Adventures in 4Runner'ing

[DouglasVB]

The tires are about 34" currently (tire wear, etc). No RPM gauge in this truck (yet! probably will put in a SR5 cluster at some point). I'll play around with the math later when I have some time to puzzle through it a bit.

 

[DaveInDenver]

The tires are about 34" currently (tire wear, etc). No RPM gauge in this truck (yet! probably will put in a SR5 cluster at some point). I'll play around with the math later when I have some time to puzzle through it a bit.

34" adjustments, 3rd gear, 1500 RPM
2.28 is 9.1 MPH
4.70 is 4.4 MPH
Double is 1.9 MPH

You can estimate RPM well enough by ear, it's the relative changes that are important.

34" with 3rd gear, 2000 RPM
2.28 is 12.2 MPH
4.70 is 5.9 MPH
Double is 2.6 MPH

If you want do idle, 800 RPM, 1st gear. GPS might be accurate enough but I'd probably do it by time, number of seconds to travel distance across your parking lot.

1 MPH is 1.46667 FPS

2.28 is 1.6992 MPH (2.4922 FPS)
4.70 is 0.8243 MPH (1.2090 FPS)
Double is 0.3615 MPH (0.5302 FPS)

 

[DouglasVB]

T-case stuff:

Okay here's a new video: https://youtu.be/iFQOUSfkZ6A (all in 1st gear this time!)

In Low-Low, I was idling along slightly uphill at 0.6 MPH according to my GPS. In Hi-Low (only rear T-case engaged), I was idling along at 1.1 MPH. In Hi-Hi, I was barely able to keep it idling along at 2.8-ish mph. I replicated this in a different parking lot on a very slight downhill slope with the same speeds.

I'm kind of thinking maybe I don't have 4.7:1 gears in this truck? Looking at this video (https://www.youtube.com/watch?v=yEoY1RCbWas) where they claim to have a dual 2.28:1 setup, that's more the speed my truck felt like it was going today.


Cooling system:

Tonight I didn't have time to check the cooling system for leaks (and check if the hood hits the cap). I'll do that tomorrow night.

Oil leaks:

I think maybe I didn't solve all of the oil leak from the engine. Need to look at it more closely and on level ground. For sure the rear T-case leak needs to be addressed before I drive this truck on the freeway. That leak is really bad. The oil slinger plate has arrived and I will install it this weekend.

Seat:

I did manage to fix the seat tonight by using the existing broken cable and modifying it. It will work for this summer anyway. I am going to need to track down an OEM cable at a junkyard at some point in the future or build my own cable.

 

[DouglasVB]

I checked the coolant system tonight. The new radiator cap I got is faulty. It releases pressure at about 3PSI. So that's no good. The old cap pressurizes right up to 16 PSI. I adjusted the hood stops to hopefully lift it up a bit so the cap won't hit the lid (I think that might have been happening, as Bill suggested). The old cap still should be replaced though because the rubber is cracking.

Haven't had time to do any additional checking on the T-case or the engine oil leak. Hopefully I'll be able to start working on the T-cases tomorrow evening.

Anyone have any thoughts on if I actually have 4.7:1 gears in the truck?

 

[DouglasVB]

I checked the coolant system tonight. The new radiator cap I got is faulty. It releases pressure at about 3PSI. So that's no good. The old cap pressurizes right up to 16 PSI. I adjusted the hood stops to hopefully lift it up a bit so the cap won't hit the lid (I think that might have been happening, as Bill suggested). The old cap still should be replaced though because the rubber is cracking.

Haven't had time to do any additional checking on the T-case or the engine oil leak. Hopefully I'll be able to start working on the T-cases tomorrow evening.

Anyone have any thoughts on if I actually have 4.7:1 gears in the truck?

 

[J Kimmel]

Just get it in the dirt and don't worry about the gearing. It doesn't really matter as you don't know how to drive it yet anyhow. Play with it and see what works for you and report back.

 

[DouglasVB]

Might this be the radiator cap I've been searching for? http://www.yotashop.com/radiator-cap-large/

Not sure how to measure to see if it is correct or not though.

 

[DouglasVB]

Just get it in the dirt and don't worry about the gearing. It doesn't really matter as you don't know how to drive it yet anyhow. Play with it and see what works for you and report back.

I need to do work on the T-cases anyway and don't want to have to open the t-cases up again this summer. Would rather do it all at once rather than in parts. Plus I have all of the parts necessary to put in 4.7 gears sitting in my garage.

