Question about Chevrolet C1500
Probably not overdrive, most likely the lock up toque converter, most likely a trany. service will cure the problem, but wile you are in the transmission changing the filter you could replace the lock up converter switch just in case it might be going bad, also when you refill the unit put a quart of transX in with the new fluid, its like miracle juice in a can, the best thing i can tell you about the switch is to buy one there not that expensive less the $30 that way when you remove the pan you will know what to look for. i guess the best way to know if its the lock up converter or overdrive is the amount of the RPM change under 400 RPM change its the converter over 400RPM then its 4th gear in either case the first action to take is the transmission service, also there is a 4th gear switch inside the pan as well. if it turns out to be 4th gear dropping out replace that switch also, if the service and switches do not cure the problem then you are looking at a new transmission.
but i am pretty confident that the service will cure it.
let me know if there is any thing else i can do for you.
Posted on Mar 14, 2011
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Posted on Jan 02, 2017
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