Author Topic: AZ Rockit: 85 4Runner 3rz R151F Dual MC cases 244:1 37s  (Read 650 times)

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AZ Rockit

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AZ Rockit: 85 4Runner 3rz R151F Dual MC cases 244:1 37s
« on: Aug 19, 2018, 06:35:34 AM »
During January 2017, my son informed me that a well established and capable 85 4runner was for sale in Washington State. This truck had done the Rubicon, Moab, Fordyce and other known difficult trails. Looked like a great offroad/hunting/fishing truck, but before I could digest all the information from 300K, the truck was sold to another guy living in the Seattle area. Most of you knew this truck as Old Red. Here is the build page link.

SqWADoosh's 85 Runner Build Thread

About 7 months later, this truck was for sale again and bestgen posted the craigslist ad to the MC forum. As I recall, in less than a couple hours we contacted the seller and had a deal to purchase the truck for $10,500. A few days later, during August 2017, 300K and I flew to Seattle, bought the truck, drove to H8PVMNTs place in Montana for a visit and to show off our lady, and then drove home to Tucson. Old Red was great. MTR 37's rode like a car tire at 80 mph. 300K wrote a thread.

Old Red makes it to Arizona! 5 states in 2 days!

We didn't do much to restore/improve Old Red for offroading, but we did make some minor improvements.

1. Bought a new battery (the existing battery had a 2010 sticker....must be nice living in a cooler climate...ours die in 2 years or less in AZ)
2. Added an electronic temp gauge (because the stock analog doesn't move much and we have a HOT climate and a low mileage 3rz)
3. Restored the back tail gate cover that was flopping around
4. Bought a new V6 radiator for the hot climate (not yet installed)

And then we wheeled around Charouleau Gap and Sutherland Trail in Tucson, AZ for the next 6-9 months.

Then, a few months ago, 300K pointed out a Zippo R151F transmission with MC dual RF1A dual cases at 2.28:1 and 4.70:1 in the rear, for a crawl ratio of 244:1. We needed another drive train for a 89 4Runner we purchased from H8PVMNT (Montana Runner--new build page coming) and Zippo was selling the transmission and dual cases at a great price; a unicorn drive train was up for sale and we needed another drive train, so we bought it. Best move we could have made because it lit a fire under Old Red which is why we changed her name to the AZ Rockit Here is the link to Zippo's stellar dual RF1A build.

For Sale - Another build by zippo

300K finished the transmission install 8/16/2018, and we started the transmission break-in process immediately. Completed the break-in at about 10PM on 8/18/2018.

Rundown of what we did. We didn't want to do much rock crawling until the R151F was broken in.

Day 1: 30 mile jaunt to a local burger shop for dinner.

Day 2: 20 miles pavement mostly in 4th and 5th gears; 60 miles of hilly, desert baja driving working 1st, 2nd, and 3rd through Redington Pass in AZ, and then we launched her from every stop light all the way home for the final 30 miles on pavement. (Caught a flash flood and did a bit of mudding on this trip. Was a mess to clean off this AZ mud. Peeled rock slider paint getting all of it off. Like concrete in less than 12 hours.)

https://aztrail.org/explore/passages/passage-10-redington-pass/

Redington Road, Tucson, AZ: caught the aftermath of a flash flood. Thought this bank was solid. Guess again. Had to do HI-LO 4x4 to escape.


Final mud paint job when we finished the Redington Pass run. Took 11 minutes of power washing to remove the AZ mud 12 hours later.


Day 3: 90 miles pvmnt driving up long, steep hills, in 3rd, 4th, and 5th near Mamouth, AZ; 50 miles of desert baja driving near Oracle, AZ; and then 250 miles of mixed pvmnt and desert baja to Lake Roosevelt, down the Apache Trail, and then home through Florence, where some of AZ's best rock crawling can be found. And we rock crawled one obstacle that scared the crap out of me. Pictures and video did not do justice.



We drove the new R151F transmission very hard and never had a problem. Zippo is King!

NOTE: we used lucas synthetic oil for the break-in. Upon consulting the MC Forum, 300K learned that Marlin recommends dinosaur oil for the tcase break-in because it assists the synchros in some way. Will post how/why when I know. 300K is calling Marlin today to request additional details regarding the break-in process.

Will post pictures of day 3 once I learn how to. We drove through some of the most beautiful Southern AZ terrain you will see. And the AZ Rockit was kicking out the jams with that 3rz and R151F. And on the mountain grades, we were cornering better than most cars. AZ Rockit is a nice truck. We baja'd her at 75 mph on the 3rd day.

