Rear axle traction devices - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 10-19-2009, 01:27 AM Thread Starter
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Rear axle traction devices

I am looking at upgrading my rear limited slip to either a detroit locker or a spool. The reason I am looking at a spool is i have heard that a detroit locker can cause bucking when it locks or unlocks, but that was in Jeeps. I was wondering where I can get a spool for the rear. Most of my driving is on the interstate or in the mud at the farm. How much does a spool affect the turning radius?

Thanks Zac

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post #2 of 8 (permalink) Old 10-19-2009, 01:31 AM
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If you're worrying about driveability of a locker, a spool is the absolute last type of rearend you'd want...

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post #3 of 8 (permalink) Old 10-19-2009, 01:45 AM Thread Starter
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I am not really worried about drivability with the spool. I know it will cut down the turning radius, but I have read nothing good about a detroit locker when install in a Jeep. Mainly causing erradic lane changes when installed in a CJ or wrangler.

I'm Zac

2003 F-250 6.0 Powerstroke, Torqueshift, 4x4
Crew Cab, Shortbed, Dark Red Exterior; Tan Interior; H-11 Headstuds; Tuned by Innovative Diesel; MBRP down pipe straight into a 6 inch Grand Rock miter stack; Airaid Intake; Isspro Trans temp, Fuel pressure, Boost, Pyro gauges; EGR Cooler Deleted; Pro Comp 3in leveling kit and F-350 blocks out back; Eagle Alloy 114 wraped in Nitto Terra Grapplers; Ranchhand brushguard; Custom Traction Bars; Recon Smoke Cab Light and Third Brake Light;Pioneer CD Player and XM radio; and a "THE DIESEL GARAGE" sticker in the back window.

Black Betty: 1981 Jeep CJ7 258 I-6, 4 spd, Headman Header, Comp Cams MSD ignition, Motorcraft 2100 Carb, 2in of lift, 30in Swampers, Lincoln Locked rear.

Scrappy: 1975 Jeep CJ5 258 I-6, 3 spd,Headman Header, Motorcraft 2100 Carb, Full MSD ignition, Stretched 14 inches, 4 inches of lift, 33 inch tires, Lincoln Locker rear


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post #4 of 8 (permalink) Old 10-19-2009, 11:56 AM
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i would get a detroit tru trac or a detroit locker

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post #5 of 8 (permalink) Old 10-19-2009, 02:16 PM
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All the bad things you read about a Detroit Locker are going to be 10x worse with a spool.

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post #6 of 8 (permalink) Old 10-25-2009, 06:11 PM
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Zac,

You DO NOT want a spool, it will make it DIFFICULT to turn, not just increase the turning radius. Have you ever locked the diff on a tractor then tried to turn it? Nothing doing right, same with a spool, except you CAN'T unlock it, ever.

I prefer a LSD (Limited Slip Differential) to any form of locking diff, but that is MY preference and one not shared by people who off-road and understandabally so.

Reference: http://www.reiderracing.com/index.php?cPath=5850

Reider racing KNOWS differentials, lots of stores sell them, Reider KNOWS them.

For similicity, not much beats a PowerTraxx. They are 100% locking but offer excellant turning charecteristics and are not wear-prone. They lock completely so are not a good option for high power vehicles at the drag strip, they tend to break other driveline parts or explode themselves on occasion. They are excellant, IMO, for most (farm) truck applications where you don't have a lot of power or traction and just need both rears pulling.

The Eaton is a cone-clutch type LSD that offers excellant durability and is relatively easy to install, they are NOT rebuildable but subject to high wear rates in mud.

The Trac-Lok is the Ford clutched LSD system and while it is an EXCELLANT solution for vehicles needing occasional added traction (mud, snow, sand) and for boat ramps it is NOT suited to frequent severe use (off-road) but is rebuildable - easily in housing. This is MY preference for what we do with our vehicles.

The Trutrac is a GEARED LSD that provides exactly the same Tq to both wheels, it will take a LOT of punnishment but again is not well suited for frequent off-roading and not at all for rock-climbing.

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Last edited by John_G; 10-25-2009 at 06:14 PM.
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post #7 of 8 (permalink) Old 10-27-2009, 03:11 AM
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Why not get an air locker. Locked when you want it, not locked the rest of the time. There is also that Ox locker. I am not sure they make them for rear axles though.

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post #8 of 8 (permalink) Old 10-30-2009, 02:46 AM
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Quote:
Originally Posted by powerstroke2003 View Post
I am looking at upgrading my rear limited slip to either a detroit locker or a spool. The reason I am looking at a spool is i have heard that a detroit locker can cause bucking when it locks or unlocks, but that was in Jeeps. I was wondering where I can get a spool for the rear. Most of my driving is on the interstate or in the mud at the farm. How much does a spool affect the turning radius?

Thanks Zac
A spool will 'chirp' ( drag a wheel ) on most turns of the wheel, if the stagger on the rear wheels is not matched then one wheel gets dragged down the pavement. Worst of all is the rear following the wind on ice when changing speed.

All of the dividers will slip on ice except the mechanical locks and the bias ones like OX and Torsen. When set up right the Detroit will snap and step ahead on the outside wheel but I have driven ones that chirp like a spool and yank up the inside wheel, that is the thing that gets an 18 in stepover when it clicks at the wrong time, like a lane change.

ARB was the best that I have driven, open for normal use and coasting down the pavement, get stuck on a cowpattie and flip an air switch for real 4 wheel drive.

keydl

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