What is the difference between a locker and a spool? - Ford Mustang Forum

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post #1 of 3 (permalink) Old 12-11-2002 Thread Starter
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jeff90lx's Avatar
Joined: Aug 2002
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Question locker vs. spool

What is the difference between a locker and a spool? What does a spool do anyway?

Black 90lx Hatchback, Intake, headers,off-road H,40-series flows with dumps,Ford racing 3:73's with a richmond mini spool, Cobra racing wheels with 245zr17 yokamoto tires. Also ditched all smog and a.c. stuff, Black magic electric fan and aluminum water pump, Brand new world class t-5. Plenty more to come.

Last edited by ScottHalliday; 12-11-2002 at 10:31 PM.
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post #2 of 3 (permalink) Old 12-11-2002
EZBNME's Avatar
Joined: Dec 2002
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Spools are a solid link for both axles. Lockers are ratchet style with teeth that still allow corner turning on the street without damage to axles. Lockers are about the next best thing to a spool.

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post #3 of 3 (permalink) Old 12-12-2002
YodaFan1138's Avatar
Joined: Sep 2002
Posts: 49
There are several different modes of converting longitudinal (front to back) rotational motion to transverse (side to side) rotational motion, mainly in differential and non-differential apparati:

1. Differential- these include limited-slip, detroit locker, locker, open, etc. The meaning of "differential" is that (housed in the rearend) it allows the wheels to spin at different speeds, such as when going around a corner. The different names are simply defining the system of clutches, etc. that allow the driveshaft to articulate with the axles differently. Limited Slip differential read whether or not one side or the other is slipping and consequently delivers power to the other side. A locker rearend transfers power to both wheels all the time your foot is making the gas pedal feel familiar with the floor (similar to direct drive on roots-type supercharger applications; however, the locker will allow the wheels to spin at different rates so you can still corner without braking an axle). Open rearends can transfer power to both wheels, butwhen power-braking to do a burnout you'll only see one of the donuts makin' a cloud (occasionaly, both will spin due to force exerted on one axle by the other) I have an open rearend on my '69 Mach I, and I've done burnouts on both wheels before as well as one whell, then the other (the jist of the open rearend is that one wheel or the other will (usually) spin)

2. Non-differential= spool. Imagine a beefy, enlarged washer with a pipe running through it at a 90 degree angle- the axles fit into the "pipe" portion of our model, and the ring gear is bolted to the washer. The pinion makes contact with the ring and that's where the magic happens- all power is transferred to both wheels all the time direct-drive style; however, as the axles and thus wheels can't spin at different rates, you'll break an axle if you try to corner at a radius of less than about 50 ft (keep an eye on the super-stock and top fuel dragsters at the end of the 1320 and see how wide their trucks have to tow them around a corner). This type of rearend is STRICTLY for dragrace-only, straight-line applications.

If you want a massive amount of performance for the street and don't mind a slight clicking sound around the corners, the locker differential is for you. Open is the cheapest, and I can still spin both my tires going around a corner, however, limited slip will give you the benefit of both wheels spinning all the time (it's just that whole "taking power away" deal that gives me the willies...)

Sorry for talking your ears off, fellas; however, I've taken a lot of advice from the guys in this forum and thought I'd give a little back. Hope this helps and Happy Holidays! (so many H's...)

My other toy is a '69 Mach I
351W, .060 over, heavy exhaust cam, straight pipes--approx. 325rwhp
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