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#1 |
Registered User
Join Date: Apr 2008
Location: Sacramento, CA
Posts: 201
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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. |
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#2 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,484
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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.
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Mike 1969 C10 LWB -- owned for 35 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 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! |
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#3 |
Post Whore
![]() Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,086
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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?
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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 |
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#4 |
Registered User
Join Date: Oct 2004
Location: saskatoon, planet earth
Posts: 686
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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?
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I got a bench seat baby, you don't have to sit over there. |
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