1966 GMC with TH400 auto - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sodly · 03-30-2015, 10:40 PM

I believe you could order the TH400 auto transmission behind a big GMC v6 in 1966 only. I don't think I've ever seen this combo in a real truck. Does anyone have one? Or photos? Just curious about its popularity. Wonder how well suited the two were to one another. Anyone have experience with it?

1963c-10 · 03-31-2015, 08:50 AM

Was one that popped up on her last year. I believe it was up in Nebraska....had the TH400 and it was a 66. What brought all the attention was the factory 3 speed auto column.

Found the link: http://67-72chevytrucks.com/vboard/s...d.php?t=577214

Figuarus · 03-31-2015, 02:07 PM

Ive got a 283 with a TH400 out of a 71 Monte Carlo. It's a custom job, but it's possible.

sodly · 03-31-2015, 09:19 PM

Quote:

Originally Posted by Figuarus

Ive got a 283 with a TH400 out of a 71 Monte Carlo. It's a custom job, but it's possible.

No, I'm looking for a V6 GMC backed with a TH400 from the GMC factory.

**Classic v6 GMC's** · 04-01-2015, 06:19 PM

This one on ebay has a 305 v6 and th400. Not mine
http://www.ebay.com/itm/GMC-Other-fl...m=301577495632

sodly · 04-01-2015, 10:52 PM

Quote:

Originally Posted by Classic v6 GMC's

This one on ebay has a 305 v6 and th400. Not mine
http://www.ebay.com/itm/GMC-Other-fl...m=301577495632

From what I can see of the column it looks like it might be a 3 speed auto. Description doesn't specify.

**Classic v6 GMC's** · 04-02-2015, 09:31 AM

It does not specify but under the hood if you look real close you can see a kickdown switch.

factorystock · 04-03-2015, 08:01 PM

Quote:

Originally Posted by sodly

I believe you could order the TH400 auto transmission behind a big GMC v6 in 1966 only.

It appears the TH 400 was a 3/4 ton only thing ( GMC 1500=Chevy 20) in 1966, and it was available with all engines. A $242 option back in '66, wow, what is that in today's dollars?

jdl71 · 04-03-2015, 08:31 PM

$1753.71

http://data.bls.gov/cgi-bin/cpicalc....966&year2=2015

sodly · 04-04-2015, 10:04 PM

Anybody own one? Seen one?

factorystock · 11-07-2015, 12:17 PM

This one still makes me cry. A truck you don't find everyday. Highly optioned low mileage original paint 3/4 ton survivor truck gets the knife and repaint. Here's the write up towards bottom of page. http://www.oldchevytrucks.com/blog/i...eaturedtrucks/

**60-66** · 11-07-2015, 02:53 PM

Wow ! What a shame. Sure would've liked to see that build sheet.

sodly · 11-07-2015, 11:57 PM

Quote:

Originally Posted by 60-66

Wow ! What a shame. Sure would've liked to see that build sheet.

Back when most folks didn't know any better. Another one bites the dust.

**Captainfab** · 11-08-2015, 01:43 AM

This past summer I had the opportunity to buy a '66 GMC 3/4 ton that was equipped with the original TH400, Dana 60 differential. The V6 had been replaced with a 305 SBC. This truck also did not have the vulcanized rubber rear cab mounts. It had what you would typically find on a 1/2 ton. I had to pass on the truck and it was sold to a guy from Colville Washington.

TJ's Chevy · 11-08-2015, 12:13 PM

Quote:

Originally Posted by factorystock

This one still makes me cry. A truck you don't find everyday. Highly optioned low mileage original paint 3/4 ton survivor truck gets the knife and repaint. Here's the write up towards bottom of page. http://www.oldchevytrucks.com/blog/i...eaturedtrucks/

I know Ed though, and he is one of the nicest and most knowledgeable guys you'll meet. At the time he probably just didn't know what he had. But in my opinion...he did a nice restoration. He coulda done worse and thrown a 350 in there and slammed the thing. I like that link though....I got stuck on a couple Chevys posted there! lol

jdl71 · 11-08-2015, 03:59 PM

Quote:

Originally Posted by TJ's Chevy

I know Ed though, and he is one of the nicest and most knowledgeable guys you'll meet. At the time he probably just didn't know what he had. But in my opinion...he did a nice restoration. He coulda done worse and thrown a 350 in there and slammed the thing. I like that link though....I got stuck on a couple Chevys posted there! lol

That '62 4x4 (the first one on the list) is just pure awesomeness.

TJ's Chevy · 11-08-2015, 11:23 PM

Quote:

Originally Posted by jdl71

That '62 4x4 (the first one on the list) is just pure awesomeness.

