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

MM5 vs MXO

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Old 07-25-2012, 07:50 AM
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Car: 1991 Pontiac Firebird Trans Am
Engine: 1987 Chevy 355 TPI Mild Cam
Transmission: 5-Speed T-5 WC
Axle/Gears: 3.42
MM5 vs MXO

Ok so im trying to figure out what these mean and what the difference is, its RPO codes for transmissions but i have no idea what they mean.

Also I have a 1991 Pontiac Firebird Trans Am GTA, what one do I have? Thanks
Old 07-25-2012, 08:10 AM
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Car: 1986 z28
Engine: 350 hsr
Transmission: probuilt 700r4/edge 2800
Axle/Gears: stock 4th gen 3.23
Re: MM5 vs MXO

Not sure what mm5 means but i know that mxo is for the 700r4 in the in the 350 cars
Old 07-25-2012, 01:01 PM
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Car: 91 Firebird,00 c2500,75 Vette
Engine: 3.1 but 350 soon, 350, 350
Transmission: T56 soon
Axle/Gears: stock 3.42 Posi to come
Re: MM5 vs MXO

mm5 should be for a 5 speed.
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