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Old 10-18-2009, 01:27 PM
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3-4 accumulator 4l60e

What does the 3-4 accumulator do? I am trying to figure out why my reverse went out on my 4l60 that has 16K miles on it. During the teardown I found the 3-4 accum. piston in upside down, with the spring on top of it instead of underneath it. Was assembled piston in the case first, upside down, and then the spring on top of it.
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Old 10-18-2009, 01:33 PM
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Originally Posted by t00lmanii
What does the 3-4 accumulator do? I am trying to figure out why my reverse went out on my 4l60 that has 16K miles on it. During the teardown I found the 3-4 accum. piston in upside down, with the spring on top of it instead of underneath it. Was assembled piston in the case first, upside down, and then the spring on top of it.
Thanks.
the 3-4 accumulator is just that , it accumulates ( softens) the apply of the band in 4th gear

very common mod. Has nothing to do with reverse. It firms 4th gear up slightly

i install the 3-4 accumulator piston - spring like this in all units
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Old 10-18-2009, 03:50 PM
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Crosley....my bad....I explained the situation incorrectly. The spring was in the case bore, then the piston installed upside down on top of the spring.

:--------------:
: piston :
: ............. :
.............
.spring....
-------- --------------
L..case bore.....]

hmmmm.......that did not post the way I had it shown.......but anyway, the spring was in the case bore with the piston on top of it, upside down.
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Old 10-18-2009, 05:31 PM
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Quote:
Originally Posted by t00lmanii
Crosley....my bad....I explained the situation incorrectly. The spring was in the case bore, then the piston installed upside down on top of the spring.

:--------------:
: piston :
: ............. :
.............
.spring....
-------- --------------
L..case bore.....]

hmmmm.......that did not post the way I had it shown.......but anyway, the spring was in the case bore with the piston on top of it, upside down.

ok, I will be more clear. It does not matter which way the spring and piston are installed.... in relation to reverse working or not.

the important part is the bore is not scored up , the guide pin and matching bore in the piston are in good shape with a good rubber seal on the piston.

I would suggest you buy a video , book or similar reference material to aid you in the parts replacement of this trans



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Last edited by Crosley; 10-18-2009 at 05:56 PM. Reason: more clearity on the words, sorry
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