Muncie Autogear case?
Thread Starter
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
Muncie Autogear case?
I had to take my Muncie apart after a front bearing retainer bolt stripped. Found another which looks it was damaged during a previous repair. While removing the parts in preparation to install some helicoils I noted the counter gear shaft can be pushed out by hand, no real resistance. From what I've read this is a common source of oil leaks and may cause the counter gear to not deeply engage with the gear set. Any opinions on this? It seems I have two options. Look for someone to fix the current case or buy a replacement. I've heard of some having an 'O' ring installed to take care of the leak. This may work but doesn't address the alignment issues I hear about if the hole is egg shaped now. Installing a bushing seems to be a better approach though I don't know of any local shops who could do this. Last option is a new case from Autogear. Has anybody had experience with the Autogear case? Does the added length cause any installation problems in a Corvette? Will the other castings bolt on to this case? Tail housing, center bearing, and side cover? I recall the Autogear case takes a different input bearing.
Posted the same on the NCRS web site, looking for opinions. I need to make a repair ASAP.
Posted the same on the NCRS web site, looking for opinions. I need to make a repair ASAP.
Melting Slicks
Joined: Sep 2004
Posts: 2,655
Likes: 19
I was in the same boat with my Muncie. You can send the case to a couple different places that will install a bushing to true the hole position and size. The only way to fix it IMO. The cost for that was about $70-100 IIRC.
I was going with the Autogear supercase but found a different trans instead. My understanding a couple years ago was the supercase worked with all the Muncie components. They had midplate, tailhousing, side cover upgrades as well as a front sealed bearing, but were not necessary to use them. Call Autogear and check on current design. Given the choice between bushing an old case for $100 with stripped holes, prone to cracked ears, etc. vs. a $225 supercse, my choice would be the case upgrade. But that obviously wouldn't be a numbers matching item.
I was going with the Autogear supercase but found a different trans instead. My understanding a couple years ago was the supercase worked with all the Muncie components. They had midplate, tailhousing, side cover upgrades as well as a front sealed bearing, but were not necessary to use them. Call Autogear and check on current design. Given the choice between bushing an old case for $100 with stripped holes, prone to cracked ears, etc. vs. a $225 supercse, my choice would be the case upgrade. But that obviously wouldn't be a numbers matching item.
Thread Starter
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
I was in the same boat with my Muncie. You can send the case to a couple different places that will install a bushing to true the hole position and size. The only way to fix it IMO. The cost for that was about $70-100 IIRC.
I was going with the Autogear supercase but found a different trans instead. My understanding a couple years ago was the supercase worked with all the Muncie components. They had midplate, tailhousing, side cover upgrades as well as a front sealed bearing, but were not necessary to use them. Call Autogear and check on current design. Given the choice between bushing an old case for $100 with stripped holes, prone to cracked ears, etc. vs. a $225 supercse, my choice would be the case upgrade. But that obviously wouldn't be a numbers matching item.
I was going with the Autogear supercase but found a different trans instead. My understanding a couple years ago was the supercase worked with all the Muncie components. They had midplate, tailhousing, side cover upgrades as well as a front sealed bearing, but were not necessary to use them. Call Autogear and check on current design. Given the choice between bushing an old case for $100 with stripped holes, prone to cracked ears, etc. vs. a $225 supercse, my choice would be the case upgrade. But that obviously wouldn't be a numbers matching item.
The point of the whole exercise is to get the clutch working properly and resolve oil leaks from the transmission. It seems I need to either have a bushing installed in the case or get a new case. Having a bushing installed may take more time than I have unless there's a shop in CT or MA who can handle this. Then there's the matter of installing at least 4 heli-coils for the bearing retainer, maybe more once I inspect all holes.
Racer
Joined: Oct 2014
Posts: 264
Likes: 3
There are 7/8" dia countershaft Supercases and 1" dia countershaft Supercases (same casting). The kit (18-410-001 or -002) includes a SEALED 307 front ball bearing, a gasket set, and "zero-leak" o-ringed fill and drain plugs.
When repairing the case, have your machinist verify that his repair will restore the parallelism between the mainshaft and countershaft centerlines. Good luck!
When repairing the case, have your machinist verify that his repair will restore the parallelism between the mainshaft and countershaft centerlines. Good luck!
