auto box lock-up operation

nicstrike · Post by **nicstrike** » Sat Apr 30, 2011 8:46 pm

i know that the auto box & all its quirks have been discussed over & over , but can anyone describe , solely , the proper & correct operation of the lock-up aspect of the auto box? i know it should kick in at around 37-40mph but other than that i am unsure how it should function & what is (or not) correct behaviour. is there a particular speed at which it should stay locked (other than in kick-down)? i am asking because on our bongo the lock-up seems to drop out & then back in if you back off the the throttle fully & then re-apply (as on twisty b road cruising etc) it was very pronounced & agressive but i have made it a little less "in your face" by tweaking the tps a touch but dont want to over-do it and mess up the change pattern too much. i would like to understand fully what it should be doing before i get too carried away with it.

francophile1947 · Post by **francophile1947** » Sat Apr 30, 2011 9:31 pm

That sounds normal to me

Mine also seems to go out of lock-up when on overrun, but re-engages as soon as you start to accelerate again.

bigdaddycain · Post by **bigdaddycain** » Sat Apr 30, 2011 10:58 pm

The lock up is noticeably less noticeable

After an ATF fluid change... might be worth considering perhaps? You'll be amazed at the difference!

nicstrike · Post by **nicstrike** » Sun May 01, 2011 10:23 am

thats being done this week , so hopefully that will do the trick!

nicstrike · Post by **nicstrike** » Mon May 02, 2011 9:38 am

just read a quote from alacrity in another "gearbox" post & it would seem that our 'box is probably working as it should , just maybe not as smoothly as it could. gear changes themselves are pretty smooth but the lock-up could be quite pronounced , though a little less so since i played with the tps.

nicstrike · Post by **nicstrike** » Thu May 05, 2011 7:31 pm

WOW.......we now have a new truck. what a difference a good service has made! atf & strainer change has really smoothed out the lock-up jolt. new drive belts mean we no longer have a demented mouse at idle , and new front arb bushes and drop links have stopped it sounding like an old cart rattling over cobbles. the old bus is driving really well now!

Post by **westonwarrior** » Thu May 05, 2011 7:38 pm

Thats good to hear

nicstrike · Post by **nicstrike** » Thu May 05, 2011 8:06 pm

dead chuffed. aparantly the atf was like soup. happy days.

Alacrity · Post by **Alacrity** » Fri May 06, 2011 11:18 am

Just seen this post as I have been away. If the ATF was 'like soup' then one oil change will not be enough, you only get out about 2/3rds of the oil when you drain it, the converter stays full. I would strongly recommend you change it again if it was that bad.

nicstrike · Post by **nicstrike** » Fri May 06, 2011 6:26 pm

cant have been far off , he got best part of 6 litres back in.

Alacrity · Post by **Alacrity** » Sun May 08, 2011 8:36 pm

I assure you if, as he says it was 'like soup' you need to double flush, you will NOT have changed more than about 2/3rds of the oil. It's your choice though but oil is cheap compared to a transmission rebuild.

nicstrike · Post by **nicstrike** » Sun May 08, 2011 9:49 pm

i'll double check with the grease monkey.

nicstrike · Post by **nicstrike** » Mon May 09, 2011 10:40 pm

grease monkey interrogated & all well.

jaylee · Post by **jaylee** » Mon May 09, 2011 10:44 pm

nicstrike wrote:grease monkey interrogated & all well.

I bet he never expected that....

Post by **Bongoplod** » Mon May 09, 2011 10:51 pm

nicstrike wrote:grease monkey interrogated & all well.

Ah,but does your greasemonkey know his Bongos??

There are plenty of Bongo owners on here who THOUGHT their greasemonkeys did when they informed they had bled their Bongo correctly......then got a bit miffed when it cost them £1500 to re...!!! place the head!!!

Brian

auto box lock-up operation

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