Asked by Jun 02, 2016 at 06:02 PM about the 2005 Pontiac Grand Am

Question type: Maintenance & Repair

I bought an 02 grand am to fix my 05. They are
both 3400 engines. We swapped the transmission
from the 02 put it in the 05 and it has a hard shift
and throwing an incorrect gear ratio code. We don't
know what we should do from here. I'm almost
98% sure it's a computer issue bc it runs
beautifully when you first start and get going but
once it gets to running temp it starts shifting hard.
The transmission shifted perfectly before we took
it out of the 02. Any advice?

3 Answers


Yes, your right the '05 doesn't like the vintage '02 transmission and its possible the ratio is different check that first..once its warmed up and in closed loop the computer is controlling the shifting on the old '02 transmission. Mix and match parts don't function well without the proper checking and design work. Ratio check first step.


How do I do a ratio check?

1 of 1 people found this helpful.

Well I got an 05 transmission.. hopefully all we have to do is swap and be done

Your Answer

Grand Am

Looking for a Used Grand Am in your area?

CarGurus has 752 nationwide Grand Am listings and the tools to find you a great deal.


Pontiac Grand Am Experts

  • #1
  • #2
    John Saffrahn
  • #2
    Tom Demyan
View All

Related Models For Sale

Used Pontiac Grand Prix
1,880 listings starting at $3,000
Used Ford Mustang
288 Great Deals out of 38,306 listings starting at $1,995
Used Pontiac G6
26 Great Deals out of 2,858 listings starting at $699
Used Chevrolet Malibu
604 Great Deals out of 48,316 listings starting at $1,800
Used Chevrolet Impala
375 Great Deals out of 27,000 listings starting at $1,000
Used Dodge Charger
259 Great Deals out of 32,995 listings starting at $495
Used Pontiac GTO
4 Great Deals out of 369 listings starting at $3,950
Used Pontiac Bonneville
336 listings starting at $995
Used Chevrolet Corvette
88 Great Deals out of 15,662 listings starting at $4,500
Used Nissan Altima
748 Great Deals out of 67,282 listings starting at $750
Used Honda Accord
529 Great Deals out of 93,656 listings starting at $1,495

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.