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

Tranny?

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Old Nov 20, 2003 | 03:36 PM
  #1  
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Default Tanny?

Hey guys, I'm just trying to learn a bit more about our Tranny's.

I seem to be reading a lot of post of forum members having their tranny's rebuilt and this brought up a few questions.

1- Since 1984 to 1996 what type of tranny's were available and what are the model names of there tranny's.
2 - does the ZR1 corvette have the same type of tranny?
3 - I have an 88, automatic, how many gears does the tranny have? do I already have a oil tranny cooler already installed?
4 - I know I have a shift kit installed in my tranny, shift harder, shift at higher RPM, could someone explain in detail how they make this happen or can someone guide me to a web site. (I know how it works with a torque converter, but I don't exactly know what a shift kit is)

Thanks! :cheers: :cheers:
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Old Nov 20, 2003 | 04:17 PM
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Default Re: Tanny? (TheStef)

Hey guys, I'm just trying to learn a bit more about our Tranny's.

I seem to be reading a lot of post of forum members having their tranny's rebuilt and this brought up a few questions.

1- Since 1984 to 1996 what type of tranny's were available and what are the model names of there tranny's.
2 - does the ZR1 corvette have the same type of tranny?
3 - I have an 88, automatic, how many gears does the tranny have? do I already have a oil tranny cooler already installed?
4 - I know I have a shift kit installed in my tranny, shift harder, shift at higher RPM, could someone explain in detail how they make this happen or can someone guide me to a web site. (I know how it works with a torque converter, but I don't exactly know what a shift kit is)

Thanks! :cheers: :cheers:
85-91? had the 700R4, single valve mechanically controlled
92-93 had the 4L60, double valve mechanically controlled
94-96 had the 4L60E, double valved electronically controlled

ZR-1's had a manual transmission, ZF6 I believe

88's should have a 4 speed tranny. There is a factory tranny cooler installed in the radiator. To know if you have an additional cooler look at the small metal lines going to the passanger side of the radiator. If they go directly in then you don't have an extra cooler, if one of them is branched off and goes inside the radiator shroud then you do. Also look under your nose up into the radiator cavity if you see an extra little cooler infront of the A/C unit, that's probably an additional tranny cooler

A shift kit basically makes the tranny shift quicker, it does not change the shift points, you need a different kit for that. It does this by changeing the passage ways fo the fluid for the shifts inside the tranny. do a search on the web for "transgo shift kit install".
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Old Nov 20, 2003 | 07:05 PM
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Default Re: Tanny? (TheStef)

You have a 700R4, you have 3 gears and an OD, there is a factory cooler, but it is woefully inadequate, which is why we tell you to add one.
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Old Nov 20, 2003 | 07:12 PM
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Default Re: Tanny? (TheStef)

The later 88?89? up 700R4 trans is stronger than the earlier700R4 trans.
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Old Nov 20, 2003 | 07:19 PM
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Default Re: Tanny? (britvette)

Aprox how much is an External cooler? and can this be ordered in a kit and is the install fairely simple?
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Old Nov 21, 2003 | 11:23 AM
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Default Re: Tanny? (TheStef)

Go to http://www.summitracing.com and do a search for B&M cooler in the text search. You should come up with a result that says "24,000 GVW, 11 in. x 6 in. x 1 1/2 in., transmission cooler" This should be what you need. Part# BMM-70264 Install is easy and takes less than an hour the hardest part is taking the bolts off of the radiator shroud.
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Old Nov 21, 2003 | 01:29 PM
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Default Re: Tanny? (mn_vette)

85-91? had the 700R4, single valve mechanically controlled
92-93 had the 4L60, double valve mechanically controlled
94-96 had the 4L60E, double valved electronically controlled
My 1990 has a 4L60 :yesnod: :cheers:
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Old Nov 21, 2003 | 02:58 PM
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Default Re: Tanny? (IBEAM700)

49$ that's not expensive.. cool!

Just once question, will the stock cooler still be cooling down the tranny oil and this cooler is like and add on for extra cooling? or is this part a complete replacement and no more tranny oil will be flowing through the stock radiator?
do you need any extra plumbing to get this setup or does it just bolt on?
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Old Nov 21, 2003 | 04:42 PM
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Default Re: Tanny? (IBEAM700)

85-91? had the 700R4, single valve mechanically controlled
92-93 had the 4L60, double valve mechanically controlled
94-96 had the 4L60E, double valved electronically controlled

My 1990 has a 4L60 :yesnod: :cheers:
Not from the factory it didnt. 4L60 started when in 92.
If you have 4L60, somebody put it in there.
It is only a name change really, part of GMs standardization of naming things.
The differences are minor, its almost exactly the same thing as a 700r4 and they are totally interchangeable provided both are for Corvette.
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Old Nov 21, 2003 | 06:05 PM
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Default Re: Tanny? (vader86)

I agree the 700R4 and the 4L60 are the same transmission, but the 1990 does have the 4L60. I thought they were exactly the same, so I purchased an aluminum Trans pan with a drain plug so I would have to deal with the mess when changing the filter and the damn thing didn’t fit. The pan wasn’t deep enough.
Oh, and the factory service manual refers to the automatic transmission as a 4L60.
Im certain this is an original 4L60

:cheers:
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