Question converting from manual to TH400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**ScottH** · 03-09-2004, 11:32 PM

I have a 68 C10 that had a sbc with a four speed before I got it. Not sure what the truck was originally. I plan on installing a 402 with a TH400. My question is will I need to install a high hump center section in the floor?

Any info or suggestions are appreciated.

Thanks.

Scott

Vince M · 03-09-2004, 11:39 PM

Can't help with the big block but my TH400 behind a small block fits in with a small hump.

67_SS396 · 03-10-2004, 01:09 AM

I have a 408 BB in my '67 and am in the middle of installing a TH400. It clears just fine and I have the small hump cab. I even used later model engine mounts that sit the engine slightly higher than the period correct mounts. All I'm waiting on now is my converter from Torco and shortening the driveshaft, then she'll be back on the road.

Tx Firefighter · 03-10-2004, 01:54 AM

My truck is also a low hump conversion to big block and TH400. It's close, but it clears. If your cab mounts are saggy though, the cab will rub the transmission. New mounts will raise the cab up enough to relieve the problem.

03-09-2004, 11:32 PM	#1
ScottH Senior Member Join Date: Sep 2002 Location: Hampstead, NC Posts: 8,193	Question converting from manual to TH400 I have a 68 C10 that had a sbc with a four speed before I got it. Not sure what the truck was originally. I plan on installing a 402 with a TH400. My question is will I need to install a high hump center section in the floor? Any info or suggestions are appreciated. Thanks. Scott

03-09-2004, 11:39 PM	#2
Vince M Senior Member Join Date: Apr 2000 Location: Orlando, FL Posts: 1,076	Can't help with the big block but my TH400 behind a small block fits in with a small hump. __________________ ............................................................ 68 Chevy CST SWB w/LS1, carb & 700r4. Golden Anniversary clone with a few improvements.

03-10-2004, 01:09 AM	#3
67_SS396 Registered User Join Date: Mar 2000 Location: Blue Ridge, Tx Posts: 1,172	I have a 408 BB in my '67 and am in the middle of installing a TH400. It clears just fine and I have the small hump cab. I even used later model engine mounts that sit the engine slightly higher than the period correct mounts. All I'm waiting on now is my converter from Torco and shortening the driveshaft, then she'll be back on the road. __________________ Fawker Fab three seater rock crawler buggy 498 BBC/SM465/203/205 doubler, propane, 5.13's, 42" PB Rockers '66 C10 - The new hot rod '77 3+3 Dually - 12 valve 4wd conversion tow rig project '28 Ford 2 door sedan street rod RevLimit Offroad "Hang on beer, we can do this."

03-10-2004, 01:54 AM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	My truck is also a low hump conversion to big block and TH400. It's close, but it clears. If your cab mounts are saggy though, the cab will rub the transmission. New mounts will raise the cab up enough to relieve the problem. __________________ I'm on the Instagram- @Gearhead_Kevin



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