What speedometer gear do I use with a R154 and 4.30 LSD?

[Moy]

Alright folks, before you all tell me to search, I did look around and found this thread in particular quite useful:
http://www.supramania.com/forums/showthread.php?t=61169&highlight=speedo+drive+gear

Also read through this as well:
http://www.supramania.com/forums/showthread.php?t=38090&highlight=speedometer+cable&page=2

I've been speaking with Zumtizzle in the FlashChat about this, and here is what I (we) have come up with.

A Toyota truck with the R150 transmission and 4.30 rear end gearing uses the same speedometer drive gear as a R154 and 3.73 rear end gearing.

The R150 (4.30 rear end) uses a 33:10 drive gear, whilst the R154 (3.73 rear end) uses a 33:11 drive gear.

Also, (according to Zumtizzle) the R154 from a 1JZ using the 4.10 rear end uses a 33:10 drive gear.

Would I be able to swap a speedometer drive gear from a R150 transmission (having the 4.30 rear end), or speedometer drive gear from a 1JZ R154 into my current R154 to have the speedometer match the 4.30 LSD I have in the rear of my car currently?

Zumtizzle also mentioned something about a Toyota Celica speedo drive gear (4.30 rear end) fitting the R154 transmission. Could anyone back this up?

The reason why I ask is because I am doing an non-turbo auto to 5 speed swap, but would like the speedometer/odometer to read correctly instead of having to calculate the percentages they are off by, and then compensating by going that much faster (or slower).

I am 99% positive that I have put everything relevant in this thread, if not please let me know and I will go back over my notes again.

Thank you all for looking and for your help.
- Chris

 

[Doward]

What's the ratio of your stock setup? You just need to match the ratio to what you need - keep in mind tire size, as well!

 

[Moy]

What's the ratio of your stock setup? You just need to match the ratio to what you need - keep in mind tire size, as well!

Well... tire size currently 225/50/16... John, care to elaborate on "ratio of stock setup"? I understand certain things but still fuzzy on others...

 

[Zumtizzle]

W58 with 4.30 is 35:10

R154 with 3.9 is 32:10

I'd personally install the 35:10 from the W58 into the R154.

The sleaves are the same.

But whats really confusing is the 4.10 1JZ gear having a 33:10. :dunno:

 

[Moy]

W58 with 4.30 is 35:10

R154 with 3.9 is 32:10

I'd personally install the 35:10 from the W58 into the R154.

The sleaves are the same.

But whats really confusing is the 4.10 1JZ gear having a 33:10. :dunno:

Hmm... I knew I had something confused up in my post. So install the speedo gear from a W58 into the R154 would work then? Hrmm...

In this thread: http://www.supramania.com/forums/showthread.php?t=38090&highlight=speedometer+cable

The R154 uses a smaller diameter drive gear. It won't work in a W58.

and

yeah, I compared the W58 gear with the R154 gear and they are different in size.

So.... the R154 drive gear won't work in a W58, but the W58 gear would work in a R154?

That's what you're saying, Sumeet? (I realize we talked about this last night, but I can't go back and re-read it all because I didn't save it...)

 

[mkIIIman089]

So.... the R154 drive gear won't work in a W58, but the W58 gear would work in a R154?

Nope.

 

[Zumtizzle]

Okay what it comes down to is.

The Gear on the shaft that drives speedometer gear is a different size on the R154 is a different size from the W58 one.

R154 has 3 options, minus the other R series options. ; 32:10, 33:11, and 33:10

and

W58 has only one. 35:10

I think you need to change the name of the thread to.
"What speedometer gear do i use with a 4.30 and R154?"

 

[Moy]

According to NashMan in this thread: http://www.supramania.com/forums/showthread.php?t=61169&highlight=speedo+drive+gear

you will have to get one out of a 22rte truck/4runner they have the speedo gear you need very hard to find thou and finding one with a 4.30 as well

So assuming this is correct, a 4runner's speedo gear (with 4.30) would work in the r154 to match the mk3 4.30...

 

[Evilempire1.3JZ-GTE]

The odometer wont work but you could always cruze the car 100mph the higher the better like dyno or what ever then mark the cluster, basicaly reprint a face plate so the needle matches,
pick the gear set that maxamizes your speed and area of the guage face
scan the original cluster so you get the number font then print black & color over a clear film then do a new face plate.

 

[Moy]

The odometer wont work but you could always cruze the car 100mph the higher the better like dyno or what ever then mark the cluster, basicaly reprint a face plate so the needle matches,
pick the gear set that maxamizes your speed and area of the guage face
scan the original cluster so you get the number font then print black & color over a clear film then do a new face plate.

Uh... wayyyy too much work. And I want the odometer to work.

 

[Poodles]

Get a ratio box like IJ did...

 

[Moy]

Get a ratio box like IJ did...

Hmmm... I don't know any reputable shops around here that could do that, nor do I know what exactly I would need...


In FC, someone suggested getting larger wheels or tires to offset the speed difference... how would that work exactly? If the gearing difference would cause the speedometer to read lower, how would larger tires make up for that difference?

 

[Doward]

Taller tires have a larger circumference, and so go further on 1 revolution.

 

[Moy]

Taller tires have a larger circumference, and so go further on 1 revolution.

Makes sense. I'll look around to see how much larger I would need to go to offset the difference.

On another note. Question about internal gearing of R154's. (I have a feeling this question may contradict what I stated in my first post)

Is the gearing of the R154 from an 87 the same as the gearing from a 90? I know that the rear end ratios changed from 3.91 to 3.73, but did the gearing inside the transmissions change as well?

If it didn't, would it less troublesome for me to just swap in a 3.91 lsd (even though it's not really what I want to do)?

 

[Doward]

All R154s *except mine, lol* have the same internal gear ratios.

 

[Moy]

All R154s *except mine, lol* have the same internal gear ratios.

Good to know. Thanks John!

Now I am looking around online for mechanical ratio adapters, as I'm pretty sure the 4Runner (22rte and 4.30 gearing) speedo gear is not/no longer available from Toyota. Will check with my dealer about that, though.

 

[Doward]

I could probably source you one.

 

[Moy]

I could probably source you one.

From where? Jw... And for what price? :cry: Haha

 

[Doward]

I'll get back to you tomorrow

 

[Moy]

I'll get back to you tomorrow

Thanks John! You're the man! (no homo) :biglaugh: