1966 C20 with 400 auto floor question??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**HOTFUN** · 09-10-2012, 09:38 PM

Help from the experts with experience or owners of a factory installed 3 speed automatic in 65/66 C20 trucks????

Ok so on an original factory installed turbo 400 automatic in the 65/66 C20 pickups did they just use the regular low hump one piece floor pan as installed with the powerglide and 3 speeds? My factory 327 with turbo 400 in my 67 C10 did not use the bolt in high hump and I believe they didn't go to that bolt in high hump pan until the big block turbo 400 install in 68.

Main question to ask now will the turbo 400 fit in place of the powerglide in a 66 C10 behind a factory 327 with the original low floor hump? Thanks.

**yelmer** · 09-11-2012, 12:30 AM

i have 2 factory 66 327 with turbo 400 both have small hump floors

LT1 Burb · 09-11-2012, 01:03 AM

The 66 turbo 400 I have in my garage is the same size as the powerglide and was a low hump.

**HOTFUN** · 09-11-2012, 09:37 AM

Great info guys. I'm leaning closer to restoring mine with a turbo 400 since I have found an original 66 327 4 barrel carb with the 400 kickdown paddle, the carb kickdown switch and correct bracket. Then finally I found a correct looking 3 speed dial for the column. I just wanted to make sure the low hump floor would be correct looking and also be able to use the nos low hump floor mat.
Thanks! Mark

09-10-2012, 09:38 PM	#1
HOTFUN Senior Member Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,144	1966 C20 with 400 auto floor question??? Help from the experts with experience or owners of a factory installed 3 speed automatic in 65/66 C20 trucks???? Ok so on an original factory installed turbo 400 automatic in the 65/66 C20 pickups did they just use the regular low hump one piece floor pan as installed with the powerglide and 3 speeds? My factory 327 with turbo 400 in my 67 C10 did not use the bolt in high hump and I believe they didn't go to that bolt in high hump pan until the big block turbo 400 install in 68. Main question to ask now will the turbo 400 fit in place of the powerglide in a 66 C10 behind a factory 327 with the original low floor hump? Thanks. __________________ '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"

09-11-2012, 12:30 AM	#2
yelmer Registered User Join Date: Aug 2008 Location: greeley colorado Posts: 1,360	Re: 1966 C20 with 400 auto floor question??? i have 2 factory 66 327 with turbo 400 both have small hump floors

09-11-2012, 01:03 AM	#3
LT1 Burb Registered User Join Date: Sep 2010 Location: Winchester Oregon, formerly Vancouver BC Posts: 2,949	Re: 1966 C20 with 400 auto floor question??? The 66 turbo 400 I have in my garage is the same size as the powerglide and was a low hump.

09-11-2012, 09:37 AM	#4
HOTFUN Senior Member Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,144	Re: 1966 C20 with 400 auto floor question??? Great info guys. I'm leaning closer to restoring mine with a turbo 400 since I have found an original 66 327 4 barrel carb with the 400 kickdown paddle, the carb kickdown switch and correct bracket. Then finally I found a correct looking 3 speed dial for the column. I just wanted to make sure the low hump floor would be correct looking and also be able to use the nos low hump floor mat. Thanks! Mark __________________ '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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