700R4 and TH400 Torque Converter? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JRBECK64 · 10-03-2011, 11:11 PM

Does anyone know if the Torque Converters from the TH400 and the 700R4 are the same? I bought a new one for a TH400 I have and I would like to use it on the 700R4 if it will work.

Thanks for any help.

JRBECK64

rcbildr · 10-04-2011, 01:13 AM

No it will not. The 700R4 has a lock up torque converter and the TH-400 does not. You will need to buy one based on the year of your trans too. I found out the hard way that different years of 700R4's have different spline counts on the trans input shaft.

406 Q-ship · 10-04-2011, 10:27 AM

No

JRBECK64 · 10-04-2011, 11:39 AM

Quote:

Originally Posted by rcbildr

No it will not. The 700R4 has a lock up torque converter and the TH-400 does not. You will need to buy one based on the year of your trans too. I found out the hard way that different years of 700R4's have different spline counts on the trans input shaft.

It was kind of late when I wrote this question and as soon as I posted it I knew it was a stupid question. I have installed 700r4's before so I should have known that!!LOL Anyway Im thinking about putting in a new one just for safe measures. This Engine is going to be putting out about 350HP Which to most probably isnt a lot but it is for me. Anyhow thanks for answering the question. I will count the splines before I go get the Torque Converter.

JRBECK64

CampaS75 · 09-28-2017, 03:05 PM

I have a '75 GMC motorhome that the transmission went.
It's a TH400 and there is a good deal on a 700R4.
Should I convert to the 700 and would it be costly ?
Anyone ?

Bigdav160 · 09-28-2017, 03:10 PM

Quote:

Originally Posted by CampaS75

I have a '75 GMC motorhome that the transmission went.
It's a TH400 and there is a good deal on a 700R4.
Should I convert to the 700 and would it be costly ?
Anyone ?

There's a reason 700R4/4L60 was a transmission for 1/2 ton pickups and cars. It was not used in 3/4 ton and higher.

edit, I would say no way

CampaS75 · 09-28-2017, 03:13 PM

Ok. Thanks !
I will look for another 400.

10-03-2011, 11:11 PM	#1
JRBECK64 Registered User Join Date: Sep 2008 Location: Cornelius Oregon Posts: 1,073	700R4 and TH400 Torque Converter? Does anyone know if the Torque Converters from the TH400 and the 700R4 are the same? I bought a new one for a TH400 I have and I would like to use it on the 700R4 if it will work. Thanks for any help. JRBECK64

10-04-2011, 01:13 AM	#2
rcbildr Registered User Join Date: Sep 2000 Location: Gold Bar, WA Posts: 1,216	Re: 700R4 and TH400 Torque Converter? No it will not. The 700R4 has a lock up torque converter and the TH-400 does not. You will need to buy one based on the year of your trans too. I found out the hard way that different years of 700R4's have different spline counts on the trans input shaft. __________________ My Projects: 1960 GMC 1/2ton with 305 V6 (daily driver) 1963 Chevy 1/2ton 2wd...converting to 4x4 1967 Suburban 1/2ton 2wd My Girlfriends Projects 1985 Chevy Suburban 3/4ton 4x4 with 6.2L diesel, 4" lift, converted to TH-400, Warn Premium manual hubs, & Wildcat 315/75/R16 tires. (daily driver) 1978 Camaro Type LT with a Marine 350 & vortec heads, Rochester Carb, & roller cam 1978 Camaro Z28

10-04-2011, 10:27 AM	#3
406 Q-ship Registered User Join Date: Oct 2010 Location: Largo Florida Posts: 632	Re: 700R4 and TH400 Torque Converter? No __________________ Lifes journey is not to arrive at the gate well preserved, it is to slide in sideways all used up and wore out yelling.....God what'a ride! Where patience fails, force prevails Stapp's Ironical Paradox "The universal aptitude for ineptitude makes any human accomplishment an incredible miracle."

09-28-2017, 03:05 PM	#5
CampaS75 Registered User Join Date: Sep 2017 Location: Calgary, Alberta Posts: 11	Re: 700R4 and TH400 Torque Converter? I have a '75 GMC motorhome that the transmission went. It's a TH400 and there is a good deal on a 700R4. Should I convert to the 700 and would it be costly ? Anyone ?

09-28-2017, 03:13 PM	#7
CampaS75 Registered User Join Date: Sep 2017 Location: Calgary, Alberta Posts: 11	Re: 700R4 and TH400 Torque Converter? Ok. Thanks ! I will look for another 400.



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