For what it is worth our friends over at Milzy Motorsports are looking for a guinea pig to transplant a 6 speed manual in a '99-'05 GA. Check it out.
Click here
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Originally Posted by Jrs3800
1999+ you could have had the 2.2( later years ), 2.4 or 3400... and iirc they all were attached to the 4T45-E
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Tbe 2.2L Ecotec came out in the 2002 model year. Starting in 2000 Pontiac offered the 5 speed manual Getrag M86/M94 for GA models with the 2.4L engine and continued to do so into later years. Same is applicable to the sister N Body Alero. Of course, 3400 V6 equipped GAs were autotransaxle only. There are two arguably different autotransaxles supplied. The 4T40E, GM RPO code MN4 and 4T45E, GM RPO code MN5. MN4 rated to handle up to 200 lb-ft torque and MN5 215 lb-ft. Otherwise very similar and both are pressure control solenoid (PCS) equipped to control line pressure. At least up to the 2002 model year the MN4 is found in GAs equipped with the 2.4L and 2.2L engines. The MN5 variation in all 3400 V6 equipped units.
When in doubt just check the SPID label affixed to the back of the spare tire cover and look for the RPO code.
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Originally Posted by Jrs3800
Sad that GM attached a 3400 to a 4T45-E
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Other than no dipstick to easily check ATF level.... Why? The 4T45E, MN5 is rated for GM compact/sub-compact vehicles up to GVW 4100 lbs and very conservatively rated to handle up to 215 lb-ft of torque. Works fine with modded 3400 engines even into the mid-high 13s. No issues that I know of with a modded '02 Olds Alero GL2 or modded '00 GA GT. IMO more reliable than the 4T65E autotransaxle.