Gmc 1998 sierra c1500: engine light on, blinks when excellerating, after it warms up transmission only has 2-3 gears (manually shift down at stop). Instruments seem to be fine and working. Battery needs to be replaced as is very old. the code I get refferences the shift selenoid. 3-2 downsift is what I read on line.

SOURCE: 1998 GMC Sierra Signal Fuse Blowing

it seems you have a short in either one of the lights or interlock. all are connected to the same fuse. trace the wiring from the fuse box back to the component. Using a test light test in between the wires. check for any obvious breaks in the wiring.

SOURCE: removal of power steering pump on 1998 GMC Sierra 1500

you need a power steering pump puller the rest is simple any trouble let me know

SOURCE: 1998 gmc sierra slow shifting when cold acts

have the transmission fluid and filter changed

SOURCE: slow shifting when engine is cold

I have the same problem with my 97.... especially shifting from 3rd to O/D... I've had the tranny serviced and flushed.... It still does it until the tranny warms up.... the tranny's in them are temperature picky!!!!! It's the nature of the beast!!! Wait until spring and everything will be good until next winter!!! If you're really concerned with it you can put a "cold front" on it or block half (NO MORE THAN HALF) of the tranny cooler with cardboard thru the winter months

Dennis Mulford

• 1055 Answers
• Posted on Apr 20, 2009

SOURCE: 1998 GMC Sierra (C1500) 5.0L 305 V8-right rear brake line

i dont know of any recall for that
and yes it can be replaced without removing the bedeasy wasy too do it is go too auto zone and buy a roll of brake line and run it along side of the old one and just leave the old one in the hangers and use tie straps too hang the new one!!!