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Old 05-01-2013, 07:46 PM   #1
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installing 3.73

if i get rid of the stock 3.23 or whatever is stock and go with 3.73 in a 6cly 2002 firebird with a 4l60e tranny( i pretty sure thats whats in it) how much should i expect to pay for labor and do i have to re-tune the computer so it doesnt mess up the tranny
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Old 05-02-2013, 05:15 AM   #2
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Re: installing 3.73

Gears - $200
Install Kit - $80-125
Labor - $250-350

Yes, the PCM needs to be reprogrammed to correct the speedometer/odometer, and any part of the PCM program that depends on the vehicle speed sensor (VSS) input.

Does your car currently have a limited slip differential (RPO code "G80" on the build parts tag)?
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94 Formula A3+1: 381ci all-forged stroker - Callies Stealth, Oliver 5.85 billet rods, BME nitrous pistons / CNC LT4 heads / Comp Cams custom solid roller / TH400 + GearVendors OD / Strange 12-bolt - 4.11's / 300-shot N2O / Spohn suspension / 6-pt roll bar with integrated SFC's / AutoMeter instrumentation / MoTeC M48Pro engine management system / a few other odds 'n ends. 800HP/800LB-FT at the flywheel.
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Old 05-02-2013, 04:22 PM   #3
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Re: installing 3.73

id check to see what gears you have for sure. ive seen some of the V6 cars with 3.42 gears.
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Old 05-02-2013, 08:15 PM   #4
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Re: installing 3.73

no g80 on the service parts id sticker on my driver door but a y81 is that posi
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Old 05-02-2013, 08:20 PM   #5
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Re: installing 3.73

so 600-700 plus a vss bout 80$.....is it going to be worth the money as far as the upgrades are consirered or is there another option keep in mind this is a 6 cyl i got for my wife to keep her out of my 93 z28 lt1
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Old 05-03-2013, 05:21 AM   #6
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Re: installing 3.73

Stop.

Y81 is the code for a base Firebird merchandising package. Has nothing to do with a limited slip diff.

If you do not have a limited slip ("posi") differential, you will probably experience 1-wheel burnouts as soon as the extra torque from the higher numerical gears causes one wheel to break loose. The car will sit there smoking one tire, and going nowhere. Liited slip locks those wheels together to limit 1-wheel burnouts.

The best thing you can do is buy a used rear axle assembly from a 98-02 V8 model, which came standard with a limited slip carrier. Then swap the gears.
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Old 05-03-2013, 11:36 AM   #7
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Re: installing 3.73

stop, stop what i dont know what those codes mean... i think im just gonna get a tuner and be done with it. it'll be cheaper than getting new rear end and then doing gear work. its a 6cly thats why im looking for the best performance alteration for my money less than 500 total...this is my wifes car i just traded another vehicle for. she just wants to feel like she can keep up with me for a little while. i running a 93 lt1
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Old 05-03-2013, 11:36 AM
 
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