet 2007 32.5' Fleetwood QuantumPlease e-mail us here. Link to comment Share on other sites More sharing options...
noteven Posted September 24, 2018 Report Share Posted September 24, 2018 Hi Exile - try a gearing and speed tool that you can discover speeds for a given set of trans and rear axle ratios and tire size. Ratio calculator Some more info about the truck you like, how many miles/yr you drive, where, and how heavy you ever want to be would be handy re giving you ideas around the gearing. The “interaxle” lock on a tandem locks the front and rear drivelines together through the front drive axle “power divider” which is a differential. Axle diff locks lock the wheels together on the same axle. Diff lock axles usually have different axle shafts vs open diffs. You can do a ratio swap “later” if you can’t live with the specs - but everything else about the truck fills the bill. That truck will pull grades and push great big 3 axle trailers backwards up hill around corners really nice. "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
beemergary Posted September 24, 2018 Report Share Posted September 24, 2018 Need to know the final drive of transmission. Some may be 1-1 ratio but others have one or two overdrives. With 4.33 I would want a double over. I have a single over with 3.90 and run 1750 rpm @ 65 mph. I am sure the old cat would like less rpm's but never a problem for close to a million miles. I only drive 60-65 mph. Get the info and do the math for rpm @ mph or do it backwards if tach and speedo are correct. Tire size (diameter) = circumfrence-inches-5280 ft.? mi. etc. also plays a role. Link to comment Share on other sites More sharing options...
Exile Posted September 24, 2018 Author Report Share Posted September 24, 2018 Yeah, i looked for the ratio, but didn’t find it. this truck has full differential lockers -and the interaxle lock, my apologies for not being clear. driver said it would do 80 at 2100 rpm, so maybe it has an overdrive. Looks like .79 is the ratio for a 15 speed overdrive- which would be a 3.55 rear end with 37” tall tires and 2100 rpm at 82 mph. xmission is a 15 speed, didn’t see the model number posted anywhere to look it up, or see if it ended with an “o”. Yeah, with the 15 speed, it will pull anything up a hill. Slowly. Nice for hitching up. thank you. 98 379 with 12.7 DD LG Dodge w/5.9 CTD Chrome habit I’m trying to kick. Link to comment Share on other sites More sharing options...
Randyretired Posted September 25, 2018 Report Share Posted September 25, 2018 Our HDT has 2 lockers and it has been great. We boon dock and have encountered some difficult conditions. We have been able to pull out of some areas our friends needed 4x4 to move with trailers. We also have a fair amount of weight on the rear axles. Turning in difficult conditions when both axles are locked is interesting though. Randy 2001 Volvo VNL 42 Cummins ISX Autoshift Link to comment Share on other sites More sharing options...
beemergary Posted September 25, 2018 Report Share Posted September 25, 2018 Couple times have got my dual axle Pete high centered from the crown in my road with no weight. One tire spins on front axle and one on back. I carry a couple short 2x8's to jam under tires just in case. Did this backing up to turn around to connect trailer. Link to comment Share on other sites More sharing options...
noteven Posted September 27, 2018 Report Share Posted September 27, 2018 15 speed / deep reduction / lockers / boondocking- yesssss "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
CrazyCooter Posted September 27, 2018 Report Share Posted September 27, 2018 Tires are likely 41"+ tall. 42", 4.33's, .79OD, and 80mph is 2200 rpm. 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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