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89 GMC M20 Trans Shifter Jams
My church has a 89 GMC truck for plowing the lot, and it keeps jamming the shifter. This is a 4 speed manual, with the granny gear first gear. The RPO code is M20. The only information I found on that is for older cars with the external linkage. This has the s... Login to read more. 
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| Engine | 5.7 L |
| Trans | 4-speed Standard |
Vehicle Data
1989 GMC K2500 Sierra 5.7L
| Engine | 5.7 L |
| Trans | 4-speed Standard |
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