Have been searching the archives and seen quite a few threads about the fast road auto box rebuild a la Mac1. Could anyone answer a couple of questions?

 

1/ On the subject of changedowns.. when slowing down for a junction, my box stays in the highest gear it can unless the car sops moving. Should the box on a Zed change down gears as it slows as I`ve experienced in other auto cars ?

 

2/ When accelerating in a sensible fashion:) and the car locks in on third, engaging the overdrive while still on the hot pedal makes the revs increase as the box comes out of lock and into 4th. This wouldn`t be so bad except that revs shoot up by more than they drop when the box locks a gear in. Is this normal?

 

 

Apologies if I`m being stupid here....I`ve looked through the archives quite a bit but can`t seem to find an answer there.

Needs looking at, SOON, sometimes, an auto can be saved or its life extended by early attention. sounds like it might be too late though.

With overdrive on (light off) the auto box gives no engine breaking - at least on mine anyway - UK. So stays in highest gear. Ive even seen mine appear to freewheel with about 30mph and the revs dropping to idle. With OD off (light on) you do get engine braking but it still doesnt change down until you stop or kick down a bit to pick up again but much more fun on the twisties.

 

Switching OD on while accelerating hard wont make it select 4th. It will stay in 3rd as long as the box ecu decides it needs to and depending on speed and throttle it will eventually change up and later then also lock up the torque converter to make revs drop again almost like selecting a 5th.

 

If you change out of locked up OD at speed then the revs pick up a lot.

 

Made me think you had OD on and off round the wrong way in 2/

 

You have to look at the speed / gear / throttle position curves in the manual to see if your change positions are out of spec.

 

Slipping and juddering or sticking in wrong gears are the bad signs - smelly dirty cloudy transmission fluid with bits of burned clutches in it also! Check your dipstick and smear it on white paper.

Originally posted by WillieO

With overdrive on (light off) the auto box gives no engine breaking - at least on mine anyway - UK. So stays in highest gear. Ive even seen mine appear to freewheel with about 30mph and the revs dropping to idle. With OD off (light on) you do get engine braking but it still doesnt change down until you stop or kick down a bit to pick up again but much more fun on the twisties.

 

Switching OD on while accelerating hard wont make it select 4th. It will stay in 3rd as long as the box ecu decides it needs to and depending on speed and throttle it will eventually change up and later then also lock up the torque converter to make revs drop again almost like selecting a 5th.

 

If you change out of locked up OD at speed then the revs pick up a lot.

 

Made me think you had OD on and off round the wrong way in 2/

 

You have to look at the speed / gear / throttle position curves in the manual to see if your change positions are out of spec.

 

Slipping and juddering or sticking in wrong gears are the bad signs - smelly dirty cloudy transmission fluid with bits of burned clutches in it also! Check your dipstick and smear it on white paper.

 

Nuff said then..appears all is well and I am being a little paranoid. Thanks for the help.

 

ps...exactly how good is the fast road rebuild and is it as smooth as the stock auto box?