Here is my planned setup:

4.3L TBI V6, TH350 auto, dual Toyota cases (2.28x2.28), Dana60's F&R w/ 4.88's (may go lower if necessary), and 42" TSL's... all under a relatively light 1990 Toyota standard cab short bed truck with a tube bed in the rear...

I am having some people say the V6 just won't turn the 42's :confused:


Anyone have any thoughts on this?

I see their point to an extent, but I also know people running 38.5's and stock 22R 4 bangers and they seem to be able to turn them just fine....

BTW, this will be trailered to the trail - so road performance needs to just be good enough to get me a short drive to the trail head.....

don't know for sure but i will let ya know after the first of the year cause that's exactlty what i plan on using. (unless i get a wild hair and get the 44 bogger :D)

You gonna be my truck twinkie camo? :p

I think it will be fine - sure, I won't be able to do brake stands and smoke 'em.. but I never saw a need for that anyway :D

BTW - I am picking up the 42's this weekend :cool2:

I figure I can always sell them (they are used) if they are just too big :p

If you are willing to go with a steeper gear you shouldnt have any problem at all. I would run 5.13s. They arent too low for a trailered rig and are available for d60s I believe in rev rot. as well. This way you arent undergeared and you will be able to drive it on the road as well. I am undergeared in my cj5 with a 350, 3.73s and 36s. and it sucks when you run out of power. You will regain alot of gearing with the 42s

The only reason for the 4.88's was simply that I already have a set in the front 60 I got, so I was trying to save some $$$ that way...

So realizing 5.13's would be "better", anyone have any comments on how the 4.88's would do?

well your 4 cyl turned 35x16 boggers so I think you will be fine with the extra 80hp/100lb/ft torque and 42's

I don't think you'll really have much trouble unless you're in some really thick mud. And even then, with 4.88's & a 2.28 T-case, I'd say you could run 1st-gear in the TH350, 1:1 in one t-case, & low in the other. Should still be able to get some tire spin. That's 28:1 & that's almost double the ratio I use in my mud racer (yeah I know, less tire & more engine, but still). And if that doesn't get it, shifting the 2nd box into low will DEFINITELY get you some wheelspin (albeit not with a lot of speed).

TEX

Originally posted by DRM
Here is my planned setup:

4.3L TBI V6, TH350 auto, dual Toyota cases (2.28x2.28), Dana60's F&R w/ 4.88's (may go lower if necessary), and 42" TSL's... all under a relatively light 1990 Toyota standard cab short bed truck with a tube bed in the rear...

I am having some people say the V6 just won't turn the 42's :confused:


Anyone have any thoughts on this?

I see their point to an extent, but I also know people running 38.5's and stock 22R 4 bangers and they seem to be able to turn them just fine....

DRM I was responding to your Question. 4.3l. & 42s. For the real answer on what to run bag the 4.88s unless lugging your motor down and wearing on the clutch or staying in 4l 4h on your dual case setup is in your plan. The right ratio to go with a tire that size and the torque of a 4.3 would be closer to 5.38s without it effecting power loss. 5.13s is a compromise and 4.88s are a mistake. Gearing is gearing and 42s arent small so everyone can chime in about how well they work but they are the same as when I thought my 3.73s were just fine. Then I couldnt climb a rock face with those gears and I was pissed.If they would go to a steeper gear they wouldnt agree. So the smartest thing to do IMO is sell the 4.88s and get some 5.13s. Hope you only have to do it once.

How much are you paying for the 42's??

Seems like you should be fine since you're running dual cases, especially since it's pure trail rig. If it's not low enough for you, you could always keep the 4.88s and throw a 4 to 1 in a tcase. Just a thought.

Originally posted by convertiyota
How much are you paying for the 42's??

Seems like you should be fine since you're running dual cases, especially since it's pure trail rig. If it's not low enough for you, you could always keep the 4.88s and throw a 4 to 1 in a tcase. Just a thought.

