4L80E to SM465 Computer Problems??

[yellowK20]

I read some where that if you remove the 4L80E from a TBI truck it will cause weird issues with the ECM because its no longer getting a signal from the trans,

What's all involved in removing that stuff with out ruining it ?I'd like to use it in another project.


I have a Factory 91 R and V series Wiring Book, I'm just hoping its all gonna be a no cutting type of deal

 

[buefchris]

GM efi's need a speed sensor to operate correctly.
As long as your trasfer case has a hole for a sensor and the reluctor ring on the output shaft, you should be good.
Or dakota digital makes a speed sensor that goes between the speedo cable and the t-case.

 

[82355]

The early ones don't. 1987-1989 TBI uses mechanical speedometers.

Martin

 

[yellowK20]

Its a 91 R3500 so its a 2-wheel drive , BUT I do have a 4L80E/NP205. which I might use if time gets short, But I want to use SM465 doubler setup

 

[sweetk30]

The early ones don't. 1987-1989 TBI uses mechanical speedometers.

Martin

but have a sensor in the back of the speedo head.

 

[sweetk30]

I read some where that if you remove the 4L80E from a TBI truck it will cause weird issues with the ECM because its no longer getting a signal from the trans,

What's all involved in removing that stuff with out ruining it ?I'd like to use it in another project.


I have a Factory 91 R and V series Wiring Book, I'm just hoping its all gonna be a no cutting type of deal

use the 205 from the 4l80-e with electric speedo on it. then swap the prom in the computer to a stick shift prom. should solve the problems.

 

[yellowK20]

Could i use the Non VSS NP205 with the Dakota digital adapter???

 

[sweetk30]

prob could never tryed

 

[yellowK20]

I just Don't want to split up the 4L80E from its matching 205

 

[dave w]

I would reprogram the PROM to manual trans, and figure out a way to send a 2K VSS pulse directly to pin F16 on the PCM.

 

[yellowK20]

I'm not set-up for re-programing , I'd have to send it out

 

[dave w]

I'm not set-up for re-programing , I'd have to send it out

Send me a PM, maybe we can figure something out?

dave w