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#1 |
Registered User
Join Date: Jan 2001
Location: Lincoln, Nebraska
Posts: 2,145
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Actual 1966 TH400 vs PG column differences?
Well luckily during the winter, I was rewarded after I traveled 400 miles to capture my 66 C20 Custom Camper with factory air but more rare with the factory original turbo 400 complete from column to the linkages to the brake cables. I have been taking this apart carefully as a rare piece of history, piece by piece, and comparing it to my original 66 C30 327 PG truck donor. Way more differences than meets the eye. All this will be restored, rebuilt, and installed just as the factory did on the line built C20 into my bare 66 C10 swb frame. I have the T400 crossmember and park brake cables all refit and relocated for the dry run on the swb frame. Fit just like it was factory installed but why wouldn't it since they actually made it on the 67 115" frame using the same brake cables.
Pictured is what blew me away that it wasn't just a shift indicator dial addition for the T400 line installation but the actual column shift tube and detent plate was totally different. Of course they also used a different neutral safety switch with BU too. Check the picture of the detent plate comparisons between the turbohydramatic 400 column on the LH side to the powerglide column on the RH side. The linkage arm on the LH side TH 400 is actually 5/8" longer and a different angle which must work with the swing arm swivel linkage that mounts about straight below in the frame channel on the TH 400 truck. Thought some of you fellow purists my enjoy this information.
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'66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed" |
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#2 |
Senior Member
![]() Join Date: Feb 2011
Location: Corona, CA
Posts: 1,840
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Re: Actual 1966 TH400 vs PG column differences?
HotFun, school me a bit here please.
1966 was the first year for the TURBO 400 in these trucks?
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MusicMan70 1961 GMC Suburban |
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#3 |
Registered User
Join Date: Jan 2001
Location: Lincoln, Nebraska
Posts: 2,145
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Re: Actual 1966 TH400 vs PG column differences?
This was the first year as an option only on C20 models according to the GM dealer data book. Otherwise the only automatic available on the 1966 trucks was the 2 speed powerglide. Wonder if it were possible to have the zone office overide the order for a special to get this into other models?
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'66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed" Last edited by HOTFUN; 04-25-2013 at 01:37 PM. |
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#4 |
1965 Chevy C10, 2005 4.8L/4l60
![]() Join Date: Aug 2004
Location: DFW Texas
Posts: 8,543
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Re: Actual 1966 TH400 vs PG column differences?
I didnt know they were TH400's I thought they were different, they were called Turbo Hydromatic transmissions and were a 3 speed upgrade to the PG. I could be mistaken ( Im used to that actually)
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Clyde65 Rebuild of Clyde http://67-72chevytrucks.com/vboard/s...84#post8338184 69 Aristocrat Lo Liner build http://67-72chevytrucks.com/vboard/s...84#post7561684 ![]() ![]() ![]() support our troops! |
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#5 |
Registered User
Join Date: Nov 2009
Location: Galt, Calif
Posts: 2,437
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Re: Actual 1966 TH400 vs PG column differences?
You might want to document this and to which plant it was built at to see if this was a plant issue, or model change, the TH400 did come out in `65, there was one person that had one, and I`m not sure if it was this site or another claiming to be a `65 Custom Camper, was his actually built that way or a registration issue, I don`t know, I `ll have to search for it, it would be nice to see if they built the Custom campers at one plant only.
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`64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip |
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#6 |
Registered User
Join Date: Nov 2009
Location: Nebraska
Posts: 1,034
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Re: Actual 1966 TH400 vs PG column differences?
My 66 CC was built at the Fremont, CA plant.
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#7 |
But Found Her 25yrs Later!
![]() Join Date: Oct 2010
Location: Oregon City, Oregon
Posts: 10,525
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Re: Actual 1966 TH400 vs PG column differences?
Stumbled across this thread.
I kinda wondered what all the differences were.
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I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035 |
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#8 |
Registered User
Join Date: Dec 2010
Location: Strathmore, Alberta
Posts: 470
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Re: Actual 1966 TH400 vs PG column differences?
Wow, that is a very rare piece there. I knew some of the 3/4 tons had Turbo 400's in them, and I always wondered what the column might look like. Up here there are VERY few automatic trucks C10 or C20. I found one and bought the whole truck to get the column, the powerglide itself, correct driveshaft, crossmember, rad with the cooling lines, and shift and kickdown linkages. Not much left of the truck after, was a basket case pretty much already. There are basically no automatic trucks up here, and that 3 speed column and equipment is super rare. I think the kickdown on the T400s is electric also with the switch at the gas pedal, not a linkage. Some cool stuff you have there, and the differences are interesting, especially when they are side by side like that.
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#9 |
Registered User
![]() Join Date: Feb 2011
Location: Joshua Tree Ca.
Posts: 719
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Re: Actual 1966 TH400 vs PG column differences?
Are you thinking of the Turbo Glide better known as Trouble Glide. They didn't go over very well.
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