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Old 06-05-2011, 01:22 PM   #1
slipmag
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Exclamation 4l60E with no third gear

trans came in with a slipping torque converter and pump bushing and tailshaft bushing worn.also found the 1-2 accumulator cracked with a broken spring. so i went through the entire trans to clean it out. replaced the normal seals, screens, clutches, steels, and band. seperated pump and cleaned along with the valve body.

now it has no third gear....shifts and is like neutral. no third.

have went through gm diag, all they suggest is the orifice cup plug in the input drum. i didnt even think of checking it while the unit was apart. is it possible that this came out during the rebuild or blew out after the rebuild???

so does anyone have any suggestions before i pull the unit back out....dont wanna do that if i don't have to.

also looking for a fluid flow chart if anyone has one...i have a range reference chart.... just need one that shows the fluid circuits.


as always any help or suggestions is appreciated. THANKS!!!
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Old 06-05-2011, 02:35 PM   #2
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Default Re: 4l60E with no third gear

i guess i need to stop delaying the inevitable..... going back to the shop to pull the trans out....

still looking for info on this issue if anyone has any...
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Old 06-05-2011, 03:05 PM   #3
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Default Re: 4l60E with no third gear

burnt 3/4 clutch pack..........
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Old 06-05-2011, 03:25 PM   #4
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Default Re: 4l60E with no third gear

Nah....4th gear is good. Only third. Shifted it with my laptop on the rack. Slighty held the brakes to put a load on it. Not to mention I just rebuilt it. So that rules out the clutch pack. ... thanks though.
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Old 06-06-2011, 07:20 PM   #5
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Default Re: 4l60E with no third gear

any other recommendations??
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Old 06-07-2011, 12:08 AM   #6
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Default Re: 4l60E with no third gear

Sorry to say this but its impossible to have 4th gear if you do not have third gear. The 3rd clutch circuit is used in 4th gear. The 2-4 band coming back on is what makes OD work while the 3-4 pack is applied.
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Old 06-07-2011, 07:16 AM   #7
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Default Re: 4l60E with no third gear

what about a leaking 3rd accumulator...? looks like it may have been leaking...seal is split...??
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Old 06-07-2011, 11:13 AM   #8
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Default Re: 4l60E with no third gear

Sprag in backwards?
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Old 06-07-2011, 11:15 AM   #9
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Default Re: 4l60E with no third gear

Did you take the sprag apart and assem. it backwards? Seen it happen.
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Old 06-07-2011, 12:49 PM   #10
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Default Re: 4l60E with no third gear

No...just checked it...was working fine...which sprag are you talking about?
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Old 06-07-2011, 01:54 PM   #11
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Default Re: 4l60E with no third gear

The one inside the aluminum drum. If its backwards you wont have 3rd or 4th.
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Old 06-07-2011, 02:01 PM   #12
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Default Re: 4l60E with no third gear

nah...didnt even take it apart...stayed together all in one unit. just pulled the sprag out as an assembly.
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Old 06-07-2011, 02:29 PM   #13
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Default Re: 4l60E with no third gear

http://www.scribd.com/doc/34145767/4L60E

Good reference material
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Old 06-09-2011, 01:28 PM   #14
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Default Re: 4l60E with no third gear

good material thanks bro. fixed the seal on the 3rd accumulator and replaced the 3/4 clutch pack. air checked everything....seems to be good now. customer picked it up. thanks guys for the help.
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