locking rear diff question - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 06-05-2012, 09:22 AM Thread Starter
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locking rear diff question

Is there anyway to defeat the 20 MPH limit imposed by the computer? I dont want to drive around with it all the time but would like the option.

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post #2 of 8 Old 06-05-2012, 01:26 PM
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Only way I can think of is to wire it to the upfitter switches, bypassing the computer all together.

I don't think it'll disengage at 20mph, it just won't engage above that.

Mine is out, hated that thing, went to a Truetrac. Much better.

2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.
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post #3 of 8 Old 06-06-2012, 01:21 PM
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personal opinion....

I accidently left mine engaged, the rear tires leave marks on the asphalt when engaged on a corner... it locks up the rear end real good. I only use mine when having fun not wanting to slip my right rear, or on soft surfaces...

Driving: 2011 Pale Adobe...F-350 CC 6.7 FX4 3:55-Locking Rear End-Dual Alternators-premium Lariat, moon rf, added wheel flares, 2-tone black base

Picked up 4/29/10 as of 06/20/2012 109,000+miles
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post #4 of 8 Old 06-07-2012, 04:39 AM Thread Starter
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I had the limited slip in my 6.4 and never knew when it would work. Sometimes it was great others it was a one legged dog. I like the selectable much more with the exception of the 20 MPH limit. If it stays engaged once locked then its fine. I would never use it other than boat ramps and street fights.
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post #5 of 8 Old 06-07-2012, 06:10 AM
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Well, personally I love the Truetrac for street use. It's hooked up all the time.

If you are going to offroad a lot the TT isn't for you, one wheel in the air it becomes an open diff.

But on the street the performance is unmatched. It's very predictable and even if you do make the truck 'step out' it's controllable and predictable.

I've been running a TT for nearly 20 years now and the street performance is excellent in all conditions wet/dry/ice.

The only Achilles heel the TT has is it's wheel-in-the-air problem where it becomes an open diff.

IMHO the 'ultimate' diff would be one that is a TT with a eLocker. Run TT mode 99% of the time and lock it when crossed up. Sadly no such thing exists.
Sidebar: Jeep is making a LS diff w/ an eLocker. Cool!

Torsen (the original designer of the TT) has a new -R Torsen diff which supposedly solves the wheel in the air issue. Sadly, it's not avail for our trucks. Biggest thing it's avail for is a 9 inch.

I did not like the Ford eLocker. Not because of anything bad about it, but the nature of an open diff does not agree with me after 20 years of having the traction of a TT. With the TT in there now it's a whole different truck. Very planted and hooked up.

2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.
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post #6 of 8 Old 06-07-2012, 08:27 AM
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The one wheel in the air traction issue can usually be cured by feathering the brakes and power at the same time.

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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post #7 of 8 Old 06-14-2012, 08:00 AM
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I have never had a lot of luck using brakes to get the TT to lockup. Even with the ebrake on the Toy (which is pretty stout) I never got much from it. YMMV

Happy w/ the TT in the Ford.

2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.
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post #8 of 8 Old 06-14-2012, 01:55 PM
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Yah it can take a bit of luck to get it to grab sometimes.

SCT, no studs...yet, Dual OEM intake air filter housings, Banks intercooler & intake elbow, Banks exhaust system, Windrunner ported intake manifold, Bullet Proof Diesel remote oil cooler & thermostat, AirDog2 (plus a couple spares), Power steering filter (Amsoil dual-bypass), MagTec deep ATF pan, Electric oil pre-lub pump, Dakota Digital gauges.
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