Auto trans swap into 79 GMC 4WD? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Transmission - Rearend
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 12-19-2011, 05:11 PM
Registered User
 
Join Date: Dec 2011
Location: United States
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Auto trans swap into 79 GMC 4WD?

Got a 79 GMC 4WD. Currently it has a manual trans with a NP-205 transfer case, i know this because of other info and pics i got off this site. What I had in mind was an automatic trans swap. Which would be a better choice TH 350 or 400? Clearly I need a trans with the correct tail piece as it bolts directly to the 205. Will any 350-400 4WD 'bolt up' ? I'm not sure how many configurations of this particular trans there are that mate to a NP 205. Would this be considered a relatively straightforward swap? Any info would be greatly appreciated, Thanks!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-19-2011, 05:35 PM
Crosley's Avatar
Hotrodders.com Moderator
 
Last wiki edit: T-350 rebuild tech
Last journal entry: Bar under the dash
Last photo:
Join Date: Nov 2002
Location: ... USA
Posts: 8,083
Wiki Edits: 1659

Thanks: 328
Thanked 99 Times in 95 Posts
welcome to Hotrodders.com

I edited the thread title to provide the members here an idea of what your question is about rather than simply "Auto?"
__________________
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-19-2011, 05:37 PM
Registered User
 
Join Date: Dec 2011
Location: United States
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks, kinda new here
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-20-2011, 07:28 AM
Registered User
 
Last photo:
Join Date: Jul 2011
Location: usa
Posts: 130
Wiki Edits: 0

Thanks: 3
Thanked 1 Time in 1 Post
Your best chose would be th350 with 208 t.case the 208 has lower gear ratio in low range .try and get it all together .drive shafts cross member shifter however to do this you would almost have to find truck with the parts still in it ... To just change out the trans you would need the correct adapter and splin count the th350 has 27 splin and sm465 I think is 10 splin
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-20-2011, 07:50 AM
Registered User
 
Join Date: Dec 2011
Location: United States
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Yeah I considered a 'donor' truck was hoping for a relatively easy swap, think you're right on the manual trans spline count also
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-20-2011, 07:57 AM
Registered User
 
Last photo:
Join Date: Jul 2011
Location: usa
Posts: 130
Wiki Edits: 0

Thanks: 3
Thanked 1 Time in 1 Post
Check with advance adapters they should have what you need to swap trannys out .wharf gear ratio do you have the stock gears are around 2.73 .and what size tires
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-20-2011, 09:38 AM
Registered User
 
Last photo:
Join Date: Jul 2011
Location: usa
Posts: 130
Wiki Edits: 0

Thanks: 3
Thanked 1 Time in 1 Post
I tried to post pictures of the adapter that you would need .it is a factory adapter check on eBay that's were I got mine . Then you can swap out the input gear on your 205 to a 27 splin .the th350 and adapter is 25 inch long . Plus 1 3/4 tail shaft . Hope this helps drive shafts should be ok but you'll have to measure and make sure
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-20-2011, 01:18 PM
Registered User
 
Join Date: Dec 2011
Location: United States
Posts: 5
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
yeah 2.73 gears and 31x10.50 tires. Looks like Advance Adapters has what I need for the conversion. Thanks very much louis165, I appreciate it!
Reply With Quote Quick reply to this message

Recent Transmission - Rearend posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
which auto trans for 56 chev? db flyer Transmission - Rearend 27 10-27-2010 05:01 PM
Auto trans swap on a corvette Pupsvette76 Transmission - Rearend 6 12-13-2009 04:14 PM
questions for a auto to manual trans swap johnnyt5646 Transmission - Rearend 0 02-05-2009 01:52 PM
1993 Silverado K1500 auto to manual trans swap.. FinishLine Transmission - Rearend 1 01-11-2009 08:42 PM
swap 3 on the tree for auto trans. dragon wagon Transmission - Rearend 3 03-06-2004 02:38 PM


All times are GMT -6. The time now is 01:45 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.