Thread: TC lock up in 3rd? TD 5

if you select 3rd, it will lock at 70kph.
When towing something heavy it can go into 3rd lockup itself when in drive (4th)

Thanks RoverV8, I take it then that in 4 it does not lock when in 3rd gear?

Thanks again

Mike

if you are in drive Towing, 3rd lockup, it will change up to 4th & then in 4th lockup when the cars revs/speed are at the right condition.

If you have selected 3rd and in lockup, then shift to 4th by the gear selector it will do the same, it will go into 4th & then 4th lockup

(selected) 3rd lockup will hold right down to 50kph as long as you have the foot on the accelerator

I'm still not convinced that you get lockup in third when in drive, I have never experienced it. What feels like lockup may not be because when you take your foot off the revs drop correspondingly.

The shift pattern RoverV8 describes is the one that I see as well.

Cheers

Steve

Originally Posted by Pippin

I'm still not convinced that you get lockup in third when in drive, I have never experienced it. What feels like lockup may not be because when you take your foot off the revs drop correspondingly.

Try towing something heavy like a caravan, the TC definitely locks in 3rd whilst in Drive, again in comes down to conditions for it to do it, weight (drag), speed/incline.
It's all computer controlled and responds to different parameters

Definitely locks up 3rd when the stick is at 3 and speed is over 70. I almost always pull the stick from D to 3 before I get into a 60 zone (from an 80 or 100 zone) so the TC has time to lockup in 3rd and then I slow down to 60 with the gearbox locked in 3rd. Pulls away from the 60 zone much better when the limit changes up if the TC is locked too ... 80-85 locked in 3rd then push the stick to D, hold for a few sec's in 4th unlocked, TC locks up, and accelerate away again with a locked TC.

As far as lockup in 3rd when the stick is at D ... it does that too. With cruise ON at say 90-95kmhr in D locked, approach a big hill, cruise gasses on (aggresivley), can't hold the speed uphill so unlocks 4th, revs it's tits off, can't hold the set speed, drops to 3rd unlocked .... revs its tits and bollocks off, then locks up in 3rd ... unless it's a REALLY BIG hill, pulls up over the hill, shifts to 4th unlocked (which always seems to be around the same revs as 3rd locked at the time it upshifts), holds 4th unlocked for a bit, then locks up 4th ..... it's busy busy at around 3200-3500rpm when doing this.

Normally, I'd just pull it back to 3rd before the hill (anticipation is everything), let it lockup, and then do the hill in 3rd locked without all the automated cog swapping !

The engine's happier and your EGTs will be way lower if you let the engine rev instead of labouring. I don't have an EGT but the nanocom shows the coolant temp drops 2-3 degree's when running 3rd locked instead of 4th locked at the same road speed. Climbing hills in 4th locked the coolant temp can climb 5-8 degrees ... same hills in 3rd locked the coolant temp stays around the same, maybe a degree or so cooler/hotter than the standard on the flat temp (88deg).

YMMV

I was towing a Bobcat I hired from Kennards Hire along the highway. It was much heavier than I anticipated.

It definitely locks up in 3rd. As Fluids described the auto can't make up its mind. I found it frustrating and ended up changing back to 3rd on the hills.

I'm going to find out how the auto goes 4WDing this weekend. Does it lock up in 1st or 2nd gear in low range?