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Old 11-25-2016, 03:58 PM   #1
The Chris
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C5 auto trans

Team DC
I have a 98Y and I have lost my 3&4 gear in the transmission. My question is what's the best replacement? RPM stage 5 or a craigslist trans? The stock tranny made it 48k in the car
The car is a hot rod not a beauty queen, I plan on swapping heads and cam this spring time. 3.73 rear diff gear will also be installed with replacement trans. Stock wheels and tires
This car a salvage rebuild and this is not a daily driver

Thanks DC
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Old 11-25-2016, 04:17 PM   #2
maniacmechanic
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Quote:
Originally Posted by The Chris View Post
Team DC
I have a 98Y and I have lost my 3&4 gear in the transmission. My question is what's the best replacement? RPM stage 5 or a craigslist trans? The stock tranny made it 48k in the car
The car is a hot rod not a beauty queen, I plan on swapping heads and cam this spring time. 3.73 rear diff gear will also be installed with replacement trans. Stock wheels and tires
This car a salvage rebuild and this is not a daily driver

Thanks DC
The Chris
You lost or fried the 3-4 clutch in the 4L60E trans.
An accumulator piston may have failed causing all the headaches.

RPM is a good transmission but they are very expensive.
($5,000 -$10,000)
I like building myself. I know exact what I have then.
You may want to check local or regional around you.
See if you have a decent transmission builder around.

If your Street /Stripping the car or have intentions to,
They make conversion kits to install a Time Proven 100 % Reliable Turbo 400 Trans.
It may seem like a step backwards but it is not.
Serious drag racers have put 3,800 HP through a Turbo 400 trans. No Failures.
You cant do that with any other.

The 4L60E is safe to use up to 500-550 Hp. But its pushing it.
They live happy 300-425 Hp day in day out.
One key made in the USA Parts are gone....4L65E Planetary gearsets made in Ohio.
Only used made in 2005.
After that production went to Mexico.
Now China.
Ok till real drag race shock loads applied.

The stock 4L60E 4-pinion gearsets safe to use 200 HP-400 HP max typical.
Put more though it lives or don't. No Guarantee.
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Old 11-25-2016, 04:20 PM   #3
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The 4L80E will fit a C5 but the trans tunnel needs to be notched. Ditto for the firewall.
We had a C5 Drag Racer here in the past.
He knew all the ins and outs doing many custom swaps.
I recall his 2 cents tips.
Sadly he is no longer posting here.
Check the DC Archives about 2 years back on this topic.
Him & me held drag race school nightly on DC back then.
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Old 11-27-2016, 02:16 PM   #4
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Thanks maniac
I talked to a regional guy who has knowledge of these 4L60E trans. He may even have one on the shelf all ready to be installed, I'll keep my fingers crossed.
Any suggestions on T/C brands? I was thinking about a 3200 stall speed?
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Old 11-27-2016, 02:37 PM   #5
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I have a built 4L60E in a 4400 pound Impala SS running mid 11's and it's held up for about 50,000 miles so far and still going strong. I'm guessing that I'm right at 550 HP. I went with the 5 pinion planetary, Beast sunshell and the Raybestos Z-Pack clutches. The Alto red clutches with the kolene coated steels is also a good choice for horsepower but I don't think they last as long. I bought th parts and a local transmission shop installed everything for $400.00. If you have a good tranny shop around that might be worth considering.
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For most of human history,
Vehicles had automatic collision avoidance and
Could even take you home if you were sleeping or drunk.
Then we got rid of the horse

Old 11-27-2016, 05:32 PM   #6
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There is alot of debate among transmission builders what are best for friction materials.
The Early 700R4 & 4L60E transmissions up to about 1995 used Brown paper clutches or Called TANS with plain steel plates.
Around 1996 GM switched to High Energy frictions.. Green in color.
Aftermarket Like Alto makes Red Eagle Frictions & Kolene salt bath treated steel plates or Just STEELS for short.
Then Raybestos makes Heavy Duty Blue friction plates for use with plain STEELS. Do not use Blue frictions with Kolene Steels/ incompatible.

Many are now Mixing all types of frictions into 1 trans build.
Also Carbon Fiber has been introduced into 3-4 clutch packs for 700R4 & 4L60E transmissions.

The Pros are flip flopping around constant what is best.
I used Alto Red Eagle Frictions & Kolene steels in my 700R4 trans. for my 1987 C4 Vert.
Around 50,000 miles of hard use now.
Still shifts perfect as I when I built it in 2010.
I have found not all transmission fluids are equal.
Different shift feels with different brands.
Was using Royal Purple Max ATF synthetic.
I switched to Castrol GTX Transmax Dextron-Mercon Formulation. Bought from Advanced Auto. I like the shift feel better.
If you want super aggressive then Choose Type F Ford ATF from a specialty Race oil manufacturer.

Torque converter brand...?
The Best are custom built by hand per order called in.
$900 -$5,000 or more.
Gunny likes the Purple Torque converter Precision Vigilante.
My Newest choice is HUGHES Torque converters.

I am set to build 2 transmissions very soon.
A 1969 Pontiac Turbo 400.
A 1994 K1500 Chevy GMC 4L60E Trans.
Both I purchased Alto Red Eagle Frictions & Kolene Steels.
The Turbo 400 I bought a Hughes Torque Converter.
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Old 12-30-2016, 07:30 PM   #7
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Quick update: I got the transmission rebuilt by a local guy in about 72hrs, he did the rebuild for 2k including a new converter. Did 9 clutch, sunshell, belts and the internal stuff I do not know. He did show me a box full of parts and I stopped by and seen it all torn down. Fingers crossed. My buddy says just run Napa dex6 ? He is redneck, I was thinkn let's fill it once full of royal purple?
Took the rear diff. To my diff gear guy and he is doing a eaton wave runner posi and a 3.73 ring gear for 2k. The carrier alone was $900 I think this is a good improvement while I got the trans out of the car, it's just $
Other than that I will replace 1 r.r. Lower ball joint and sway bar links were broken (plastic) torque tube looks like it has been replaced. This is the 3rd transmission as far as I can tell
These guys are all local and I live way out in the sticks. Good to know people that will stand behind their work. I'm into this whole car with all these upgrades for about $8k currently
Wheels and tire shopping next. Car came with 22" on the rear and 20" upfront. Not my style....I like the repoduction wheels and put $ on the rubber
I'm so excited for my first drive thru cow town in my Vette
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Old 12-30-2016, 11:51 PM   #8
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The rear is a eaton track aid carrier not a waver runner
Plan on computer tune after break in
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Old 01-09-2017, 05:44 PM   #9
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Parts are done

Got the rebuilt transmission and new TC sitting on the floor
Diff is re-geared 3.73 and new Eaton carrier, picking it up this week. The stock posi had broken springs
Made a trans tunnel plate out of 1/4" aluminum and heat Wrapped it. Also put heat shield on trans tunnel
Ordered 12qt Mobil 1 dex 6 atf and 2qt redline rear gear oil
I read the rpm fill procedure and got a drill pump to help
Wheels and tires are the next big purchase
Excited to start going back together this weekend
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Old 01-11-2017, 07:54 PM   #10
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Online tire sales

Anyone know a cheap online seller for tires?
I found some killer wheels on west coast corvette under 1k
Tirerack? Any other place to check, I'm looking at 19" rear and 18" front
I don't care what brand as long as they are rated for the speed and reasonably priced or free shipping, my tire budget is 1k+\-
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