What Transmission / Adapter is this? (1 Viewer)

[zacharyws]

Alright, this one has thrown me for a loop this week. I am getting ready to pull my transmission / Transfer Case / Clutch to rebuild and I am trying to get ahead on ordering some parts in advance when I realized that I do not have what I thought I had.

The truck is a 74 with a 350 and a 4 speed. As it turns out the 4 speed is not the Toyota that I had thought it was. It appears it may be a SM420 or a SM465 but I am struggling to find the casting numbers on the case.

So far I have found: "45X" on the top behind the shifter "465" on the passenger side and "7141498" punched into an ear.
Where I am lost now is that the outside of the case looks more like a SM420 than any SM465 that I have seen online, but it is hard to refute the 465 casted in the side.

Does anyone with any experience in these know what this transmission is and what the adapter to mate up the transfer case could be?

DRIVE LINK TO PHOTOS AND VIDEOS

FJ40 Transmission

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photos.app.goo.gl

 

[pb4ugo]

I'm confident it's not a 420. It looks like someone is using an SM420 bellhousing with an adapter plate bolted between the bellhousing and trans. A 420 has a round bearing retainer, the trans you have has a figure 8 trans bearing retainer similar to a stk FJ40 4 speed. It looks possibly like a stk FJ40 tranny and tcase. You need to remove the clutch inspection cover and look up in there. Probably a chev pp, clutch disc and a throw out bearing of some sort. You'll likely have to tear it apart then figure out what parts you need.

 

[pb4ugo]

Can you get a pic of the top of the tranny from inside the vehicle?

 

[pbgbottle]

Very odd that adapter plate and bellhousing etc was usually used with Toyota 4 spd. I don’t see a tcase adapter either it’s not a 420 or a 465. And if it was they wouldn’t use that adapter plate or spacer plate. The front bearing retainer looks Toyota. Is it a 4 spd transmission. ? Very wierd. Not sure what it is. The adapter plate is strange. Unless it’s a Muncie hmm. Must be a wierd Toyota transmission. I’m stumped. Wow. Super odd looking. But the adapter is saying it should be a Toyota 4 spd. But that doesn’t look like a y Toyota 4 spd I’ve seen.

 

[peesalot]

pre split case 4spd

 

[zebrabeefj40]

That's a stock Toyota 4sp. "Back in the day" there was an adapter plate to mate the 4sp to the Chevy bellhousing. Looks like you've got one...

Nick

 

[zacharyws]

That's a stock Toyota 4sp. "Back in the day" there was an adapter plate to mate the 4sp to the Chevy bellhousing. Looks like you've got one...

Nick

Do you have any idea who made this? I spoke to Advance Adapters and they seem to think that it was not a Toyota transmission and mentioned that they did not make it. They had mentioned that it could be Danny Warden?

 

[bikersmurf]

When I bought a Downey SBC conversion kit back in’96, adapter plates were listed on the Catalog but they were no longer available.

Could be one of theirs or home brew

 

[Mark W]

What you have there is the OEM H42 and OEM transfercase. It is mated to a GM cast iron bellhousing of the same approximate vintage or earlier. The adapter is one of the old school plate adapters which were the only option until the adapter bellhousings came onto the market.

No mystery here. Just older stuff that a lot of guys have not seen.


Mark...

 

[pbgbottle]

Downey off road made an adapter like that I had it. One versions with dowel pin alignment an older version that centered in the bellhousing hole. Both used a modified bearing retainer. To accept a Chevy TO bearing. Along with using the Chevy clutch fork.

 

[pbgbottle]

Here is your adapter I posted this in another thread somewhere. Top two pics of later version with dowel pins
Catalog pics no dowel pin alignment uses bearing retainer to align tranny and clutch disc.
,,

 

[bikersmurf]

Given that it looks like you have a stock Toyota slave and likely the master cylinder is also stock, you’ll need a low profile diaphragm type clutch.

@pbgbottle knows you combination better, and I’m hoping he can confirm a couple things. In ‘96, when I swapped in a 350 using a Downey 360 degree aluminum conversion bel housing I went shopping for a, “Standard 11” low diaphragm Chevy clutch”. After much searching I bought a spare 2F clutch in and set it down on front of an older and wiser parts guru. I used the above description and said it should look a lot like this one.

