1985 Camaro spedo T5 trans and 91 Firebird ECM
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Joined: May 2012
Posts: 705
Likes: 95
From: Manitoba, Canada
Car: 1987 Z28 IROC
Engine: 6.2L
Transmission: 700R4
Axle/Gears: 3.23
1985 Camaro spedo T5 trans and 91 Firebird ECM
I have a 1985 Camaro that was originally a 305 TPI w/auto trans. Years ago it was converted to a T5 with a carbed engine and all wiring ripped out. Now I am putting it back to TPI and have a 1991 Firebird L98 to use as a donor for wiring.
How or what do I need to hook up the correct VSS so that the ecm gets the right signal, the cruise will work and the cable driven spedo will work?
How or what do I need to hook up the correct VSS so that the ecm gets the right signal, the cruise will work and the cable driven spedo will work?
Joined: Dec 2004
Posts: 16,740
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1985 Camaro spedo T5 trans and 91 Firebird ECM
http://www.tpiparts.net/inc/sdetail/7587, I assume the t5 is cable drive ? If you need any reprograming done send me a pm I can assist.
Thread Starter
Senior Member



Joined: May 2012
Posts: 705
Likes: 95
From: Manitoba, Canada
Car: 1987 Z28 IROC
Engine: 6.2L
Transmission: 700R4
Axle/Gears: 3.23
Re: 1985 Camaro spedo T5 trans and 91 Firebird ECM
http://www.tpiparts.net/inc/sdetail/7587, I assume the t5 is cable drive ? If you need any reprograming done send me a pm I can assist.
Joined: Dec 2004
Posts: 16,740
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1985 Camaro spedo T5 trans and 91 Firebird ECM
If the t5 is a cable drive speedometer there is not a 4k ppm vss that will just screw on and work. Jags that run, tpi parts and painless wiring would be your choices. I just assume you are using a 1227730 ecm .
Thread Starter
Senior Member



Joined: May 2012
Posts: 705
Likes: 95
From: Manitoba, Canada
Car: 1987 Z28 IROC
Engine: 6.2L
Transmission: 700R4
Axle/Gears: 3.23
Re: 1985 Camaro spedo T5 trans and 91 Firebird ECM
I have my cluster out to fix the trip odometer and see that there is a vss on the back. From what I read the older cars had a 2000 pulse signal and the 90-92 had 4000 pulse. Is there an item that will convert the 2000 pulse to 4000 pulse?...well one that would be any cheaper than the Tpiparts vss? I have all a complete 1991 Firebird I am using for parts. Is there anything off that car I could use?
Joined: Dec 2004
Posts: 16,740
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1985 Camaro spedo T5 trans and 91 Firebird ECM
The only other think I can think of if the brown wire from the buffer is a 2k optical signal that use to go to the ecm. The memcal can be reprogramed for a optical input and that signal would go to pin c6 on the 730 ecm. If you are wanting that done I can assist send me a pm.
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