TH400 / TH700R4 conversion question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

the baron · 08-28-2003, 07:20 AM

Hi Guys ,
question :
will the sliding part of the drive shaft coming out of a TH700R4 fit on a TH400 ? .
I began yesterday to pull the engine/tranny combo ( 6.2 Diesel/TH700 ) out of the Burb I bought , to be replaced by a Olds 350/TH400 combo , coming from my truck...
I have a two pieces drive shaft on the truck , with a sliding part between the two pieces , does the first part of that drive shaft also slide in the tranny

Thanks ,
The Baron

79BIG10 · 08-28-2003, 06:09 PM

Afraid not. The TH350 and TH700r4 have the same spline out of the tranny but the TH400 is different. If you can find a TH350 or TH700r4 equipped truck you can use the driveshaft end then. On some models the whole driveshaft will interchange with no shortening of it since the 700r4 is longer.

slvrd1991 · 08-28-2003, 10:08 PM

i just pulled out a 400 and replaced it with a 700r-4 and used the same driveshaft yoke.

slvrd1991 · 08-28-2003, 10:21 PM

i think that 700r-4, th400, and th-350 aree the same

79BIG10 · 08-28-2003, 11:27 PM

The TH400 has a 31 spline output shaft compared to the 27 spline shaft on the TH350.

http://www.geocities.com/MotorCity/5...-newmouse.html

the baron · 08-30-2003, 12:07 PM

Thanks Guys ,
I think the better option right now is to dismantle both pieces and check them...

In the worst case , I will have to use the TH400 yoke and adapt the Burb drive shaft , no big deal.

I'm just worried about the two trannies lengths , I hope I won't have to shorten that drive shaft...

We'll see , I'll take some pic's next week and post them here

have a nice weekend

The Baron

08-28-2003, 07:20 AM	#1
the baron Registered User Join Date: Mar 2003 Location: Liège , Belgium Posts: 263	TH400 / TH700R4 conversion question Hi Guys , question : will the sliding part of the drive shaft coming out of a TH700R4 fit on a TH400 ? . I began yesterday to pull the engine/tranny combo ( 6.2 Diesel/TH700 ) out of the Burb I bought , to be replaced by a Olds 350/TH400 combo , coming from my truck... I have a two pieces drive shaft on the truck , with a sliding part between the two pieces , does the first part of that drive shaft also slide in the tranny Thanks , The Baron

08-28-2003, 06:09 PM	#2
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Afraid not. The TH350 and TH700r4 have the same spline out of the tranny but the TH400 is different. If you can find a TH350 or TH700r4 equipped truck you can use the driveshaft end then. On some models the whole driveshaft will interchange with no shortening of it since the 700r4 is longer. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

08-28-2003, 11:27 PM	#5
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	The TH400 has a 31 spline output shaft compared to the 27 spline shaft on the TH350. http://www.geocities.com/MotorCity/5...-newmouse.html __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

08-28-2003, 10:08 PM	#3
slvrd1991 Registered User Join Date: Dec 2002 Location: Fl Posts: 28	i just pulled out a 400 and replaced it with a 700r-4 and used the same driveshaft yoke.

08-28-2003, 10:21 PM	#4
slvrd1991 Registered User Join Date: Dec 2002 Location: Fl Posts: 28	i think that 700r-4, th400, and th-350 aree the same

08-30-2003, 12:07 PM	#6
the baron Registered User Join Date: Mar 2003 Location: Liège , Belgium Posts: 263	Thanks Guys , I think the better option right now is to dismantle both pieces and check them... In the worst case , I will have to use the TH400 yoke and adapt the Burb drive shaft , no big deal. I'm just worried about the two trannies lengths , I hope I won't have to shorten that drive shaft... We'll see , I'll take some pic's next week and post them here have a nice weekend The Baron



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