Off the top of his head he couldn’t recall the “new part number”, but wandered into the back and came back with an 11” LUK clutch for a 1970s inline 6 or something of the sort. Unlike everyone else, he didn’t look in the computer, didn’t need a year make and model, and didn’t care it was going in a Toyota that had a ‘69 motor, ‘85 flywheel, and a ‘74 Toyota 4 speed. 28 years later it has outlasted the first SBC, and is still going strong.

I believe you’ll either need a LUK 11” low diaphragm clutch, or a Centerforce Chevota clutch from @Downey.. Back when I did my conversion in ‘96 options were limited & I made it work with my July’74 clutch master, stainless steel braided line, and ‘74 slave. That said, I have seen countless people have issues, and been told it shouldn’t have worked so well. Since you also have a ‘74 it should work fine for you, but the Centre Force clutch works with less travel.



One last thought… if your adapter plate doesn’t have alignment dowels or some other way to accurately align the transmission to the clutch, you may wish to switch to a conversion bell housing. They do come up in the classifieds now and then, and compared to everything else 40 series… they aren’t a fortune new.

 

[pb4ugo]

You can remove the inspection cover to get an idea what's inside, but you'll most likely need to pull the tranny and clutch to ID the parts you need. My guess it has all chevy components inside the chevy bell housing.

 

[zebrabeefj40]

Do you have any idea who made this? I spoke to Advance Adapters and they seem to think that it was not a Toyota transmission and mentioned that they did not make it. They had mentioned that it could be Danny Warden?

Looks like some of the other "old dudes" answered your question.

 

[Mark W]

You can use a plain jane chevy clutch and skip the oddball stuff if you swap out you clutch master for one of the old single circuit brake master cylinders. These move more fluid than the clutch master and will give you the travel that you need for the Chevy clutch, albeit with a slightly heavier clutch pedal. Not what any of us old hot rod guys would consider heavy, but if you take a lot of soy in your latte... maybe?

Mark...

 

[pb4ugo]

I run all chevy stuff with my sbc/sm420 and use the stk later model FJ40 slave and master with no issues. I made sure I'm getting the slave and masters full stroke. Imo, it's pedal resistance is light to medium.

 

[Mark W]

I run all chevy stuff with my sbc/sm420 and use the stk later model FJ40 slave and master with no issues. I made sure I'm getting the slave and masters full stroke. Imo, it's pedal resistance is light to medium.

Yep, you can most certainly use the original setup. I just had several people years go who did not like the long stroke and low engagement. Not overly fond of it myself. So we looked to see what could be done. Over time it just became my default approach.

Mark...

 

[Downey]

Ok, I'll jump in- - -That was the first version of the Downey 4 speed adapters for using stock Landcruiser 4 speed with a sbc engine. We use to buy 100 Chevy bellhousings at a time to make those adapters. Ultimately the bellhousings started dwindling in availability, sometimes only receiving 4-5 bellhousings at a time, not worth setting up the machinery. Soooo we switched to a Downey 360 degree cast aluminum design, very strong, very available until we closed Downey in 2009. Clutch wise, we use to make "Chevota Specific" clutched that required the least amount of travel (at the T.O. bearing to disengage the clutch), I kept selling those clutches even after I closed Downey, until my cost went so high I could no longer sell them. Today the second best choice is the 11" LUK low diaphragm, it just barely eekes by with enough travel to disengage the clutch using the stock Landcruiser hydraulics.

 

[pb4ugo]

Yep, you can most certainly use the original setup. I just had several people years go who did not like the long stroke and low engagement. Not overly fond of it myself. So we looked to see what could be done. Over time it just became my default approach.

Mark...

When you use the single circuit brake master do you still use the stk 40 slave?

 

[Mark W]

When you use the single circuit brake master do you still use the stk 40 slave?

Yep. The stock slave has plenty of travel if you can push a little more fluid to it. The single circuit brake master has a larger bore, so the same pedal travel pumps more fluid to the slave. And before anyone asks, it does not push too much/over extend the slave.

Mark...