4L60e Autobahn
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Teching In
Joined: Oct 2015
Posts: 5
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4L60e Autobahn Hello folks. I'm Ax and I'm a new buyer of a 94 Chevrolet Camaro Z28 with 5.7 motor automatic. I'm from Hanover Germany. I'm a GM enthusiast so know a little about GM cars and am a fan of the older cars. The guy I bought the car from was actually a retired American that had the transmission sent out to be rebuilt about 500 miles before selling. He showed me documentation on the cars history. We talked about the car for 3 days before making my decision. The car is pretty much mint condition. Before buying the car he showed me around and has a B&M cooler in front of radiator and bypassed radiator cooling. I've actually been a regular reader of this forum prior to buying the car I was looking for so I would know what to expect and what to look out for.
Question though how well does the 4L60e like to cruise 200-250km/h? 120-150mph. I've heard the 3-4 clutches go bad often. I drove the car to a low 130km/h home on the autobahn today just to get a feel for the car and ran great. Drives good and shifts good. The cooler looks to be a 70264 to be specific. Just wondering if high speed will not overheat the clutches if driven with a light foot on the top end. Regular acceleration and not hammering it too top speed. it with good air flow to cooler.
Car has 153km on it
Brakes are new
Suspension is Koni shocks with BMR springs.
All fluids are clean and topped off.
And car is all stock with stock torque converter.
Ran like a champ on the way to my house.
I also own an Audi RS5 and been driving the autobahn for the past 4 years and no problems on engine and transmission.
Hope you guys can help
Question though how well does the 4L60e like to cruise 200-250km/h? 120-150mph. I've heard the 3-4 clutches go bad often. I drove the car to a low 130km/h home on the autobahn today just to get a feel for the car and ran great. Drives good and shifts good. The cooler looks to be a 70264 to be specific. Just wondering if high speed will not overheat the clutches if driven with a light foot on the top end. Regular acceleration and not hammering it too top speed. it with good air flow to cooler.
Car has 153km on it
Brakes are new
Suspension is Koni shocks with BMR springs.
All fluids are clean and topped off.
And car is all stock with stock torque converter.
Ran like a champ on the way to my house.
I also own an Audi RS5 and been driving the autobahn for the past 4 years and no problems on engine and transmission.
Hope you guys can help
Last edited by Michelinpilot; Oct 20, 2015 at 08:24 PM.
You have a situation we all would love to have in North America-being able to cruise for an hour or two at a comfy 120-150(our best speed limit is 120 km/h) mph!Hopefully some of the resident experts here will have some good advice,not many over here have spent more than a few minutes at those speeds.
Moderator
Joined: Aug 2010
Posts: 7,323
Likes: 529
From: Ann Arbor, MI
I would suggest the following transmission upgrades:
1. Sonnax 4L60E-LB1 boost valve. (I think its the -LB1 model, but I don't know for sure that this fits a '94.) This will increase line pressure across the board and increase the max line pressure available. This reduces slippage of clutches, especially the 3/4 clutch.
2. Billet 4th gear servo piston. While you are at it, might as well get the 2nd gear servo piston too. A billet 4th gear servo piston is recommended for any extended WOT 4th gear driving, which is rare in the US outside of some race tracks. This prevents the band from slipping in 4th gear.
1. Sonnax 4L60E-LB1 boost valve. (I think its the -LB1 model, but I don't know for sure that this fits a '94.) This will increase line pressure across the board and increase the max line pressure available. This reduces slippage of clutches, especially the 3/4 clutch.
2. Billet 4th gear servo piston. While you are at it, might as well get the 2nd gear servo piston too. A billet 4th gear servo piston is recommended for any extended WOT 4th gear driving, which is rare in the US outside of some race tracks. This prevents the band from slipping in 4th gear.
TECH Fanatic
Joined: Jan 2015
Posts: 1,114
Likes: 33
From: Fort Worth, Texas
The LB1 fits a '94 4L60E, I agree with the 4th Super Hold servo as well, His car should already have a "093" Vette 2nd servo (Factory).
I hope the rebuilder used the factory style "High Speed" Reaction Planet. Its sole purpose is to better oil the pinions at high speed.
I would be more concerned with the drive shaft & Differential bearings...Especially the wheel bearings. The 7.625 10-bolt is bad about shelling bearings & axles on V6 cars....Even worse on V8 cars. Have the Axles pulled to check the bearing surfaces, GM did a crappy job on case hardening where the bearings ride.
A Aluminum drive shaft out of a LS1/4L60E car should fit, Not sure I would trust the Steel one you have now at a Buck-Fifty. At the very least have it balanced.
I hope the rebuilder used the factory style "High Speed" Reaction Planet. Its sole purpose is to better oil the pinions at high speed.
I would be more concerned with the drive shaft & Differential bearings...Especially the wheel bearings. The 7.625 10-bolt is bad about shelling bearings & axles on V6 cars....Even worse on V8 cars. Have the Axles pulled to check the bearing surfaces, GM did a crappy job on case hardening where the bearings ride.
