Official Crawlbox BS thread!

Yeah I knew going into it I was going to have to source a few parts that were probably missing.

 

I have both a 23 spline female to female and an extension housing for an auto for a marlin/inchworm setup. I don't know if they are the same for that case, but I think it's reasonably possible they would be. PM your address I'll ship them to you.

My concern was the adapter plate. I wasn't aware they made one for the second gens but it looks like they do for an auto. So maybe not so bad news...

 

Yeah it came with the adapter plate one of the pics is of that. I just trolled the seller I got this from he purchased it back over 4 years ago tried selling back then and couldn't. It is a verso with 2.28 is in the rear and 4.7 is in the front according to his original FS thread. That gearing sounds better than where he put the shift knobs. Is the verso a decent case to use?

 

I can't speak to this specific case quality personally or even anecdotally, so I'll let others chime in on that, but it sounds like you got a killer setup.

 

Verse was a copy of the original Inchworm Tacoma lefty. TG just named it Verso. Not sure why would the dude before you built a case backward. Never run a 4.7 front case in front, especially if both cases are gear driven. Only time you do that is if your running a chain rear 'taco/4runner/fj'. Positive side is both cases are gear driven not chain nor electric.
Yes the coupler is need for the transmission if your a Tacoma or 4runner/fjc

 

the chain case on the newer Tacoma’s is stronger than the older gear driven cases. The limitation of stock gearing is still there though of course. But yes I agree if two gear cases than the rear case should be the lower of the gearing between the two.

 

Hmmmmmm

 

2.28 gear + 4.7 gear tradition setup (my crawler)

4.7 gear + 2.56 chain case newer setup. Weaken the front input shaft but haven't seen anyone broken one yet.

 

The real question is the verso case strong enough to not be the constant weak link

 

Agreed, hell Wyatt's been running this setup from the beginning on his rig with 40s and dana 60s. Have yet to see a case of a 23 spline input shaft on a tacoma/FJ/4runner chain case yet, but there's always those that like the skinny pedal. That and the stock tacoma doesn't make a whole lot of HP, I'd bet if someone did a V8 swap you'd be seeing one snap. It's all about how you use the setup too. If you need enough revving and skinny pedal, you probably don't need the 4.7s on the front case, you can probably get through whatever obstacle on the stock chain case low range. I had my truck on 36s dual locked in double low, bound up the front wheel and the front ADD tube broke first.

 

If you notice BigMike nor Marlin are skinny pedaling. Crawling is what the duals are for.

 

Right in compound I get that but just in one of the L ranges wonder if it would take the abuse of some throttle and a little beating. Lots of skinny pedal in compound low just seems silly revving to the moon and not going very fast.

I've been doing some more research on it. It does have the 2.28 in the front and the 4.7 in the rear. It seems to be the TG version of the "Lefty" that Inchworm use to make. It's clocked a little higher. It seems to be about comparable to stock case as far as strength goes?!?!??? Once I get a little more organized and finish up a few other things I'm going to give TG a call and ask a bunch of Qs. Their advertising claims increased strength over the chain case

 

I've only been loosely following this thread, but I had an Inchworm 2.28 setup with a stock chain case setup on an 02 Tundra (4.7 V8), and had two failures within a year. The first was the stock cause input getting stripped (fretting caused this as they say) which obviously caused the gear case output to strip and crack as well. 6 months after that was repaired/replaced, the low range gear in the gear drive case imploded. After these two events, I went back to just running a stock case and never looked back. This is why when I got my Tacoma and started building it, I went straight to Atlas.

Though this was in a V8, I was never in the pedal all that much unless I really needed to be. The inside of the cases look disgusting, but that was from the "rust" from the fretting. The gear lube itself that was drained out was clean (aside from metal shavings).

 

This is my biggest fear with the dual setups...the possibility of fretting and stripping does have me a little nervous as I did not use anti-seize. Found that little tidbit out after it was installed. If that lets go on the trail, you ain't go nowhere, fast. Needless to say I'm not too gung-ho about pulling it all out just to check.

Learning a lot in this thread this week!

 

Reason why they said stronger is gear driven stronger over chain due to chain stretch ect.

I don't doubt you due to having a v8 yes that a ton of power from the v8. But remember the 2.28 ws not meant for that v8. Sure the 4.7 23 would of been better forsure. Lower range reduce the stress out abit

 

huh? the 4.7 gear wasn't meant for the V8 either. Is the 4.7 gear stronger because of better metallurgy/machining (especially the chromoly version), sure... but with that in front of the stock chain case, you are doubling the amount of torque that the input shaft sees on the factory stock chain case. I wouldn't be surprise if mine failed earlier if it were a 4.7 gear instead of the 2.28.

 

the fretting is more to do with machining tolerances than lack of anti seize on the splines. I’ve never heard of any fretting on a cv axle, side gear, differential flanges. Only cheaply made dual case adapters

 

Same thing happened on my crawl box build back in 2008, I remember Allen wyatt and some other TTORA members figureing out what that happens. Turns out it happened on the early crawl boxes on mini trucks as well.

I didnt feel so bad when I found out some jet engines have frettibg problem when I sat across from some engineers when I was working at an airline.

If/when my lefty and crawl box combo blows up, it will be atlas time!