Transmission problems


Asked by Aug 02, 2015 at 08:23 PM about the 2002 GMC Sierra 2500 4 Dr SL 4WD Extended Cab SB

Question type: Maintenance & Repair

I have a 2002 GMC Sierra 2500 and
before i bought it from a buddy he
drove it through a very large puddle
and it cracked his block. So we
replaced the engine and then the
tranny started giving him problems. It
would jump every time it shifted until
it finally just wouldnt drive or go into
reverse. So we replaced the Torque
converter and transmission with
another one, which was fried so he
sold the truck to me because he was
done with it. The new tranny won't go
into drive or reverse, only works in 3rd.
Ive heard plenty of reasons why, such
as the fluid pump is bad, the filter is
clogged, gears are shot and whole
transmission is done. I have two,
4L80E transmissions with the same
problem, buy a new one or is there
something i can do to save me $?

3 Answers


I'd suspect an electrical problem since this all started with the big (wet) puddle. Water can wreak havoc on the electrical system of a vehicle. Is the check engine light on? If so, what trouble codes do you have? A tranny problem can trigger the check engine light and set a trouble code. Make sure all the electrical connections having to do with the transmission are clean and tight. Check for damaged or disconnected wiring as well. HTH. -Jim


The transmission that was on the truck when it went in was replaced with what we thought was a good one. Right now the one that is on the truck isnt shifting into D or R only third.

1 people found this helpful.

Ok update on transmission. Wont engage drive or reverse but 1-3 gear works and when you get it up to ~50mph it works in D

2 people found this helpful.

Your Answer

Sierra 2500

Looking for a Used Sierra 2500 in your area?

CarGurus has 156 nationwide Sierra 2500 listings starting at $4,800.


GMC Sierra 2500 Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used GMC Sierra 1500
716 Great Deals out of 59,021 listings starting at $1,995
Used GMC Sierra 2500HD
134 Great Deals out of 15,673 listings starting at $4,395
Used Chevrolet Silverado 2500
203 listings starting at $4,495
Used Chevrolet Silverado 2500HD
370 Great Deals out of 29,642 listings starting at $2,000
Used Chevrolet Silverado 1500
1,778 Great Deals out of 149,895 listings starting at $828
Used Ford F-250 Super Duty
370 Great Deals out of 41,860 listings starting at $1,600
Used Dodge Ram 2500
139 Great Deals out of 4,933 listings starting at $2,495
Used Ford F-150
2,294 Great Deals out of 215,605 listings starting at $1,300
Used Toyota Tundra
483 Great Deals out of 38,910 listings starting at $1,999
Used GMC Sierra 3500
226 listings starting at $7,988
Used Chevrolet Silverado 1500HD
3 Great Deals out of 228 listings starting at $3,850
Used Dodge Ram 1500
308 Great Deals out of 9,553 listings starting at $1,750

Used Cars For Sale

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.