Gearbox with top gear of 0.7 ish???

[Elmo]

Just wondering if anybody has any knowledge of a gearbox that may be able to be used in a Hilux with a top gear of around 0.7??

My ideal top gear would be 0.724 but close enough will be good enough.

Nearly every factory Hilux box is a top of 0.851 or thereabouts but I'm wanting just that bit more.

Not fussed if it's achieved by a 5spd or 6spd, Hilux box, supra/celica box etc or whatever just curious if anyone knows of anything about.

Cheers peeps

[Struth]

R154 is 0.753


http://en.wikipedia.org/wiki/Toyota_R_transmission" onclick="window.open(this.href);return false;

[Elmo]

Cheers Struth, that'll work quite nicely.

Now to try find one!

[ozrunner]

What engine is this for ?

Be aware the R154 has a 30mm longer input shaft than the R150/151's so it will not be a straight bolt up without a spacer or modified bellhousing, depending on your engine.

If you can locate a R452 trans from a Dyna truck its overdrive gear is a straight swap into a R150/151 and it will give you 0.7, ie a 30% overdrive.

JD

[Elmo]

Jeez that's a good bit of insight there bud, thanks a ton.

It's going behind a 2.8 (3L) Diesel.

Any idea on the current haunts for Dyna gearboxes?

[ozrunner]

Ok the R154 will not fit behind a 2.8 unless you mod the bell, fab a spacer or have one cast.

However, you could do research on the later Prado and Hilux's that used the R series and their bellhousings as I understand they used a longer input shaft R series, but how much longer than the older R series, that I don't know. Their bell would need to be an extra 30mm longer than yours to use a 154.

I actually use a R154 in my 4Runner behind a 347 Ford but I had Dellows make a bell 15 years ago. The R154's overdrive can also be changed from (0.75) 25% to (0.63) 37% which I have also done. Cruising in overdrive is a hoot

http://members.iinet.net.au/~ozrunner/g ... uising.jpg

I would assume truck wreckers would be the best bet for Dyna boxes but I've seen them on evil Bay. Need to be around 89-90 models for the correct tooth count overdrive gears.

[oldmate]

Any idea on the current haunts for Dyna gearboxes?

Try Jap Truck at berkely vale.

Otherwise you could check out the ads in the truck magazines. Some companies will do the searching for you.

If you go with a dyna box you have to consider the transfer case.

Another option is an R151 with the safari overdrive replacement.

[ozrunner]

"If you go with a dyna box you have to consider the transfer case"

No, all he needs is the overdrive gears out of it to fit into a R150/151 as he wants a 30% overdrive and that's how he can get it.

Rob

You will be looking at some coin to do all this so are you sure your rig will "pull" a 30% overdrive as the 2.8 isn't a powerhouse

What is your main use for your rig ?
What gears do you run ?
What tyre size ?

[Elmo]

Cheers again for the replies guys, I'm really appreciating the help.

It's sounding like the R154 might be worth holding until I pursue the R151 option? Purely due to the bellhousing effort. Although the 0.63 sounds lovely!!

I'll definitely give the jap wreckers a go, any idea which are the companies that do the looking?

3 questions =
Main use is everything bud, 1000km a week daily on 35's to play on 38's

Currently my diff gears are 4.88 with a std top gear of 0.851.
However I have my other set of diffs with 5.71:1 gears in the shed and mathematically a top gear of 0.724 will create the same top gear as 4.88 on 0.851 although with a much larger spread below so top end speed should be no different.

The big thing I like about the lower diff gears is all the stress it relieves from the rest of the running gear by everything being able to turn easier, it was the best thing I ever did to my last truck and I subsequently had way less breakages, so I'm keen to work out a way to re-emulate that again. What do you think bud?

[ozrunner]

Ok now I see why, ie using the 5.71's.

Here's what would be involved;

R154.

Find and purchase a R154 (Usually around $1500)

Locate/purchase a R150/151 output shaft and have it swapped into R154 ($$$$- ?)

Mod or have a bell made ($$$$ - ?)

All too costly and should you ever screw the R154 you will have to find another and they are not easily found.

R150/151 - Recommended Option

First you would need to determine what 1st gear you want, ie a R150(3.83) or a R151(4.31)

Then whatever deal costs less, either purchase a trans and bell from a 2LTE Surf selecting either the R150 or R151 as Surfs came with both or V6 4Runners only had the R150 and you get a bell from a Surf etc, bolt it all up and you're done.

R150/151's are also easy to find and a lot cheaper than 154's.

Eventually swap in the 5.71's and test with stock OD gears and if ok leave it.

If not, keep an eye out for a R452 and swap its OD gears in when available etc. Can be done from underneath if you have gear pullers.

Also you can always easily swap back to original gears and diffs, if required or circumstances change etc.

I concur with your gears reasoning.

JD

[Elmo]

Thats awesome bud, thank you.

It just seems all too easy, looks like the R151 will be the go, more so for second gear as with the 5.71's i used to take off on the street in 2nd all the time, albeit slight clutch slip if it was hilly and the R151 is slightly lower in 2nd as well so should be even nicer regardless of terrain, PLUS 1st for those big hill starts and crawling..

