700R4-4L60 Techie Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

beanious · 11-26-2023, 12:42 PM

Hello all, I've noticed on two of my trucks that have 4L60-700R4s, that when they're in neutral and the wheels are off the ground the tires spin at about 10 miles an hour.

I'm wondering what causes this, I'm assuming it's due to either friction from rotating internals or fluid inertia transferred to the output shaft.

Also if anyone has any ideas on how to eliminate the output shaft spin in neutral and get a true neutral, that would be a huge win. I've been thinking that a 2-4 band apply when in neutral might eliminate the unwanted output shaft rotation, no clutches are applied in neutral so I don't think there would be any drive gears engaged. I have an NP205 behind one of the 4L60-700R4s and it hates input-output shaft speed variance, I've started shifting it at 10 mph as a work around but it would be nice to shift in neutral while stopped.

Thanks in advance.

**MikeB** · 11-28-2023, 07:55 PM

You might want to search for a 700R4 forum. Or go to the 700R4/4L60E Rebuilders Facebook group. As usual, you'll get some wise-ass comments with a few helpful ones thrown in.

**HO455** · 11-28-2023, 09:43 PM

Have you looked here?

http://67-72chevytrucks.com/vboard/s...d.php?t=634121

Maybe a PM to member clinebarger would get an answer to your question?

purple gas · 11-30-2023, 07:12 PM

I have a 2000 Silverado, 2 WD, automatic. When I start it, in park, not always, but often it lurches ahead until it hits the park pin ( I'm guessing) then seems to relax and roll back. I bought it with 145,00 Kilometers ( just under 100,000 miles ) on the odometer.
I wonder if it's related to the O.P's issue?

11-26-2023, 12:42 PM	#1
beanious Registered User Join Date: Apr 2008 Location: Sacramento, CA Posts: 195	700R4-4L60 Techie Question Hello all, I've noticed on two of my trucks that have 4L60-700R4s, that when they're in neutral and the wheels are off the ground the tires spin at about 10 miles an hour. I'm wondering what causes this, I'm assuming it's due to either friction from rotating internals or fluid inertia transferred to the output shaft. Also if anyone has any ideas on how to eliminate the output shaft spin in neutral and get a true neutral, that would be a huge win. I've been thinking that a 2-4 band apply when in neutral might eliminate the unwanted output shaft rotation, no clutches are applied in neutral so I don't think there would be any drive gears engaged. I have an NP205 behind one of the 4L60-700R4s and it hates input-output shaft speed variance, I've started shifting it at 10 mph as a work around but it would be nice to shift in neutral while stopped. Thanks in advance. Last edited by beanious; 11-26-2023 at 03:16 PM.

11-28-2023, 07:55 PM	#2
MikeB Senior Member Join Date: Jul 2000 Location: North Texas Posts: 3,440	Re: 700R4-4L60 Techie Question You might want to search for a 700R4 forum. Or go to the 700R4/4L60E Rebuilders Facebook group. As usual, you'll get some wise-ass comments with a few helpful ones thrown in. __________________ Mike 1969 C10 LWB -- owned for 34 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 23 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then!

11-28-2023, 09:43 PM	#3
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,903	Re: 700R4-4L60 Techie Question Have you looked here? http://67-72chevytrucks.com/vboard/s...d.php?t=634121 Maybe a PM to member clinebarger would get an answer to your question? __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

11-30-2023, 07:12 PM	#4
purple gas Registered User Join Date: Oct 2004 Location: saskatoon, planet earth Posts: 684	Re: 700R4-4L60 Techie Question I have a 2000 Silverado, 2 WD, automatic. When I start it, in park, not always, but often it lurches ahead until it hits the park pin ( I'm guessing) then seems to relax and roll back. I bought it with 145,00 Kilometers ( just under 100,000 miles ) on the odometer. I wonder if it's related to the O.P's issue? __________________ I got a bench seat baby, you don't have to sit over there.



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