Question about 1999 GMC Suburban

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Transmission I have a truck that just does not want to get right. I have replaced the transmission twice in the last 24 months and still it hits when it shifts from 1st to 2nd. This is what happend shortly after i had it replaced the first time and now again. What can this be? The transmission only hits from 1st to 2nd and only after it has been driven about 20 miles or so.

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This is a possibilty. When the gear lube in the differential warms up and thins down alittle, there may be enough "Slop" or wear in the gears so when it shifts, it feels like a "Bang". Something like if you were driving a manual trans vehicle and you "Pop" the clutch. Have the ring and pinion gears check for excessive wear.
Another thing to look for are bad "U" joints. They can fool ya and give you false noises and vibrations.
Good Luck

Posted on Mar 04, 2009

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2 Answers

How often should I change the Transmission fluid, normal driving ? Thank you Gary


It's listed in your owner's manual. Schedule A is normal driving conditions.
SCHEDULE "A"
7,500 miles (12 000km) or at 6 months
- Change engine oil.
- Replace engine oil filter.

15,000 miles (24 000km) or at 12 months
- Change engine oil.
- Replace engine oil filter.

22,500 miles (36 000km) or at 18 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.

30,000 miles (48 000km) or at 24 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace spark plugs.
- Drain and refill automatic transmission fluid and filter (4.7L).

37,500 miles (60 000km) or at 30 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Drain and refill transfer case fluid.

45,000 miles (72 000km) or at 36 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.
- Flush and replace engine coolant at 36 months, regardless of mileage.

52,500 miles (84 000km) or at 42 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if not done at 46 months.

60,000 miles (96 000km) or at 48 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace ignition cables (5.2L/5.9L).
- Inspect PCV valve, replace as necessary.
- Replace spark plugs.
- Inspect auto tension drive belt and replace as necessary (5.2L/5.9L).
- Drain and refill automatic transmission fluid (4.7L).

67,500 miles (108 000km) or at 54 months
- Change engine oil.
- Replace engine oil filter.
- Inspect front wheel bearings.
- Inspect brake linings.

75,000 miles (120 000km) or at 60 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Drain and refill transfer case.
- Flush and replace engine coolant if it has been 30,000miles (48 000km) or 24 months since last change.
- Inspect auto tension drive belt and replace if required.

82,500 miles (132 000km) or at 66 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if it has been 30,000miles (48 000km) or 24 months since last change.

90,000 miles (144 000km) or at 72 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace spark plugs.
- Inspect front wheel bearings.
- Inspect brake linings.
- Inspect auto tension drive belt and replace as necessary.
- Drain and refill automatic transmission fluid (4.7L).

97,500 miles (156 000km) or at 78 months
- Change engine oil.
- Replace engine oil filter.

105,000 miles (168 000km) or at 84 months
- Change engine oil.
- Replace engine oil filter.
- Flush and replace engine coolant if it has been 30,000 miles (48 000km) or 24 months since last change.
- Inspect auto tension drive belt and replace if required.

112,500 miles (181 000km) or at 90 months
- Change engine oil.
- Replace engine oil filter.
- Drain and refill automatic transmission fluid and filter (5.2L/5.9L).
- Inspect front wheel bearings.
- Inspect brake linings.
- Flush and replace engine coolant if it has been 30,000 miles (48 000km) or 24 months since last change.

120,000 miles (192 000km) or at 96 months
- Change engine oil.
- Replace engine oil filter.
- Replace engine air cleaner filter.
- Replace ignition cables (5.2L/5.9L).
- Inspect PCV valve, replace as necessary.
- Replace spark plugs.
- Inspect auto tension drive belt and replace as necessary.
- Drain and refill automatic transmission fluid (4.7L).

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Sep 05, 2010 | 2001 Dodge Durango

5 Answers

Transmission shifting very hard


Unfortunatly my transmission does the same thing. I had it repaired for about $800 only to have the same thinig happen again about 4 months down the road. It seems that there are alot of horror stories about these saturn transmissions. My trans has been slamming for about 3 years now and it still works...per say. Id say either replace it or just drive it until it breaks.

Jul 27, 2010 | 2002 Saturn Sl

1 Answer

How do i disconnect the ets the trac light comes on and makes the transmision shift reel hard. it is a intermiting problem


your problem is your serpintine belt. trust me when was the last time you replaced that? they are under $25 at auto zone and take a 10mm wrench and five minutes to do. its a recommended evey six months change. even if the tentioner pulley marks are in limits, still replace it after about 5 miles of driving the light will extingush and transmission will shift right

Jan 06, 2010 | 2000 Oldsmobile Alero

2 Answers

2002 Toyota Celica with a strange shifting problem.


I had the same problem, replacing you thermostat should do the trick, i spent 8.99 on a new thermostat and 99 cents on a seal. For some reason engine temperature affects the transmission shifting. Good luck

May 31, 2009 | 2002 Toyota Celica

1 Answer

Automatic transmission doesn't shift into gear right away, there is a long lag before it engages


Hello There

Sounds like your transmission oil needs to be changed, when was it last changed?


Hope this helps, please don't forget to rate me.

May 20, 2009 | 1983 Ford F 250

1 Answer

96 Cavalier battery light


check charging system,check elect,conn.at alt.or alt.itself.

Apr 03, 2009 | 1996 Chevrolet Cavalier

1 Answer

I have a '91 deville with 70k. The digital speedometer fluxuates sometimes goes to 0mph. The transmission shifting follows the speedometer. My local mechanic replaced the vss twice. First time it lasted 1...


I don't believe the problem is in the vehicle speed sensor. I suspect the problem may be the computer. The speed sensor is just a magnet inside the transmission with an induction coil outside to create an electrical signal every time the transmission output shaft turns. That signal goes to the computer and the computer tells the transmission when and how to shift and displays the speed on your electronic display. I would start by having a reputable transmission shop check out the transmission, then take it to a good mechanic to have him check the computer. It is a relatively expensive fix, but with only 70,000 miles on the Caddy, it should be worth it.

Feb 22, 2009 | 1991 Cadillac DeVille

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