| Eaton ELocker Installation April, 2003 Copyright 2003, see disclaimer below Special Thanks to Dave Breggin for his help, guidance, patience, and expertise |
| Project: Install New Eaton ELocker Front & Rear of a '99 Hummer. Parts List/Source (costs are aproximate): -Qty 2 Eaton ELockers/Lynch Hummer $2,000/ea. -4 Qts AMG #5745569 Gear Oil 75w90 w/ Friction Modifier/Lynch $18/qt -Qty 2 Eaton wiring harnesses/Lynch Hummer $45/ea -Qty 24 Half Shaft bolts w/ Nord washers/Lynch Hummer $.70/ea -Qty 4 Differential Output Seal/Lynch Hummer $4/ea -Qty 2 Safety switches, indicator lights/Radio Shack, McGuckins Hardware (Boulder, CO) $30 -Qty 4 Brake Pads (Dave B.) $130 -Misc: Blue Locktite, Red Locktite, Blue RTV Gasket Maker, primary wire, brake cleaner, brake caliper guide pin lubricant, panel to mount switches (painted flat aluminum sheet stock, screws), connectors, wire loom, black satin-finish spray paint/Auto Parts Store -Lots of tools including a torque wrench capable of 196 lb.ft., 3 Ton Jack, Ratcheting box-end wrenches, Snap-on Brake tool #RTB18, Brake pad compressor, etc, etc... |
| Lessons Learned -Apparently I was fortunate to obtain the lockers. I've been told AMG is no longer filling orders. When Tractech comes out with an AMC20 limited slip electric locker (Detroit Electrac), that may end up being a lower-cost and more readily available alternative. -Polarity matters. The yellow wire from the dif is hot, brown is ground. -Required sepcial lubricant only available only from AMG -You'll need to obtain all of the items listed above. The lockers that I purchased did not include any documentation, output shaft seals, half shaft bolts, wiring harness, lubricant, switches, etc. -This is a good time to replace brake pads if they are not brand new. -Power tools are of little help. This job is mostly done by hand -It took two of us a little more than two full days to do this project, or approx 40 man hours. Some of this was because we were planning and doing this for the first time. -Difs ship crated via truck freight and weigh about 90 lbs each. -Difs only draw about 4 amps each so we just hooked into the 20 amp cigar lighter circuit and added a 10amp circuit breaker between the switches and the hot wire. |
| The Process (follow published torque specs) 1. Remove Driveline Protection 2. Disconnct half shafts and rotors from Dif 3. Remove Brake Calipers (special Snap-on tool required to reach top bolt) 4. Secure Brake Calipers using coat hangers to get them out of the way 5. Disconnect drive shaft from dif 6. Unbolt and lower diff 1/2 way 7. Disconnect vent line from dif 8. Finish removing dif 9. Reinstall dif and attach ventline 10. Install half shafts w/ new bolts 11. Clean caliper guide pins & lubricate 12. Compress Brake pistons 13. Install new pads and reattach callipers 14. Reattach Rotors and half shafts to Dif 15. Fill Diff w/ AMG#5745569, 2 qts 16. Reconnect drive shaft to dif 17. Replace drive line protection 18. Attach wiring harness to dif 19. Run wiring to cab 20. Fabricate and assemble switch panel 21. Cut hole for switch panel 22. Wire & Install switch/light panel |
| The Product: Eaton ELockers -Shown with cover removed -Electronic Locking Differential, is apparently a limited slip when not engaged although I've seen no manufacturer data that fully explains how it works. -The springs shown may be for applying pressure to the limited slip clutch plates. |
| 4/24/03 |
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| Related Links |
| Pics from Eaton website but note there are no compression springs as shown in the picture at top of page |
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| The Results Preliminary observations to date: -Lockup occures quickly -Disengagement initially required backing up a foot or so but this seems to have smoothed out over time -No apparent effect on non-locked TT4 performance, works as normal -BTM works well. This was kind of a thrill having never experienced it previously in my '99 HUMMER -"Sweet!" per Dave. |
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| Control Panel in Cab |
| Old Torsen II Dif |
| Wiring Harness & Connector |
| Pix from Various Websites |
| From Expiditionexchange.com: photo of Eaton Limited Slip. Note the similar springs to Elocker at top of page |
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