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

4+3 cooler lines

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Old Jan 16, 2022 | 08:06 PM
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Default 4+3 cooler lines

Do all overdrive units have cooler lines?
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Old Jan 16, 2022 | 08:18 PM
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I have an 86 vert with the 4+3 and it has the cooling lines for the OD.
Since the OD is like an automatic transmission is seems likely to me that all 4+3's would have the cooling lines.
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Old Jan 16, 2022 | 10:39 PM
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My 84 4+3 does as well. ATF use in vehicles pretty much signifies the need for cooling in that unit as well. My truck's manual ZF6 transmission runs ATF, and a cooler. It also runs ATF in the steering pump, with a cooler.
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Old Jan 17, 2022 | 08:02 PM
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Default Lines missing

My lines are gone so iam thinking the od is dead or gutted. Was this a common thing people did? Is there a cheap trans replacement to go with a sraight 4 speed. Muncies are big $$
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Old Jan 17, 2022 | 08:12 PM
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Your 4+3 is a borg warner super T10.
do nothing and you have a quality 4 speed capable of handling 450 ft lbs of torque.
but because it’s there, go to a auto parts store and buy 20 ft of steel line, and hook the overdrive up to the oil cooler in the radiator, and fill it with fluid.
roll the rear tires backwards and refill overdrive.
add a power wire (12v) to the terminal on the left side of the overdrive and go for a drive.
be careful when letting the clutch out in second gear for the first time. It may work. This is tje most misunderstood transmission in the automotive world.
if it does work, message me for more info

Last edited by coupeguy2001; Jan 17, 2022 at 08:20 PM.
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Old Jan 19, 2022 | 08:19 PM
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just a vote of love and support for the 4+3.

love it
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Old Jan 20, 2022 | 07:22 AM
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Originally Posted by VikingTrad3r
just a vote of love and support for the 4+3.

love it
1st thing I did was ditch the 4+3. I'm sure they are great when working properly but...
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Old Jan 20, 2022 | 08:46 AM
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Default it is what it is

Here is the thing about changing things out. New transmission = min $2000, dont like the digital dash or converting to carb. = $1000 for autometer gauge set. Cant get tire size any more = $$$ well you get it and for a car thats not worth much (especially to the insurance company) that c4 is what it is. Like carbs buy a C3...like a better transmission or performance buy a c5 or better. A c4 is a c4. I drove them when they were new and they are cool. If I want better, I just get into my C7 and go for a drive.
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Old Jan 22, 2022 | 10:51 AM
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How do you get the upper line off the top of the transmission. I need a distributor wrench with a crows foot on it.
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Old Jan 22, 2022 | 12:07 PM
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i recall that being a challenge when i dropped my trans for a clutch job and good cleaning.

i *think* i used a stubby? maybe a crow? i do not recall building a custom tool (cutting an offset wrench with a grinder to make a special tool for example) so there must have been a way with off the shelf tools.

was there maybe a housing that can be pulled off? i cant recall. just know i didnt make a special tool.
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