My friend has a 1973 Buick Riveria and he replaced the engine in it. He pulled the transmission with it and changed the fluid and filter and now it is slipping a little. When he changed the fluid he also drained the torque converter. He did not put any fluid back in the converter thinking it would fill itself. What could be causing the slipping?

it may have a clogged filter and that will cause the fluid level to elevate to the pointit comes out of the vent tube on the transmission housing..get the filter changed in it.

I'm not sure I am following your problem.
A transmission holds 10-15 quarts including the torque converter. When you drain the fluid you are changing about 4 quarts of the full amount.
Once you fill the transmission to the full mark on the dipstick, you should not be adding more fluid unless there is a leak. Or if the vac modulator is damaged and allowing fluid to be pulled into the engine. The fluid is checked with the engine running in park.

Simple but messy operation. Have to remove transmission pan bolts to allow old fluid to drain out. Filter will just pull out. Just notice orientation when removing. A good alternative is to go to a quick lube shop and have them do a flush. You won't have to change the filter and this way you can replace all the fluid. If you change the filter you will only be able to change 4 to 5 quarts.

When I changed the transmission oil on my 88 Buick lesabre limited I took 6 qts of Dextron VI, and it is also wise to change the transmission filter. U can purchase the transmission filter kit from any auto parts store, not neccessarily the dealer. This is the best change for the vehicle.

one thing ive warned my friends to never do and that is to never have your trans flushed cause you may have new fluids but what about the trans filter its old and iots there for that reason to keep dirt and metal; shavings from the bands so try having your oil and filter in the transmission replaced , pull your trans dip stick and on a white piece of paper put a drop of trans oil that you have in your trans at that very moment it should be redish pink but if its brown and smells really bad then the problem is in the oil and filter . change it before u have to replace the whole trans

its a fuel issue ! check fuel filter for clogging up with dirt.and be sure fuel pump is working properly.

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).

Thanks for using FixYa -a 4 THUMBS rating is appreciated for answering your FREE question.

The drain plug is on the bottom of the transmission. Its torqued to 49 nM.
1. Remove tranny oil pan drain plug
2. Drain old fluid (roughly 2-4 quarts)
3. Reinstall drain plug.
4. Measure amount drained in a 99 cent orange juice pitcher from Walmart
5. Pour back the same amount drained using Toyota Type T-IV fluid (available in 1 quart bottles from a Toyota dealer.
6. Start engine and shift slowly through all the gears ending in Park.
7. Check fluid level on the dipstick. Add fluid, if necessary, to bring the level to a point inbetween the COLD and HOT marks on the dipstick.
8. Go for a 20 minute drive and recheck fluid level. Add fluid, if necessary, to bring the level up to,
but not beyond, the upper half of the HOT range on the dipstick.

As in 1973, NO FLUSHING is needed and NO FILTER REPLACEMENT is needed, NO PAN REMOVAL is needed. As, as in 1973 todays Toyotas have a metal mesh filter screen that doesn't ever get clogged except in rare cases of transmission operational abuse, including failure to ever change the fluid for 150,000 miles or more.

Not other then having a oil pan large enough to hold the transmission oil that's going to drain from the transmission.

Drain the Transmission Fluid and Replace the Filter
Raise, support and level the buick on jack stands or ramps. Place a drain pan that can hold at least 4 quarts of fluid beneath the transmission.
Employ a socket wrench to remove the retaining bolts on the fluid pan, except for the two on either end. Loosen the two bolts on the lower end of the pan. Gently pull down on the edge of the pan so that it separates from the transmission case. Let the fluid drain. You may need to tap the pan with a rubber hammer to separate the pan from the case.
Remove the last four bolts and the pan when the fluid finishes draining. Loosen the bolts a little at a time, allowing the remaining fluid to drain. Clean the pan and the magnet inside.
Scrape the old sealant from the pan flange with an appropriate scraping tool. Do the same on the mating surface of the transmission case.
Remove the filter, Look for the filter and the O ring between the filter and valve body and remove it.
Install the new transmission fluid filter and gasket. Place the new gasket on the mounting flange of the fluid pan. Replace the fluid pan on the transmission and tighten the bolts to 165 inch pounds with a torque wrench. Return the Buick to the ground.
Replace the New Transmission Fluid
Pour 4 quarts of ATF fluid into the filler tube using a funnel. Start the engine and let it idle for a minute or two. Apply the parking brake and the service brake. Move the gear selector through the gears and stop at "Park" or "Neutral.
Add enough fluid to bring the level to 1/8 inch below the "Add" indicator, if needed. Let the van run for another 10 to 20 minutes to allow the engine and transmission to reach a normal operating temperature
Check the fluid level again to ensure it reached the "Hot" indicator on the dipstick. Add more fluid if needed and replace the dipstick in the filler tube. Turn off the engine.
Good luck and hope this helps.

Your transmission problem could be related to the TPS sensor. The TPS sensor indicated to the PCM when and what gear the transmission should be in. As for the Lucas and other additives to the transmission may be doing it more harm then good, As the transmission oil is thicker, the transmission line pressure increases. The PCM try's to compensate for that by letting the converter lock up clutch to slip and the fluid retention in the solenoid to change gears stick causing it to shudder between gear shifts. Recap, Check the TPS sensor readings and the Wire Harness. Look for loose connections and corrosion that may not be giving the proper readings to the ECM. Rescan the car for any DTC codes and most transmission chop can do that for you if your going to get it serviced there anyways. Have the transmission fluid flushed and filter changed, and have them do a transmission line pressure checked, there are additives out there to keep the fluid from foaming which is ok, but changing the fluid's weigh can cause transmission failure. Good luck and hope this helps and keep me posted, be glad to help.