engine & tranny swap on my Burb - The 1947 - Present Chevrolet & GMC Truck Message Board Network

the baron · 10-23-2003, 06:22 AM

Hi all ,
I told you a long while ago I was restauring a Burb 6.2 Diesel/TH700R4 , swapping that combo by the engine /tranny I have now in my C10 long bed ( Olds 350ci/TH400 ).

So far , the 6.2 & TH700 are out of the Burb and I'm preparing the engine compartiment to install the other combo.

My question here goes about the transmission shaft , being in one piece on the Burb , in two pieces on the C10.

I thought to put the one piece shaft on the TH400 , using the existing U joint.

the question : when the RR axle goes up & down , does the outcoming shaft on the TH400 slide as it did on the TH700 or is it a special feature ( fixed shaft ) as the former shaft was in two pieces ( the sliding part being then on the transmission shaft ? )

Am I understandable here ?

Or maybe , to simplify my question , was there a difference between a TH400 for a 2WD Burb and a TH400 for a 2WD C10 ?

Thank you for the bunch of replies I will certainly get on this topic...

The Baron

**old Rusty C10** · 10-23-2003, 11:03 AM

that is a question i would pose to the service manager at your local dealership he would know id bet

MylilBowTie · 10-23-2003, 12:37 PM

The difference is the bolt on yoke th400 uses a 2 piece driveshaft. The slip on yoke uses a one piece driveshaft. The wheelbase from the truck (131.5) to the suburban (129.5) is 2 in. All the play in a 2 piece driveshaft is in the carrier bearing, and the one piece in the slip on yoke.

You need to measure your u-joints to see what sizes they are. The one piece driveshaft will more than likely be too short. 700r4 measures 30 3/4 in bellhousing to tailshaft end, th400 short tail is 28 3/8. Difference is 2 3/8 shorter plus the 2in (wheelbase) so that's 4 3/8s to short to use the one piece driveshaft.

I would get the engine and transmission in first. Then measure from the rear tailshaft end to the pinion yoke on the flat part where the u-joint straps go. Take that number and have a driveshaft made with a slip-on yoke. Or use the two piece and have rear shaft of the two piece lengthened.

Someone speak up if Im wrong, Im currently having to deal with this situation. Just trying to help out.

10-23-2003, 06:22 AM	#1
the baron Registered User Join Date: Mar 2003 Location: Liège , Belgium Posts: 263	engine & tranny swap on my Burb Hi all , I told you a long while ago I was restauring a Burb 6.2 Diesel/TH700R4 , swapping that combo by the engine /tranny I have now in my C10 long bed ( Olds 350ci/TH400 ). So far , the 6.2 & TH700 are out of the Burb and I'm preparing the engine compartiment to install the other combo. My question here goes about the transmission shaft , being in one piece on the Burb , in two pieces on the C10. I thought to put the one piece shaft on the TH400 , using the existing U joint. the question : when the RR axle goes up & down , does the outcoming shaft on the TH400 slide as it did on the TH700 or is it a special feature ( fixed shaft ) as the former shaft was in two pieces ( the sliding part being then on the transmission shaft ? ) Am I understandable here ? Or maybe , to simplify my question , was there a difference between a TH400 for a 2WD Burb and a TH400 for a 2WD C10 ? Thank you for the bunch of replies I will certainly get on this topic... The Baron __________________ 1982 Suburban 2WD , 260ci Olds engine,TH400 , will get a 1979 front clip , might be ready in ... 2016 1985 Chevy Van ( 305/350 ) , "Kellogg" equipped , my actual D.D. 1960 Girl Friend , frame still good , body has some dents

10-23-2003, 11:03 AM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,316	that is a question i would pose to the service manager at your local dealership he would know id bet __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

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10-23-2003, 12:37 PM	#3
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	The difference is the bolt on yoke th400 uses a 2 piece driveshaft. The slip on yoke uses a one piece driveshaft. The wheelbase from the truck (131.5) to the suburban (129.5) is 2 in. All the play in a 2 piece driveshaft is in the carrier bearing, and the one piece in the slip on yoke. You need to measure your u-joints to see what sizes they are. The one piece driveshaft will more than likely be too short. 700r4 measures 30 3/4 in bellhousing to tailshaft end, th400 short tail is 28 3/8. Difference is 2 3/8 shorter plus the 2in (wheelbase) so that's 4 3/8s to short to use the one piece driveshaft. I would get the engine and transmission in first. Then measure from the rear tailshaft end to the pinion yoke on the flat part where the u-joint straps go. Take that number and have a driveshaft made with a slip-on yoke. Or use the two piece and have rear shaft of the two piece lengthened. Someone speak up if Im wrong, Im currently having to deal with this situation. Just trying to help out.



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