A Aluminum drive shaft out of a LS1/4L60E car should fit, Not sure I would trust the Steel one you have now at a Buck-Fifty. At the very least have it balanced.
Thread Starter
Teching In
Joined: Oct 2015
Posts: 5
Likes: 0
The LB1 fits a '94 4L60E, I agree with the 4th Super Hold servo as well, His car should already have a "093" Vette 2nd servo (Factory).
I hope the rebuilder used the factory style "High Speed" Reaction Planet. Its sole purpose is to better oil the pinions at high speed.
I would be more concerned with the drive shaft & Differential bearings...Especially the wheel bearings. The 7.625 10-bolt is bad about shelling bearings & axles on V6 cars....Even worse on V8 cars. Have the Axles pulled to check the bearing surfaces, GM did a crappy job on case hardening where the bearings ride.
A Aluminum drive shaft out of a LS1/4L60E car should fit, Not sure I would trust the Steel one you have now at a Buck-Fifty. At the very least have it balanced.
I hope the rebuilder used the factory style "High Speed" Reaction Planet. Its sole purpose is to better oil the pinions at high speed.
I would be more concerned with the drive shaft & Differential bearings...Especially the wheel bearings. The 7.625 10-bolt is bad about shelling bearings & axles on V6 cars....Even worse on V8 cars. Have the Axles pulled to check the bearing surfaces, GM did a crappy job on case hardening where the bearings ride.
A Aluminum drive shaft out of a LS1/4L60E car should fit, Not sure I would trust the Steel one you have now at a Buck-Fifty. At the very least have it balanced.
Coolant temps stay under the 2nd mark. Not sure about transmission temps since its bypassed radiator. Anyways soon I'll look into mods for acceleration and higher top speed.
TECH Junkie
Joined: Dec 2012
Posts: 3,620
Likes: 1,332
From: Iowa
Heat is a big enemy of transmissions. Having a cooler installed is a great start. I'd get a temp gauge hooked up and keep an eye on it for good measure. I don't like to see over 200 (93 C) with 210 (99 C)being the point I'd pull over and let her cool off.
See back to post #3 from mrvedit. He explains a couple mods and how they work. Essientially they hold the clutch packs tighter so there is less chance for slippage.
The servo is on the side of the case and the other mods are to the valvebody. Both should be able to be completed with the trans in the car. The servo is kindof a bear to get to but can be done.
If you drop the pan to change anything in the valvebody, i'd just go ahead and get all new solenoids. It's probably not neccessary but at $10 a piece, it's just nice insurance for me.
ps im incredibly jealous that you said you did 245 (153mph) for 12 minutes like it was no big deal.
I wish I could do that here in the states!
See back to post #3 from mrvedit. He explains a couple mods and how they work. Essientially they hold the clutch packs tighter so there is less chance for slippage.
The servo is on the side of the case and the other mods are to the valvebody. Both should be able to be completed with the trans in the car. The servo is kindof a bear to get to but can be done.
If you drop the pan to change anything in the valvebody, i'd just go ahead and get all new solenoids. It's probably not neccessary but at $10 a piece, it's just nice insurance for me.
ps im incredibly jealous that you said you did 245 (153mph) for 12 minutes like it was no big deal.
I wish I could do that here in the states! Trending Topics
Thread Starter
Teching In
Joined: Oct 2015
Posts: 5
Likes: 0
Heat is a big enemy of transmissions. Having a cooler installed is a great start. I'd get a temp gauge hooked up and keep an eye on it for good measure. I don't like to see over 200 (93 C) with 210 (99 C)being the point I'd pull over and let her cool off.
See back to post #3 from mrvedit. He explains a couple mods and how they work. Essientially they hold the clutch packs tighter so there is less chance for slippage.
The servo is on the side of the case and the other mods are to the valvebody. Both should be able to be completed with the trans in the car. The servo is kindof a bear to get to but can be done.
If you drop the pan to change anything in the valvebody, i'd just go ahead and get all new solenoids. It's probably not neccessary but at $10 a piece, it's just nice insurance for me.
ps im incredibly jealous that you said you did 245 (153mph) for 12 minutes like it was no big deal. I wish I could do that here in the states!
See back to post #3 from mrvedit. He explains a couple mods and how they work. Essientially they hold the clutch packs tighter so there is less chance for slippage.
The servo is on the side of the case and the other mods are to the valvebody. Both should be able to be completed with the trans in the car. The servo is kindof a bear to get to but can be done.
If you drop the pan to change anything in the valvebody, i'd just go ahead and get all new solenoids. It's probably not neccessary but at $10 a piece, it's just nice insurance for me.
ps im incredibly jealous that you said you did 245 (153mph) for 12 minutes like it was no big deal.
I wish I could do that here in the states!LS1 Tech Stories
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