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Old 09-19-2009, 05:09 PM   #1
Rodd Zane
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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
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Last edited by Rodd Zane; 09-19-2009 at 05:14 PM.
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Old 09-19-2009, 05:13 PM   #2
Longhorn Man
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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.
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Old 09-19-2009, 05:15 PM   #3
Smitty
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Re: Switch from manual to auto transmission

I think that the last item Longhorn meant was a radiator with the trans cooler!
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Old 09-19-2009, 05:36 PM   #4
Longhorn Man
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Re: Switch from manual to auto transmission

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I think that the last item Longhorn meant was a radiator with the trans cooler!
thanks i fixed it.
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Old 09-19-2009, 05:15 PM   #5
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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!!
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Last edited by Skirkpat; 09-19-2009 at 09:05 PM.
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Old 09-19-2009, 05:18 PM   #6
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Re: Switch from manual to auto transmission

Do they make aftermarket crossmember?
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Old 09-19-2009, 05:32 PM   #7
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Re: Switch from manual to auto transmission

Does anyone know what year crossmember will work with the 68
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Old 09-19-2009, 05:41 PM   #8
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Re: Switch from manual to auto transmission

Th350 lengths are 6, 9, and 12
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Old 09-19-2009, 06:32 PM   #9
Smitty
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Re: Switch from manual to auto transmission

You surprised be there Longhorn! Thought maybe it was because I didn't have my glasses on.
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Old 09-19-2009, 06:46 PM   #10
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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
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Last edited by john; 09-19-2009 at 07:11 PM.
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Old 09-19-2009, 09:04 PM   #11
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Re: Switch from manual to auto transmission

Quote:
Originally Posted by Tx Firefighter View Post
Th350 lengths are 6, 9, and 12
ooop's, thank's for catching that. I fixed it.
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Old 09-19-2009, 09:04 PM   #12
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Re: Switch from manual to auto transmission

Quote:
Originally Posted by Tx Firefighter View Post
Th350 lengths are 6, 9, and 12
ooop's, thank's for catching that. I fixed it. I knew it was a multiple
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1969 4 WD Suburban
1970 1 Ton Dually....Misfit


oh, and a 2001 HD 2500, 8.1 Allison Shortbed 4 Door
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Old 09-19-2009, 09:06 PM   #13
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Re: Switch from manual to auto transmission

Quote:
Originally Posted by Tx Firefighter View Post
Th350 lengths are 6, 9, and 12
Thank you sir, I fixed my mistake....
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1969 4 WD Suburban
1970 1 Ton Dually....Misfit


oh, and a 2001 HD 2500, 8.1 Allison Shortbed 4 Door
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Old 09-20-2009, 12:04 AM   #14
Terakilla
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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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