HELP! 700R4 mechanical speedo to T5 electric speedo conversion
#1
Member
Thread Starter
HELP! 700R4 mechanical speedo to T5 electric speedo conversion
Need some help. I'm restoring an 87 IROC and made the decision while she is bare bones to convert the 700R4 over to a 5 speed. I bought a donor car (1991 Firebird) complete to do the swap. Just got the car on the lift to find the T5 is an electronic speedometer and my car is a cable driven car.
I look through the forum and can't seem to find a clear answer on how to make this electronic T5 work in my 87. These card aren't that technical, I didn't think, but is it as simple as taking a mechanical piece from a later T5 and swapping? Or can I take the mechanical part from the 700R to put into the T5??
Little help please.
I look through the forum and can't seem to find a clear answer on how to make this electronic T5 work in my 87. These card aren't that technical, I didn't think, but is it as simple as taking a mechanical piece from a later T5 and swapping? Or can I take the mechanical part from the 700R to put into the T5??
Little help please.
#2
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,401
Likes: 0
Received 215 Likes
on
201 Posts
Car: check
Engine: check
Transmission: check
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
The 700R4 VSS parts won't work, different mounting and form factor.
The stock cable driven stuff from an earlier T5 should bolt right in. Keep a hold of the electric VSS, they are no longer available new.
RBob.
The stock cable driven stuff from an earlier T5 should bolt right in. Keep a hold of the electric VSS, they are no longer available new.
RBob.
#3
Supreme Member
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
You need one of these
https://www.amazon.com/ACDelco-34521.../dp/B0013FSI6Y
And the correct gears for your rear end. Then a piece of metal to hold it in the transmission.
Speedo Gears Part NO. Driven Gears Part NO.
18 Brown 3987918 7 Purple 14071731
19 White 3987919 9 Red 14053347
20 Blue 3987920
21 Red 3987921
22 Gray 3987922
https://www.amazon.com/ACDelco-34521.../dp/B0013FSI6Y
And the correct gears for your rear end. Then a piece of metal to hold it in the transmission.
Speedo Gears Part NO. Driven Gears Part NO.
18 Brown 3987918 7 Purple 14071731
19 White 3987919 9 Red 14053347
20 Blue 3987920
21 Red 3987921
22 Gray 3987922
#4
Member
Thread Starter
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
You need one of these
https://www.amazon.com/ACDelco-34521.../dp/B0013FSI6Y
And the correct gears for your rear end. Then a piece of metal to hold it in the transmission.
Speedo Gears Part NO. Driven Gears Part NO.
18 Brown 3987918 7 Purple 14071731
19 White 3987919 9 Red 14053347
20 Blue 3987920
21 Red 3987921
22 Gray 3987922
https://www.amazon.com/ACDelco-34521.../dp/B0013FSI6Y
And the correct gears for your rear end. Then a piece of metal to hold it in the transmission.
Speedo Gears Part NO. Driven Gears Part NO.
18 Brown 3987918 7 Purple 14071731
19 White 3987919 9 Red 14053347
20 Blue 3987920
21 Red 3987921
22 Gray 3987922
Does this piece need to be for a 5 speed transmission or is a 700R the same? If not does anyone have this piece used? How do I know what gear to buy? My rear is a 3.23 9 bolt set up?
#5
Member
iTrader: (1)
Join Date: Dec 2014
Location: Dover, DE
Posts: 112
Likes: 0
Received 4 Likes
on
3 Posts
Car: 1990 & 1991 Firebird Formula 350's
Engine: 350 ci
Transmission: T 5 & 700r4
Axle/Gears: 3:23 & 3:27
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
go to this website...http://www.jagsthatrun.com/Pages/Spe...eedometer.html. pick the correct one. ( actually I have one I bought for my car and didn't use... will sell it for 90.00 shipped.) That part will convert your signal to electric pulse for your speedo. Now, forget about finding the correct drive and driven gears. Just get one of these and follow the directions and your trouble will be over. http://www.abbott-tach.com/era.htm
#6
Member
Thread Starter
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
go to this website...http://www.jagsthatrun.com/Pages/Spe...eedometer.html. pick the correct one. ( actually I have one I bought for my car and didn't use... will sell it for 90.00 shipped.) That part will convert your signal to electric pulse for your speedo. Now, forget about finding the correct drive and driven gears. Just get one of these and follow the directions and your trouble will be over. http://www.abbott-tach.com/era.htm
#7
Member
iTrader: (1)
Join Date: Dec 2014
Location: Dover, DE
Posts: 112
Likes: 0
Received 4 Likes
on
3 Posts
Car: 1990 & 1991 Firebird Formula 350's
Engine: 350 ci
Transmission: T 5 & 700r4
Axle/Gears: 3:23 & 3:27
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
I don't know who you heard that from but mine works perfectly
Trending Topics
#8
Junior Member
Join Date: Jul 2010
Location: RI
Posts: 18
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1992 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 2.73 (stock)
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
I might need that VSS... I have a 86 TA t5 I'm putting in a 92 bird and I think they changed the pulse rate from 86 to 92. (Even '86 were electronic in the Firebirds).
#10
Member
iTrader: (1)
Join Date: Dec 2014
Location: Dover, DE
Posts: 112
Likes: 0
Received 4 Likes
on
3 Posts
Car: 1990 & 1991 Firebird Formula 350's
Engine: 350 ci
Transmission: T 5 & 700r4
Axle/Gears: 3:23 & 3:27
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
#11
Member
iTrader: (1)
Join Date: Dec 2014
Location: Dover, DE
Posts: 112
Likes: 0
Received 4 Likes
on
3 Posts
Car: 1990 & 1991 Firebird Formula 350's
Engine: 350 ci
Transmission: T 5 & 700r4
Axle/Gears: 3:23 & 3:27
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
I have the correct pulse rate converter for you. It works with a transmission where the speedo was cable driven. Is that what you have?
#12
Moderator
iTrader: (1)
Join Date: Mar 2002
Location: Chasing Electrons
Posts: 18,401
Likes: 0
Received 215 Likes
on
201 Posts
Car: check
Engine: check
Transmission: check
Re: HELP! 700R4 mechanical speedo to T5 electric speedo conversion
RBob.