Turbo 350 or Turbo 400 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Ackattack · 09-30-2007, 01:05 AM

I pulled the engine and tranny from my C-20 parts truck today. Sold the 350. It has a 3 speed auto, but I really don't know how to tell a TH-350 apart from a TH-400.

I was thinking that the TH-400 has some type of electronic kickdown switch or something....this one didn't have any wires hooked up to it.

But then again, being a 3/4 ton, I'd expect a TH-400.

skokie · 09-30-2007, 01:09 AM

The turbo 400 has a electronic kick down switch on the drivers side of the tranny. If you go to the bottom of this page http://www.classicheartbeat.com/Tips.htm
you should be able to ID your tranny by looking at the pan.

**FRENCHBLUE72** · 09-30-2007, 01:13 AM

th350 pan is a square with a corner cut off and the th400 has kinda of a kidney bean shape to it..

corn · 09-30-2007, 01:13 AM

The 350 looks square with a corner gone & the 400 has an irregular shape...

Ackattack · 09-30-2007, 01:22 AM

Hey thanks guys....looks like its a TH350

**70cst** · 09-30-2007, 08:03 AM

Gee...Is it me but does the 400 sort of look like the State of OHIO?
But then again I may be in the state of confusion?

09-30-2007, 01:05 AM	#1
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Turbo 350 or Turbo 400 I pulled the engine and tranny from my C-20 parts truck today. Sold the 350. It has a 3 speed auto, but I really don't know how to tell a TH-350 apart from a TH-400. I was thinking that the TH-400 has some type of electronic kickdown switch or something....this one didn't have any wires hooked up to it. But then again, being a 3/4 ton, I'd expect a TH-400. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

09-30-2007, 01:09 AM	#2
skokie Registered User Join Date: Oct 2003 Location: San Jose Ca. Posts: 3,334	Re: Turbo 350 or Turbo 400 The turbo 400 has a electronic kick down switch on the drivers side of the tranny. If you go to the bottom of this page http://www.classicheartbeat.com/Tips.htm you should be able to ID your tranny by looking at the pan. __________________ RIP to my son Dylan. 5/17/2002 - 8/18/2018 If you want to know more about rare forms of pediatric cancer or if you want to help fund pediatric cancer research, please check out the website for the non-profit I started. https://slothforpedcancer.org 68 build thread http://67-72chevytrucks.com/vboard/s...d.php?t=223234

09-30-2007, 01:13 AM	#3
FRENCHBLUE72 PROJECT 7DEUCE Join Date: Dec 2002 Location: GRANTS PASS OR Posts: 21,604	Re: Turbo 350 or Turbo 400 th350 pan is a square with a corner cut off and the th400 has kinda of a kidney bean shape to it.. __________________ GO BIG GREEN GO DUCKS MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P..

09-30-2007, 01:13 AM	#4
corn Registered User Join Date: Dec 2003 Location: here Posts: 5,789	Re: Turbo 350 or Turbo 400 The 350 looks square with a corner gone & the 400 has an irregular shape... Last edited by corn; 10-10-2009 at 12:17 PM.

09-30-2007, 01:22 AM	#5
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: Turbo 350 or Turbo 400 Hey thanks guys....looks like its a TH350 __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

09-30-2007, 08:03 AM	#6
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,365	Re: Turbo 350 or Turbo 400 Gee...Is it me but does the 400 sort of look like the State of OHIO? But then again I may be in the state of confusion? __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! Last edited by 70cst; 09-30-2007 at 08:03 AM.



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