Time to go looking for parts now. I cant see the R151 being a problem but the OD gear of an R452 could be.

Also

Oldmate you mentined the Safari overdrive replacement gear for the R151? Have you any more info on that?

[oldmate]

Oldmate you mentined the Safari overdrive replacement gear for the R151? Have you any more info on that?

It is still on their website
http://www.safarisnorkel.com/turbo/1hz_76/5th_gear.htm" onclick="window.open(this.href);return false;

But another site:
http://forum.ih8mud.com/70-series-tech/ ... drive.html" onclick="window.open(this.href);return false;

post #6 says they are no longer being made.

You would have to contact Safari directly. Seems it might not be an option.

If I recall correctly it was pretty pricey anyway. But it might have been worthwhile if you could save by not having a custom bell housing etc.

[Elmo]

Oldmate you mentined the Safari overdrive replacement gear for the R151? Have you any more info on that?

It is still on their website
http://www.safarisnorkel.com/turbo/1hz_76/5th_gear.htm" onclick="window.open(this.href);return false;

But another site:
http://forum.ih8mud.com/70-series-tech/ ... drive.html" onclick="window.open(this.href);return false;

post #6 says they are no longer being made.

You would have to contact Safari directly. Seems it might not be an option.

If I recall correctly it was pretty pricey anyway. But it might have been worthwhile if you could save by not having a custom bell housing etc.

Cheers Bud, im intrigued, nowhere in there does it mention anything about Hilux's or Surf's and yet it has the same R151 model designation for the box, makes me wonder if that is the same box? If indeed it is then no wonder we consider it a bloody strong gearbox when cruisers run it behind the big 4.2 Litre diesels.

Price said $1595rrp but with a discount to $1275 for that group buy. Jeez thats expensive for one gear!

[oldmate]

Ironically the R box is the weak link in the 1hz 105s and 70s

Another option might be to get an engineering firm to make up some gears for you, if all you want is the taller 5th and are happy with the other 4 (technically 3) gears

Google came up this: http://www.diecrest.com.au/" onclick="window.open(this.href);return false; who claim to be no stranger to custom automotive gears. Looks like they can design and manufacturer the gears, and will do one offs.

If their price is right i'd say there could be some more interest.

[Elmo]

Ironically the R box is the weak link in the 1hz 105s and 70s

Oh really? So it probably is the same then, strong for us, weak for them.

Another option might be to get an engineering firm to make up some gears for you, if all you want is the taller 5th and are happy with the other 4 (technically 3) gears

Google came up this: http://www.diecrest.com.au/" onclick="window.open(this.href);return false; who claim to be no stranger to custom automotive gears. Looks like they can design and manufacturer the gears, and will do one offs.

If their price is right i'd say there could be some more interest.

They look good, i just emailed them being that it is a Saturday afternoon so hopefully we will see what happens.

[Elmo]

Otherwise you could check out the ads in the truck magazines. Some companies will do the searching for you.

Any idea which companies were the ones that do that?

[Struth]

Ironically the R box is the weak link in the 1hz 105s and 70s

Another option might be to get an engineering firm to make up some gears for you, if all you want is the taller 5th and are happy with the other 4 (technically 3) gears

Google came up this: http://www.diecrest.com.au/" onclick="window.open(this.href);return false; who claim to be no stranger to custom automotive gears. Looks like they can design and manufacturer the gears, and will do one offs.

If their price is right i'd say there could be some more interest.

I think there must be a difference between 1HZ Rs and Lux based Rs, we have run them behind V8s in our club, some even turboed 5.0s, and never busted them. You do need to ensure you don't overstress 5th in lo range though.
I was given to understand there is a shaft coupler in there that perhaps has less splines on the 1HZ units.

Our cars aren't light once diff conversions and full barwork are taken into consideration either.

Perhaps someone can share some light on the issue with 1hz units.

[slosh]

I think there must be a difference between 1HZ Rs and Lux based Rs, we have run them behind V8s in our club, some even turboed 5.0s, and never busted them. You do need to ensure you don't overstress 5th in lo range though.
I was given to understand there is a shaft coupler in there that perhaps has less splines on the 1HZ units.

Our cars aren't light once diff conversions and full barwork are taken into consideration either.

Perhaps someone can share some light on the issue with 1hz units.

I read somewhere that some R boxes came with one piece main shafts or something, making them the strongest ones?

[oldmate]

Perhaps someone can share some light on the issue with 1hz units.

The third/fourth hub strips the splines. Never boxes have longer splines.

It's probably more of an issue with landcruisers like the 105 which are often well overloaded and towing and likely to spend a fair amount of time at full load in third or fourth.

Any idea which companies were the ones that do that?

I keep forgetting to ask my old man. He is the one who mentioned it, and is occasionally after some Coaster parts.

[Elmo]

Bit of an update fellas.

Since the last post I've located both an R151f and an R452 so happy days!!

The R151f I've already picked up and gotten home whereas the R452 is getting bought over next weekend from out west so can't actually start yet but should be a good thing.


Ozrunner - thanks for introducing me to this particular idea man, I've done TONS of reading and explored every option mentioned above by everyone and after delving in to the R452 gear it sounds awesome.
Don't suppose you got any more details as to the actual nitty gritty of doin the job do you?