Results 1 to 10 of 12
Thread: 99 Sierra 1500 shifting problem
01-09-2009, 03:28 PM #1
99 Sierra 1500 shifting problem
I'm new to the forum but have been a long time GMC truck owner.
My 1999 Sierra 1500 4 X 4 SLT Z71 with 135,000 miles on it doesn't want to shift gears when the temerature drops below freezing.
It will stay in 2nd for about a mile then shift t 3rd. After another couple of miles it will then shift to 4th and, again, after another mile or so shift into overdrive. After this it will then shift fine.
I've recently had the ATF drained and refilled with Dexron 3.
I'm hoping somebody can help me fix this minor issue as, apart from this problem, the [COLOR=blue! important][COLOR=blue! important]truck[/COLOR][/COLOR] looks and run great.
01-09-2009, 05:41 PM #2
Welcome to the site!
Hopeully the "tranny" guys will chime in on this.Ryan
2002 Jeep Wrangler Sport 4x4 (the Yellow Jacket)
4inch suspension 3inch body
Straight 6 (383 Stroker within a year)
36inch SuperSwamper TSL.
Daily Driver Weekend Wheeler
2004 Sierra crew cab, 2wd, 5.3 V8
2inch Daystar Leveling kit
single dumped Flowmaster 40 sieries exaust(removed)
Mb Blitz Chrome wheels
Leer Bed Cover(for sale)
01-09-2009, 06:25 PM #3
Can you try putting the truck through the gears manually i.e. 1 , 2, 3, Drive with OD off? Or what ever you cn. But that is one weird problem, I've never heard of it.Trevor - Huntington Beach, CA
2007 GMC 2500 4X4
01-12-2009, 12:33 PM #4
- Join Date
- Jan 2009
try a tps sensor
01-12-2009, 01:16 PM #5
Hi and thanks for the suggestion. What is a "TPS" sensor?
01-12-2009, 02:19 PM #6
TPS, throttle position sensor.Don't replace it thats not the problem, I think he meant to say speed sensor. Could possibly be the speed sensor but this on is difficult to diagnose.
01-12-2009, 03:38 PM #7
Thanks RETIRED. I'll check with the local GMC dealer (if he's still in business!!!) for a spped sensor but I still can't figure out why it would be temerature sensitive. Still, it's worth a shot.
Any more ideas?
01-12-2009, 02:15 PM #8
Thanks for the suggestion. I have done that and it shifts into first no problem and second no problem but when you selct 3 or 4, if the temerature is below freezing, it will hang up in second gear. After a couple of miles it will then go into third gear and, agter another couple of miles, it will go into fourth.
When the temerature is ABOVE freezing it shifts through all gears real smooth with no problems at all. Weird huh?
By Bobby1021 in forum GM PowertrainReplies: 4Last Post: 07-24-2010, 10:09 PM
By 90silverado90 in forum GM PowertrainReplies: 4Last Post: 04-21-2009, 05:23 PM
By Papi325i in forum Chevy Silverado Forum (GMC Sierra)Replies: 9Last Post: 03-22-2009, 07:31 PM
By dmbaero in forum Chevy Silverado Forum (GMC Sierra)Replies: 0Last Post: 01-18-2008, 03:10 PM
By udderchaos in forum Chevy Suburban Forum (GMC Yukon XL)Replies: 8Last Post: 09-23-2006, 12:00 AM