tranny shifts funny when raining

brokenbudget · 11-14-2007, 05:28 PM

hey guys (and gals) new to the forum.
i have a 95 gmc 1500 , 4.3 auto o.d.. the truck has 430 000 km's and this past summer the tranny started to shift hard/late or stumble when the temp outside is cool or it's damp-it's worse if it's raining. no codes come up, the fluid/filter has always been maintained. the oil is new now and it was perfectly fine before as is the filter. i'm leary of bringing the truck to a tranny shop (they always say you need a new tranny

). the truck has never been worked on except for regular service. there is no slipping, noise and it works perfectly fine on nice sunny or warm days.-heh, no i can't drive only on those days. i'm stumped. any help would be great!

brokenbudget · 11-19-2007, 10:08 AM

so nobody has any idea what might be causing this

mrjohnwayne · 11-19-2007, 02:33 PM

could be a loose plug on the tranny wiring that is letting moisture in.

brokenbudget · 11-23-2007, 08:47 AM

well it seems to be fixed now (changed out the speed sensor). it's funny, you would think this would set off the check engine light or come up as a code when we had it hooked up at a buddies shop (??). ended up some guy that was there had the same problem with his truck (his engine light came on and there was a few codes), same problem and symptoms. oh well, fixed.

mrjohnwayne · 11-24-2007, 05:53 PM

Good to know. sorry we couldnt be of more help.

11-14-2007, 05:28 PM	#1
brokenbudget Full Member Join Date: Nov 2007 Posts: 22	tranny shifts funny when raining hey guys (and gals) new to the forum. i have a 95 gmc 1500 , 4.3 auto o.d.. the truck has 430 000 km's and this past summer the tranny started to shift hard/late or stumble when the temp outside is cool or it's damp-it's worse if it's raining. no codes come up, the fluid/filter has always been maintained. the oil is new now and it was perfectly fine before as is the filter. i'm leary of bringing the truck to a tranny shop (they always say you need a new tranny). the truck has never been worked on except for regular service. there is no slipping, noise and it works perfectly fine on nice sunny or warm days.-heh, no i can't drive only on those days. i'm stumped. any help would be great!

11-19-2007, 02:33 PM	#3
mrjohnwayne Senior Moderator Join Date: Apr 2005 Location: Texas Posts: 3,722	could be a loose plug on the tranny wiring that is letting moisture in. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

11-24-2007, 05:53 PM	#5
mrjohnwayne Senior Moderator Join Date: Apr 2005 Location: Texas Posts: 3,722	Good to know. sorry we couldnt be of more help. __________________ John Wayne 2000 F-350 7.3L Powerstroke 4x4

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11-19-2007, 10:08 AM	#2
brokenbudget Full Member Join Date: Nov 2007 Posts: 22	so nobody has any idea what might be causing this

11-23-2007, 08:47 AM	#4
brokenbudget Full Member Join Date: Nov 2007 Posts: 22	well it seems to be fixed now (changed out the speed sensor). it's funny, you would think this would set off the check engine light or come up as a code when we had it hooked up at a buddies shop (??). ended up some guy that was there had the same problem with his truck (his engine light came on and there was a few codes), same problem and symptoms. oh well, fixed.