Stock class transmission case breakage

tracyjw · 06-09-2011, 12:50 PM

Recently, I have received a large amount of concern over automatic transmission case breakage and safety concerns. I am interested in finding out how much a problem this is in the stock class. Your comments are greatly appreciated.

Tracy Winters

Alan Roehrich · 06-09-2011, 12:52 PM

Not a problem for us. However, we already approached NHRA, they are unwilling to accept aftermarket cases in Stock Eliminator. Well, at least for the automatic transmission cars.

Richard Grant · 06-09-2011, 12:58 PM

The only time I have encountered trans case breakage was due to chassis flex. With a properly installed roll cage and proper bracing there should not be any case breakage. Solid motor mounts, rubber trans mount and no chassis flex should eliminated breadage.

Ron Middleton · 06-09-2011, 01:01 PM

I recently had this problem with the TH350 in my stocker. We never could figure out why the case broke like it did, but I called Wesley (Div. 4 tech man) and was told that OEM case only. It seems as though NHRA would rather leave it alone or move Stock into Superstock rather than allowing more superceded parts like trans cases.

Jim Kaekel · 06-09-2011, 01:01 PM

I've broken just one case in 30 years of racing and that was related to a U-joint failure....knock on wood!

Chris1529 · 06-09-2011, 01:01 PM

I agree. I think using the wrong type of mount would cause our cars the most trouble. On a related note, do the JW bellhousings with the 30.1 flex plate sheild rating require indexing?

X-TECH MAN · 06-09-2011, 01:05 PM

Quote:

Originally Posted by Ron Middleton

I recently had this problem with the TH350 in my stocker. We never could figure out why the case broke like it did, but I called Wesley (Div. 4 tech man) and was told that OEM case only. It seems as though NHRA would rather leave it alone or move Stock into Superstock rather than allowing more superceded parts like trans cases.

So NOW the NHRA does not want to allow better parts. It like closing the barn door after the cows have all left the farm !

tracyjw · 06-09-2011, 01:09 PM

Quote:

Originally Posted by Chris1529

I agree. I think using the wrong type of mount would cause our cars the most trouble. On a related note, do the JW bellhousings with the 30.1 flex plate sheild rating require indexing?

The bellhousing is SFI certified 30.1 for the flexplate shield and it fits onto the stock transmission case. You do not have to use an aftermarket transmission case. If I am correct the flexplate shield is required for vehicles running 10.90 or faster. I am not sure that I understand the question regarding the indexing? Let me know how I can assist you further.

Chris1529 · 06-09-2011, 01:33 PM

Tracy- PM Sent

Larry Curtis · 06-09-2011, 01:39 PM

Quote:

Originally Posted by Chris1529

I agree. I think using the wrong type of mount would cause our cars the most trouble. On a related note, do the JW bellhousings with the 30.1 flex plate sheild rating require indexing?

We index them. Have seen them off as far as .035". I'd rather be safe than sorry. $0.02
Larry

06-09-2011, 12:50 PM	#1
tracyjw Junior Member Join Date: Jun 2011 Posts: 8 Likes: 0 Liked 0 Times in 0 Posts	Stock class transmission case breakage Recently, I have received a large amount of concern over automatic transmission case breakage and safety concerns. I am interested in finding out how much a problem this is in the stock class. Your comments are greatly appreciated. Tracy Winters

06-09-2011, 12:52 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,090 Likes: 1,534 Liked 1,758 Times in 398 Posts	Re: Stock class transmission case breakage Not a problem for us. However, we already approached NHRA, they are unwilling to accept aftermarket cases in Stock Eliminator. Well, at least for the automatic transmission cars. __________________ Alan Roehrich 212A G/S

06-09-2011, 12:58 PM	#3
Richard Grant Member Join Date: Jan 2002 Location: West Monroe, La. Posts: 301 Likes: 9 Liked 13 Times in 7 Posts	Re: Stock class transmission case breakage The only time I have encountered trans case breakage was due to chassis flex. With a properly installed roll cage and proper bracing there should not be any case breakage. Solid motor mounts, rubber trans mount and no chassis flex should eliminated breadage. __________________ Richard Grant 4988 STK

06-09-2011, 01:01 PM	#4
Ron Middleton Member Join Date: Jan 1970 Location: Jackson, Ms. Posts: 350 Likes: 183 Liked 12 Times in 4 Posts	Re: Stock class transmission case breakage I recently had this problem with the TH350 in my stocker. We never could figure out why the case broke like it did, but I called Wesley (Div. 4 tech man) and was told that OEM case only. It seems as though NHRA would rather leave it alone or move Stock into Superstock rather than allowing more superceded parts like trans cases. __________________ #4892 J/SA. We are what we repeatedly do. Excellence then, is not an act, but a habit.” - Aristotle

06-09-2011, 01:01 PM	#5
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,226 Likes: 133 Liked 529 Times in 107 Posts	Re: Stock class transmission case breakage I've broken just one case in 30 years of racing and that was related to a U-joint failure....knock on wood! __________________ Jim Kaekel 3836 STK

06-09-2011, 01:01 PM	#6
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	Re: Stock class transmission case breakage I agree. I think using the wrong type of mount would cause our cars the most trouble. On a related note, do the JW bellhousings with the 30.1 flex plate sheild rating require indexing? __________________ Chris Bowman The Mountain State Mustang 1984 Mustang GT350

06-09-2011, 01:33 PM	#9
Chris1529 VIP Member Join Date: Dec 2006 Location: West Virginia Posts: 1,366 Likes: 6 Liked 70 Times in 29 Posts	Re: Stock class transmission case breakage Tracy- PM Sent