Dive shaft length on lowered truck - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dan42 · 08-09-2007, 11:52 PM

Got a question. On my '67, I'm gonna swap the motor and tranny out (probably a 383 stroker and and a th350) but I was wondering on how to measure for a new driveshaft. Do I lower it before I put the motor in, or after, and then measure for the drive shaft? I want to put a one piece in. Are there preset measurements? Not sure if I am gonna use a long shaft or a short shaft tranny. Preferably, I would like to put everything in at the same time, not have to put the motor and tranny in, then measure. Any advise would be appreciated.

jorgensensc · 08-09-2007, 11:56 PM

I'm curious too. I can get a drive shaft cut down for 45.00, so if I can get a long one for cheap, Then I could get it cut down and have a one piece and not worry about the silly bearing. mines a swb with a 350/350 in it.

dan42 · 08-10-2007, 12:46 AM

ttt

cdowns · 08-10-2007, 07:02 AM

its best to have everything installed in the final position then measure according to directions from your driveshaft shop thats the only way i know of getting a proper fit the first try

Phaedrus · 08-10-2007, 07:39 AM

With the motor/tranny installed and the vehicle at ride height (weight on the suspension), measure from the flats on the diff yoke (the center of the u-joint) to the seal on the tranny. That's how we have customers measure theirs for us, but it's probably best to talk to your local shop or who ever will be doing the work for ya.

ChevLoRay · 08-10-2007, 09:12 AM

I have a 4" drop in the rear. Shock relocators in place and the drive shaft (a 2-piece) unit is unchanged. Check with Early Classic, for example, to see what they recommend. Their catalog doesn't mention it even with a 6" drop. If you have leaf springs you may be looking at a different event. But the '96 I have, with leaf springs, is also dropped 4" with no change in driveshaft length or mounting.

08-09-2007, 11:52 PM	#1
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Dive shaft length on lowered truck Got a question. On my '67, I'm gonna swap the motor and tranny out (probably a 383 stroker and and a th350) but I was wondering on how to measure for a new driveshaft. Do I lower it before I put the motor in, or after, and then measure for the drive shaft? I want to put a one piece in. Are there preset measurements? Not sure if I am gonna use a long shaft or a short shaft tranny. Preferably, I would like to put everything in at the same time, not have to put the motor and tranny in, then measure. Any advise would be appreciated. __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

08-09-2007, 11:56 PM	#2
jorgensensc Registered User Join Date: Jul 2003 Location: Cypress, Tx Posts: 4,005	Re: Dive shaft length on lowered truck I'm curious too. I can get a drive shaft cut down for 45.00, so if I can get a long one for cheap, Then I could get it cut down and have a one piece and not worry about the silly bearing. mines a swb with a 350/350 in it. __________________ 1972 C20 Suburban- Big Blue Betty '56 Chevy Bel Air Sedan- Frame up Restoration -What would you attempt to achieve if you knew you could not fail?- -I Refuse To Tiptoe Through Life, Only To Arrive Safely At Death's Door- R.I.P. EAST SIDE LOW LIFE

08-10-2007, 12:46 AM	#3
dan42 Registered User Join Date: Feb 2007 Location: Cali Central Coast Posts: 5,191	Re: Dive shaft length on lowered truck ttt __________________ '67 SWB Fleetside ZZ4/350/Tremec 5-speed/4link/Scott's IFS - and fun as heck! SOLD Click here to support the board Philippians 4: 6-7

08-10-2007, 07:02 AM	#4
cdowns Senior Member Join Date: Jan 2003 Location: daytonabeach Posts: 22,956	Re: Dive shaft length on lowered truck its best to have everything installed in the final position then measure according to directions from your driveshaft shop thats the only way i know of getting a proper fit the first try __________________ 71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY

08-10-2007, 07:39 AM	#5
Phaedrus Registered User Join Date: Jun 2006 Location: Sioux Falls, SD Posts: 67	Re: Dive shaft length on lowered truck With the motor/tranny installed and the vehicle at ride height (weight on the suspension), measure from the flats on the diff yoke (the center of the u-joint) to the seal on the tranny. That's how we have customers measure theirs for us, but it's probably best to talk to your local shop or who ever will be doing the work for ya.

08-10-2007, 09:12 AM	#6
ChevLoRay Old Skool Club Join Date: Jun 2001 Location: Benton, AR "The Heart of Arkansas" Posts: 10,880	Re: Dive shaft length on lowered truck I have a 4" drop in the rear. Shock relocators in place and the drive shaft (a 2-piece) unit is unchanged. Check with Early Classic, for example, to see what they recommend. Their catalog doesn't mention it even with a 6" drop. If you have leaf springs you may be looking at a different event. But the '96 I have, with leaf springs, is also dropped 4" with no change in driveshaft length or mounting. __________________ Member Nr. 2770 '96 GMC Sportside; 4.3/SLT - Daily driven....constantly needs washed. '69 C-10 SWB; 350/TH400 - in limbo The older I get, the better I was.



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