to flush transmission or not to flush?

cola · 02-15-2008, 12:56 PM

Hi everyone
I have a 68 cutlass s that I picked up a little while ago. The car has been sitting for about 7 years. It has been started and moved up and down the drive way but no further. I wondering if I should have the tranny flushed in the spring and have the gasket and filter changed? I've heard several opinions. One no because this will loosen up any deposits and possibly cause damage. Second similarly the new oil will cause the same thing to happen. Anyone have any thoughts on this?

Thanks

The_Jeremiah · 02-15-2008, 01:18 PM

Well with a new filter, those deposits will break loose, and get stuck into the new filter, I would recommend it, because the fluid starts to break down. and if the filter is clogged, every time your run it, your running dirty fluid through the transmission, over time that will cause more damage than anything.

rrielley · 02-15-2008, 02:38 PM

I would have to agree with the Jeremiah. I have heard this ridiculous theory before that it is better to NOT change really old engine oil or transmission fluid. That is a rubbish idea! Old oil/fluid is bad. New oil/fluid is good.

cola · 02-15-2008, 02:54 PM

Hi everyone
Thanks
I thought the same thing. That oil's been sitting for probably 39 years. I can't see that being good.

cola

Olds64 · 02-15-2008, 03:49 PM

That is a very bad thing. Even if flushing out the old fluid causes debris to break loose it wouldn't harm that transmission. I have never heard of a TH 350 or TH 400 failing from old age. Towing, racing, bad / no fluid, or overheating but not old age.

J-(Chicago) · 02-15-2008, 09:05 PM

You wouldn't believe the awful chunks of garbage that I've pulled out of my pan. Change your fluid often, mine always has crap dropping out of it, but always keeps on going

shaks 442 clone · 02-15-2008, 10:12 PM

i've heard in new cars changing very old trans fluid can cause slipping

infact my buddy who works at oil changers just changed his trans fluid out and guess what

the second he went to floor it guess what he was doing about 5 miles per hour and slowly rising to about 10mph then it wouldnt go any faster

but i have never heard anything about the turbo 350's or 400's

shaks 442 clone · 02-15-2008, 10:13 PM

by the way he has a 89 ford mustang if anybody was wondering

J-(Chicago) · 02-16-2008, 09:01 AM

Mine feels like it's slipping for a while, after every time that I change fluid.
I always put the lucas additive in a few days later once it's used to the new blood, and then it drives just fine for another 30,000 miles.

shaks 442 clone · 02-16-2008, 10:27 AM

haha the lucas additive works miracles

i put some in a trans that was slipping a 93 isuzu trooper and the slipping totally went away for the first hundered miles then it came back

once it was time to sell it guess what went right back in the trans lol

02-15-2008, 12:56 PM	#1 (permalink)
cola Junior Member Join Date: Dec 2007 Posts: 16	to flush transmission or not to flush? Hi everyone I have a 68 cutlass s that I picked up a little while ago. The car has been sitting for about 7 years. It has been started and moved up and down the drive way but no further. I wondering if I should have the tranny flushed in the spring and have the gasket and filter changed? I've heard several opinions. One no because this will loosen up any deposits and possibly cause damage. Second similarly the new oil will cause the same thing to happen. Anyone have any thoughts on this? Thanks

02-15-2008, 01:18 PM	#2 (permalink)
The_Jeremiah Senior Member Join Date: Jul 2007 Posts: 247	Well with a new filter, those deposits will break loose, and get stuck into the new filter, I would recommend it, because the fluid starts to break down. and if the filter is clogged, every time your run it, your running dirty fluid through the transmission, over time that will cause more damage than anything. __________________ 69 Cutlass 4 door. Built 350 inside, grandma's grocery getter outside. Best sleeper in disguise.

02-15-2008, 02:38 PM	#3 (permalink)
rrielley Member Join Date: Jan 2008 Location: London Posts: 52	I would have to agree with the Jeremiah. I have heard this ridiculous theory before that it is better to NOT change really old engine oil or transmission fluid. That is a rubbish idea! Old oil/fluid is bad. New oil/fluid is good. __________________ Ray '72 Supreme

02-15-2008, 02:54 PM	#4 (permalink)
cola Junior Member Join Date: Dec 2007 Posts: 16	to flush tranny Hi everyone Thanks I thought the same thing. That oil's been sitting for probably 39 years. I can't see that being good. cola

02-15-2008, 03:49 PM	#5 (permalink)
Olds64 Landyacht Club President Join Date: Jul 2007 Location: Lawton, OK Posts: 1,590	That is a very bad thing. Even if flushing out the old fluid causes debris to break loose it wouldn't harm that transmission. I have never heard of a TH 350 or TH 400 failing from old age. Towing, racing, bad / no fluid, or overheating but not old age. __________________ "Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983 "We rei-eign, supreme, ooooh god! Burrito supreme, and a chicken supreme, and a CUTLASS SUPREME!" Tenacious D 2007

02-15-2008, 09:05 PM	#6 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 1,583	You wouldn't believe the awful chunks of garbage that I've pulled out of my pan. Change your fluid often, mine always has crap dropping out of it, but always keeps on going __________________ I'd rather have a numbers matching poker hand.

02-15-2008, 10:12 PM	#7 (permalink)
shaks 442 clone Senior Member Join Date: Apr 2007 Location: hayward, california Posts: 229	i've heard in new cars changing very old trans fluid can cause slipping infact my buddy who works at oil changers just changed his trans fluid out and guess what the second he went to floor it guess what he was doing about 5 miles per hour and slowly rising to about 10mph then it wouldnt go any faster but i have never heard anything about the turbo 350's or 400's __________________ my cutlass as of 08/27/2007

02-15-2008, 10:13 PM	#8 (permalink)
shaks 442 clone Senior Member Join Date: Apr 2007 Location: hayward, california Posts: 229	by the way he has a 89 ford mustang if anybody was wondering __________________ my cutlass as of 08/27/2007

02-16-2008, 09:01 AM	#9 (permalink)
J-(Chicago) Seasoned beater pilot. Join Date: Jan 2007 Location: Chicago Posts: 1,583	Mine feels like it's slipping for a while, after every time that I change fluid. I always put the lucas additive in a few days later once it's used to the new blood, and then it drives just fine for another 30,000 miles. __________________ I'd rather have a numbers matching poker hand.

02-16-2008, 10:27 AM	#10 (permalink)
shaks 442 clone Senior Member Join Date: Apr 2007 Location: hayward, california Posts: 229	haha the lucas additive works miracles i put some in a trans that was slipping a 93 isuzu trooper and the slipping totally went away for the first hundered miles then it came back once it was time to sell it guess what went right back in the trans lol __________________ my cutlass as of 08/27/2007

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