Crawler gears in a 3rd gen?

Gerdo · 11-30-2008, 11:55 AM

I starting to think about a set of crawler gears for my 3rd gen 4runner. I would like to keep my stock transfer case and swap the low range for something like a 4:1. Has anyone done this? Do the gears exist? I don't want to do a doubler because: of cost of driveshafts, cutting the trans tunnel.

I've looked at Marlin and Inchworm websites but it looks like everything is for 2nd gens. What are my options?

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AxleIke · 11-30-2008, 01:14 PM

Quote:

Originally Posted by Gerdo

I starting to think about a set of crawler gears for my 3rd gen 4runner. I would like to keep my stock transfer case and swap the low range for something like a 4:1. Has anyone done this? Do the gears exist? I don't want to do a doubler because: of cost of driveshafts, cutting the trans tunnel.

I've looked at Marlin and Inchworm websites but it looks like everything is for 2nd gens. What are my options?

You cannot gear a third gen stock case. Its a chaindrive unit.

You need a lefty transfercase. Its an early gear drive case modified to be driver drop.

http://www.inchwormgear.com/store/pr...5c23ed0f4f6000

crolison · 11-30-2008, 02:55 PM

like stated its either lefty or duals

Gerdo · 11-30-2008, 04:09 PM

It sounds like the Lefty can't be shifted, 2 Hi to 4 Hi, while moving. Not good.

**DeathCougar** · 11-30-2008, 04:21 PM

That would be because its a REAL tcase, some some mamby pamby chain drive.

No, it cannot be shifted from 2hi to 4hi over 5mph. The toyota gear driven cases are not syncro'd, so as to retain strength.

AxleIke · 11-30-2008, 04:27 PM

Not sure about the lefty. I have dual cases with 4.7 in the rear case, all gear drive, so I suppose I have real t-cases. I've shifted mine from 4hi to 2hi and from 2hi to 4hi at speeds up to 55mph many, many times.

Not sure why the lefty doesn't work the same way since it is essentially the same thing, with a different casing.

**DeathCougar** · 11-30-2008, 04:36 PM

You have shifted from 2Hi to 4Hi? And you are sure you have gear drive cases? I have always experienced that the top shift gear drive can't be shifted from 2wd to 4wd when you are moving. I CAN however shift from 4wd to 2wd no problem at any speed.

AxleIke · 11-30-2008, 10:47 PM

I am 100% positive I have gear drive cases. I did my 4.7's myself. Lots of gears, no chains.

I can shift from 2hi to 4hi at any speed.

Maybe we are discussing different procedures?

I will detail my procedure with an example. I live in CO, so, if I'm going to take a drive to, say, the mountains, where snow is possible, I do the following: Go out to my truck, lock the hubs, get in the truck, drive to the mountains, if its snowy, I let off the gas so the truck is coasting, and pull the 4wd lever back into 4wd.

The turbo truck will also do this with no problem. The 4runner is top shift, turbo is forward, both gear drive cases.

The only possible way I can figure that this doesn't work for you is if you are referring to having the hubs unlocked. The chain drive cases have syncros so the ADD crap works. The transfer case speeds up the driveline, and therefore the diff, and then the vacuum stuff actuates, and the collar slides over and engages the front end. Gear drive trucks have to have the hubs locked. If you are driving straight, and the front wheels are spinning at the same speed as your rears, it should pop into 4wd no issue.

The op just has to hack the add system so that it can be engaged manually when he is stopped, much like I lock my hubs. Then, if 4wd is needed out of the lefty, it will go in at any speed.

**DeathCougar** · 12-01-2008, 07:08 AM

Hmm, that may be where the difference is Ike. I guess next time i will give it a try, and make sure the hubs are locked in.

Ian Rogers · 12-01-2008, 07:17 AM

locking the hubs is thee difference once the hubs are locked the front drive shaft will be spinning. This will eliminate the need to syncros. I change my FJ40 (gear t-case) in and out of 2h 4h and in and out of 2l and 4L at any speed the fj40 can reach.

AxleIke · 12-01-2008, 08:30 AM

Quote:

Originally Posted by DeathCougar

Hmm, that may be where the difference is Ike. I guess next time i will give it a try, and make sure the hubs are locked in.

Wasn't trying to be a dick. Just saying what works for me.

I realized that you might be referring to the fact that Gerdo has ADD, and without a syncro case, would have issues shifting on the fly, since his driveshaft won't be spinning. Same as a manual hub truck with out the hubs locked in.

Anyway, apologies if it came across snide. Wasn't my intention.

ScottyC · 12-01-2008, 08:40 AM

Quote:

Originally Posted by Gerdo

It sounds like the Lefty can't be shifted, 2 Hi to 4 Hi, while moving. Not good.

That is the cost of getting a stronger, more reliable Tcase. Gear driven cases are strong, and don't have a chain that can stretch and fail.

AxleIke · 12-01-2008, 09:07 AM

Quote:

Originally Posted by ScottyC

That is the cost of getting a stronger, more reliable Tcase. Gear driven cases are strong, and don't have a chain that can stretch and fail.

