700r swap, slight problem... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

runrx02 · 07-04-2008, 11:48 AM

I am in the process of buttoning up my 700r swap in my 74 2wd and have encountered a slight problem. The weight on the trans end of the driveshaft hits the mount for the torque arm (which the truck obviously doesn't use). Has anyone else encountered this problem?
Does the weight come off?
Should I carefully cut the mount off?
Or do I need to swap yokes?

thanks

here are a few pics...

COMP · 07-04-2008, 12:15 PM

i need to do this swap,,, non of my shafts look like that,,,i'd look for a used yoke if it doesn't fit the 700...please post everything you can on this swap

runrx02 · 07-04-2008, 01:03 PM

it fits into the trans, just not all the way because of the weight hitting the trans

swap is very easy, just bolts right in. I did have to drill holes for the crossmember tho. From what I gather, some do and some don't. You will need a different dipstick, a tv cable, a mechanical speedo adapter if you purchase a 700 with electronic speedo sensor, and a relay kit for the torque converter lockup. Also, I would install the constant pressure kit from TCI if you can afford it, just for peace of mind.

bowtiecb · 07-04-2008, 01:28 PM

you can just find a driveshaft from a 86-87, i have a 86 and mine does not have that big drum on the end or swap tail housings

COMP · 07-04-2008, 03:36 PM

Quote:

Originally Posted by bowtiecb

you can just find a driveshaft from a 86-87, i have a 86 and mine does not have that big drum on the end or swap tail housings

i have 76-77-78 's and don't have it

Spray-Bomb · 07-04-2008, 04:21 PM

I would just get a different yoke

One from a TH350 trans will work also

runrx02 · 07-04-2008, 05:52 PM

I have a different yoke from an old project, but the u-joint holes are larger than the truck d-shaft holes. Do they make u-joints with the smaller size on one end and larger on the other?

I was able to get the weight off...it seems to be a balancer because it was rubber mounted to the yoke. I can now get the d-shaft installed, but there is still a lip on the yoke that is limiting the inward movement of the d-shaft. There is probably a little more than 1/4" of inward play with the suspension under full weight, which I'm thinking is not enough.

Spray-Bomb · 07-04-2008, 06:42 PM

They do make adapter U-joints

Just measure the two & see if your parts store has one

COMP · 07-04-2008, 07:52 PM

they make U-joints with two different caps

D13 · 07-07-2008, 07:54 AM

That's a yoke out of a van, right? I ask because I see that damper on the M vans but did not have one on my 1990 FST. Both were 4.3 auto.

runrx02 · 07-07-2008, 08:26 AM

Bad news fellas. I got the weight/dampener off and the dshaft is still too long. Also tried a different yoke to no avail. So looks like I'm going to have to get the driveshaft cut. Oh well, nothin's as simple as you hope, right?

07-04-2008, 11:48 AM	#1
runrx02 Registered User Join Date: Mar 2007 Location: Akron, Ohio Posts: 30	700r swap, slight problem... I am in the process of buttoning up my 700r swap in my 74 2wd and have encountered a slight problem. The weight on the trans end of the driveshaft hits the mount for the torque arm (which the truck obviously doesn't use). Has anyone else encountered this problem? Does the weight come off? Should I carefully cut the mount off? Or do I need to swap yokes? thanks here are a few pics...

07-04-2008, 12:15 PM	#2
COMP Registered User Join Date: May 2008 Location: Eville IN. Posts: 365	Re: 700r swap, slight problem... i need to do this swap,,, non of my shafts look like that,,,i'd look for a used yoke if it doesn't fit the 700...please post everything you can on this swap Last edited by COMP; 07-04-2008 at 12:15 PM.

07-04-2008, 01:03 PM	#3
runrx02 Registered User Join Date: Mar 2007 Location: Akron, Ohio Posts: 30	Re: 700r swap, slight problem... it fits into the trans, just not all the way because of the weight hitting the trans swap is very easy, just bolts right in. I did have to drill holes for the crossmember tho. From what I gather, some do and some don't. You will need a different dipstick, a tv cable, a mechanical speedo adapter if you purchase a 700 with electronic speedo sensor, and a relay kit for the torque converter lockup. Also, I would install the constant pressure kit from TCI if you can afford it, just for peace of mind.

07-04-2008, 01:28 PM	#4
bowtiecb Registered User Join Date: Oct 2006 Location: alabama Posts: 79	Re: 700r swap, slight problem... you can just find a driveshaft from a 86-87, i have a 86 and mine does not have that big drum on the end or swap tail housings Last edited by bowtiecb; 07-04-2008 at 01:29 PM.

07-04-2008, 04:21 PM	#6
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: 700r swap, slight problem... I would just get a different yoke One from a TH350 trans will work also __________________ Just not low enough... ----------------------------- Sinister Killer

07-04-2008, 05:52 PM	#7
runrx02 Registered User Join Date: Mar 2007 Location: Akron, Ohio Posts: 30	Re: 700r swap, slight problem... I have a different yoke from an old project, but the u-joint holes are larger than the truck d-shaft holes. Do they make u-joints with the smaller size on one end and larger on the other? I was able to get the weight off...it seems to be a balancer because it was rubber mounted to the yoke. I can now get the d-shaft installed, but there is still a lip on the yoke that is limiting the inward movement of the d-shaft. There is probably a little more than 1/4" of inward play with the suspension under full weight, which I'm thinking is not enough. Last edited by runrx02; 07-04-2008 at 05:55 PM.

07-04-2008, 06:42 PM	#8
Spray-Bomb Texas Big Wig Join Date: Jan 2007 Location: Mineola, Texas Posts: 5,620	Re: 700r swap, slight problem... They do make adapter U-joints Just measure the two & see if your parts store has one __________________ Just not low enough... ----------------------------- Sinister Killer

07-04-2008, 07:52 PM	#9
COMP Registered User Join Date: May 2008 Location: Eville IN. Posts: 365	Re: 700r swap, slight problem... they make U-joints with two different caps

07-07-2008, 07:54 AM	#10
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: 700r swap, slight problem... That's a yoke out of a van, right? I ask because I see that damper on the M vans but did not have one on my 1990 FST. Both were 4.3 auto. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

07-07-2008, 08:26 AM	#11
runrx02 Registered User Join Date: Mar 2007 Location: Akron, Ohio Posts: 30	Re: 700r swap, slight problem... Bad news fellas. I got the weight/dampener off and the dshaft is still too long. Also tried a different yoke to no avail. So looks like I'm going to have to get the driveshaft cut. Oh well, nothin's as simple as you hope, right?



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