Steps to change the transmission fluid
Hey Guys,
I spoke to the original owner of the 1980 vette and he said that he never changed the tranny fluild. I have had it since 2011 and have not changed it, I think it is time, just to be safe. I have never done this before so a detailed step-by-step would be helpful and all tips and suggestions are welcome. Tools needed, parts to get, jack up on side of the car so it pours out better, etc. I did a search but all I saw was for newer corvettes and discussions about using ATF or not. And should I do the diff at the same time or separately? Thanks. |
Hi S,
What year is your car? Do you have the Chassis Service Manual for it? In the 71 CSM in the Transmission Section there's a 10 step guide to Draining and Refilling the Transmission'. It section 7-45. The guide for doing the job begins with; "Raise car on a hoist or place it on jack stands…." and ending with " check fluid level with selector lever in park, engine running, and vehicle on a level surface". It also lists the parts that need to be replaced… o-ring, filter, pan gasket, and amount of fluid. Good Luck! Regards, Alan |
Originally Posted by Alan 71
(Post 1594982955)
Hi S,
What year is your car? Do you have the Chassis Service Manual for it? In the 71 CSM in the Transmission Section there's a 10 step guide to Draining and Refilling the Transmission'. It section 7-45. The guide for doing the job begins with; "Raise car on a hoist or place it on jack stands…." and ending with " check fluid level with selector lever in park, engine running, and vehicle on a level surface". It also lists the parts that need to be replaced… o-ring, filter, pan gasket, and amount of fluid. Good Luck! Regards, Alan |
Hi S,
It appears the early manuals used at the dealerships were called Chassis Service Manuals, and the later manuals were called Shop Manuals. Is this what you have? Have you looked carefully through the automatic transmission section for the instructions on changing the transmission fluid? Regards, Alan http://imagizer.imageshack.us/v2/640...924/9riAtQ.jpg |
Originally Posted by Alan 71
(Post 1594983362)
Hi S,
It appears the early manuals used at the dealerships were called Chassis Service Manuals, and the later manuals were called Shop Manuals. Is this what you have? Have you looked carefully through the automatic transmission section for the instructions on changing the transmission fluid? Regards, Alan http://imagizer.imageshack.us/v2/640...924/9riAtQ.jpg Mine is a manual by the way. |
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Originally Posted by Mr D.
(Post 1594984265)
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Originally Posted by ~Stingray
(Post 1594984575)
I did read through this earlier. But I wanted to make sure there wasn't something different to worry about for the manual. I know there is no torque converter so a flush is not needed.
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Originally Posted by ~Stingray
(Post 1594983791)
Mine is a manual by the way.
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Originally Posted by ~Stingray
(Post 1594984575)
I did read through this earlier. But I wanted to make sure there wasn't something different to worry about for the manual. I know there is no torque converter so a flush is not needed.
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I also have a 1980 with a 4 speed. The transmission takes 80-90 weight gear oil. It is very simple to change:
Raise the car up so that it is level. Un-screw the drain plug on the lower side of the transmission to drain the fluid. Reinstall the drain plug. Remove the fill plug. Fill with gear oil until it reaches the bottom of the fill plug opening. Replace the fill plug. |
Originally Posted by Mr D.
(Post 1594984584)
there is no torque converter ?
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Originally Posted by jlpskydive
(Post 1594984866)
If it's a 5 or 4 speed manual car, it's TOTALLY different and you need to look at a different section of the book. Now with that being said some 4 and 5 speed cars use ATF in the gear box, but I don't think yours is one of them.
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Originally Posted by ~Stingray
(Post 1594985404)
Its a 4 speed.
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Hi,
I was thinking... automatic transmission because aft was mentioned in the first post. The service information for the 4-speed indicates SAE 80 gear lube. Regards, Alan |
Originally Posted by Alan 71
(Post 1594988816)
Hi,
I was thinking... automatic transmission because aft was mentioned in the first post. Regards, Alan |
Originally Posted by ~Stingray
(Post 1594989896)
Sorry to have confused you. I was reading online that many people put ATF in a manual. And even some companies to it today. So I wasn't sure if it applied today, well, back then rather.
Changing the gear lube out in a 4-Speed is just hitting the easy button. Pull the fill plug than the drain plug and refill with approved gear lube. I would not use AFT in a Corvette manual transmission. |
As Mark 78 79 said. I would just add to have the car as level as possible. Because the gear oil will not be to the desired level if the front is jacked up in the air when you fill it.
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Originally Posted by ~Stingray
(Post 1594982829)
Hey Guys,
I spoke to the original owner of the 1980 vette and he said that he never changed the tranny fluild. I have had it since 2011 and have not changed it, I think it is time, just to be safe. I have never done this before so a detailed step-by-step would be helpful and all tips and suggestions are welcome. Tools needed, parts to get, jack up on side of the car so it pours out better, etc. I did a search but all I saw was for newer corvettes and discussions about using ATF or not. And should I do the diff at the same time or separately? Thanks. I changed mine recently in my '72. Here's what I did: 1. Run the car for a while to get tranny oil nice and warm. 2. Jack it up in the front and rear enough to get under there with some tools and a drain pan. 3. I removed both the fill plug and the drain plug with a good quality, large crescent wrench - an open ended 9/16 wrench will also work (did on mine, anyway) but you'll need a large tool with some leverage to get those plugs loose. 4. Let all of the old oil drain out of the tranny case - give it some time. 5. Clean off your drain and fill plugs and reinstall the drain plug and snug it down. 6. I purchased Sta-Lube 80-90w GL4 gear oil (2 qts) from Napa for my tranny. https://www.napaonline.com/en/p/SLRSL24229 Also, I had to call ahead and get them to get two quarts from the warehouse for me to pick up. They only had the gallon jug in the store, and I didn't need that much. 7. You'll need some method to pump the gear oil up into the tranny fill hole - Napa sells a cheap little siphon pump you can use - I had one on hand already, so I don't know the part number. Just ask the counter guy. 8. Pump the oil into the tranny until it starts to run out of the fill hole. It will take about a quart and a half. 9. Snug down both fill and drain plugs. 10. Wipe everything down, remove the car off the jackstands. 11. Have a nice cold beverage. :yesnod: |
:withstupid:
What he said... Only thing I would suggest is that you install a good quality synthetic gear oil, instead of organic stuff. The gearbox is a bunch of working gears/bushings/bearing/shafts/etc. The better lube those 'sliding' parts have, the longer it will last. Synthetic lube is SOOOooo much better than the regular stuff, you just shouldn't put the stuff specified in a 40 year-old manual in it. |
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