Chevy Nova Forum banner
1 - 5 of 5 Posts

·
Registered
Joined
·
159 Posts
Discussion Starter · #1 ·
First of all. I wanted to drain my radiator, but don't want to pay to have it flushed. Can I just drain it myself and try to wash out what I can? And how much of my transmission fluid will this waste? Will I have to buy another quart for it?
:confused:


Also, I haven't dealt with the rear end since I bought this car, but I've never went through a diff. I'd like to find out the gears I'm running and such....and what I need to do to change the oil, etc.

Sorry I'm so begginer. :eek:


Thanks guys.
 

·
Registered
Joined
·
168 Posts
First Question: In my opinion there's not really any good reason to do a really intense flush of the transmission fluid unless you've some sort of failure with the tranny in which case I always replace the radiator. Transmission fluids already have a lot of detergent in them. Change it and replace the filter but I've never understood the flush it.

Second Question: Sometimes there's a tag hanging off one of the differential bolts that has the ratio. Look for the build sheet. Another way would be to use one of the many gear ratio calculators (google gear ratio calculator). With your tire size and rpm's at speed you can get a good idea. If you're desperate mark one of your tires with white chalk and mark the pinion with chalk. turn the wheel and calculate the ratio. Bounce what you think it might be off of the possible ratio's for the car.

I hope this helps.
 

·
Registered
Joined
·
159 Posts
Discussion Starter · #3 ·
First Question: In my opinion there's not really any good reason to do a really intense flush of the transmission fluid unless you've some sort of failure with the tranny in which case I always replace the radiator. Transmission fluids already have a lot of detergent in them. Change it and replace the filter but I've never understood the flush it.

Second Question: Sometimes there's a tag hanging off one of the differential bolts that has the ratio. Look for the build sheet. Another way would be to use one of the many gear ratio calculators (google gear ratio calculator). With your tire size and rpm's at speed you can get a good idea. If you're desperate mark one of your tires with white chalk and mark the pinion with chalk. turn the wheel and calculate the ratio. Bounce what you think it might be off of the possible ratio's for the car.

I hope this helps.
Well the flush I was talking about was for the radiator, because the coolant has so much rust and whatnot in it. I just didn't want to drain the radiator and have to replace a bunch of tranny fluid since the fluid comes in there also.

I don't have a tach so I'm not really sure that will help. I'll look for the tag tomorrow and see if that will work. Is the gear oil going to be depending on what type of rear and gears in it? And is it just a drain and fill procedure for changing the oil?
 

·
Premium Member
Joined
·
1,536 Posts
The tranny fluid passes through the radiator in tubing, the two fluids do not mix.......unless of course there is a hole in the tubing inside the radiator. Draining your radiator will not drain any transmission fluid so don't worry.

As for the rear, you will see bolts around the perimeter of a cover when looing at it from the rear of the car. You can remove those bolts and catch the fluid in a container. Clean the cover well and the mating surface on the differential before reinstalling. I prefer to use a gasket and put a thin coat of silicone on the gasket and stick it to the cover before installing it, while others will just use a bead of silicone on the cover and reinstall it.

There is a plug on the side of the differential.....some have a 3/8" square hole, while others just have a square end. That is your fill point, or to check the level. Most containers of differential fluid (I use 80W90) have a pointed cap which you can cut the tip off and squeeze it into the hole at the side of the differential. If you have posi, then you also have to put an additive in the differential. To tell if you have a posi unit, when up on jackstands turn one of the wheels.............if the other wheel turns in the same direction then you have a posi. I believe three litres of fluid will be adequate for filling.

Hope this helps.
 

·
Registered
Joined
·
159 Posts
Discussion Starter · #5 ·
The tranny fluid passes through the radiator in tubing, the two fluids do not mix.......unless of course there is a hole in the tubing inside the radiator. Draining your radiator will not drain any transmission fluid so don't worry.

As for the rear, you will see bolts around the perimeter of a cover when looing at it from the rear of the car. You can remove those bolts and catch the fluid in a container. Clean the cover well and the mating surface on the differential before reinstalling. I prefer to use a gasket and put a thin coat of silicone on the gasket and stick it to the cover before installing it, while others will just use a bead of silicone on the cover and reinstall it.

There is a plug on the side of the differential.....some have a 3/8" square hole, while others just have a square end. That is your fill point, or to check the level. Most containers of differential fluid (I use 80W90) have a pointed cap which you can cut the tip off and squeeze it into the hole at the side of the differential. If you have posi, then you also have to put an additive in the differential. To tell if you have a posi unit, when up on jackstands turn one of the wheels.............if the other wheel turns in the same direction then you have a posi. I believe three litres of fluid will be adequate for filling.

Hope this helps.
:yes: absolutely. thank you much 63akdn!! :D
 
1 - 5 of 5 Posts
Top