The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 01-31-2019, 03:37 PM   #1
i_live_in_canada
Registered User
 
Join Date: Apr 2017
Location: lacrete alberta
Posts: 16
th350 electronic speedo??

I just swapped a vortec 350/th350 combo in my 1990 Chevy and now I'm wondering how I can make my speedo work. I read something about swapping the speedo sender on the 700r4 into the th350 tail housing. but im not sure if that will work. anyone done this before??

thanks, Tim
i_live_in_canada is offline   Reply With Quote
Old 02-01-2019, 10:08 AM   #2
speedygonzales
Registered User
 
speedygonzales's Avatar
 
Join Date: Jan 2006
Location: Smithfield, VA
Posts: 1,436
Re: th350 electronic speedo??

I wasn't aware the 700R4 was ever electronic. I thought by that time it had switch to the 4L60 label. None the less here are some search results I got for you.

http://www.oldengine.org/unfaq/leadfoot/th350in.htm

https://www.youtube.com/watch?v=Hy7hPPIXk5M

https://www.youtube.com/watch?v=WTngjBKes00

Also Monster transmissions has good technical links

https://www.monstertransmission.com/...nfo_ep_42.html
__________________
99 Z71 (98 body style)
Pride and joy
speedygonzales is offline   Reply With Quote
Old 02-01-2019, 11:00 AM   #3
Texasdeere
Registered User
 
Texasdeere's Avatar
 
Join Date: Sep 2006
Location: Alvin, Texas
Posts: 705
Re: th350 electronic speedo??

I believe you can just swap the mechanical speedo sender from the tailshaft housing with your old digital one from the 700R4.

My 1988 C3500 TH400 had a digital sender in the tailshaft. I am pretty sure I swapped it over to my built 700R4 when I changed out the transmissions.
__________________
1988 GMC C3500 Dually SLE Club Coupe 7.4 TH700R4 3.73 Quick Silver/Ice Blue
2005 Chevy K2500HD CC/LB 6.6 Allison 3.73 Silver Birch
Texasdeere is offline   Reply With Quote
Old 02-01-2019, 02:14 PM   #4
Stormin08
Registered User
 
Stormin08's Avatar
 
Join Date: Sep 2018
Location: Moss Bluff, LA
Posts: 306
Re: th350 electronic speedo??

my 89 700r4 is electronic speedo output at the tail shaft...i just deleted all the factory ECM and wires, i am going the other way and installing a mechanical drive (sensor conversion). along with vacuum control rather than electronic.
Stormin08 is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -4. The time now is 01:32 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com