I sat and looked at that one for some time. lol

**1971 GMC SHORTY** · 11-13-2022, 11:58 PM

Wondering What Bell Housing Looks like

**Bob B.** · 11-15-2022, 02:07 AM

Quote:

Originally Posted by 1971 GMC SHORTY

Wondering What Bell Housing Looks like

For an automatic behind a GMC V-6? Actually they used a Chevy pattern Powerglide or Turbo 400, there was a 2 peice adapter that mated to the V-6 block and had the Chevy bellhousing bolt pattern on the back side. It was used with an iron flywheel and a separate flexplate. The flywheel had an extended hub that brought the flexplate back to meet the torque converter. Good thing about those adapters is that they allow you to use a 700R4/4L60 or 4L80 behind a V-6 if you want to.

**MusicMan70** · 11-15-2022, 02:59 PM

Here's a photo and the support rods for the Turbo 400

**Bob B.** · 11-15-2022, 07:57 PM

Were the support rods used on the '67 and '68 trucks? I don't remember seeing them.

**MusicMan70** · 11-16-2022, 11:24 AM

This thread from the 6066 site seems to imply that they did, but were recalled{?}

https://6066gmcclub.com/showthread.p...t=support+rods

**Bob B.** · 11-18-2022, 02:05 AM

Interesting, sounds like the rods were a 'fix'. Possible there was a bulletin instructing dealers to install the rods if customers complained. That could explain why they are not on every truck.

72highlander · 11-19-2022, 10:02 PM

I have this 66 3/4 ton. 351, auto, custom cab, big glass, power steering and power brakes. It’s not a runner. I was going to steal the auto out of it for another truck but can’t make myself take it apart. Rare bird.

**1971 GMC SHORTY** · 11-20-2022, 02:34 AM

Quote:

Originally Posted by MusicMan70

Here's a photo and the support rods for the Turbo 400

Anyone Have These Laying Around Collecting dust they’d like to part with the

03-30-2015, 10:40 PM	#1
sodly Registered User Join Date: Nov 2009 Location: Nebraska Posts: 1,034	1966 GMC with TH400 auto I believe you could order the TH400 auto transmission behind a big GMC v6 in 1966 only. I don't think I've ever seen this combo in a real truck. Does anyone have one? Or photos? Just curious about its popularity. Wonder how well suited the two were to one another. Anyone have experience with it? __________________ WANTED: * 60-66 Chevy and GMC FACTORY PHOTOGRAPHY (scans) of pickups and carryalls. *Custom Camper Club*-- Own a 65-66 Custom Camper? Join us at: http://67-72chevytrucks.com/vboard/g...hp?groupid=117

03-31-2015, 08:50 AM	#2
1963c-10 Registered User Join Date: Nov 2011 Location: fayetteville nc Posts: 10,338	Re: 1966 GMC with TH400 auto Was one that popped up on her last year. I believe it was up in Nebraska....had the TH400 and it was a 66. What brought all the attention was the factory 3 speed auto column. Found the link: http://67-72chevytrucks.com/vboard/s...d.php?t=577214 __________________ 1963 Short bed step side SBW 427 big block and borg warner T-16 HD 3 speed manual http://67-72chevytrucks.com/vboard/s...d.php?t=519869 1963 Short bed fleetside BBW 348 1st gen big block w/Powerglide http://67-72chevytrucks.com/vboard/s...d.php?t=619024 1964 Short bed trailer

03-31-2015, 02:07 PM	#3
Figuarus Registered User Join Date: Sep 2014 Location: Salt Lake City, UT Posts: 346	Re: 1966 GMC with TH400 auto Ive got a 283 with a TH400 out of a 71 Monte Carlo. It's a custom job, but it's possible. __________________ 2013 Malibu LTZ 1996 C1500 4.3/5spd 2wd

04-01-2015, 06:19 PM	#5
Classic v6 GMC's Senior Member Join Date: Mar 2015 Location: Arizona from Overland Park Kansas Posts: 3,968	Re: 1966 GMC with TH400 auto This one on ebay has a 305 v6 and th400. Not mine http://www.ebay.com/itm/GMC-Other-fl...m=301577495632

04-02-2015, 09:31 AM	#7
Classic v6 GMC's Senior Member Join Date: Mar 2015 Location: Arizona from Overland Park Kansas Posts: 3,968	Re: 1966 GMC with TH400 auto It does not specify but under the hood if you look real close you can see a kickdown switch.

