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Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend> difference/pros/cons of spool and mini spool?
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Topic Review (Newest First)
03-03-2006 10:42 AM
351fairlane I would just go with the full steel spool. Then everything is all one piece and stronger. Mini spools will work and i have seen many used in several applications. Just my two cents. Lets see some pics of the car when its done.
03-03-2006 10:14 AM
1931 steve
Originally Posted by sicksixseven
Being a member of the offroad community too allows me to look at this question a little different. If you plan on doing a mini spool, forget that, weld it up. If you want a full spool, forget that, weld it up. Sam
Being that I am coming from an off road community, I too can comment on this. I ran timed mud bogs for a few years. The difference between mud bogs and drag strips ar night and day. Mud bogs you want tire spin to keep the tread clean, drag strip you want no (or very little) tire spin. The traction (stress on parts) is totally different between the two, so don't even try to compare them. Now as far as welding your spiders together to lock up the diff, thats just asking for trouble. If that was the best way to go why would so many manufactures sell locking units? Im sorry sicksixseven, welding in not the way to go, nor is it at all safe, you have just avoided the bullet if that is what you have done. You time is coming, just hope nobody gets hurt.

03-03-2006 09:01 AM
Originally Posted by lowROLLERchevy
^^^ im 26, do i ount as "older" ? lol

please say no
Naw, Centerlines right, yer just a yungun!!

Do you FEEL older? If not, you will.
03-03-2006 06:52 AM
Originally Posted by lowROLLERchevy
^^^ im 26, do i ount as "older" ? lol

please say no
Naw, yer just a young pup.
03-03-2006 06:50 AM
lowROLLERchevy ^^^ im 26, do i ount as "older" ? lol

please say no
03-03-2006 06:40 AM
M&M CUSTOM More "advice" on welding a diff for the street and I WILL lock the thread.

We maintain advice for the sake of general safety around here when at all possible.

Then you get another mention of the stuff we older, more experienced members, completely rule against, and the reminder has to be posted again.
03-02-2006 11:17 PM
"70" Cougar Welli guess ive come up on one of the big dogs eh.. well sure if i have any more questions on the subject ill be sure to stear clear of the " w.....g" subject even thow i havent realy said i was gonna do it or intended of doing it, or even thinking of it. next topic i guess

03-02-2006 11:05 PM
lowROLLERchevy welding them migth be fine in the ofroad setting, but your also not dealing with the as much stress as you are when you launch a 3500 lb car out of lights at the track

hardened materials like spider gears should NEVER EVER be welded for racing situations

ever seen a spider gear shatter under extreme stress, exit thru the back of a ford 9 inch housing, and implant itself into the pavement ?

thats enough force for the fragment to have shattered a leg bone if it had come out parallel with the gound. race track officials dont go to work willing to be shot by your car just because you decided to save $200

NOW i think its time to lock this thread. sorry cougar, but i think you know who you can PM if you need more information. either that or strat a new thread with specific questions so that the welding idea id specificly excluded from being a posible response

something like "ive narrowed it down to XXX brand mini spool and XXX spool, and was curious blah blah balh"
03-02-2006 06:53 PM
Originally Posted by sicksixseven
.......People can say that they will break, that they will cause damage, but I can attest to the fact that they don't. .......
I'm amazed that at the ripe old age of 19 and with your vast experience (most likely measured in months) in the automotive world that you speak with such authority. Must be a prodigy of some kind.
03-02-2006 06:20 PM
"70" Cougar hey thanks sicksixseven if it helps its a 9 inch for a '70 Mercury Cougar with 28 spline axles .

03-02-2006 06:07 PM
sicksixseven Being a member of the offroad community too allows me to look at this question a little different. If you plan on doing a mini spool, forget that, weld it up. If you want a full spool, forget that, weld it up. People can say that they will break, that they will cause damage, but I can attest to the fact that they don't. I have run a welded rear and a welded front and never had a problem. If you want a lunchbox style locker, look into an Aussie. See them here: . I am not sure what axle you are running, but they have them for most any application. I wouldnt waste my time or money on a full Detroit, way too much, and they break if you break an inner. The Aussie is by far the best lunchbox style, meaning that it replaces the spider gears in the carrier with the locking mechanism. See install here: . I have two of them for my Toyota once I get the time/effort/motivation. That's about all I can think of. Good luck with your choice.

03-02-2006 05:24 PM
"70" Cougar i appreciate the info and suggestions of lockers and limited slip diffs. im on my way to making some good pass's at the strip . Now could use instructions on how to install a locker .. the type that fits inside the ring gear. thanks again guys keep the good calls commin !(y)

03-02-2006 08:27 AM
malc Ive had one of these Powertrax
syatems in my Camaro for many years now and it works great.
Clicks a little going round tight corners but does the job in a straight line.
It was the best solution for me as the ring and pinion stay in place during installation.Got it from Summit.
03-02-2006 07:19 AM
farna You don't need big tires to put a big strain on the axles and gears. When you turn, the inside wheel wants to run around something like a 14' radius, and the outside wheel around a 19' radius (depends on size of vehicle, but 60" track is average). This makes the two axles "fight" each other -- the outer wants to go faster, the inner slower. So the axles try to twist and the tires grind each other down. Whichever is weakest loses, but all parts get a lot of strain. Nothing will break right away, but the added strain will cause a lot quicker failure -- something WILL eventually break, and when it does, it will be catastrophic.

Ever seen or heard a car snap an axle? I've been close by when it happened at a dirt track -- welded differential broke in the pit area when the guy was turning the car around. We thought someone had fired a shot gun! Needless to say, no racing for that guy that night. A spool (or even mini spool) would hold up a bit better than welded spider gears due to the heat caused by the welding. That just means the spool/mini would cause a bigger bang when it broke.

The solution is a locker for street/strip use. If you don't like the ratcheting noise of a limited slip, get something like an air locker made mainly for 4x4 vehicles. Those lock on demand, and are really safer than a limited slip. Even limited slip is dangerous on slippery surfaces (wet, icy, loose sand, etc.). Once the wheels lock it's just like a spool -- the car will slide sideways with both wheels spinning and the driver has less control over the vehicle. The air locker only locks when you ask for it.

A local rodder with a blown 350 in a 'glass 32 decided to see if he could break the wheels loose at 50 mph in high gear, so he floored it. Sure will break them loose! Slid sideways and went off the road, causeing a little frame damage. Luckily just the running board and fender on one side were destroyed, and a slightly bent frame -- no people damage (except for some clothes...). With a "one legger" only one wheel would break loose and the other would maintain enough traction to keep the car from sliding sideways.
03-02-2006 07:10 AM
lowROLLERchevy ^^^^ good attitude

plus, hitting the wall at the track causes ALOT less damage then hitting a house or a grove of trees, not to mention all the other things that can go wrong w/ wrecking on the street
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