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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: lpapa15 on August 14, 2010, 07:59:47 pm

Title: manual to automatic conversion
Post by: lpapa15 on August 14, 2010, 07:59:47 pm
I own a 79 4x4 Cheyenne 3 speed manual I want to convert it to an automatic on the tree.  I have the new steering column with the shifter on the tree and a new th400.  is there any advice on the conversion?    Manual to auto...
Title: Re: manual to automatic conversion
Post by: Swims350 on August 14, 2010, 09:27:52 pm
you get the column linkage for the auto? Also gonna need the correct t-case adapter to go from a th400 to your t-case. There could be a difference in case length of the transmissions too which could mean drilling new crossmember holes or driveshaft work.
Title: Re: manual to automatic conversion
Post by: Captkaos on August 16, 2010, 05:37:19 pm
You need the mount on the frame for the shift lever along with the linkages.  you will need a different driveshaft and yoke alone with moving the crossmember.