well, diffs or t-case

im thinking of a marks adapter kit with the 8% underdrive final ratio and 63% final reduction or whatever it is

MFK1190

or
4.88s in the diffs

what would you do and why

i have a turbo 2H, ARBs, split case, 34mm idler, 35s and junk :confused:

depends ich is lower gearin. id say t-case if its an oprion though since youd hafta do 2 diffs instead of one t-case...but $$$ is a factor too...for some of us:rolleyes:

Both dude!!!:smokin:

You don't mention which diff ratios you have right now, and whether you use the truck on the road or trailer it to the trails. If you're running 35's with 3.70's or even 4.11's, you might want to regear the differentials regardless...

IMNSHO, the Marks gears don't provide that much reduction that it will eliminate the need for diff gears change. I think you'll have to do both!

35s x 4.11s
i drive it everywhere, its a daily driver as well as driving to comps, to the shops, to visit mates, its my only car so its gotta do some street k's aswell

oh and its diesel

you missed the most popular mod

change the trany nv4500 ? sm420 ?

neither, do a tranny swap like the above swap. WAY more bang for the buck. SM420 isn the easiest cheapest way to go. Can you get those in Oz?

SM465 is what I run, but the adapters are more costly.

I was chatting with BJ about that exact same thing. I guess SM420's are not that easy to find there. And they really never had a three speed bellhousing for the diesel. So mating the two is kinda difficult..
Actually I kinda like this. They get all of the cool cruisers, not to mention diesels but to make up for it (sort of) we have the venerable SM420's and 465's...

I still think they are a bit better off than we are though
:p

didnt the early H41s (mated to the F) have a really low first gear, i might be able to get a hold of one of them....
maybe thatd be worthwhile

is there a site with ratios of SM420-465, that i could compare to the H41 and NV4500 (the NV4500 may be too expensive for my liking) and how many $$ US to adapt these? keep in mind my dollar is worth half of yours!!

but a 420 or 465 is definitely not common, in fact id probly have to import it one and by then i may have been better of going for t-case gears

The H41 that is mated to the Diesel like you guys have has a 5.2:1 first gear. The one from the petrol engines has a 4.9:1 first gear.

SM465-6.54:1
SM420-7.03:1
GM NV4500-6.31:1
Mopar NV4500-5.7:1 (?)

You would be better off with those Mark's 3:1 gears in the split case mated to a H55 and 4.88 gears.

I'm pretty sure that 5.2:1 H41 was only available 1 year in the FJ55, it's a rare tranny. The common H41 was 4.9:1

As for which to get, diffs or t/c gears...

4.9x3.05x4.11 = 61.4 (t/c gears)
4.9x2.27x4.88 = 54.2 (diffs)
4.9x3.05x4.88 = 72.9 (something to think about)

Get the t/c gears.

4.9 x 2.27 x 4.11 = 45.715

really getting me thinking

thanks fellas

keep 'em coming with more details

loving these calculations SM420
7.03 x 2.27 x 4.11 = 65.587
:eek:

and who voted buy a jeeo :rolleyes:

NEVER GUNNA HAPPEN :flipoff2:

Man there is some really good info in here.:)

Tell you what BJ42, I will send you an SM420 and adapter with US 3 speed transfer case in trade for an H55 with split transfer case.

One is common here, one is common there.

Let me know off line wngrog@aol.com

Originally posted by mickfatty
Man there is some really good info in here.:)

yeah, i think you got the wrong guy, i read that thing in general and have nothing to do with it

see his username:
mickbj42
and mine:
bj42

its like a fj40, and there are a few people on here with names that mention there cars, LOTS of them in fact...especially to do with fj40s, so think of it like that, just because one person in a fj40 had a fight with you doesnt mean anyone else want to have a fight with you and get themself banned.

you drive a suzuki right?
so there is no really good info in here for you...is there?
hmmmm



hey wngrog
thanks for the offer but H55F are still worht a mint over here are teh SM style transmissions 4 or 5 speed? and yeah i can get an early cruiser f, 3 speed case and gearbox, was running in vehicle and for free over here, they are wrothless and get given away. but thanks for the offer.... i think i will go t-case gears for starters

One thing to consider if going with the tc gears prior to doing the diff gears.
With the tc gears the stress level on the driveshafts and on the motor/tranny mounts is going to increase. Your motor, thanks to the new tc gears, is going to be pushing a lot of torque out the tc outputs, this torque is then trying to turn those 35's via your 4:11 diff gears. May not be a big deal unless you get the tires bound up then the driveshafts are gonna get a lot of stress and the drivetrain is going to be trying really hard to rotate in the opposite direction. (the drive train part is going to happen regardless it just gets more pronounced the lower (higher numbers) your gearing gets. Just something to think about. My vote is diffs first.