swap th350 to a th700r4
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 6
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From: EU-Holland
Car: 82 Firebird and 80 Firebird
Engine: 305 chevrolet and Pontiac 400
swap th350 to a th700r4
Hello,
First of all sorry fore the bad writing, English is not my mother languish
My problem,
I have a 82 firebird, and get a donor car fore the engine it’s a 87 firebird.
I swab the engine and trans.
The trans was a TH350 and the trans I put in, is a th700r4.
Now the Speedo of the 350 is whit a cable and the 700 is electrical.
What is the best way to get the speedo meter working again.???
What option’s do I have…. Build the inside wiring and dash from the 87 in to the 82 firebird?
Thanks.
First of all sorry fore the bad writing, English is not my mother languish
My problem,
I have a 82 firebird, and get a donor car fore the engine it’s a 87 firebird.
I swab the engine and trans.
The trans was a TH350 and the trans I put in, is a th700r4.
Now the Speedo of the 350 is whit a cable and the 700 is electrical.
What is the best way to get the speedo meter working again.???
What option’s do I have…. Build the inside wiring and dash from the 87 in to the 82 firebird?
Thanks.
Supreme Member




Joined: Jan 2009
Posts: 2,313
Likes: 115
From: belle fourche,s.d.
Car: '82 z28
Engine: L83 5.7
Transmission: 700r4-1985
Axle/Gears: 3.42 posi
Re: swap th350 to a th700r4
just use a cable type speedo drive in place of the electric
sender on the '87 tranny-camaro is cable drive up
through '89,i think '86 firebird is still cable drive too.
sender on the '87 tranny-camaro is cable drive up
through '89,i think '86 firebird is still cable drive too.
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 6
Likes: 0
From: EU-Holland
Car: 82 Firebird and 80 Firebird
Engine: 305 chevrolet and Pontiac 400
Re: swap th350 to a th700r4
you mean put the cable from the 82 firebird in the tranny of the 87 firebird?
but here is no connection in the tail of the tranny fore cable drive speedo!
but here is no connection in the tail of the tranny fore cable drive speedo!
Senior Member
Joined: Sep 2007
Posts: 568
Likes: 1
From: Leander,TX
Car: 84 Z28 / 88 Trans Am / 87 base
Engine: L69 H.O. / 468 BBC / 2.8 v6
Transmission: 89 700R4 / TH375B / 700R4
Axle/Gears: 3.73 open / 3.23 posi / 3.42 open
Re: swap th350 to a th700r4
No just remove the electical sensor in the tail from the 87, then install a mechanical sender for your cable. usually a junk yard find for low cost.
Supreme Member
Joined: Feb 2010
Posts: 1,446
Likes: 2
From: Orlando
Car: 1991 Camaro Z28
Engine: 357, Canfield heads, solid roller,
Transmission: Upgraded 03 Cobra T56
Axle/Gears: 9" 3.50 gears and Detroit Locker
Re: swap th350 to a th700r4
The only other way I know of is a box like this one. It takes the signal in and then spins the cable for your speedometer. Not cheap though.
http://www.thegearbox.org/catalog/it...17/7084167.htm
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 6
Likes: 0
From: EU-Holland
Car: 82 Firebird and 80 Firebird
Engine: 305 chevrolet and Pontiac 400
Re: swap th350 to a th700r4
Find a tail of a th700 whit a cable drive connection, this is Europe… we only have vw and other European cars.. On the junk yard…To bad. If I find one it still will be expansive it think.
And that box is a bit expansive..300 dollar when I have it fly over to Holland it will be 350/400 euro..
Is my option to switch the wiring from the 87 to the 82 not a option? I know it’s a lot of work, but I have the donor car!
And that box is a bit expansive..300 dollar when I have it fly over to Holland it will be 350/400 euro..
Is my option to switch the wiring from the 87 to the 82 not a option? I know it’s a lot of work, but I have the donor car!
Senior Member
Joined: Sep 2007
Posts: 568
Likes: 1
From: Leander,TX
Car: 84 Z28 / 88 Trans Am / 87 base
Engine: L69 H.O. / 468 BBC / 2.8 v6
Transmission: 89 700R4 / TH375B / 700R4
Axle/Gears: 3.73 open / 3.23 posi / 3.42 open
Re: swap th350 to a th700r4
I forgot to mention that shaft ring. Are you keeping the engine carburated our using the 87's EFI? if you use the EFI with the 87 computer and guage assembly It will all work, If carbed then you will need that box.
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Thread Starter
Junior Member
Joined: Mar 2010
Posts: 6
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From: EU-Holland
Car: 82 Firebird and 80 Firebird
Engine: 305 chevrolet and Pontiac 400
Re: swap th350 to a th700r4
The engine I dropt out of the 82 was a injection but built to carb.
The engine I put in from the 87 is a carbed. This was original.
I toke the engine and the tranny so I can use the wiring also? That was my thought !
Just build the whole wiring and dash unit over to the 82…
The engine I put in from the 87 is a carbed. This was original.
I toke the engine and the tranny so I can use the wiring also? That was my thought !
Just build the whole wiring and dash unit over to the 82…
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 6
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From: EU-Holland
Car: 82 Firebird and 80 Firebird
Engine: 305 chevrolet and Pontiac 400
Re: swap th350 to a th700r4
Hey...
no reply yet!!
i start whit take the wiring out of the 87 firebird.
hoping that it wil work in the 82 one.
i will reply when t works.
no reply yet!!
i start whit take the wiring out of the 87 firebird.
hoping that it wil work in the 82 one.
i will reply when t works.
Thread Starter
Junior Member
Joined: Mar 2010
Posts: 6
Likes: 0
From: EU-Holland
Car: 82 Firebird and 80 Firebird
Engine: 305 chevrolet and Pontiac 400
Re: swap th350 to a th700r4
Hello,
I finished the swap.
It was not simple.
have still some work to do, but the speedo is working now.
just let u know.
I finished the swap.
It was not simple.
have still some work to do, but the speedo is working now.
just let u know.
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