3B in 4runner, blowing trannies (1 Viewer)

[huckthehaus]

hey cruiserheads

some of you may have seen my 3B in an '85 4Runner thread a while back. https://forum.ih8mud.com/showthread.php?t=130965

anyway, i've been toasting stock trannies, the W56 5spd that bolted behind the 22re (2.4 EFI) from '85 to '95. The first one made noise as soon as i drove the truck out of the shop. it was a spare tranny i bought cheap with 'low mileage'. so i pulled it out after 3,000km. the input did not have excessive play. i swapped my old 430,000km tranny in back in and it was quiet for about 2,000km. then the noise started again. the noise only happens when applying throttle from coast or backing off the throttle to coast. cruising, accelerating, and coasting it isn't much louder than normal. it can be heard doing this in 3rd and 4th but loudest in 5th. i drove across canada on the tranny last week, towing a 3,000 pound trailer, could have used 5th, but kept it down to 4th to play it safe.

ANYWAY: i need a stronger tranny. R or H series i'm guessing. only catch is i want to keep my mini truck dual case setup, which is 21 spline input, can upgrade it to 23 spline for the right tranny. could you guys make some suggestions or school me on the specs of the h and R series gearboxes? i'm up to doin some work tro make the tranny work, ie, swapping shafts or making adpaters

cheers,
dylan

 

[RHINO]

i'm pretty sure an R150 tranny would bolt up to the bellhousing, and then just a 23 spline and new adapter plate on the rear. i decided to give the r150 a try in my landcruiser behind an isuzu diesel, we'll see what happens. if it blows i'll prolly just swap to an H55, so, maybe you might think about that right now even though i have no feedback yet on the 150.
ive had guys tell me maybe, ive had guys tell me no problem, but no one has done it. i think you and i are in our own territory here right now.

 

[huckthehaus]

pardon my ignorance, the R150 is the minitruck V6 5spd? i know i'll need a marlin adpater behind it to run my dual cases, but you think a there is a factory bellhousing that will let me bolt a 3B to a R150? isn't the R150 23 spline input?

thanks man

 

[Tapage]

pardon my ignorance, the R150 is the minitruck V6 5spd?

I thought yes .. but here come in some gassers as 62 or 80 with 3F.

 

[RHINO]

yup 23 spline, i have marlins doubler behind mine also, was using it behind my cruiser 4 speed so i did the same excact adapter you'll need, its a skinny plate and new input for the tcase. i have no idea about a 3B compatible bellhousing for the R150, what i meant above was that i am pretty sure the bolt pattern on the fron of the trannies is the same so you should be able to use the W56 bellhouing on your R150. check with marlin.

tapage, one of the reasons i decided to give the R150 a try was i had read what you just said but never confirmed it. so, the R150 is definately bolted to a 3F down there? if thats true i feel much better about running it since the 3F has a decent amount of torque.

 

[Tapage]

so, the R150 is definately bolted to a 3F down there? if thats true i feel much better about running it since the 3F has a decent amount of torque.

I wil try to take some pics a 3F 80 thin weekend and Post here .. If I catch the owner

 

[huckthehaus]

i talked to dave at marlin crawler today, i can get a toybox adapter for $544 US to bolt a H41/H42 to my mini dualcases, or for $749 i can get that adapter plus a female 19 spline 4.7 input gear for my transfer case, which is required to run an H55f. a fair bit of machine work would have to be done to my front tcase and mini doubler to make to run the H55f.....

agh. so basically it would be a $2000 CAD swap for the H55f, tranny and drivelines in, or maybe $1000 for an H41 setup.

I'll have to think about that one

 

[Dougal]

Is there an alignment issue?

 

[UpsideDown]

Yes, starting to think that you have not got your transmission lined up on the bellhousing properly. I had considered a similar method to mating other transmission to the 3B, but aligning things with 2 to 6 thou would be a challenge.

How did you go about ensuring accurate alignment of the transmission to the engine?

~John

 

[huckthehaus]

i removed the flywheel from the motor, and bolted a sleeve in its place located by the crankshaft. the tranny input shaft is located by a steel bushing i made to temporarily replace the pilot bearing, and by the major diameter of the splines. i did all the machine work, the sleave was not at fault. because of this sleeve, the input shaft and crankshaft are square and cocentric. the bellhousing i milled was also square, as is the back on the engine block and front of the tranny. the only thing that could cause error is the normal play in the input bearing, and i used an indicator to center the tranny housing in the middle of the bearing play on the x and y axis., it was about .0032"

these trannies are designed for a 2.4 gasser. they don't like pushing an overweight, undergeared, overpowered vehicle around. basically, i knew this issue would arise sooner than later, i only made the adapter to save money at the time.

 

[roscoFJ73]

The first one made noise as soon as i drove the truck out of the shop. it was a spare tranny i bought cheap with 'low mileage'. so i pulled it out after 3,000km. the input did not have excessive play. i swapped my old 430,000km tranny in back in and it was quiet for about 2,000km. then the noise started again. the noise only happens when applying throttle from coast or backing off the throttle to coast.

cheers,
dylan

I cant help being a little sceptical about the 3B being too powerful for the 4runner type transmissions.
After all they use these types of gearboxes behind the 1PZ 5cyl which has about 10+ more HP than a 3B.
You bought a supposedly low mileage box which died and then you swapped it for another with 430000klms

Maybe a rebuild before they go in would do the trick

 

[huckthehaus]

yeah maybe, but the 1PZ has an R series box behind it, no? look similar on the outside, much beefier with.

basically marlin crawler has told me a W56 is 100% stronger than a G58, an R151 is 100% stronger than a W56, and an H is just a brick s***thouse compared to those minitruck trannies (much bigger gears and shafts and slightly bigger bearings than an R)

 

[Otterav]

Ola,
The title to this thread is slightly pornographic, thanks for the chuckle.
You win the best thread title for '07
eric