C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

ZF6 Speedo gear part#??

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Old Apr 29, 2006 | 07:31 PM
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Default ZF6 Speedo gear part#??

I am putting a ZF6 in an 84 with 307 ratio rear end.. would someone happen to have the part# for the right speedo gears..one on tail shaft and its mate in the speedo drive.

Thanks...
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Old Apr 29, 2006 | 08:20 PM
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Originally Posted by We Gone
I am putting a ZF6 in an 84 with 307 ratio rear end.. would someone happen to have the part# for the right speedo gears..one on tail shaft and its mate in the speedo drive.

Thanks...
If the transmission is from a 1989 or '90, use the parts from the 1984 transmission. In 1991 they changed the diameter of the mainshaft where the drive gear fits on. They don't make a proper tooth count drive gear to fit the later shaft. If that is your case, let me know and I'll try getting creative.

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Old Apr 29, 2006 | 09:40 PM
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It is a 95 ZF6 trans...

Last edited by FASTAZU; Apr 30, 2006 at 04:30 PM.
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Old Apr 30, 2006 | 04:16 AM
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This is the exact swap I did. The ZF should have a grey gear in it, don't mess with it. You need a red driven gear, 37 teeth. Use your 84s speedo sensor and spin it upside down, use the clamp off your 84 and tweak the fingers so they hold it in.

You'll get sick of the 3.07s with that zf in no time though. Save up some cash for a new ring/pinion.


Also, while you're in there, get a 91+ backup sensor connector. It's the same p/n as the 91+ horn connector, AC delco pt1357, napa also has it. Splice it in place of your old backup sensor plug. Much cheaper this way than spending $60 on the 89-90 sensor that fits your harness.

Last edited by CentralCoaster; Apr 30, 2006 at 04:32 AM.
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Old Apr 30, 2006 | 09:44 AM
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Thanks again for the info..the more options the better...

Buy the way you guys are great..heres one for ya..
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Old Apr 30, 2006 | 06:32 PM
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Originally Posted by CentralCoaster
This is the exact swap I did. The ZF should have a grey gear in it, don't mess with it. You need a red driven gear, 37 teeth.

If the grey, 15 tooth, drive gear isn't there, the part number for 1991 and up, is 12507670. The red, 37 tooth, driven gear is a 25513044.

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Old May 1, 2006 | 07:05 AM
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Originally Posted by CFI-EFI

If the grey, 15 tooth, drive gear isn't there, the part number for 1991 and up, is 12507670. The red, 37 tooth, driven gear is a 25513044.

RACE ON!!!
Thanks, CFI-EFI This should be a nice running 84, we used a 91 long block w/ rollercam and 1.6 roller rockers & TPI fuel pump. next will come x-ram & flowed TB's & custom chip. at some point the 3.07 will go and a 3.55 will go in.
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Old May 1, 2006 | 02:58 PM
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Bring it around when you're ready.

RACE ON!!!
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