tranny fluid level - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 05-01-2006, 06:14 PM

I know they say not to overfill. I got mine like at the most a 1/4 inch over the full line should I be concerned with this or is it close enuf?

Thanks I think I am being over concerened.

Longhorn Man · 05-01-2006, 06:19 PM

you are better to be low than to be overfull.
I would drain it out.

76bonanza · 05-01-2006, 06:40 PM

Really I did not think that little bit over would do any harm? Anyway I have only drove it twice since filter change and would swear after the first time driving it it was good will check it a few more times before I do anything.

matthufham · 05-01-2006, 07:18 PM

take a cooling line out of the radiator for a little bit. that should drain enough and you should check it after driving it so the transmission cycles the fluid.

Longhorn Man · 05-01-2006, 07:32 PM

you won't feel anything.
What happens, the fluid will get areated.... foamy, and the bubbles will be on the clutch packs instead opf the oil.... and that'll cause exsesive wear.
We aren't talking it'll crap out next week, but it WILL shorten the life of the tranny.

76bonanza · 05-01-2006, 11:15 PM

I see, I have a hand pump thingy so I think I can pump it out of the dipstick easy enuf. How much do you think a 1/4 inch on the dipstick is? Half a pint?
Also when I check it I have driven for about 15 minutes from work should I cycle thru the gears when I get home right before I check it?

Longhorn Man · 05-01-2006, 11:44 PM

yes...always.
By cycling through the gears, you are filling up the entire valve body, and checking the resrve oil level in the pan.

76bonanza · 05-02-2006, 06:49 PM

Hey longhorn man thanks for your help came home today went thru the gears then checked it, right below the full line. One question the bolts on the tranny pan do I need to go back and recheck them in a few days or if it dont leak dont touch it? Also I was checking it close for leaks nothing so far but I noticed in some places the gasket is getting a little wet, is this the sign of a leak starting or is it normal for some fluid to wick thru the gasket and keep it damp around the pan? kind of like my oil pan never drips but is always damp.

Again thanks for your help you are a life saver.

Longhorn Man · 05-02-2006, 07:11 PM

I would recheck them, but you're probably OK.
i have found that they are more likely to leak from over tightening rather than too loose.
I would monitor the damp points for a while and deal with it if need be.

05-01-2006, 06:14 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	tranny fluid level I know they say not to overfill. I got mine like at the most a 1/4 inch over the full line should I be concerned with this or is it close enuf? Thanks I think I am being over concerened. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-01-2006, 06:19 PM	#2
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: tranny fluid level you are better to be low than to be overfull. I would drain it out.

05-01-2006, 06:40 PM	#3
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: tranny fluid level Really I did not think that little bit over would do any harm? Anyway I have only drove it twice since filter change and would swear after the first time driving it it was good will check it a few more times before I do anything. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-01-2006, 07:18 PM	#4
matthufham Registered User Join Date: Feb 2005 Location: Carl Junction, Missouri Posts: 2,061	Re: tranny fluid level take a cooling line out of the radiator for a little bit. that should drain enough and you should check it after driving it so the transmission cycles the fluid.

05-01-2006, 07:32 PM	#5
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: tranny fluid level you won't feel anything. What happens, the fluid will get areated.... foamy, and the bubbles will be on the clutch packs instead opf the oil.... and that'll cause exsesive wear. We aren't talking it'll crap out next week, but it WILL shorten the life of the tranny.

05-01-2006, 11:15 PM	#6
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: tranny fluid level I see, I have a hand pump thingy so I think I can pump it out of the dipstick easy enuf. How much do you think a 1/4 inch on the dipstick is? Half a pint? Also when I check it I have driven for about 15 minutes from work should I cycle thru the gears when I get home right before I check it? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-01-2006, 11:44 PM	#7
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: tranny fluid level yes...always. By cycling through the gears, you are filling up the entire valve body, and checking the resrve oil level in the pan. Last edited by Longhorn Man; 05-01-2006 at 11:45 PM.

05-02-2006, 06:49 PM	#8
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Re: tranny fluid level Hey longhorn man thanks for your help came home today went thru the gears then checked it, right below the full line. One question the bolts on the tranny pan do I need to go back and recheck them in a few days or if it dont leak dont touch it? Also I was checking it close for leaks nothing so far but I noticed in some places the gasket is getting a little wet, is this the sign of a leak starting or is it normal for some fluid to wick thru the gasket and keep it damp around the pan? kind of like my oil pan never drips but is always damp. Again thanks for your help you are a life saver. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-02-2006, 07:11 PM	#9
Longhorn Man its all about the +6 inches Join Date: Jan 2001 Location: Hilliard Ohio Posts: 2,693	Re: tranny fluid level I would recheck them, but you're probably OK. i have found that they are more likely to leak from over tightening rather than too loose. I would monitor the damp points for a while and deal with it if need be.



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