3 speed to auto driveshaft ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

redbaron69 · 08-13-2009, 12:18 PM

hey guys hope everybody doing good. my question is, my truck is a 3 speed now and puting in a auto. i got a 2 piece drive shaft what changes am i gonna have to make to the driveshaft to make it work thanks

BarryB · 08-13-2009, 01:04 PM

Does it have the three spd saginaw transmission??And your swapping in which automatic? If 3spd to a th350 If so, you should be able to just pull your manual trans, and swap the autoin it's place. The driveshaft should be the same. you'll need an automatic crossmember for trans.

redbaron69 · 08-13-2009, 04:33 PM

not sure if it a saginaw or not? how can i tell? just your standard 3 on the tree. and yes it will be a th350

Tx Firefighter · 08-13-2009, 05:47 PM

There are three different lengths of TH350 trans too, so you can't just generalize what will fit. You need to measure your current trans versus the new TH350.

08-13-2009, 12:18 PM	#1
redbaron69 Registered User Join Date: Jan 2009 Location: marion nc Posts: 588	3 speed to auto driveshaft ? hey guys hope everybody doing good. my question is, my truck is a 3 speed now and puting in a auto. i got a 2 piece drive shaft what changes am i gonna have to make to the driveshaft to make it work thanks __________________ 69 short fleet 350/350 "under construction" 70 short step 307/3 speed Last edited by redbaron69; 08-13-2009 at 12:19 PM.

08-13-2009, 01:04 PM	#2
BarryB Senior Member Join Date: Jul 2006 Location: Blountville, Tn. Posts: 3,904	Re: 3 speed to auto driveshaft ? Does it have the three spd saginaw transmission??And your swapping in which automatic? If 3spd to a th350 If so, you should be able to just pull your manual trans, and swap the autoin it's place. The driveshaft should be the same. you'll need an automatic crossmember for trans. __________________ We could learn a lot from crayons... Some are sharp; some are pretty;and some are dull. Some have weird names; and all are different colours;but they all have to live in the same box. You may be only one person in the world, But you may also be the world to one person. * Some mistakes are too much fun to only make once. Two rules in life. 1. Never sweat the small stuff! 2. Everything is small stuff!

08-13-2009, 04:33 PM	#3
redbaron69 Registered User Join Date: Jan 2009 Location: marion nc Posts: 588	Re: 3 speed to auto driveshaft ? not sure if it a saginaw or not? how can i tell? just your standard 3 on the tree. and yes it will be a th350 __________________ 69 short fleet 350/350 "under construction" 70 short step 307/3 speed

08-13-2009, 05:47 PM	#4
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: 3 speed to auto driveshaft ? There are three different lengths of TH350 trans too, so you can't just generalize what will fit. You need to measure your current trans versus the new TH350. __________________ I'm on the Instagram- @Gearhead_Kevin

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