Switch from manual to auto transmission - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Rodd Zane · 09-19-2009, 05:09 PM

I've got a 68 Chevy 2 wheel drive 1/2 ton truck with a manual 3 on the tree. I want to swap to a auto probably a 350, will the existing cross member work with that trans? Also some one told me the dive shaft will work, any thoughts?

Ken

Longhorn Man · 09-19-2009, 05:13 PM

your 3 speed doesn't have a crossmember, just mounts to the bellhousing.
You'll need;
Crossmember
tranny
torque converter
speedo cable
tranny mount
most likely driveshaft or mods to yours
Kickdown cable
cooler lines
shifter linkages
auto column
radiator with trans cooler

Skirkpat · 09-19-2009, 05:15 PM

the crossmember that the bellhousing bolts to will need to be removed (8 rivits), an automatic trans cross member will need to be found, if you use an 9 inch tail housing T350 you can use your driveshaft "I think" just measure before you buy the automatic,there are 3 different lengths 6,9, and 12 in tailhousings. good luck!!

**Smitty** · 09-19-2009, 05:15 PM

I think that the last item Longhorn meant was a radiator with the trans cooler!

Rodd Zane · 09-19-2009, 05:18 PM

Do they make aftermarket crossmember?

Rodd Zane · 09-19-2009, 05:32 PM

Does anyone know what year crossmember will work with the 68

Longhorn Man · 09-19-2009, 05:36 PM

Quote:

Originally Posted by Smitty

I think that the last item Longhorn meant was a radiator with the trans cooler!

thanks i fixed it.

Tx Firefighter · 09-19-2009, 05:41 PM

Th350 lengths are 6, 9, and 12

**Smitty** · 09-19-2009, 06:32 PM

You surprised be there Longhorn! Thought maybe it was because I didn't have my glasses on.

**john** · 09-19-2009, 06:46 PM

Welcome to the board. To answer your ? yes there is an aftermarket X member. I would look on the parts board for a good used one, probably cheaper. heres a link to ECE.
http://www.earlyclassic.com/catalog.aspx

Skirkpat · 09-19-2009, 09:04 PM

Quote:

Originally Posted by Tx Firefighter

Th350 lengths are 6, 9, and 12

ooop's, thank's for catching that. I fixed it.

Skirkpat · 09-19-2009, 09:04 PM

Quote:

Originally Posted by Tx Firefighter

Th350 lengths are 6, 9, and 12

ooop's, thank's for catching that. I fixed it. I knew it was a multiple

Skirkpat · 09-19-2009, 09:06 PM

Quote:

Originally Posted by Tx Firefighter

Th350 lengths are 6, 9, and 12

Thank you sir, I fixed my mistake....

Terakilla · 09-20-2009, 12:04 AM

I have a LS motor with a 4L60-E trans. Had to move new motor back 2 inches for newer single piece straight driveshaft and just used a piece of angle iron for a trans member, no problems so far and free, C Chanel will work too. If u wanna use the old driveshaftll it'll have to be cut, maybe find one off a caprice or similer like I did about the right length.

09-19-2009, 05:09 PM	#1
Rodd Zane Registered User Join Date: Sep 2009 Location: Hogansville, Georgia Posts: 4	Switch from manual to auto transmission I've got a 68 Chevy 2 wheel drive 1/2 ton truck with a manual 3 on the tree. I want to swap to a auto probably a 350, will the existing cross member work with that trans? Also some one told me the dive shaft will work, any thoughts? Ken Attached Images Last edited by Rodd Zane; 09-19-2009 at 05:14 PM.

09-19-2009, 05:13 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,690	Re: Switch from manual to auto transmission your 3 speed doesn't have a crossmember, just mounts to the bellhousing. You'll need; Crossmember tranny torque converter speedo cable tranny mount most likely driveshaft or mods to yours Kickdown cable cooler lines shifter linkages auto column radiator with trans cooler Last edited by Longhorn Man; 09-19-2009 at 05:35 PM.

09-19-2009, 05:15 PM	#3
Skirkpat Registered User Join Date: Dec 2008 Location: K.C. Missouri Posts: 1,024	Re: Switch from manual to auto transmission the crossmember that the bellhousing bolts to will need to be removed (8 rivits), an automatic trans cross member will need to be found, if you use an 9 inch tail housing T350 you can use your driveshaft "I think" just measure before you buy the automatic,there are 3 different lengths 6,9, and 12 in tailhousings. good luck!! __________________ 1969 Short Stepside 1969 4 WD Suburban 1970 1 Ton Dually....Misfit oh, and a 2001 HD 2500, 8.1 Allison Shortbed 4 Door Last edited by Skirkpat; 09-19-2009 at 09:05 PM.

09-19-2009, 05:15 PM	#4
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,136	Re: Switch from manual to auto transmission I think that the last item Longhorn meant was a radiator with the trans cooler! __________________ Smitty '71 Short Fleetside Spring Valley, Ca.

09-19-2009, 05:18 PM	#5
Rodd Zane Registered User Join Date: Sep 2009 Location: Hogansville, Georgia Posts: 4	Re: Switch from manual to auto transmission Do they make aftermarket crossmember?

09-19-2009, 05:32 PM	#6
Rodd Zane Registered User Join Date: Sep 2009 Location: Hogansville, Georgia Posts: 4	Re: Switch from manual to auto transmission Does anyone know what year crossmember will work with the 68

09-19-2009, 05:41 PM	#8
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Switch from manual to auto transmission Th350 lengths are 6, 9, and 12 __________________ I'm on the Instagram- @Gearhead_Kevin

09-19-2009, 06:32 PM	#9
Smitty Senior Member Join Date: Dec 1999 Location: Spring Valley, Ca. Posts: 1,136	Re: Switch from manual to auto transmission You surprised be there Longhorn! Thought maybe it was because I didn't have my glasses on. __________________ Smitty '71 Short Fleetside Spring Valley, Ca.

09-19-2009, 06:46 PM	#10
john member #16 Join Date: Dec 1999 Location: Yuba City Ca. Posts: 3,618	Re: Switch from manual to auto transmission Welcome to the board. To answer your ? yes there is an aftermarket X member. I would look on the parts board for a good used one, probably cheaper. heres a link to ECE. http://www.earlyclassic.com/catalog.aspx Attached Images __________________ john http://67-72chevytrucks.com/vboard/showgroups.php board vendors http://www.flickr.com/photos/1745471...7602865984234/ Last edited by john; 09-19-2009 at 07:11 PM.

09-20-2009, 12:04 AM	#14
Terakilla Registered User Join Date: Aug 2009 Location: Ft Stockton Texas Posts: 90	Re: Switch from manual to auto transmission I have a LS motor with a 4L60-E trans. Had to move new motor back 2 inches for newer single piece straight driveshaft and just used a piece of angle iron for a trans member, no problems so far and free, C Chanel will work too. If u wanna use the old driveshaftll it'll have to be cut, maybe find one off a caprice or similer like I did about the right length.

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