73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: brandon6469 on June 07, 2015, 07:07:22 pm

Title: TH400 to 700R4 swap - lock up wiring
Post by: brandon6469 on June 07, 2015, 07:07:22 pm

I just swapped my TH400 for a 700R4.  I have EBL Flash and I want to control lockup from the computer.  I have the 3-wire connector that goes into the new transmission.  My question is what's the best way/place to find the wires in the wiring harness to connect the connector and operate lock up using the computer? 

Sent from my HTC6525LVW using Tapatalk

Title: Re: TH400 to 700R4 swap - lock up wiring
Post by: roundhouse on June 10, 2015, 09:36:47 pm

The 700 in my old truck didn't have any computer at all



Sent from my iPhone using Tapatalk

Title: Re: TH400 to 700R4 swap - lock up wiring
Post by: Irish_Alley on June 10, 2015, 10:18:37 pm

check this (http://www.73-87chevytrucks.com/techinfo/7387CKMans//Wiring/ST386_83_1983_GM_Wiring_Manual_CK_P_G_10_to_30_and_ST.pdf#page=16) out page 16 bottom row

Title: Re: TH400 to 700R4 swap - lock up wiring
Post by: Irish_Alley on June 10, 2015, 10:20:47 pm

700r4 (MD8) Lock up problem (http://forum.73-87chevytrucks.com/smforum/index.php?topic=26982.msg224666#msg224666)

Title: Re: TH400 to 700R4 swap - lock up wiring
Post by: Irish_Alley on June 10, 2015, 10:21:42 pm

http://www.73-87.com/7387garage/drivetrain/lockup.htm

Title: Re: TH400 to 700R4 swap - lock up wiring
Post by: Irish_Alley on June 10, 2015, 10:23:02 pm

plus many more search for "700r4 lock up" (http://forum.73-87chevytrucks.com/smforum/index.php?action=search2)

Title: Re: TH400 to 700R4 swap - lock up wiring
Post by: brandon6469 on June 10, 2015, 10:58:48 pm

Thanks for the suggestions.  I wired up a manual switch for now, but it's popping fuses.  Maybe these links will help me figure out my next option.  Looks like more troubleshooting this weekend

Sent from my HTC6525LVW using Tapatalk