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Transmissions and Drivetrain Need help with your trans? Problems with your axle?

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Old 05-17-2007, 10:25 PM   #1
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Join Date: Jul 1999
Location: BEL AIR, MD
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Car: '89 Formula 350, '92 T/A Vert
Engine: 5.7L L98 TPI, 5.0L LB9 TPI
Transmission: 700-R4 Automatics
Axle/Gears: 7.5 disc posi 3.23, 7.5 drum 2.73

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700R4 to 350 swap. NEED A SPEEDO ADAPTER?

I am looking to swap a TH350 in place of the 700 R4. I need a way to get the electric speedo to work. An ideas??
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Old 05-17-2007, 11:27 PM   #2
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Join Date: Jan 2002
Location: Orland Park, IL
Posts: 12,950
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11

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Re: 700R4 to 350 swap. NEED A SPEEDO ADAPTER?

adapter from trans shop or summit/jegs etc
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Old 05-18-2007, 10:32 PM   #3
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Join Date: Jul 1999
Location: BEL AIR, MD
Posts: 746
Car: '89 Formula 350, '92 T/A Vert
Engine: 5.7L L98 TPI, 5.0L LB9 TPI
Transmission: 700-R4 Automatics
Axle/Gears: 7.5 disc posi 3.23, 7.5 drum 2.73

Classifieds Rating: (2)
Re: 700R4 to 350 swap. NEED A SPEEDO ADAPTER?

What does the adapter consist of? Is it just to adapt to a different hole size or a signal generator specific to the 350s housing?
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Old 05-20-2007, 05:49 PM   #4
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Re: 700R4 to 350 swap. NEED A SPEEDO ADAPTER?

Here you go. This kit allows you to put your 700r4 tailshaft with its electric speedo on the th350 transmission
http://www.transmissionpartsusa.com/...-00000735b.htm
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Old 03-30-2008, 11:41 PM   #5
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Location: Charlotte, NC
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Car: 1989 Camaro RS
Engine: 355 mildly modified
Transmission: 700R4 fully modified

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Re: 700R4 to 350 swap. NEED A SPEEDO ADAPTER?

Anything that was need to know for doing this? What problems did you run into? How difficult was it to hook up the shift linkage, speedo, and what type of driveshaft issues did you have? I've blown out my 2nd 700r4 and am ready to put in something different.

Thanks,
Mike
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Old 03-30-2008, 11:41 PM
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