04-03-2015, 08:31 PM	#9
jdl71 Registered User Join Date: Oct 2012 Location: Eldon, MO Posts: 1,753	Re: 1966 GMC with TH400 auto $1753.71 http://data.bls.gov/cgi-bin/cpicalc....966&year2=2015 __________________ Psalm 23 64 C10 66 K20

04-04-2015, 10:04 PM	#10
sodly Registered User Join Date: Nov 2009 Location: Nebraska Posts: 1,034	Re: 1966 GMC with TH400 auto Anybody own one? Seen one? __________________ WANTED: * 60-66 Chevy and GMC FACTORY PHOTOGRAPHY (scans) of pickups and carryalls. *Custom Camper Club*-- Own a 65-66 Custom Camper? Join us at: http://67-72chevytrucks.com/vboard/g...hp?groupid=117

11-07-2015, 12:17 PM	#11
factorystock Registered User Join Date: Feb 2007 Location: west coast Posts: 3,396	Re: 1966 GMC with TH400 auto This one still makes me cry. A truck you don't find everyday. Highly optioned low mileage original paint 3/4 ton survivor truck gets the knife and repaint. Here's the write up towards bottom of page. http://www.oldchevytrucks.com/blog/i...eaturedtrucks/ Attached Images

11-07-2015, 02:53 PM	#12
60-66 Registered User Join Date: Apr 2012 Location: Wisconsin Posts: 3,329	Re: 1966 GMC with TH400 auto Wow ! What a shame. Sure would've liked to see that build sheet. __________________ IS IT an EATON or Chevrolet rear axle https://67-72chevytrucks.com/vboard/...d.php?t=843778 The hubcap thread http://67-72chevytrucks.com/vboard/s...d.php?t=702839 WANTED : 1963-1966 6 Cylinder Fan Shroud WANTED :1964-1966 PANEL TRUCK

11-08-2015, 01:43 AM	#14
Captainfab 60-66 Nut Join Date: Mar 2007 Location: Coeur d'Alene, Idaho Posts: 23,252	Re: 1966 GMC with TH400 auto This past summer I had the opportunity to buy a '66 GMC 3/4 ton that was equipped with the original TH400, Dana 60 differential. The V6 had been replaced with a 305 SBC. This truck also did not have the vulcanized rubber rear cab mounts. It had what you would typically find on a 1/2 ton. I had to pass on the truck and it was sold to a guy from Colville Washington. __________________ Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE

11-13-2022, 11:58 PM	#18
1971 GMC SHORTY Senior Member Join Date: Apr 2009 Location: SAN FERNANDO VALLE SOL CAL Posts: 1,064	Re: 1966 GMC with TH400 auto Wondering What Bell Housing Looks like __________________ 1966 GMC K25 V6 351E Original Utility Truck 2000 C3500 Hot Rod Utility Truck 2003 ROAD KING 100th 124ci 6 Speed 145CI M/P Pro Street FXR 2002 FXDP 2007 2500HD DURAMAX. DD Studio Teamsters / Mechanic Retired GM Master Tech 20 Years Retired Ford Tech 15 Years

11-15-2022, 02:59 PM	#20
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: 1966 GMC with TH400 auto Here's a photo and the support rods for the Turbo 400 Attached Images __________________ MusicMan70 1961 GMC Suburban

11-15-2022, 07:57 PM	#21
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,363	Re: 1966 GMC with TH400 auto Were the support rods used on the '67 and '68 trucks? I don't remember seeing them. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.

11-16-2022, 11:24 AM	#22
MusicMan70 Senior Member Join Date: Feb 2011 Location: Corona, CA Posts: 1,842	Re: 1966 GMC with TH400 auto This thread from the 6066 site seems to imply that they did, but were recalled{?} https://6066gmcclub.com/showthread.p...t=support+rods __________________ MusicMan70 1961 GMC Suburban

11-18-2022, 02:05 AM	#23
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,363	Re: 1966 GMC with TH400 auto Interesting, sounds like the rods were a 'fix'. Possible there was a bulletin instructing dealers to install the rods if customers complained. That could explain why they are not on every truck. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.



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11-19-2022, 10:02 PM	#24
72highlander Sophomore Member Join Date: Jul 2006 Location: brownwood, tx Posts: 927	Re: 1966 GMC with TH400 auto I have this 66 3/4 ton. 351, auto, custom cab, big glass, power steering and power brakes. It’s not a runner. I was going to steal the auto out of it for another truck but can’t make myself take it apart. Rare bird. Attached Images __________________ 1972 Chevrolet Highlander SWB 1972 Custom Deluxe 3/4 2WD 60k miles these trucks don't need vacuum gauges cause they don't suck! two wrongs don't make a right, but three rights do make a left all i want is a little more than i'll ever get it's better to be judged by 12 than to be carried by 6

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