Topic: 700r4 crawler

[4runner]

   I'm building a 89 4runner with 38" tires and 5.29's in the rearends. I thought of putting my 327 in it. I'm concidering using a 700r4 tranny with a stock toyota tranfercase. Do you think I'll have a low enough crawl ratio for rockclimbing? I only want to build this truck once, so do you think I should run dual tranfercases?

[Thumper]

ya it would be better to have the duels u will wish u did it after u put it together if u dont.
with the auto tranny it might be allright but ur best bet would be too put in the duels or atleast some 4.7 gear sets.
a friend of myne is building a toy with 38's and a built 350 turbo 350 with duel transfer case's and 4.10 high pinions.
ill let ya know how well it does after its done.

[ezthere]

I am running a worked 4.3L carb'ed 700r4 unlocked and no granny gears, 4:10'S in the rear...This thing is quick out of the hole..Money well spent is go with the granny gears in the transfer box and 4:88 in the back and front, of course lockers.The 5:79 are too weak..I can't crawl {no fuel injection}..

And use E-BAY  

[4runner [OP]]

  I already have built axles with 5.29 gears and lockers. Do you think it will crawl slow enough. Are the 5.29s  strong enough for a V8? I thought adding a second case would be a weak link cuz it would have to run through more shafts.Would the 4.7 gearsets be stronger?

[WHITE_TRASH]

It all depends on your driving habits.  I have broken gears with a 4 cyl.  I have broken a LOT more gears with my 350 truck.  All of the gears I have broken have been 4.10's or 4.88's which to many are stronger than 5.29's.  Myself I would have no problems using 5.29's, but I would adjust my driving style.  What size tires are you running? That will make a big difference in your crawl ratio.  The 4.7's are nice but I wouldnt do them by themselves, I would go with duals that way you have low for trail cruising or mud or whatever, and you would also have a lower ratio for crawling.
WT

[4runner [OP]]

 I have 38" gumbo mudders .So you think I should run duals even with the automatic tranny?I heard the torque converter multiplys
the crawl ratio or something.I dont know the least about a automatic.All information is appriciated

[Marlin]

Running a auto makes it easier on the drivetrain (less shock load). Ditto on the dual case.
327, 700R4, 3.07 1st, dual case 2.28, 2.28, 4.88 =78:1
327, 700R4, 3.07 1st, dual case 2.28, 4.70, 4.88=161:1

327, 700R4, 3.07, 2.28, 2.28, 5.29=84:1
327, 700R4, 3.07, 2.28, 4.70, 5.29=174:1

The above ratios do not include the torque converter. Times the above ratios by 2 to get the converter crawl raito.

A auto with a crawl ratio of 50:1 or greater is impressive.This number is without the torque converter and does not allow for 38" tires!

[Thumper]

there is a guy i wheel with with a 350 carbed with 4 speed tranny,4.38 gears, 38 super swamper sx's and he crawls great he just went from 4.10s to my old 4.38's i took out of my truck when i swaped in 5.29's and he crawls much better now. so with the auto it should be fine if u dont have the $ for a crawler but if u can afford it id go with duels because u can always shift it back into high range if u want the origional low range but always have that extra stick too go even slower.

[4runner [OP]]

 thanks for the info, I think I'll get a second case. anyone tell me what RPM stall torqe convertor I should run?

[WHITE_TRASH]

I run a converter out of a 86 buick regal.  I know it sounds stupid but the cars were sorta heavy and underpowered, so they came with higher stall converters.  Mine stalls out at about 2-2200.  The more torque you put to a converter the higher it will stall.  That is why everyone used to use 8" converters out of vegas in drag cars.  The vega had a 4 cyl.  so it had a higher stall put that same setup behind a healthy V8 and your talking about a 4-5k stall speed!!
Hope this helps ya out.
WT

[freds40]

You're talking about crawling so I'd say stay with the stock convertor in the tranny. If it's from a truck, it will stall about 1000-1200 which is just fine.

[ezthere]

Oh by the way unless you're engine in fuel injected.You wont be crawling over rocks.My carb'ed V6 can not handle drive lines beyond 45deg...

[4runner [OP]]

Being I'm putting chevy horsepower under the hood ,do you think the 203 to 205 doubler would be stonger than the toyota dual case setup ?

[WHITE_TRASH]

Lemme put it this way I have broken EVERYTHING but my transfercase.  Depending on the way ya wheel it would probobly survive nicely.  Especially if you used 23 spline inputs.
WT

[4runner [OP]]

I was thinking it might be easier to hook the 700r to a 203 transfercase and a 205 ,or maybe 203 to a landcruser case. Do you think either of these setups would be easier,better or cheaper to build. I do want to build it strong the first time around. I really appreiciate all the help and advise . Not many people local in my area to get advise from and you know what your talking about. I thank you.

[WHITE_TRASH]

If you dont have a hammer down driving style Id stick with the yota case.  The last time I looked the 203/205 adapter was about $600.  Where as a Mco7 is $450 and all of the drivelines will bolt up after being shortened/lengthened etc.  If you really want to use the GM cases, more power to ya for being stronger.  This setup will be a bit harder to install, the shifters will need some serious modifications.  But look on the bright side, it would give you the front drive only option.  
WT

[Thumper]

well it might be cheaper in the long run too go with the 203 too 205 transfer cases. If a 203 will bolt right up too a 700r4 (IS THAT POSSIBLE WITHOUT ADAPTER)then he will only need the one adapter too go from 203 too 205 but with toyota stuff he will be out the 500 too 600 bucks for the adapter too go from auto too toyota case then another 450 too go too the 2nd case so eather way its gonna be about the same.
It all comes down too ur driveing style/what you want.

[4runner [OP]]

I am also considering getting a turbocharged 4.3 liter that comes with 700r and 203 transfercase with adapter.
Do you think it would be alright to have a turbo motor when   rock climbing. Or do you think the turbo would be hard to control. I havent built my motor or tranny yet and i'm still debating on which motor and drivetrain to go with. That turbo motor is sounding better by the minute.Whats your opinion on the turbo? Thanks

[WHITE_TRASH]

I vote 4.3!  A turbo engine has lower compression ratio so itll lug farther down, plus if ya need a boost just hammer it!  If it wasnt for wanting to compete in Formula Toyota I have a 3.8 buick w/a carb & turbo I would love to use.  Hell yea use the 4.3!
WT

[84runner]

Your not really gonna see any benifits from that turbo until the rpm's get up enough for it to spool it up and create the boost you need.