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12-24-2011, 02:21 PM
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#1 |
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Certified Pud Puller
Join Date: Nov 2005
Location: hollywood,MD
Posts: 105
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3 speed to TH350 swap
So I have a 84 short bed silverado and I want to take out the 3 speed and put in a auto. Does anybody know what all I will need? Short/intermediate/long shaft? the crossmember looks the same and i want to keep the 250 in it. thanks for any help.
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12-24-2011, 02:56 PM
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#2 |
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Registered User
Join Date: Oct 2011
Location: Emory TX
Posts: 900
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Re: 3 speed to TH350 swap
Don't hold me to this but i think that your three speed with bellhousing is the same lenght as a short shaft 350. Crossmember is the same.
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12-24-2011, 05:17 PM
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#3 |
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Registered User
 Join Date: Oct 2011
Location: Wildomar, CA
Posts: 466
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Re: 3 speed to TH350 swap
I'm pretty sure it is too.... Looked at doing this on my 78 at one point.
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12-24-2011, 07:35 PM
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#4 |
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Certified Pud Puller
Join Date: Nov 2005
Location: hollywood,MD
Posts: 105
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Re: 3 speed to TH350 swap
did any of the I-6's come with fuel injection?
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12-24-2011, 08:56 PM
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#5 |
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Robert Olson Transport
 
Join Date: Oct 2002
Location: recent transplant to NC USA
Posts: 20,310
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Re: 3 speed to TH350 swap
I dont recall any I6 EFI motors.. And IIRC on my76 I was able to swap in the th 350 for the s on the tree trans.. I changed out the pedals and the column to make it look factory
__________________
Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!! |
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12-25-2011, 03:18 AM
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#6 |
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Registered User
Join Date: May 2008
Location: salinas,california
Posts: 144
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Re: 3 speed to TH350 swap
I did the convertion from 3 speed to automatic. Ur guna have to move the crossmember a couple inches, hardly anything. Drive shaft is ok, u dont have to change that. Then i had to get tranny cooling lines.2 lines fron tranny to radiator. While i was underneath i change my u joints cause they were due. Also got a kickdown cable and speedo cable. Thats about it, and works good. I think i gota change rear end gears tho cause there for 3 speed manual not automatic
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12-25-2011, 09:34 AM
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#7 |
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Certified Pud Puller
Join Date: Nov 2005
Location: hollywood,MD
Posts: 105
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Re: 3 speed to TH350 swap
did you have to change the yoke that goes into the trans?
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12-25-2011, 08:53 PM
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#8 |
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Registered User
Join Date: May 2008
Location: salinas,california
Posts: 144
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Re: 3 speed to TH350 swap
Nope, you should be ok. I also ordered a floor shifter. I got a b&m rachet shifter on ebay.
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