LSD diff + automatic transmission? (1 Viewer)

[Agis4x4]

Hello everybody, i would like to know if is possible to use a LSD diff from kzj77 on kzj78 automatic transmission? Thanks

 

[CharlesHS]

Assuming its the same version differential and there isn't too much of a distance in gear ratios; there shouldn't be a problem.

 

[Agis4x4]

Thanks for the reply CharlesHS. Yes is the same size 8" and the ratio is the same (in front and back), well I changed the crown and the pinion between each other, i mean, my kzj77 has a ratio 4:56 LSD, and my automatic transmission kzj78 has a ratio 4:30 without lsd. I have been checking other lj/kzj78 but i haven't found any being automatic transmission with lsd, why it's like this? I'm thinking that maybe the torque converter can be damaged with LSD differential but i don't know really.

 

[Waikato Willy]

mate you would be hard pressed to stuff the trans from the LSD, just fitted mine a couple of weeks ago , straight out of a hilux that had a busted crown and pinion, just swapped the good crown onto the LSD centre, I didnt even set up the backlash just left it how it was and its mint, lots of heavy towing and no issues, the friction plates are as weak as a crappy cone style LSD but some "Redline Heavy Shock" shock proof gearbox oil (the red stuff) sorts it out a little better,
but still pretty hopeless, tried doing skids and doughnuts in the dry and it was a one tyre fire, little better with the water hose out , but only really good on the grass so could really do with a heavier spring inside the clutch packs I reckon

should add mines a 1KZTE auto

 

[CharlesHS]

Thanks for the reply CharlesHS. Yes is the same size 8" and the ratio is the same (in front and back), well I changed the crown and the pinion between each other, i mean, my kzj77 has a ratio 4:56 LSD, and my automatic transmission kzj78 has a ratio 4:30 without lsd. I have been checking other lj/kzj78 but i haven't found any being automatic transmission with lsd, why it's like this? I'm thinking that maybe the torque converter can be damaged with LSD differential but i don't know really.

Most factory LSD units are light duty at best and the clutch packs cease to engage after 30,000 miles.
The Eaton "Detroit" TruTrac gear driven LSD is a great traction device.
I had one in my Jeep Cherokee for quite a few years and it operated flawlessly.
Performance is good in sand, dirt, snow and in moderate amounts of mud.
I even rock crawled with it numerous times...
You just need to lightly press the brake pedal while moving to get it to engage.

 

[Agis4x4]

Thanks for the both replies. Well my kzj78 (left hand drive) has in front and back, the Toyota original elocker without lsd and my kzj77 only lsd back. The 77 has 340.000km and the LSD is still working fine, is very funny on snow, I will see those Detroit. But i would like to know why Toyota only mounted the LSD with manual gearbox.

 

[CharlesHS]

Thanks for the both replies. Well my kzj78 (left hand drive) has in front and back, the Toyota original elocker without lsd and my kzj77 only lsd back. The 77 has 340.000km and the LSD is still working fine, is very funny on snow, I will see those Detroit. But i would like to know why Toyota only mounted the LSD with manual gearbox.

The Limited Slip traction device has better road manners than a locker in snow and on ice...
Interesting that your LSD is acting funny in snow.
I doubt there is a specific reason why the automatic came with the LSD other than it was an option....

 

[Agis4x4]

Thanks for your help, i'm thinking that you are right, maybe it was only a option. Regards