RPO CODES

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Oct 11, 2016 | 12:55 PM

gt4373

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Supreme Member

Joined: Nov 2011

Posts: 2,971

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From: CT

Car: 1984 Chevrolet Camaro Z28

Engine: 5.0 Liter 4-BBL V8 High Output

Transmission: 5-Speed Manual

Axle/Gears: 3.73

RPO CODES

Anyone Know Why GM Used 2 Different RPO Codes For The 5-Speed Manual Trans. It's Shown On Both SPID's And Build Sheets.

Oct 11, 2016 | 05:43 PM

PurelyPMD

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Joined: Jan 2013

Posts: 3,038

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From: Newtown, CT

Car: 1987 IROC Original Owner

Engine: LB9

Transmission: M39 MM5

Axle/Gears: G80 G92 J65

Re: RPO CODES

One was for all of the associated parts and the other was for the actual trans.

MK6 would be the World Class T5
M39 would be the regular T5

Oct 13, 2016 | 02:43 PM

tavert91

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Joined: Jan 2008

Posts: 618

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From: Destin, Florida

Car: 91 Trans Am Convertible

Engine: LB9 5.0 TPI

Transmission: 5 SPD

Axle/Gears: Posi Rear

Re: RPO CODES

MM5 = 5 Speed parts provisions (console parts, etc)
M39 = Transmission Body with 3.08 Final Drive Ratio
MK6 = Transmission Body with 3.42 Final Drive Ratio

Both available with LB9, 5 Liter engine but the MK6 was used in the dual exhaust, higher HP version (230HP with 300 lb-ft torque vs. 205HP with 285 lb-ft torque).