I will be changing my rear end gearing from 2.77 to 3.42 here soon and was wondering what I should expect to pay for a speedo gear cable so my speedo isn't off.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

 

The cable is the same, you're changing the speedo gears in the tailshaft of your 700R4 trans. I think they're less than $20 each from GM. You need a 15 tooth and a 41 tooth for 3.42 gears in a 700R4, *I think*

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

[This message has been edited by Kevin91Z (edited February 06, 2001).]

 

I concur. Those are the gears listed in the GM parts manual for that combination of tranny, rear gears, and tires (assuming you have 245/50R16 tires). I also bought either the 40-tooth or 42-tooth gear for my shorter (245/45R16) road-race tires since it's only an easy 10-minute job to swap that gear out. The other gear is quite a bit more difficult, which is why I had my shop do it when they rebuilt the rear end.

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Greg Westphal
'87 IROC 305TPI/A4