80 vs. 100 series TCases - Flat towing question

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medtro said:
Can't speak for all 80 and 100 but all the 80 and 100 that I have seen has "N" on their shifter knob.
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I think they do, just being a dumb arse/
 
So I got to looking last night at the FSM to better understand the TC's in the 80's at least. The yellow highlight shows the input shaft path from the transmission. You can see that it drives the idler gear which in conjunction with the center differential assembly are moved by the shift fork (red circle) to engage H, N or L range. The idler shaft is also what connects to the oil pump that resides in the rear extension housing. With the TC in N, and the engine off, that idler gear set is not being driven, but the center differential and of course the viscous coupler is being driven by the prop shafts.

Without seeing one of these apart, and where the oil passages go, I'm guessing that the separator in the second image is almost like an open oil pan to keep the VC in an bath to aid in cooling when the front and rear shafts are rotating at different speeds.


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80 and 100 t-case the same. They both have oil pumps systems that pump anytime the vehicle moves making both 80's and 100's safe to tow. In other words the same thing happens inside the tcase being driven or towed just less stress when towed due to being in net. I have a part time kit for a 100 series sitting in front of me and its exactly like an 80 series along with the instruction noting the same for both models by the manufacture.
 
While I hate to contradict the LCP (Land Cruiser equivalent of "The Dude") that pump is only driven when the transmission output or TC input shaft is turning. If you leave the TC in H or L, then yes, the pump would be driven but the tranny would not be happy. In neutral, it would be idle.

Unless I'm missing something, which I'm pretty sure I'm not, so the Dude must Abide.

And for those that don't get the reference, watch The Big Lebowski. :grinpimp:
 
Well, I stand corrected then good sir!

So, there is absolutely no reason that you can't flat tow these puppies other than the fact they are a bit on the portly side for a TOAD.

LCP, was that TC used throughout the 100 series production run, or did it change after '03 when the 5 speed went in? And what exactly is the pump feeding? Is the oil going to bearings or is it cooling the VC?
 
oilbrnr said:
Well, I stand corrected then good sir!

So, there is absolutely no reason that you can't flat tow these puppies other than the fact they are a bit on the portly side for a TOAD.

LCP, was that TC used throughout the 100 series production run, or did it change after '03 when the 5 speed went in? And what exactly is the pump feeding? Is the oil going to bearings or is it cooling the VC?
Click to expand...

I tired to post an oiling drawing but I cant figure out how to post out of a PDF. Its a work of art, pump feeds the center of the main shaft and is distributed out of oil galleys similar to the an engine supplies oil. Disassembling the the tcase gives you a good understand on how well it is designed and advanced it is. Most cases I have an old style sling system making low oil levels critical not Toyota as long as some gets to the pump you are good.

My '06 uses the same spool as an 80 series for the part time kit. Everything I have seen makes me believe its the same. I will soon be tearing into my '06 to finalize the part time kit and if I see anything new I will post up.

The VC is only used in a few years it can be removed and work without it is my understanding.
 
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