4r100 trouble

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Sep 3, 2022 | 02:20 AM

valliant75

Thread Starter

4wd High

Joined: Sep 2022

Posts: 9

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4r100 trouble

I just rebuild my 4r100 alto powerpacks and transgo tugger shift kit.
Did ewerything after the book and worked fine,oil is clean etc.
But some how its sudenly got som issues after pulling tranny back again too change flexplate.
Slow too engage reverse,must give a litle throhle,then strong in reverse no slipage,but makes a whining hydraulic noise(like safety valve blow sound)
when first in R it uses some time too relase again.can also hawe same symptoms when auto downshift from 3rd too 2cond.
These isues come and goes,sometimes works perfect sometimes like my descreption.
For me it apears like valve sticking ore electrical,but im no expert on 4r100 trans ,but im 100% the internal tranny is put together right.senter suports used loctite and moment etc,
from a dead start and full acceleration al gears hold strong.
Im living countryside in Norway so werry few specialist workshops in these country and theyr far away(4.500.000 citizen in Norway)
Im thankfully for tips too check out.
Best regards Kjetil Sollid

Sep 4, 2022 | 03:53 AM

351Cleveland C4

Lead Driver

Joined: Jul 2011

Posts: 8,678

Likes: 191

From: On the Edge of the Desert

Check the plug on the passenger side. Causes all sorts of issues if it's dirty or loose.

Sep 4, 2022 | 04:06 AM

valliant75

Thread Starter

4wd High

Joined: Sep 2022

Posts: 9

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i did and it works percectly i reverse with these disengaged

Sep 4, 2022 | 08:26 AM

AuroraGirl

Lead Driver

Joined: Jun 2021

Posts: 5,217

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Quote:

Originally Posted by valliant75

i did and it works percectly i reverse with these disengaged

I dont think he and you have the same thing in mind

Sep 4, 2022 | 09:27 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,704

Likes: 2,625

From: SE Florida

Quote:

Originally Posted by valliant75

rebuildt 4r100 troubles
slow too engage revers,must give a litle throtle.strong in r when first engage sometimes also slow too disengage from reverse.
These symptoms are gone when pulls the conector too nthe solenoid pack.

I think something is wrong inside the reverse clutch.

When you unplug the connector the pressure control solenoid goes to maximum pressure. All that additional pressure is why the problem doesn't happen with the connector removed. It isn't an electrical problem.

Sep 4, 2022 | 09:40 AM

valliant75

Thread Starter

4wd High

Joined: Sep 2022

Posts: 9

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Quote:

Originally Posted by Mark Kovalsky

It happening after pulled tranny 30 cm back too changw flexplate.if leak in clutch pack it should slip?its no slip.it also works fine again sometimes,after its hot,like 150fahrenheit.
something mechanical wrong in a clutch dont come and go,what u think of solenoids?was love ohm on them