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Ability to "tune" up a 4R70W

lil_dq

lil_dq

Let 'er eat boys!
6,933
265
Union, MO
Rumor has it you can make an 1/8 of a turn on something inside the trans to make it shift a little harder.

Anybody heard of this?
 
d-kuzmen

d-kuzmen

Master Ford Tech
2,109
79
Connecticut
You can turn the EPC solinoid screw to increase the PSI which will give firmer shifts, never seen it done on a 4r70, just 5r55's.. But as long as the solinoid has the screw on the back it'll work.
 
lil_dq

lil_dq

Let 'er eat boys!
6,933
265
Union, MO
Where would that be located if it had one. My trans shop said it was there but didn't get into detail.
 

Brian_B

blank
6,833
84
Mountain Home, AR
d-kuzmen said:
You can turn the EPC solinoid screw to increase the PSI which will give firmer shifts, never seen it done on a 4r70, just 5r55's.. But as long as the solinoid has the screw on the back it'll work.
Click to expand...


smiliewhathesaid

People have been turning up the PSI in automatic transmissions since the 60s and maybe earlier. I had a 72 torino that would snap your neck, however it was very rough on U-joints and rear tires. :headbang:
 
lil_dq

lil_dq

Let 'er eat boys!
6,933
265
Union, MO
I don't want to turn it up too much just wanna firm them up a little.
 
lil_dq

lil_dq

Let 'er eat boys!
6,933
265
Union, MO
ok I'll take a look for it sunday
 
lil_dq

lil_dq

Let 'er eat boys!
6,933
265
Union, MO
how much should I turn it? maybe like a 1/4 turn.
 
lil_dq

lil_dq

Let 'er eat boys!
6,933
265
Union, MO
oh yeah.....counterclockwise or clockwise.
 
lil_dq

lil_dq

Let 'er eat boys!
6,933
265
Union, MO
Thanks for all the help.
 
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