Waht is worng with shifting

Asked by Apr 08, 2011 at 12:16 PM about the 1994 GMC Sierra 1500 K1500 SL 4WD Extended Cab SB

Question type: Maintenance & Repair

I have a 1994 GMC sierra 1500 with a 5.7 motor. I am having a prolem with down shifting. I get goin about 60 mph and the speedo does not go any higher. It also starts to down shift and shifts back up it just jumps from 3rd to 4th. When this starts to happen the speedo goes down about 10 mph and start to jump around. I had a trans shop test it and it said it does not have any faults. They said it seam to be elctrical. The computer show the speed jumping between 30 and 60 but the speedo said it was 60mph. Does anyone have any idea what this could be before they start palying with. I do not want to have them to start to replace parts untill they figure it out.

Thank you in advance
Tom

1 Answer

i have the same truck and problem but it happens when i hit 70. It was a forest service rig and i believe there is a governer on mine. are you sure yours is actually going 60 or could the gears be set at a different ratio so your actually going faster may be your going 70 when it reads 60 and you have a governer. just a thought.

Your Answer

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,450
  • #2
    John Saffrahn
    Reputation
    3,780
  • #3
    Glenn Clingenpeel
    Reputation
    3,470
View All

Related Models For Sale

Used Ford F-150
3,279 Great Deals out of 221,661 listings starting at $1,200
Used Dodge Ram 1500
432 Great Deals out of 11,121 listings starting at $1,495
Used Toyota Tacoma
706 Great Deals out of 45,625 listings starting at $1,000
Used Chevrolet Tahoe
787 Great Deals out of 41,984 listings starting at $1,987
Used GMC Yukon
598 Great Deals out of 20,736 listings starting at $2,500
Used Chevrolet Camaro
458 Great Deals out of 31,600 listings starting at $1,450

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
26,024 listings starting at $23,419
2017 GMC Sierra 1500 For Sale
86 Great Deals out of 11,058 listings starting at $20,369
2016 GMC Sierra 1500 For Sale
169 Great Deals out of 4,085 listings starting at $16,404
2015 GMC Sierra 1500 For Sale
189 Great Deals out of 5,611 listings starting at $14,995
2014 GMC Sierra 1500 For Sale
211 Great Deals out of 4,939 listings starting at $9,900

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.