Used to work in a Ford dealership and also a couple of private shops, did all of the gear work back then
Anymore, I'll pay someone else to do it, then if there is a problem they have to take care of it
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| Anyone change their own diff gears? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=104&t=82991 |
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| Author: | Kkjess [ Thu Sep 03, 2015 5:45 pm ] |
| Post subject: | Anyone change their own diff gears? |
I have done this before, but not on a jeep. Anyone have access to the specs?? Pinion preload rotating torque, end bearing cap bolt torque, specs on backlash, maybe the recommended shim starting points??? I ordered by gear set through JBA, do they include these instructions??? Thanks for any help/info. |
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| Author: | PALiftedKK [ Thu Sep 03, 2015 7:50 pm ] |
| Post subject: | Re: Anyone change their own diff gears? |
most of us have had a shop do it. there's so much that can go wrong with install. especially backlash. the shops will most likely warranty the work done and if anything breaks (as in how the hardware was installed) its on them. |
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| Author: | JeepMorrison [ Fri Sep 04, 2015 1:34 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
I do gears in my own Jeeps, but the FSM should have all the specs you want. Start there |
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| Author: | Kkjess [ Fri Sep 04, 2015 7:12 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
4x4kayak2112 wrote: I do gears in my own Jeeps, but the FSM should have all the specs you want. Start there dumb question, but what is FSM? |
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| Author: | CollinKK [ Fri Sep 04, 2015 9:56 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
Kkjess wrote: 4x4kayak2112 wrote: I do gears in my own Jeeps, but the FSM should have all the specs you want. Start there dumb question, but what is FSM? Factory Service Manual Sent from my VS880 using Tapatalk |
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| Author: | Bmxer524 [ Fri Sep 04, 2015 10:38 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
If you have experience and the know how to do it, then power to you. I don't mess with gears and trannys. There's too much to mess up and go wrong. I'd rather pay a pro and get a warranty on them. |
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| Author: | Mountainman [ Fri Sep 04, 2015 10:43 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
I think there's a link to the FSM in the noob guide. I have done my own gears. You might have to get a couple of Chrysler specific tools, like the one for the rear end that goes down the axle tube to tighten that disc that I can't remember the name of. The fronts are more strait forward. |
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| Author: | tommudd [ Fri Sep 04, 2015 12:55 pm ] |
| Post subject: | Re: Anyone change their own diff gears? |
Used to work in a Ford dealership and also a couple of private shops, did all of the gear work back then Anymore, I'll pay someone else to do it, then if there is a problem they have to take care of it
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| Author: | Kkjess [ Fri Sep 04, 2015 1:12 pm ] |
| Post subject: | Re: Anyone change their own diff gears? |
I too worked in a shop, spent 13 years working as a dealership tech for GM. I feel fairly comfortable doing the swap, but still would feel better about having all the factory specs. If I cant find them, than I guess I'll just pay to have the work done. There are 3 shops located close to my area that specialize in offroading. |
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| Author: | ajohns1288 [ Sat Sep 05, 2015 11:19 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
Here's specs for a 2008. Shouldn't change much though. Keep in mind you'll need a special tool for the rear bearing preload adjuster. OEM gears are marked with the pinion depth in thousandths to give you a starting point for the shims. REAR AXLE DESCRIPTION SPECIFICATION Axle Ratio 3.21/3.73 Differential Case Flange Runout 0.076 mm (0.003 in.) Differential Case Clearance 0.12 mm (0.005 in.) Ring Gear Diameter 213 mm (8.25 in.) Ring Gear Backlash 0.12 - 0.20 mm (0.005 - 0.008 in.) Ring Gear Runout 0.12 mm (0.005 in.) Pinion Torque To Rotate - Original Bearings 1 - 2.2 N·m (10 - 20 in. lbs.) Pinion Torque To Rotate - New Bearings 1 - 3.4 N·m (10 - 30 in. lbs.) TORQUE DESCRIPTION N·m Ft. Lbs. In. Lbs. Differential Cover Bolts 41 30 - Bearing Cap Bolts 135 100 - Ring Gear Bolts 122 90 - Pinion Nut Minimum 285 210 - Pinion Mate Shaft Screw 26 19 - Axle Damper 61 45 - Adjuster Lock Screw 26 19 - FRONT AXLE SPECIFICATIONS DESCRTIPTION SPECIFICATION Axle Ratio 3.21/3.73 Ring Gear Diameter 186 mm (7.33 in.) Ring Gear Runout 0.12 mm (0.005 in.) Ring Gear Backlash 0.12 - 0.20 mm (0.005 - 0.008 in.) Pinion Torque To Rotate: Original Bearings 1 - 2.2 N·m (10 - 20 in. lbs.) Pinion Torque To Rotate: New Bearings 1.7 - 2.8 N·m (15 - 25 in. lbs.) Total Torque To Rotate is Pinion Torque To Rotate plus: Gear Ratio 3.21 0.53 - 0.87 N·m (4.6 - 7.7 in. lbs.) Gear Ratio 3.73 0.45 - 0.75 N·m (3.9 - 6.6 in. lbs.) TORQUE DESCRIPTION N·m Ft. Lbs. In. Lbs. Ring Gear Bolts 108 80 - Differential Bearing Cap Bolts 54 - 68 39 - 50 - Drain Trough Nut 23 - 200 Differential Cover Bolts 19 - 26 14 - 19 - Pinion Nut 217 - 352 160 - 260 - Rear Axle Bracket Bolts 88 65 - Front Axle Brackets To Frame Nut 61 45 - Front Axle Bracket to Axle Nuts 61 45 - Right Axle Bracket Nut 61 45 - |
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| Author: | Mountainman [ Sat Sep 05, 2015 11:54 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
Preload adjuster, that's it. Best to weld up your own as they are way too much when you can cut the head off of the right sized bolt and weld it to a long rod... |
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| Author: | Kkjess [ Thu Sep 10, 2015 8:06 am ] |
| Post subject: | Re: Anyone change their own diff gears? |
Thanks for digging up that info ajohns1288 |
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