TH 350 case

Rob Petrie E395 · 06-27-2023, 10:46 AM

Driveshaft broke and took case with it. I’m told the 4WD cases are stronger. Are 2WD and 4WD cases interchangeable? How can you tell the difference? Basically I’m wanting to find a case and hopefully it didn’t damage too much inside. So internals can just be swapped. And I can keep it as a spare

Duane Eiskant II · 06-27-2023, 11:29 AM

I figured it took the case out also. YEARS ago at the IHRA points race in Norwalk my C4 bound up and took the top of the case off.. Good times

Jim Kaekel · 06-27-2023, 11:35 AM

The 4WD case accepts a cast aluminum dust cover and is a bit stronger in that area but the bellhousing area isn't much stronger. Any time you lose a driveshaft, you can almost guarantee the case is going to be cracked. Stronger alternative is a JW or ATI bellhousing, or ATI case with bellhousing. Internally as long as it's an early, non lock-up TH-350 and not a TH-250, which includes an external adjuster for an intermediate band, cases and internal parts are fully interchangeable. Also 6", 9", or 12" tailhousings with the appropriate output shaft.

06-27-2023, 10:46 AM	#1
Rob Petrie E395 VIP Member Join Date: Dec 2007 Location: Woodlawn IL Posts: 1,092 Likes: 162 Liked 216 Times in 77 Posts	TH 350 case Driveshaft broke and took case with it. I’m told the 4WD cases are stronger. Are 2WD and 4WD cases interchangeable? How can you tell the difference? Basically I’m wanting to find a case and hopefully it didn’t damage too much inside. So internals can just be swapped. And I can keep it as a spare

06-27-2023, 11:29 AM	#2
Duane Eiskant II Senior Member Join Date: Dec 2001 Location: Alexandria, Va Posts: 501 Likes: 261 Liked 57 Times in 33 Posts	Re: TH 350 case I figured it took the case out also. YEARS ago at the IHRA points race in Norwalk my C4 bound up and took the top of the case off.. Good times __________________ Duane Eiskant 1354 Stock/Super Stock

06-27-2023, 11:35 AM	#3
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,226 Likes: 133 Liked 529 Times in 107 Posts	Re: TH 350 case The 4WD case accepts a cast aluminum dust cover and is a bit stronger in that area but the bellhousing area isn't much stronger. Any time you lose a driveshaft, you can almost guarantee the case is going to be cracked. Stronger alternative is a JW or ATI bellhousing, or ATI case with bellhousing. Internally as long as it's an early, non lock-up TH-350 and not a TH-250, which includes an external adjuster for an intermediate band, cases and internal parts are fully interchangeable. Also 6", 9", or 12" tailhousings with the appropriate output shaft. __________________ Jim Kaekel 3836 STK