Thread: 700r4

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after rebuild of 700r4 trans it ties-up in reverse, the 2-4 band is being applied about 5 seconds after selecter is placed in rev. any ideas?

thank you dosbevos

Here's a link http://purplesagetradingpost.com/sum...o/700R4p2.html

thanks for the link Don - is there a way to bench check the 700r4 with shop air? I did the air checks during build up, but can you bench check the trans before installation?

health&happiness - dosbevos

Originally posted by dosbevos
after rebuild of 700r4 trans it ties-up in reverse, the 2-4 band is being applied about 5 seconds after selecter is placed in rev. any ideas?

thank you dosbevos

what do you mean ties-up. it wont back up because its in 2 gears? not sure on the air check, but if the band moves under oil pressure it should move with air pressure.

Originally posted by lt1s10
what do you mean ties-up. it wont back up because its in 2 gears? not sure on the air check, but if the band moves under oil pressure it should move with air pressure.

not in 2 gears but oil press to servo is applying the 2-4 band - it's not suppost to. I have man. low but no drive - any ideas?

Originally posted by dosbevos
not in 2 gears but oil press to servo is applying the 2-4 band - it's not suppost to. I have man. low but no drive - any ideas?

sounds like you got a problem with the valve body. the only way oil gonna get to the 2-4 band is threw the valve body. did you put a shift kit in?

Originally posted by lt1s10
sounds like you got a problem with the valve body. the only way oil gonna get to the 2-4 band is threw the valve body. did you put a shift kit in?

no shift kit - stock transtar rebuild - went thru valve body, every thing seems ok - I did find the lo/rev roller clutch in backwards - I'll post what happens - my book says problems with the 700r4 are usually in pairs - thanks for the post, it keeps me thinking

dosbevos

Originally posted by dosbevos
no shift kit - stock transtar rebuild - went thru valve body, every thing seems ok - I did find the lo/rev roller clutch in backwards - I'll post what happens - my book says problems with the 700r4 are usually in pairs - thanks for the post, it keeps me thinking

dosbevos

i dont under stand, where did you get this trans? if you was driving it and then overhauled it the lo/rev roller clutch couldnt have been in backwards or it wouldnt have worked in the first place.

Originally posted by lt1s10
i dont under stand, where did you get this trans? if you was driving it and then overhauled it the lo/rev roller clutch couldnt have been in backwards or it wouldnt have worked in the first place.

I replaced the low/rev roller clutch and reaction sun shell because of damage - dosbevos - still don't understand how 2-4 band is being applied by servo when in reverse?

Originally posted by dosbevos
I replaced the low/rev roller clutch and reaction sun shell because of damage - dosbevos - still don't understand how 2-4 band is being applied by servo when in reverse?

I don't have one, but you need a serv. Manuel with the fluid diagram in it and then you could see why. don't know anybody at a GM dealership do you? maybe a check ball in the wrong place?

Originally posted by lt1s10
I don't have one, but you need a serv. Manuel with the fluid diagram in it and then you could see why. don't know anybody at a GM dealership do you? maybe a check ball in the wrong place?

I have the fluid diagrams and have double checked all check balls- I'll install trans. in car and see what it does with line pressure guage installed - thanks for your reply and I'll post back -dosbevos

Originally posted by dosbevos
I have the fluid diagrams and have double checked all check balls- I'll install trans. in car and see what it does with line pressure guage installed - thanks for your reply and I'll post back -dosbevos

thanks

the 3-4 shift valve is stic`king in the valve body replace the valve body

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