67' question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

CrazyJdub · 05-07-2006, 01:09 AM

I guess its actually a 70 question. Ive got a 67 longbed with a 70' 350 in it. It has a four speed with granny gear. Im looking for an automatic and would really like to fit a Th400. Does anyone know if it can be directly bolted? Or any that can? Thnx

kingsolver72 · 05-07-2006, 01:31 AM

Absolutely,a 400 turbo hydromatic will bolt up to your 350 no matter what year it is.A th350 will also do the job.Some say that the th350 shifts harder.

**special-K** · 05-07-2006, 06:27 AM

I think you`ll need an automatic croos-member.The 4wds swap right in,that`s all I`ve done.

**dennislbrooks** · 05-07-2006, 06:41 AM

I would like your sm420 4 speed if it is good condition. Shipping would be high most likely. zip 75022 I can pick it up at a truck terminal including ups or fedex.

70GMCer · 05-07-2006, 07:02 AM

going to a 400 turbo will require the drive shaft to be shortened. A 350 turbo with a short shaft tail, is a direct bolt in.

qksilver · 05-07-2006, 11:53 AM

A chevy 400 will bolt, there are B/O/P patterns also

Green Machine · 05-07-2006, 12:59 PM

I think you will have to remove the front manual crossmember for clearance. The SM420 may have a driveshaft yoke that the driveshaft bolts to similar to the rear end. If that is the case, driveshaft mods will be needed. Your current shaft likely has a slip joint near the hanger bearing, and that wont work with and auto setup. Might be cheaper to find the front half or whole shaft from a truck with whichever trans you use, there should be plenty still around.

Longhorn Man · 05-07-2006, 03:52 PM

this would be an easy swap being that the truck could come with a TH400 or a TH350 in 70 hooked to that engine.
You'll need;
Tranny
probbably drive shaft mods/replacement yoke
tranny cooler lines
tranny cooler (real big one if you don't have one in the rad)
a way to shift it (aftermarket shifter on the floor or a new column, good time to get a van tilt unit)
auto tranny cross member
tranny mount
Shift linkages (n/a if going with an aftermarket shifter)
*MIGHT* need a longer speedo cable

05-07-2006, 01:09 AM	#1
CrazyJdub Registered User Join Date: Mar 2006 Location: Sacramento, CA Posts: 30	67' question I guess its actually a 70 question. Ive got a 67 longbed with a 70' 350 in it. It has a four speed with granny gear. Im looking for an automatic and would really like to fit a Th400. Does anyone know if it can be directly bolted? Or any that can? Thnx

05-07-2006, 01:31 AM	#2
kingsolver72 10/30/19 Join Date: Aug 2004 Location: ottawa kansas Posts: 5,245	Re: 67' question Absolutely,a 400 turbo hydromatic will bolt up to your 350 no matter what year it is.A th350 will also do the job.Some say that the th350 shifts harder. __________________ Fight the good fight, finish the race, keep the faith

05-07-2006, 06:27 AM	#3
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 67' question I think you`ll need an automatic croos-member.The 4wds swap right in,that`s all I`ve done. __________________ "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 ~

05-07-2006, 06:41 AM	#4
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,798	Re: 67' question I would like your sm420 4 speed if it is good condition. Shipping would be high most likely. zip 75022 I can pick it up at a truck terminal including ups or fedex.

05-07-2006, 07:02 AM	#5
70GMCer Senior Member Join Date: Apr 2005 Location: Joppa, Maryland Posts: 4,408	Re: 67' question going to a 400 turbo will require the drive shaft to be shortened. A 350 turbo with a short shaft tail, is a direct bolt in. __________________ 1997 GMC Sierra Ext 1965 Mustang

05-07-2006, 11:53 AM	#6
qksilver Senior Member Join Date: Dec 2004 Location: Southern Pines NC Posts: 3,853	Re: 67' question A chevy 400 will bolt, there are B/O/P patterns also

05-07-2006, 12:59 PM	#7
Green Machine Senior Member Join Date: Jul 2004 Location: Estherville, Iowa Posts: 3,371	Re: 67' question I think you will have to remove the front manual crossmember for clearance. The SM420 may have a driveshaft yoke that the driveshaft bolts to similar to the rear end. If that is the case, driveshaft mods will be needed. Your current shaft likely has a slip joint near the hanger bearing, and that wont work with and auto setup. Might be cheaper to find the front half or whole shaft from a truck with whichever trans you use, there should be plenty still around. __________________ 1968 C10 307 3spd Long Fleet ------ http://67-72chevytrucks.com/vboard/s...d.php?t=201103 1970 C10 305 Super T10 Long Fleet --- http://67-72chevytrucks.com/vboard/s...d.php?t=202285 1971 C20 383 TH350 Dana Posi ----- http://67-72chevytrucks.com/vboard/s...d.php?t=206894 2001 GMC Sierra 1500 C3 6.0

05-07-2006, 03:52 PM	#8
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: 67' question this would be an easy swap being that the truck could come with a TH400 or a TH350 in 70 hooked to that engine. You'll need; Tranny probbably drive shaft mods/replacement yoke tranny cooler lines tranny cooler (real big one if you don't have one in the rad) a way to shift it (aftermarket shifter on the floor or a new column, good time to get a van tilt unit) auto tranny cross member tranny mount Shift linkages (n/a if going with an aftermarket shifter) MIGHT need a longer speedo cable



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