Transmission

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LC200JG

LC200JG

Joined
Oct 31, 2020
Threads
4
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198
Location
Glen Allen VA
Never in a million years would I have thought that I would blow my transmission in my 200 series wheeling hard. Just installed lockers. Coming down a tough drop got stuck, bounced around a bunch of boulders. Driving home I noticed awful noises and transmission slip. I thought it my be something with my lockers or maybe even my transfer case. I have a 17,000 mile transmission for 2017 I found on car-part coming Monday so I can head off to the Red Clay Rally next week. Broke my winch cable too.

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It got you home though, correct?

N=1 here but I have to wonder whether the 6-spd would have fared better...
 
Sorry to hear of the transmission issues and sounds like you have a workable plan forward.

Curious as to your thoughts on how the transmission failed? Damage from contact underneath? Or just the stress and strain of getting through the bolder garden? If it's slipping, did you check fluid levels?
 
Oh jeez. That's not good. Those miles don't sound high at all for a transmission failure? Was the thing beat hard in a city for most of those miles? It's pretty much a sealed system so unless the tranny pan was damaged at some point and you lost fluid I am at a loss. A couple of rusted bolts on the pan and the seal broke?

Folks break weird things all the time wheeling hard. Transmissions not so much unless there was an underlying problem. Especially that transmission.

Good luck
 
TeCKis300 said:
Sorry to hear of the transmission issues and sounds like you have a workable plan forward.

Curious as to your thoughts on how the transmission failed? Damage from contact underneath? Or just the stress and strain of getting through the bolder garden? If it's slipping, did you check fluid levels?
Click to expand...
No leaking fluid. I guess just the boulder garden. With my new lockers the strain was just more than she could bear. I suppose.
 
Lester did that said:
Oh jeez. That's not good. Those miles don't sound high at all for a transmission failure? Was the thing beat hard in a city for most of those miles? It's pretty much a sealed system so unless the tranny pan was damaged at some point and you lost fluid I am at a loss. A couple of rusted bolts on the pan and the seal broke?

Folks break weird things all the time wheeling hard. Transmissions not so much unless there was an underlying problem. Especially that transmission.

Good luck
Click to expand...
That's exactly what I'm thinking. Just that the lockers allowed the strain to be much higher than normal maybe?
 
Were you in low range when wheeling? Some guys like to leave it in high range but that's harder on the transmission. I've heard all kinds of justification like "oh that's what the torque converter is for" but these folks clearly don't understand what is going on under their truck.

Adding lockers should not have caused any added stress unless you were working it really hard because of your new capability. Heat and burnt fluid kill an automatic transmission. Once the internal pressure starts to drop and the transmission starts slipping, it's all over. If you are going to wheel hard you may consider adding additional cooling, but a stock 200 should already have a good transmission cooler. Is yours full of mud?

5" of lift, what size tires? Might want to look at new gearing.

Good luck with the transmission swap?
 
bronc076 said:
Were you in low range when wheeling? Some guys like to leave it in high range but that's harder on the transmission. I've heard all kinds of justification like "oh that's what the torque converter is for" but these folks clearly don't understand what is going on under their truck.

Adding lockers should not have caused any added stress unless you were working it really hard because of your new capability. Heat and burnt fluid kill an automatic transmission. Once the internal pressure starts to drop and the transmission starts slipping, it's all over. If you are going to wheel hard you may consider adding additional cooling, but a stock 200 should already have a good transmission cooler. Is yours full of mud?

5" of lift, what size tires? Might want to look at new gearing.

Good luck with the transmission swap?
Click to expand...
Yes, low range. That's good to know. I guess I was just wheeling hard and burnt it up. No I don't see a lot of mud. 35" tires. I have the stock 2008-2015 gears I had to switch to with the lockers 3.9 I think. Thank you!
 
It would be great to have a transmission shop tear it down and diagnose. Even just draining the fluid could be enough to tell if you burnt through the clutch packs versus breaking something else internal. This way you might know if lower gears and/or an additional cooler might help.
 
bronc076 said:
Heat and burnt fluid kill an automatic transmission. Once the internal pressure starts to drop and the transmission starts slipping, it's all over. If you are going to wheel hard you may consider adding additional cooling, but a stock 200 should already have a good transmission cooler. Is yours full of mud?
Click to expand...
These trucks should go into limp mode when the transmission gets too hot, correct?
 
The 8 speed has always raised red flags in my book. When it first came out, there were reports of multiple entire replacements without explanation from Toyota.

It’s a short run of only 5 years on specific market Cruisers, and Cruisers alone - no other Toyota has it. The 6 speed was shared with the Tundra and has proven to be fully capable and the 5 speed in the 100/Tundra/4Runner is essentially bombproof.

I have never liked the way the 8 speed in my 200s drove, since day one with 6 miles on the ODO. I far prefer the 6 speed in my 14LX and 5 Speed in my 4Runner. They are SIGNIFICANTLY smoother in operation and are much more pleasant to drive.

Time will tell on the 8 speeds. It’s concerning to me to have a rotating assembly with 3 more speeds weigh less than its predecessor with less gears. Which also weighs less than the 4 speed in 80s and early 100s. The 8 speed was introduced at a time when Toyota needed to compete, on paper at least, with other manufacturers. What compromises they allowed or reduced testing may have been performed will never be known…..
 
bronc076 said:
If you are going to wheel hard you may consider adding additional cooling, but a stock 200 should already have a good transmission cooler. Is yours full of mud?
Click to expand...
The stock fluid/air has ducting around it to keep mud out.. it is a pretty well protected unit. Plus if it became clogged the fluid/fluid in the base of the radiator should help at least somewhat..
 
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