GM 8.5 mini spool

JWagner · 09-07-2014, 11:49 AM

Anybody run a mini spool in a 8.5 GM rear end? Will they survive in a low horsepower stocker?

Bob Shaw · 09-28-2014, 08:30 PM

They are recommended for dirt track cars only. I don't know why.

Mark Yacavone · 09-28-2014, 10:42 PM

J,
A posi-traction will survive in a low hp automatic Stocker. I don't see why a mini spool wouldn't.

cad · 10-04-2014, 09:50 AM

I believe a mini spool is not legal in NHRA. You are also required to have aftermarket axles when running a spool.

Ron Middleton · 10-10-2014, 02:07 PM

When I bought my H or J/SA 1980 Camaro it had a mini spool in it and had hundreds of passes on it without failure.

pbp1 · 10-10-2014, 02:37 PM

It may last, but it is more prone to failure because with a mini-spool, all the load from the ring gear to the axles is transmitted only through the pin, to the bore in the cast case. With a posi unit, most of this load is transmitted through the clutches, into the inside of the case.

55 zimm · 10-10-2014, 04:02 PM

I ran a 8.5 ten bolt mini spool in a 87 firebird 3200 lbs bracket car. the car ran 11.17 122mph 1/4 mile 7.08 99mph 1/8 mile with a trans brake. We had over 100 passes at those time with no problems. I would not say that they are bullet proof but if you foot brake with low hp it should last a long time.

09-07-2014, 11:49 AM	#1
JWagner Junior Member Join Date: Oct 2013 Location: Winfield, Kansas Posts: 37 Likes: 14 Liked 17 Times in 4 Posts	GM 8.5 mini spool Anybody run a mini spool in a 8.5 GM rear end? Will they survive in a low horsepower stocker?

09-28-2014, 08:30 PM	#2
Bob Shaw Member Join Date: Jan 2002 Location: Sedalia, Mo Posts: 427 Likes: 280 Liked 290 Times in 58 Posts	Re: GM 8.5 mini spool They are recommended for dirt track cars only. I don't know why. __________________ Bob Shaw V/SA 515

09-28-2014, 10:42 PM	#3
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,414 Likes: 2,579 Liked 4,447 Times in 1,693 Posts	Re: GM 8.5 mini spool J, A posi-traction will survive in a low hp automatic Stocker. I don't see why a mini spool wouldn't. __________________ We are lucky we don't get as much Government as we pay for..... Will Rogers

10-04-2014, 09:50 AM	#4
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 673 Likes: 140 Liked 72 Times in 40 Posts	Re: GM 8.5 mini spool I believe a mini spool is not legal in NHRA. You are also required to have aftermarket axles when running a spool.

10-10-2014, 02:07 PM	#5
Ron Middleton Member Join Date: Jan 1970 Location: Jackson, Ms. Posts: 350 Likes: 183 Liked 10 Times in 4 Posts	Re: GM 8.5 mini spool When I bought my H or J/SA 1980 Camaro it had a mini spool in it and had hundreds of passes on it without failure. __________________ #4892 J/SA. We are what we repeatedly do. Excellence then, is not an act, but a habit.” - Aristotle

10-10-2014, 02:37 PM	#6
pbp1 Junior Member Join Date: Mar 2013 Posts: 78 Likes: 11 Liked 18 Times in 5 Posts	Re: GM 8.5 mini spool It may last, but it is more prone to failure because with a mini-spool, all the load from the ring gear to the axles is transmitted only through the pin, to the bore in the cast case. With a posi unit, most of this load is transmitted through the clutches, into the inside of the case.

10-10-2014, 04:02 PM	#7
55 zimm Junior Member Join Date: Sep 2009 Posts: 5 Likes: 0 Liked 0 Times in 0 Posts	Re: GM 8.5 mini spool I ran a 8.5 ten bolt mini spool in a 87 firebird 3200 lbs bracket car. the car ran 11.17 122mph 1/4 mile 7.08 99mph 1/8 mile with a trans brake. We had over 100 passes at those time with no problems. I would not say that they are bullet proof but if you foot brake with low hp it should last a long time.

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