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Transmission hard shifting from first to second

Tiny
JASMINA ZAMETICA - TORLAKOVIC
  • MEMBER
  • 1994 GMC SUBURBAN
  • 7.4L
  • V8
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
I have a 2500. It has been shifting hard from first to second. My husband (he's been a mechanic for about five years but does not have much experience on older cars) believes that the shift solenoid could be the culprit. (Funny thing is that it shifts much smoothly when its pulling a load) I was wondering if there was any open recalls on my transmission from that year. I have a 4L80E transmission. Any information or advice would be greatly appreciated thanks.
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Saturday, February 16th, 2019 AT 8:41 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
There is no recall on the transmission for this problem. can I ask if you have a tow package sector switch? I would start with a transmission service. here is a guide to help walk you through the repair:

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Also lets run the codes to see what comes up.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Please run down these guides and report back.

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Monday, February 18th, 2019 AT 11:26 AM

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