C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

4+3 Fluid Change

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Old Jul 16, 2006 | 04:08 PM
  #1  
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fastrtnu
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From: Hanover Ontario
Default 4+3 Fluid Change

How difficult is it to change the fluid in the OD and the regular transmission? The service manual makes it seem more difficult than I think it should be. Can someone with average skills do this or should I leave it to my mechanic? Also what type of fluid would you recommend? Stick with the Dexron AT fluid or something else?

Thanks, Save the WAVE!!!!
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Old Jul 16, 2006 | 06:05 PM
  #2  
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
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4speed fluid change is no different than any other manual.

fill it till it comes out the fill hole. This takes 2-3 quarts of 75w90 (or close) gear oil.

For the overdrive remove the pan and filter, replace filter (carefully) and reuse grommet if it's good, otherwise buy a new one of the right rubber material. Don't use a gasket for reinstalling the pan, just rtv. You need to add more than just to the fill hole though. Try filling it either while the car is running on jackstands overdrive (and fluid is being pumped through the system) or just jack the car at an angle to get a little more in.

For info on where to buy the filter and grommet go here and scroll down:
http://forums.corvetteforum.com/show...filter+grommet
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Old Jul 16, 2006 | 10:40 PM
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As alwys you've been a huge help.

My other question is do I really need to remove the X brace to change the fluid. I don't really want to go to the trouble of jacking up the car until I make sure I have all the parts/tools taht I'll need.
Thanks
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Old Jul 16, 2006 | 11:55 PM
  #4  
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From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
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Can't help you there, I've never dealt with the crossbrace. I can't think of any 4+3 vert owning grease monkeys off the top of my head.
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Old Jul 17, 2006 | 08:09 AM
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Before you drain the manual trans make sure you can get the filler plug out. I found out the hard way.
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