chapel gate
GOLD Star
i tow 3.5 metric tonnes often in mine. over 4 tonnes in low box. although one of the reasons i chose a manual is that i thought it would be a better towing machine..
HDJ81 Towing Underwhelming... (1 Viewer)
- Thread starter BC Boy
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Are you towing with the transmission in "D" or "3"?
If you're not in "D" the TC is not locked at any speed, causing lots of heat.
If you're not in "D" the TC is not locked at any speed, causing lots of heat.
- Thread starter
- #23
Really? I switch between gears a bit...maybe this is it? If you are driving in D, then switch to 3 say at 90kph...this will unlock it?
Yes, unless you have the extreme valvebody upgrade that allows the tc to be locked in 3rd as well.
I understand you will need to shift to 3rd(or 2nd) for steep passes, other than that try to keep it in D and above 65ish km/h, this is when the tc is locked and it will run cooler.
I have a tranny temp guage, so its preety easy to tell whats going on in there. You'd be surprised how quick the temps climb when pushing hard in 3rd!
However, I do not have an aux cooler yet. Good luck and be careful with those temps! $$$$ to fix!
I understand you will need to shift to 3rd(or 2nd) for steep passes, other than that try to keep it in D and above 65ish km/h, this is when the tc is locked and it will run cooler.
I have a tranny temp guage, so its preety easy to tell whats going on in there. You'd be surprised how quick the temps climb when pushing hard in 3rd!
However, I do not have an aux cooler yet. Good luck and be careful with those temps! $$$$ to fix!
btw, my post refers to the hydraulically controlled A442. I have an 81 as well, hope you're liking it otherwise.
Tapage
Club 4X4 Panamá
In my knowledge over 80km/h the TC it's locked .. that's in my case in 3rd ( no OD ) so it means to me around 2200 rpm .. I just keep that ini mind when I switch to OD .. keep the rpm over that line .. to keep the TC locked ..
Anycase my tranny temps in city driving are from 130°F to 160°F AC off .. if I go to AC on usually I'm on 160°F to 190°F range .. ( I'm running 315 stock gears )
In the HW keeping 100 - 120km/h im ( AC off ) on the 190°F range .. if I go with AC my tranny more to 200 - 220°F range ... combines flat an few little hills .. ( nothing really importante ).
If I need to get a step hill I swith to OD off inmediatelly and if is necesary to 2nd ..
Tapage, do you have an OD button on the shifter? Our 90-92 jdm's do not. I believe they changed to electronically controlled in late 92, so they may have an OD button... not sure though, never seen one.
My '93 JDM HDJ81 has an OD button, my buddy's 91 does not.
I really didn't know that! You learn something new everyday.
I really didn't know that! You learn something new everyday.
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Thanks for clearing that up! Makes sense now.
Tapage
Club 4X4 Panamá
Thanks Tapage, that's what I thought you were speaking of. So is it the ECT that allows the TC to be locked in 3rd above 80km/h as you referred to earlier?
Can someone confirm the TC is not locked in "3" at any speed on the fully hydraulic transmission. I'm sure I have read that elsewhere, just want to make sure I'm not passing bad info...
Thanks
Can someone confirm the TC is not locked in "3" at any speed on the fully hydraulic transmission. I'm sure I have read that elsewhere, just want to make sure I'm not passing bad info...
Thanks
asutherland
VA7 HDT
Old post but thought I could add some facts. I have a HDJ81 built in 1992, September (09 month)
I have the A442 transmission - electronically controlled via solenoids (4 of them) inside the trans pan. The solenoids, using a binary (on/off) system, control 1st, 2nd, 3rd and 4th (OD) gears, as well as shift timing and lockup. Lockup only happens in 4th gear around 60-70 KM/hour. The OD button is on my shifter.
I too have had the A/T TEMP light come on during some mountain passes, with the stock trans cooler setup. I quickly had a reputable shop put in an aftermarket trans cooler, and still receive the AT temp light warning a couple times, but truthfully I should have been in 4-low for what I was doing instead of 4-high.
With my (92 build month 09) HDJ81 I also get some other goodies that 92 and below don't have, such as larger disc brakes, bigger rims (16 inch), 3rd break light, Cruise control, oil level sensor and ABS.
Funny fact, Tapage, you have a Rear Cool button... in that space I have a Rear Heat button!
I have the A442 transmission - electronically controlled via solenoids (4 of them) inside the trans pan. The solenoids, using a binary (on/off) system, control 1st, 2nd, 3rd and 4th (OD) gears, as well as shift timing and lockup. Lockup only happens in 4th gear around 60-70 KM/hour. The OD button is on my shifter.
I too have had the A/T TEMP light come on during some mountain passes, with the stock trans cooler setup. I quickly had a reputable shop put in an aftermarket trans cooler, and still receive the AT temp light warning a couple times, but truthfully I should have been in 4-low for what I was doing instead of 4-high.
With my (92 build month 09) HDJ81 I also get some other goodies that 92 and below don't have, such as larger disc brakes, bigger rims (16 inch), 3rd break light, Cruise control, oil level sensor and ABS.
Funny fact, Tapage, you have a Rear Cool button... in that space I have a Rear Heat button!