If he hacks the add, he'll be able to. So, no real cost, except that you have to shift the add while stopped, same as a manual hub truck has to lock the hubs.

**DeathCougar** · 12-01-2008, 09:14 AM

Quote:

Originally Posted by AxleIke

Wasn't trying to be a dick. Just saying what works for me.

I realized that you might be referring to the fact that Gerdo has ADD, and without a syncro case, would have issues shifting on the fly, since his driveshaft won't be spinning. Same as a manual hub truck with out the hubs locked in.

Anyway, apologies if it came across snide. Wasn't my intention.

Lol nonono i didn't think you were at all! I was just saying I don't think i have ever tried it hubs locked in. Or maybe I have something worn or broken in my case, who knows.

Its all good man!

11-30-2008, 02:55 PM	#3 (permalink)
crolison Registered User Join Date: Mar 2007 Location: knoxville, tn Posts: 2,279	like stated its either lefty or duals __________________ 97 4runner, 2.7 5speed 4wd, 5.29, 33 horns armor locked lifted heavy SOB broken front and rear swaybars My Profile..

11-30-2008, 04:09 PM	#4 (permalink)
Gerdo Registered User Join Date: Nov 2005 Location: SouthWest Littleton, Colorado Posts: 842	It sounds like the Lefty can't be shifted, 2 Hi to 4 Hi, while moving. Not good. __________________ 2000 4Runner Sport, 3.4L, 5 Speed, Custom Front Winch Bumper, Opened intake, K&N Airfilter, BFG A/T LT265/70R16, Bilstein Shocks, FreeFlow Exhaust, Poly Rack Mounts & Swaybar Mounts, Tundra TRDs up front and OME 891s out back. ToyTec Panhard Bar Drop. SS Front Diff Drop. Home-built 2x2 Sliders. ARB rear locker, OBA, CO2 See My 4Runner!

11-30-2008, 04:27 PM	#6 (permalink)
AxleIke Contributing Member Join Date: Apr 2004 Location: Boulder, Colorado Posts: 4,887	Not sure about the lefty. I have dual cases with 4.7 in the rear case, all gear drive, so I suppose I have real t-cases. I've shifted mine from 4hi to 2hi and from 2hi to 4hi at speeds up to 55mph many, many times. Not sure why the lefty doesn't work the same way since it is essentially the same thing, with a different casing. __________________ 1987 Mutant 4runner\|Slightly Modified\|Lacking general build direction -Lifts and Tires look cool at the Mall, Lockers and Gears look cool on the trail. -Internet Nice Guy Last edited by AxleIke; 11-30-2008 at 04:29 PM.

11-30-2008, 10:47 PM	#8 (permalink)
AxleIke Contributing Member Join Date: Apr 2004 Location: Boulder, Colorado Posts: 4,887	I am 100% positive I have gear drive cases. I did my 4.7's myself. Lots of gears, no chains. I can shift from 2hi to 4hi at any speed. Maybe we are discussing different procedures? I will detail my procedure with an example. I live in CO, so, if I'm going to take a drive to, say, the mountains, where snow is possible, I do the following: Go out to my truck, lock the hubs, get in the truck, drive to the mountains, if its snowy, I let off the gas so the truck is coasting, and pull the 4wd lever back into 4wd. The turbo truck will also do this with no problem. The 4runner is top shift, turbo is forward, both gear drive cases. The only possible way I can figure that this doesn't work for you is if you are referring to having the hubs unlocked. The chain drive cases have syncros so the ADD crap works. The transfer case speeds up the driveline, and therefore the diff, and then the vacuum stuff actuates, and the collar slides over and engages the front end. Gear drive trucks have to have the hubs locked. If you are driving straight, and the front wheels are spinning at the same speed as your rears, it should pop into 4wd no issue. The op just has to hack the add system so that it can be engaged manually when he is stopped, much like I lock my hubs. Then, if 4wd is needed out of the lefty, it will go in at any speed. __________________ 1987 Mutant 4runner\|Slightly Modified\|Lacking general build direction -Lifts and Tires look cool at the Mall, Lockers and Gears look cool on the trail. -Internet Nice Guy Last edited by AxleIke; 11-30-2008 at 10:58 PM.

12-01-2008, 07:17 AM	#10 (permalink)
Ian Rogers Registered User Join Date: Apr 2007 Location: Whittier, Ca Posts: 209	locking the hubs is thee difference once the hubs are locked the front drive shaft will be spinning. This will eliminate the need to syncros. I change my FJ40 (gear t-case) in and out of 2h 4h and in and out of 2l and 4L at any speed the fj40 can reach. __________________ 69' FJ40 "RUSTY" H41,3 speed case, ARB Lockers F/R, 34x9.5 TSL's, Co2, Warn 5687, 2.5 " Parabolic lift, Pertronix Ingitor, 4+ U bolt flip kit, 20 gal. Aux Tank 2000 4-Runner SR5, V6, 5 speed, Highlander edition, S/C, URD 7th, DP TLCA #14752, L.A. Trail Crew Phi Kappa Psi http://www.marksoffroad.net My Parts Source

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