I think I'm going to get my butt in gear and put the 3.42's I have on my car. Now I know I have to recalibrate my speedo. I've seen several products that do this, but what is your advice? What should I do? Is there somewhere you recommend or a certain product? Thanks a bunch

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1992 Camaro RS (Auto)
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Performance mods
NOS (125 HP shot)
Dynomax cat-back exhaust
Hedman headers
K & N open element/ X-Stream lid
MSD 6A ignition
Under drive pulleys
LT1 camshaft
Now ordered:
Edelbrock intake manifold
3.42 posi
B & M 2400 RPM stall torque converter
Transgo shift kit
Moroso Blue Max plug wires
305 TPI heads

Audio
Sony Xplod CDX-M610 head unit
Pioneer 2-way 4x6 front speakers
Pioneer 3-way 6x9 rear speakers
12 inch Pioneer VCCS PRO subwoofer
QLogic sealed box
Kicker ZR360 amplifier
Lightning Audio 1 farad capacitor
Other
Macewen White Faced Gauges/Shift overlay
A-pillar gauges (Phantom oil pressure, Air/Fuel)
180* thermostat
Window Tint

 

ive been wondering about this too, i have a electric speedo if that matters...

 

You're gonna have to change the little plastic gears and speed sensor in the back of the transmission. There's a tech article on how to do it here on thirdgen. But I don't know what the part numbers for the gears and speed sensor are for 3.42, only 3.73. Maybe someone else around here knows...

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Michelle
92 Formula 350
91 Z28

 

For 3.42 gears with a 700R4 and 245-50-16 tires, the gears are:

Drive: 15 tooth gray, PN 8642620
Driven: 41 tooth yellow, PN 25513048

 

Yeah, but whats the deal on the sensor. Does it also have to be changed? I'm also getting ready to replace my 2.73's for a 3.42 Zexel take off. I've searched the old post and have been left confused on the subject. My 86 Trans Am has the two wires coming out of the tail housing instead of a cable so I'm guessing its electronic with a sensor. And yes I've already got my 28 spline axles.

 

btt