Well this would work and since its a toyota with multiple gear reduction I will lay off on the 5.13 idea I know when its a pointless gearing idea. I have Jeeps so I have to gear down at the axles for there is not the room for multiple transfers. Its just a 42 is a big tire.

Im going to work, I dont want to play with you anymore HUH!:crybaby2:

fyi....i will be running 4:10 mathmaticly incorrect i am sure but real world it will work great on my trail rig.

Thanks for all the comments guys :)

Looks like my crawl ratio with the auto, dual cases, and 4.88's will be 50:1 which I believe would be about like 100:1 for manual tranny:
2x2.28x2.28x4.88=50.74

figuring in 5.13's gets me:
2x2.28x2.28x5.13=53.34

Off road, that is really not that big a difference IMHO.

Now dropping down to some 6.17's would start to show up:
2x2.28x2.28x6.17=64.14


Anyway, like I said - on road use is really not that big of a consideration, other than occasional 15 mi. or less trips here or there...

Its all in the gears. Iam running a 198 V6 and 36" swampers ( yes I know there not 42"s ) but heres the thing. I am running 5.38 gears so when ever some little punk pulls up next to me in some fast looking foreign crap box car and revs his moter acting like hes some bad a$$, all I have to do is lock it down in 2nd, drop the cluth and smoke those 36s through the intersection. Friends tell me I need a v8 but when I put in in first there is no stopping me on the trail, so whats the use. Heres another example, I own a 1949 or so cletrack tractor ( equal to about a D2 cat ) it only develops about 35 horse power in the little 4 cylinder moter it has, but i could pull a house off its foundation if I wanted with it.:usa:

screw it, you should be ok. As long as you have a good low range they should pull ok... Not like your going to be drag racing people with it :D If your not happy with the power after a couple trips then add another t-case. The yota guys double them up all the time... Major low-range :D

BTW: If you dont end up liking the 42's I'll take them off your hands. I'll slap them on my Jeep. Who cares what the Dana 44 thinks about it :D

I think what everyone needs to remember is that since this is strictly an off-highway machine, the axle ratio is really inconsequential. What matters is how much TOTAL gearing he has available.

Think of it this way, with a 2.28 reduction & 4.88's, he'd be the same as a guy with a Dana 20 and 5.56's.

With 4.88's & dual boxes, he'd be better off than someone with a single 4:1 & 6:17's.

The ONLY time those 4.88's are gonna seem weak is on the highway. And how fast is he gonna go with 42's? Hell, just run it with both boxes in high-range, tranny in SECOND gear, at about 3,000 RPM's, & you'll be doing ~50 MPH. I sure wouldn't want to go any faster than that anyway :)

TEX

42's with a stock 4 Banger and Dana 60's:

http://www.sierrarockcrawlers.com/images2/1030.jpg

http://www.sierrarockcrawlers.com/images2/1032.jpg

http://www.sierrarockcrawlers.com/images2/1037.jpg

He GETS it.

well there ya have it. :D

Ahhhhh.... I like :D:D:D

No problem with the 4.88's. On road, it may be a bit sluggish off the line in 2hi, but once geared down off road, you should be able to spin them pretty much at will.

My crawl ratio is 3.06x4.0x4.88 = 59.73:1 and with the little bit of testing I have done so far, it is perfect.

Your crawl ratio with a TH350 should be
2.5(or so)x2.28x2.28x4.88 = 63.42 I think.

Mine is pushing 37's, not 42's though...

Originally posted by 82FB
Your crawl ratio with a TH350 should be
2.5(or so)x2.28x2.28x4.88 = 63.42 I think.


