Visit The Dirt Forum for More Information

Author Topic:   GM Mini Spool questions
Speed Racer X
Dirt Full Roller

Total posts: 61
posted February 27, 2003 10:04 PM
We are running a GM 7.5 inch, 10 bolt rear end. We have tried welding the spider gears but in 1 or 2 races they would break loose, so we bought a Mini Spool from MidWest Motorsports and ran it about 1/2 of the season.
We had the cover off the rear end to look at things the other day and pulled the Mini Spool to look at it. It was shot!!!
When it was new, the side pieces (that replace the side gears)had a square notch cut in them, that received the square pieces that held the pin that goes into the carrier. When we took it out the square notch was destroyed, it had close to 1/4 inch of slop.
What did we do wrong?? Has any one else had this problem?? Thanks for the help.

Dirt Maniac

Total posts: 199
posted February 27, 2003 10:20 PM
speedracer x call me if you can, 863-607-5071. SLEEPY

Dirt Forum Champ
Total posts: 564
posted February 28, 2003 08:25 AM UIN: 25419780
I have always ran a 10 bolt welded spiders and never had a prob.. never ran a spool..

RC Racing
Dirt Maniac

Total posts: 144
posted February 28, 2003 11:48 AM
Speed (hope you don't mind me addressing you by your first name), I'm with the Pickel: put a GOOD weld on the spiders. We go a step further and weld the axles gears in place too. Little bit more rotating mass, but a much more solid carrier assembly.

Regarding mini-spools: haven't used 'em,but have heard numerous complaints with spools that over a period of time the holes tend to "waller" out, therefore allowing for play in the assembly.

Added bonus with welds over spools: less $s

Good luck


Dirt Full Roller

Total posts: 56
posted February 28, 2003 10:07 PM
be careful with basic wire welders, the welds look good but are soft enough to wear out quickly under that extreme pressure

Light it up, Baby!

Dirt Forum Champ
Total posts: 620
posted February 28, 2003 10:15 PM
bobaluuu is correct. the best way to weld the spider gears is with a stick welder and a high nickel rod.

Dirt Full Roller

Total posts: 42
posted March 01, 2003 09:00 PM
It's also good to heat the area to be welded with a torch right before welding...

Dirt Full Roller

Total posts: 67
posted March 12, 2003 04:49 AM
SpeedRacer... Did you mic the gear in your rear end? If not thats why, they wore out.

Speed Racer X
Dirt Full Roller

Total posts: 61
posted March 12, 2003 06:47 PM

Gordon3E; I'm not exactly sure what you mean by "mic the the gear", but we did set up the ring and pinion to factory specs.
After doing some research, (Thank You Sleepy Gomez!!!)we found 2 possible problems.
#1 was the spool was made out of a pretty soft material (a file will cut it very easily).
#2 Possibly too much side clearance. We used the factory shims between the side gears and carrier and every thing seemed OK. We bought a new Mini-spool (different brand) and it fit much tighter, with no shims it took a brass drift and a small hammer to assemble it. Now the axles have virtually no side play.
Also took the file to the new Mini-spool, it is made out of a much harder material.
I think what happened is we got a $100 lesson. Thanks again for all the help: Speed Racer X

Back to the Archives