 

[DaveInDenver]

Just get it in the dirt and don't worry about the gearing. It doesn't really matter as you don't know how to drive it yet anyhow. Play with it and see what works for you and report back.

So true. Double 2.28 cases is a 5.2 ratio and that's plenty low to get in a lot of trouble.

 

[ScaldedDog]

Somebody has to be the contrarian...

Since you everything you need sitting there, and you're going to have the cases apart anyway, you may as well have the 4.70 gears. There are two big "ifs", though:

1) You know what you are doing, or have a step by step guide from Marlin.

2) You're OK with whatever spline count you find inside the thing.

Mark

 

[Notyourmomslx450]

when you're ready to sell the 4.7 set you have in the garage I'd be happy to buy it off you. I have dual stock and miss the dual ultimate....

 

[DouglasVB]

Somebody has to be the contrarian...

Since you everything you need sitting there, and you're going to have the cases apart anyway, you may as well have the 4.70 gears. There are two big "ifs", though:

1) You know what you are doing, or have a step by step guide from Marlin.

2) You're OK with whatever spline count you find inside the thing.

Mark

I have the Marlin guide and have been studying it. I think I even have a press lined up at work that I can use this weekend. Good question on the spline count. My suspicion is that these are two stock T-cases that were put together with a 21 spline adapter. I can definitely work with that.

I'm considering using the spare T-case sitting in my garage and building it up with the 4.7 gears before dropping out the T-cases in the truck. That way if I run into problems, I won't have a truck marooned in my garage for an extended period of time.

 

[ScaldedDog]

That's a great idea. When I broke my 4.70 gearset, I replaced the whole rear case as it made the swap really simple. Since you seem to know a thing or two about scope creep , building that case out of the vehicle is a quick way to upgrade to 30-spline outputs, too.

Mark

 

[DouglasVB]

I worked on getting the T-cases dropped from the truck last night. Should have them out this morning after breakfast.

One thing I noticed right away... there's a HOLE in the side of the front T-case! Maybe a bolt that was too long was tightened down and popped a hole in the side of the case? Once I have the T-Case out, I'll take a picture. The hole is the size of a dime. Doesn't look like any oil has come out that way but I'll verify before reassembly.

I also think I found the source of my "engine oil" leak... it appears to be from the top shift boot on the transmission. That rubber boot is all torn up and there's a nice stream of transmission fluid from there down to where I thought I was having an engine oil leak. Hopefully Stevinson has that part in stock.

 

[DouglasVB]

The hole is only through the outside of the case into one of the bolt holes. It doesn't penetrate the case. Looks like it shouldn't be a problem.

I determined that this is in fact a dual 2.28:1 case setup. There is no 4.7:1 gear in it. Good thing I have one sitting in my parts box!

 

[DouglasVB]

GEARPOCALYPSE NOW

 

[DouglasVB]

I'm now working on clearancing the housing for the 4.7:1 gear, grinding off the half inch of extra material on the shift rod, etc. Looking like I'll have the t-case back together this evening and either tonight or tomorrow morning I'll have it back in the truck.

 

[Townsend]

Hey man - just saw that she didn't have 4.7:1 after all. Hope you know I'd never intentionally mislead you. Without pulling it apart or knowing what that gearing difference should feel like, I'm nowhere near knowledgable enough to know the difference...a little P.O.'d the P.O. mislead me to be honest.

 

[DouglasVB]

Haha no worries! I looked at the original ad you had and he was tricky with his words. He did say it had dual cases but didn't say it had 4.7 gears. Good thing I had the gears sitting in my garage already.

I also found the front pinion seal was leaking. Will get that replaced before I reinstall everything. Will also replace the torn transmission shifter boot. Also the rear t-case output seal. Thinking about doing the transmission rear seal while I'm at it since it's accessible now. Also I have the oil slinger plate for the top of the rear t-case.

Now back to grinding out the clearances on the rear t-case...

 

[DouglasVB]

Hmm so this isn't good. I can't find the 4.70 low speed gear that goes onto the main shaft in the stuff that came from Marlin Crawler. I'll tear through everything again tomorrow to verify but so far I haven't found this very crucial gear. The other two gears came and were where they were supposed to be. I definitely ordered the correct thing from Marlin as the digital receipt shows. This 4.70 gear HAS to be in my garage somewhere, right?