I thought the TH350 had a 2:1 first gear? :confused:

Off to the Pirate Bible to see :p

Originally posted by DRM


I thought the TH350 had a 2:1 first gear? :confused:

Off to the Pirate Bible to see :p

TH350:

2.52
1.52
1.00

TH700
3.06
1.65
1.00
0.69

TH400
2.48
1.48
1.00

4L80E
2.48
1.48
1.00
0.75


For the most part, almost all 3-speed automatics are rougly:

2.5
1.5
1.0


TEX

Well, looks like I erred... and in my favor :D:D:D


according to the Pirate Bible, it should be 2.52:1 first gear in the TH350 :cool2:

Don't know if this helps but here's my story.
My truck before I tore it apart: carbed and running VERY bad 4.3, (all new just not tuned)th350 with shift kit, 203 t-case, toy axles with 5:71's. I could power brake it and smoke the 39.5's leaving a pair of black patches in the driveway. It would rev out at 60 mph at like 4000 rpm. In 4lo it was a powerful beast. In 4lo with the front hubs unlocked I could launch it and pick the front wheels off the ground about 4 inches. I had it in mud up to the front bumper and had to use 4LO 2nd and 3rd gear to get the tire speed I needed.

Power was NOT an issue. You are running EFI I assume. You should have more power, but with the 60's more weight. You have dual cases I did not. Leave the 4:88's in and go with it. From what I have seen from your pics you will be needing some wheel speed for slick rocks and mud. With the dual cases you have enough ration selection for the 4:88's I think. I just hope that the 4.3 and the th350 are not tired and I'm wrong. :)

david,
you know I can't let this post go.Ican't believe Adam hasn't chimed in ....honestly, what are you planning on riding?? are planning on riding the stuff we ride...if so I would suggest looking for the v-8 the 4.3 won't cut it dual transfer cases or not.If you plan to do a lot of "crawling" then I think you will have a good lightweight set-up. ....but, don't get into to much of a hurry...your award for the most missed rides and meetings might be in jeopardy:D

I run a sacked out 80 buick 3.8 and it is fine on the trail. I run 5.13's and 39.5's so your setup will be just fine. I have about 100hp at best and can't wait to put my 4.3 in. On the road you would be happier with 5.38's or more but as you said it is a trail rig... not a grocery getter.

Originally posted by onetonwillysands10
david,
you know I can't let this post go.Ican't believe Adam hasn't chimed in ....honestly, what are you planning on riding?? are planning on riding the stuff we ride...if so I would suggest looking for the v-8 the 4.3 won't cut it dual transfer cases or not.If you plan to do a lot of "crawling" then I think you will have a good lightweight set-up. ....but, don't get into to much of a hurry...your award for the most missed rides and meetings might be in jeopardy:D

Come on Brian... EVeryone told me the 4 cylinder and 35" boggers would not work either ;)

The price is right on the tires, and I already have the 4.3L...

I was really only wanting 39.5's anyway, so I can always downsize in tire :D

DRM, Badassjeepguy is looking to goto 42's and he's got 39.5's now. Trade maybe ? and his rig is trailered to 1-2 mi from trail also. Not many miles on the 39's.

4.3 is great on the trail plenty of power and i can spin my wheels just fine and break alot of parts still:flipoff2:

I would say if you want Burnouts and drive up steep hills go V8
mine drive's killer in the flat lands


my T18 needs a middle gear between 3rd and 4th for the hills this is where the auto will rule !!
3rd to low 4th too high

DRM I think with the auto you will be fine !! and the 5.13 gears are the way to go!! spend the little coin!!!

mine has T18 = 6.32 Atlas =4.3 Gears = 5.13 total crawl=139 or so
(no calculator right now:flipoff2:)


Adam,

Originally posted by flimmy
DRM, Badassjeepguy is looking to goto 42's and he's got 39.5's now. Trade maybe ? and his rig is trailered to 1-2 mi from trail also. Not many miles on the 39's.

These will be for 16.5's and I am making my own beadlocks... probably not what he is looking for....

He has 9's in the f&r now and is going to 60's , so I'm not sure what he's going to run, could be 15" 8 lug or the 16.5 ?

Originally posted by DRM


Come on Brian... EVeryone told me the 4 cylinder and 35" boggers would not work either ;)

The price is right on the tires, and I already have the 4.3L...

I was really only wanting 39.5's anyway, so I can always downsize in tire :D

david,
I did't say it wouldn't "work"....but if you plan to ride the stuff we ride then it is kinda like going bush hogging with a murray lawnmower..:D hope to see it soon either way.