High RPM shifts, W58 or R154?
 

I dont own a Toyota, but am considering a few different trannys for a mitsubishi 4g63 powered rwd project. The 2 toyota ones im considering are the W58 or R154.
I cant seem to find the info that I need about these trannys, so I hope you guys can help me out or point me in the right direction.

I dont need to know if it wont or will work. What I need to know is what is the max rpm I will be able to consistantly shift both of these?
I know the R154 is stronger. I read on here that the W58 can hold up to around 400whp, and the R154 ive read different limits from 600-1000. I think either of them will hold the power from what ive read, but the W58 might not last as long.

The engine that will be used will probably be around 300-400hp and rev to 7-8k maybe more.
Do you think either of these trannys will work good with these specs, or should I look at my other options?
If there are any other PROs or CONs to either of these please let me know.

I think I already have a W58 (out of a 84? celica). I would like to be able to use it, but if it wont hold up Ill have to find a R154 or something else. Is there any identification marks on it to verify that it is a W58?

Thank you for your help.

1st off. It's blatant blasphemy what you speak of..

Adding toyota parts to your mits will NOT raise it's value, and you really only disgrace our beloved toyota by bastardizing the 2 seperate entities.

That being said. The r series tranny is what you want.
The redline is at 6k on the w series.

You should expect 7k rpms to be the max revs for safety on these trannies.
And 7k may be pushing it. But if you set it up right.

The r series would do what you want. Not the w.

This setup will probably not be going into a mitsubishi or toyota. Im just looking at toyota for a possible transmission. I havent even picked a vehicle to put it in yet. Im Looking for something kinda light and rwd, but havent narrowed it down yet. I guess you could say that im doing the project backwards. Most projects start with a car first and build from there. This one starts with the engine, then find a good tranny that likes the engine, then find a shell that the engine/tranny will fit into. Im not brand loyal unless it is the best or most practical option.

The reason im not using a mitsu trans is because of the limited options for rwd (2 versions of basicly the same transmission) and too low of a shift limit, so im trying to find one that will better match the powerband of the engine.(potentally up to 9k or more)

I mean no disrespect to toyota, the people that own them, or anybody on this forum.



Does anybody make upgraded tranny parts for the w series?

What is the shift limit on the r series? Are there any upgrades for it?

Another option that I have is a mazda tranny from a rx7. It will shift at real high rpm since it is setup for a rotary, but I havent looked into its holding power.

please keep the info coming.

Thank you for all the help

Is there a different toyota forum that might have better input on these questions?

Does anybody know any links that will help answer some of these questions?

After a little more research I think the tranny I have is actually a w55.

First off your question was answered the R154 tranny is a very robust and reliable tranny. It is one of the most heavy duty sport type trannies ever designed by toyota and dare i say it by anyone. So there you go.

you want the R154, overall its a stronger transmission and can take a lot more power than the w58 can.

there is this forum, Supraforums, and SupraMania - Powered by vBulletin. stay between these three forums and youll be fine for all the information that you need.

there were diagrams of a w58 and r154 to tell them apart, but i dont have them bookmarked or know offhand myself...im automatic. ill browse for em, but cant promise ill find them.

W55 gear ratios

1st 3.566 2nd2.056 3rd1.384 4th 1 5th 0.850 reverse -4.091



W58 gear ratios

1st 3.285 2nd 1.894 3rd 1.275 4th 1 5th 0.783 reverse -3.768



R154 gear ratios

1st 3.251 2nd 1.955 3rd 1.310 4th 1 5th 0.753 [b]reverse -3.18

duh, im stupid, its a sticky lol.

http://www.toyota-supra.info/forums/...-w58-r154.html

Thank you for all the feedback.

My main question hasnt really been fully addressed yet.

I know the r154 is extremely strong, but it is also bigger and heavyer.

The w58 is decently strong and is smaller and lighter.

If I put this setup in a really small car i might not be able to fit a r154 without cutting out and reshaping the tunnel. If it does go into a light car, there will be less strain on the tranny because it is easier to push less weight. So, 400hp in a 3500lb (I dont know what your cars weight) might be max for the w58, but 400hp in a 2000lb car may last for 50k miles.
For that reason I stated in my original post that I dont want to know what will or wont work. If I go with a mid-heavy weight car I know I will need at least a r154, but I am exploring my options right now. I may decide that a 3rd tranny from another make might work better for me than the r154. Im just looking for consistant max rpm shift points right now.
If X tranny can hold 2000hp, but cant shift above 6k rpm it will be useless for what I am trying to build.
I hope this better explains what im trying to figure out here.

The engine that im using has a stock rev limit of 7500. For this project it will be setup for somewhere between 7500 and 9000 depending on many variables.

Will I be able to consistantly shift either of these trannys at this rpm in stock form and if not is there anybody that makes upgraded syncros or anything to help them?

Thank you

Kinda thought we answered that.