Transmision gearing query...

4Rescue

4Rescue

Expedition Leader
SO the threads about VW's in the other section got me thinking...

Are there and aftermarket gear sets for the Manual Toyota Tranny's??? I know thsat the Turbo R151 (or is it 150?) has a lower first gear but are there any other individualy changeable gears out there.

What makes me ask this is back in my VW days, my Jetta had a 5spd manual with a custom gear spread in it. I used the Close ratio 1-4 from a GTI box and then had a Diesel 5th gear in it sp I could cruise down the hwy and not have the motor all reved up. It made for a great driving car and I think that something similar could make for an even better 5spd in my truck. I'd love to see a Low first, close ratio's 2-4 then maybe a taller 5th just for long straight stretches and HWY-cruising.

Maybe it's more work then it;s worth, but what do you all think?

Cheers

Dave
 
toyota_jon

toyota_jon

Adventurer
i'm not aware of any but if you come across something please let us fellow 1st gen 4runner owners know!
 
shawkins

shawkins

Adventurer
I know the R154 has different gear ratios in it, not sure if they are interchangeable into the R150 or R151 though.
 
Rexsname

Rexsname

Explorer
I'm pretty sure Marlin Crawler offers a lower 1st gear ratio for one of the toyota manual transmissions.

REX
 
EXP-T100

EXP-T100

Adventurer
Yes the r151 came with 4.313 first gear and that cane be put in an r150 replacing its 3.83 first. Marlin dose offer a 5.15 upgrade for the r151. I would call up Marlin and pick his brain, the man know these trannys like the back of his hand :costumed-smiley-007. Also the R151 was only in the US for two years 86 and 87, so finding one could be tuff depending on were you are.

gearing info: http://www.marlincrawler.com/tech/transmission/transmission-gear-ratio-chart
 
nickw

nickw

Adventurer
Yes - the 4.3 gearsets are available, but I dont think the 5.15's are anymore, at least they were not when I spoke to them a year ago.

Problem is, for the cost, you can have a crawler installed which makes alot more sense to 'most'. And a 4.30 set really is not THAT low, will take you from approx. 40:1 to 45:1 for a heafty chunk of change.

Although I like the idea, being completely stock without any modification, but the 5.15 set really made the most sense to go this route (down to about 55:1).
 
EXP-T100

EXP-T100

Adventurer
I like the lower 1st gear of my r151 for DD and towing, the offroad benefit is just a plus since i have duals
 
ntsqd

ntsqd

Heretic Car Camper
The potential fly in the ointment is if the the cluster gear is one piece or multi-piece. If it is one piece then you're limited to what you can find as group. If there are multi-piece clusters, then you may be able to mix and match ratios.

I have one of the 2WD R series behind an 22RET and that trans is slightly nicer to drive on the tarmac than my 4WD G series except for stop-n-go traffic. Then the lower first of the 4WD trans is a handy thing.
 
4Rescue

4Rescue

Expedition Leader
Yeah I knew that the Turbo's had a lower first gear and in reality that would be enough. I think I'll drop Marlin an E-mail and see what he says about the option of a 1st gear "upgrade" to a stock tranny. I also wish that someone made like a slightly lower then 1:1 4wd High gearing...I don't know like 1.7:1 That way you could still drive in 4-hi (witch is all but useless now except for long snow drives with no hills) and use the upper gears like you do in low to cruise (I'm guessing you could still do 55 in 5th) while still keeping wheel speeds up enough for sand and mud, then have a lower set of low gear like Marlin's 4+:1 gear-set for more gear control/crawling. All without having to modify your driveline from stock. Yeah you wouldn't have ll the gearing options of Dual-cases, but you'd have a nearly stock set-up with some simple mods. Throw on a twin-stick conversion and it'd be a really capable truck with a very compact drivetrain. not to mention how easy it is to find spare driveshafts since everyone else is changing thiers out for dual cases, SAS's etc. That said, it may just not be too feasable since I know nothing about how it all goes together (I've never torn a Toyota Tranny apart...)and if this is even possible. I suspect it is because I understand the basic mechanical principals of it, but I think asking Marilin or some of the guy's on the Marlin Board might yield a good answer. So I'll do that first...Something else I keep thinking of is running dual tranny's instead of cases, just cause it'd be cool... But that's another thread entirely ;)

I know there are some earlier Hillux guru's here though (DaveinDenver, ToyotaJon, DieselCruiserHead etc...) what do you fella's think.

Cheers

Dave
 
Last edited:
B

bjowett

Adventurer
Woohoo, you must be talking about the 1980's for that 5th gear swap.... been a long time since I've heard about that one! That was super easy, you could do it in the car.... you won't be that lucky with the Toyota.

Time marches on, these days you can opt for a nice 6 speed. Low first with a close ratio batch and overdrive. I dropped a Taco 6 speed in my FZJ80, it always has the right gear. Not an easy swap, though. I often wonder if something could be done with the Aisin AZ6, which is essentially a 6 speed version of the R series....
 
shawkins

shawkins

Adventurer
bjowett said:
Time marches on, these days you can opt for a nice 6 speed. Low first with a close ratio batch and overdrive. I dropped a Taco 6 speed in my FZJ80, it always has the right gear. Not an easy swap, though. I often wonder if something could be done with the Aisin AZ6, which is essentially a 6 speed version of the R series....
Click to expand...
How did you get the taco 6-speed to fit in the 80? I though the taco 6-speeds bell housing was molded onto the tranny case making it one piece?
 
B

bjowett

Adventurer
The driveline came from a 90/91 Passat Syncro. Syncro was VW's first AWD system, very different from the Quattro stuff. Later generations are used in cars like the R32 and Audi TT.
 
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