TH400 under small hump floor - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67c-10Texas · 08-20-2006, 10:38 PM

Will a TH400 fit under a "standard" floor (small hump floor? I am using 80's era front suspension with the correct V8 motor mounts.

any help would be great
thanks

Longhorn Man · 08-20-2006, 10:42 PM

small block or inline, yes. That's how it woulda come from the factory.
With a big block, it woulda had a high hump. It'll fit if you have good cab mounts, but IMO, NOT a good idea. GM didn't throw the high hump on there just to do it. They did it for a reason.

**PICKMUP** · 08-21-2006, 02:57 PM

Go ahead and put the th400 under the low floor...it will clear just fine. If it didn't you can just cut the floor and bolt in a high tunnel, but I am sure it will clear with no problem. I run that setup with old cab mounts and no problem.

junkyardjohn · 08-21-2006, 06:12 PM

It'll Fit. I've Done It Without A Problem. Not A Whole Lot Of Clearance But It Never Touched Under Any Circumstances. I Probably Got More Heat From The Tranny Inside The Cab, But I Always Run A Tranny Cooler & A Trans. Temp Gage & It Never Got Hot. J0hn

qksilver · 08-21-2006, 08:35 PM

It will fit but as mentioned above the cab will be hotter because there isn't as much air flow, plus, make sure all your mounts are in good shape.

67Mach1 · 08-21-2006, 09:12 PM

So a 71 long bed with a 402 and th400 has a high hump? Good thing I have not trashed the truck yet. Going to take that sucker out next time I go home. Almost trashed it last weekend. Good think i didnt.

T

69-350 · 08-22-2006, 12:55 AM

going along these lines, I've got a 71 cab that had a 350/automatic stuffed under it, I was wondering if a 4speed on a 350 will work? (obviously cutting for the shifter, and with new body mounts) Or do I have to hack the whole tranny hump out and put a removable one in?

Longhorn Man · 08-22-2006, 05:28 AM

What kind of 4 speed?

**special-K** · 08-22-2006, 08:05 AM

A NewProcess 4spd will require the high-hump,for sure.

69-350 · 08-22-2006, 09:48 AM

just the stock 4 speed that came in a 69 (isn't that a NP21 or something?)

junkyardjohn · 08-22-2006, 09:58 AM

Quote:

Originally Posted by 67Mach1

So a 71 long bed with a 402 and th400 has a high hump? Good thing I have not trashed the truck yet. Going to take that sucker out next time I go home. Almost trashed it last weekend. Good think i didnt.T

NOT ONLY THAT A FACTORY B/B WITH AN AUTO WILL HAVE A TALL HUMP WITHOUT ANY HOLES IN IT. THIS MAKES IT WORTH ABOUT TWICE AS MUCH. I'VE SEEN EM GO FROM $30 TO $50 DEPENDING ON THE CONDITION & HOW BAD SOMEONE WANTS IT.

JOHN

08-20-2006, 10:38 PM	#1
67c-10Texas Registered User Join Date: Apr 2006 Location: Texas Posts: 259	TH400 under small hump floor Will a TH400 fit under a "standard" floor (small hump floor? I am using 80's era front suspension with the correct V8 motor mounts. any help would be great thanks

08-20-2006, 10:42 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH400 under small hump floor small block or inline, yes. That's how it woulda come from the factory. With a big block, it woulda had a high hump. It'll fit if you have good cab mounts, but IMO, NOT a good idea. GM didn't throw the high hump on there just to do it. They did it for a reason.

08-21-2006, 02:57 PM	#3
PICKMUP "Trucks with Class" Join Date: Jul 2000 Location: OLYMPIA, WA, USA Posts: 8,126	Re: TH400 under small hump floor Go ahead and put the th400 under the low floor...it will clear just fine. If it didn't you can just cut the floor and bolt in a high tunnel, but I am sure it will clear with no problem. I run that setup with old cab mounts and no problem.

08-21-2006, 06:12 PM	#4
junkyardjohn Registered User Join Date: Aug 2001 Location: SOMERSET KY. Posts: 6,427	Re: TH400 under small hump floor It'll Fit. I've Done It Without A Problem. Not A Whole Lot Of Clearance But It Never Touched Under Any Circumstances. I Probably Got More Heat From The Tranny Inside The Cab, But I Always Run A Tranny Cooler & A Trans. Temp Gage & It Never Got Hot. J0hn __________________ junkyardjohn 69 1 TON TOW TRUCK // 84 4WD CUCV BLAZER// 85 1 TON 4WD STAKE TRUCK// 86 M1031 5/4 TON 4WD CUCV// ALOT OF OLD TRUCKS FOR ONE OLD MAN TO DRIVE. THERES ROOM FOR ALL OF GODS CREATURES RIGHT NEXT TO MY MASHED POTATOES// LIFE MEMBER OF P.E.T.A (PEOPLE EATING TASTY ANIMALS) DON'T RENT U-HAUL ALWAYS TELL THE TRUTH IT WILL AMAZE PART OF THE PEOPLE & ASTONISH THE REST

08-21-2006, 08:35 PM	#5
qksilver Senior Member Join Date: Dec 2004 Location: Southern Pines NC Posts: 3,853	Re: TH400 under small hump floor It will fit but as mentioned above the cab will be hotter because there isn't as much air flow, plus, make sure all your mounts are in good shape.

08-21-2006, 09:12 PM	#6
67Mach1 Senior Member Join Date: Nov 2005 Location: Round Rock, TX Posts: 1,100	Re: TH400 under small hump floor So a 71 long bed with a 402 and th400 has a high hump? Good thing I have not trashed the truck yet. Going to take that sucker out next time I go home. Almost trashed it last weekend. Good think i didnt. T __________________ Soon to be selling all but one, or two... Depends on what the Boss has to say....... 67 GMC Shortbed 454 Project more junk and most of it is for sale

08-22-2006, 12:55 AM	#7
69-350 Oil trash and damn proud of it Join Date: Aug 2005 Location: Williston, ND Posts: 1,993	Re: TH400 under small hump floor going along these lines, I've got a 71 cab that had a 350/automatic stuffed under it, I was wondering if a 4speed on a 350 will work? (obviously cutting for the shifter, and with new body mounts) Or do I have to hack the whole tranny hump out and put a removable one in? __________________ Mark 1997 K1500 Z71, 14 bolt SF 3.73 posi, Bright Blue Metallic. 6" Superlift 1972 C-10, toolbox, p/s, 350/TH350/3.73 open, black int., bronze 2008 Dodge MegaCab. H&S tuned 6.7 Cummins. Fast Four Tons Some of my pics http://s107.photobucket.com/albums/m294/69-350/

08-22-2006, 05:28 AM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: TH400 under small hump floor What kind of 4 speed?

08-22-2006, 08:05 AM	#9
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,861	Re: TH400 under small hump floor A NewProcess 4spd will require the high-hump,for sure. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

08-22-2006, 09:48 AM	#10
69-350 Oil trash and damn proud of it Join Date: Aug 2005 Location: Williston, ND Posts: 1,993	Re: TH400 under small hump floor just the stock 4 speed that came in a 69 (isn't that a NP21 or something?) __________________ Mark 1997 K1500 Z71, 14 bolt SF 3.73 posi, Bright Blue Metallic. 6" Superlift 1972 C-10, toolbox, p/s, 350/TH350/3.73 open, black int., bronze 2008 Dodge MegaCab. H&S tuned 6.7 Cummins. Fast Four Tons Some of my pics http://s107.photobucket.com/albums/m294/69-350/



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