1971 Chevy truck Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Big bad Green · 04-23-2013, 08:51 PM

Hey guys I have a 1971 Chevy K20 4wd And I bought It all apart It has no engine in it. It has a TH400 sitting in the frame rails my question is is there a way to tell on the cab if it was an auto or standerd truck.

thanks jace

**jocko** · 04-23-2013, 08:54 PM

no hole in floor for shifter (not 205 shifter) indicates not a 4-spd. Unless you have the column (?) I'm not sure of another give-away that it was or wasn't a 3OTT.

Btw, I do not believe TH400 was available from the factory in K's. I'm not 100% positive on that - perhaps just a K10 thing, but I thought it was the case for K20s also.

Still have the glovebox door/SPID that came with your cab? It will list the auto trans - lack of M49 on the SPID usually means manual trans. I'm assuming you don't have that info though.

Not a definitive answer for you, but maybe will help.

**Ol Blue K20** · 04-23-2013, 09:11 PM

I agree with Jocko, K20 had th350 if auto
Posted via Mobile Device

Big bad Green · 04-23-2013, 10:01 PM

well the hump in the floor is missing

**nbrfd007** · 04-23-2013, 10:41 PM

There would be a flang on the divers side of the frame for the clutch bell crank linkage attaches to, if it was a standard.

**nbrfd007** · 04-23-2013, 10:51 PM

Here a picture of the bracket.

**special-K** · 04-24-2013, 07:20 AM

If the truck was an automatic from factory there will be a clutch linkage block-off plate on the firewall. There will be a boot there for the linkage if it was a manual.

04-23-2013, 08:51 PM	#1
Big bad Green Registered User Join Date: Dec 2010 Location: Eliot Maine Posts: 231	1971 Chevy truck Question Hey guys I have a 1971 Chevy K20 4wd And I bought It all apart It has no engine in it. It has a TH400 sitting in the frame rails my question is is there a way to tell on the cab if it was an auto or standerd truck. thanks jace __________________ 1968 Chevy K20 Long bed dump truck 1978 Chevy Custom deluxe long bed 1986 Chevy Custom deluxe short bed 1987 Chevy Custom deluxe short bed 1987 Chevy Silverado short bed 1990 Chevy Silverado K5 Blazer All four wheel drive! All non mutt trucks!

04-23-2013, 08:54 PM	#2
jocko Senior Member Join Date: Oct 2009 Location: Godley, TX Posts: 17,995	Re: 1971 Chevy truck Question no hole in floor for shifter (not 205 shifter) indicates not a 4-spd. Unless you have the column (?) I'm not sure of another give-away that it was or wasn't a 3OTT. Btw, I do not believe TH400 was available from the factory in K's. I'm not 100% positive on that - perhaps just a K10 thing, but I thought it was the case for K20s also. Still have the glovebox door/SPID that came with your cab? It will list the auto trans - lack of M49 on the SPID usually means manual trans. I'm assuming you don't have that info though. Not a definitive answer for you, but maybe will help.

04-23-2013, 09:11 PM	#3
Ol Blue K20 Proprietor of Dale's Corner Join Date: Nov 2012 Location: Vacaville , CA Posts: 16,359	Re: 1971 Chevy truck Question I agree with Jocko, K20 had th350 if auto Posted via Mobile Device __________________ "Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man R.I.P. FleetsidePaul

04-23-2013, 10:01 PM	#4
Big bad Green Registered User Join Date: Dec 2010 Location: Eliot Maine Posts: 231	Re: 1971 Chevy truck Question well the hump in the floor is missing __________________ 1968 Chevy K20 Long bed dump truck 1978 Chevy Custom deluxe long bed 1986 Chevy Custom deluxe short bed 1987 Chevy Custom deluxe short bed 1987 Chevy Silverado short bed 1990 Chevy Silverado K5 Blazer All four wheel drive! All non mutt trucks!

04-23-2013, 10:41 PM	#5
nbrfd007 Senior Member Join Date: Nov 2007 Location: New Blaine, Arkansas Posts: 751	Re: 1971 Chevy truck Question There would be a flang on the divers side of the frame for the clutch bell crank linkage attaches to, if it was a standard.

04-23-2013, 10:51 PM	#6
nbrfd007 Senior Member Join Date: Nov 2007 Location: New Blaine, Arkansas Posts: 751	Re: 1971 Chevy truck Question Here a picture of the bracket. Attached Images

04-24-2013, 07:20 AM	#7
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1971 Chevy truck Question If the truck was an automatic from factory there will be a clutch linkage block-off plate on the firewall. There will be a boot there for the linkage if it was a manual. __________________ "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 ~



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