I've got a FWD sienna xle with 233,000 miles and I've had for about a month or so and paid $2600 for it. ( I put $1267 last month to have someone put a timing belt, water pump, tensioner, and 2 roller bearings timing belt, 2 drive belts and new anti freeze in it.) Anyway, I bought the transmission Filter ,Gasket and O ring today. Its a WIX brand kit. I bought the fluid at O'Riellys ,its their fluid and I'm not to sure its the best to use so I might take it back and buy Toyota Original fluid at the stealership. I bought a new inch/ pound torque wrench 3/8th drive today to keep the right specs on it all. I need a crush washer, O ring for the dipstick tube, anyway. Besides their price for the fluid is $6.25 a quart , where as O'Riellys was $ 7.99. They did price match it though. So, I have a Rubber Gasket that WIX supplied in their kit. I don't know weather or not to use 'Permatex transmission gasket' maker on it or not. Some people say No ,you don't need any at all. Some say use it on the pan side only. Some say if it's a coated (FEL_PRO)with some kind of sealer already you don't need to and if you do it will create a leak. So, I tried to find out if it is coated but couldn't find that out. Watched a bunch of videos of the job. At least 2 of them said not to use any sealer if its rubber and might just do that. Who knows, its a guessing game, totally frustrating. Some say to use Lock -Tite on the all the bolts, so the fluid won't leak through them, not sure about that either. Well, I have time its snowing like 3 inches right now here in lower Michigan. Suppose to warm up to 45* by next Tuesday so that may be the pan and filter day. It's going to be an outside job on concrete.