So, we will be upgrading the AZ Rockit further with:

(1) unicorn rear seat delete (so we can drop the spare off the back and place it in the bed when crawling)
(2) SR5 gas tank we purchased on the trip to trailer the Montana Runner from H8PVMNT's place back to Tucson. The SR5 gas tank should add about 3 more gallons of gas.
(3) Add an exhaust line thermal wrap where it passes under the transmission.
(4) Add thermal padding over the transmission tunnel in the cabin.
(5) Install V6 radiator

Drivetrain Installation:

300K worked the deal with Zippo, did all the installation work, and most of the break-in driving. I provided some muscle and $$$$ as required for tools and consumables. We bought a cherry picker and transmission jack from HF. Both were on 20% off deals, so that was nice. Will need both again for the 4 trucks now relaxing in our yard. We bought a Milwaukee Impact wrench and were glad we did. Here were the tasks at hand, sort of.

1. Find new Bell Housing for the 3RZ/R151F configuration
2. Extend the reverse light switch cable ~16 inches
3. Find clutch fork boot (took from 300K's 84PU)
4. Find T/O bearing (took from Old Red's drivetrain)
5. Modify the tunnel to accept R151F transmission (had to cut a 2x2 inch slot at the front of the tunnel. Of course the build included a short throw shifter or the R151F would not fit. Also, following the breakin process, the tunnel had been deformed and needed to be cut again.)


Drivetrain at Fastenal. About $200 from WA to AZ.                                       


Drivetrain was nicely packaged by Zippo


Probably will not get this entirely right, but Zippo had setup the drivetrain for a 22R application which means the bell housing had to be replaced. We purchased a 22RET to R151F bell housing online. Believe it was $250 shipped.

22RET to R151F on left; 2TR-FE to R155F on right.



« Last Edit: Aug 20, 2018, 05:53:00 PM by AZ Rockit »
85 4runner, 3rz, R151F, 244:1, 37s
84 PU Truck chassis, 85 excab, blown 22r engine, chevy rear springs, 31s
85 PU LB, blown 22re, donor truck for Montana Runner (3rds) and 84 PU (W56)
89 4 runner on a 94 PU chassis (Montana Runner), no drive train, 3rds, or engine

Toy(Yota)

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Get pics up, can’t wait to see the updates. Always loved that truck.
1985 4runner, 88 body, trussed, locked, single 4.7s and twin stick. Cool paint and 35” Baja Claws

bigarms23

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why not swap a f150 tank in there nice 4runner btw
88 4runner 92 cpi duals 37 radial rockers and 4.8 coming soon

Dingman.

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In on page one!  :eye:

Rockcrawlintoy

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AZ Rockit [OP]

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why not swap a f150 tank in there nice 4runner btw

Hey bigarms23: 300K wanted to keep everything Toyota (except rear chevy springs on his 84PU). Thanks!
85 4runner, 3rz, R151F, 244:1, 37s
84 PU Truck chassis, 85 excab, blown 22r engine, chevy rear springs, 31s
85 PU LB, blown 22re, donor truck for Montana Runner (3rds) and 84 PU (W56)
89 4 runner on a 94 PU chassis (Montana Runner), no drive train, 3rds, or engine

bigarms23

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ok just make a skid plate for that tank but I may run a chevy motor but still rocking the Toyota tank
88 4runner 92 cpi duals 37 radial rockers and 4.8 coming soon

:)bestgen4runner

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SqWadoosh :therethere: Me
I am 1/5th of Perfect Fit
SqWADoosh [04:19 PM]: *sigh* I guess Chris is right and I just need to wait until I'm in a place where I have a tow rig and trailer before I get this caliber of truck
Mudder [08:28 PM]:   not try to be a jerk, but are you serious bestgen?
Prismo [06:11 PM]:   Done, time to relax or as Bestgen says....FREEDOM!
HogCanyonHopper [06:54 PM]:   I like my little rod. it gets the job done
H8PVMNT [03:30 PM]: I can go both ways.

AZ Rockit [OP]

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85 4runner, 3rz, R151F, 244:1, 37s
84 PU Truck chassis, 85 excab, blown 22r engine, chevy rear springs, 31s
85 PU LB, blown 22re, donor truck for Montana Runner (3rds) and 84 PU (W56)
89 4 runner on a 94 PU chassis (Montana Runner), no drive train, 3rds, or engine

AZ Rockit [OP]

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ok just make a skid plate for that tank but I may run a chevy motor but still rocking the Toyota tank

bigarms23: please explain further about the skid plate? Not needed for an F150 gas tank? Thanks!
85 4runner, 3rz, R151F, 244:1, 37s
84 PU Truck chassis, 85 excab, blown 22r engine, chevy rear springs, 31s
85 PU LB, blown 22re, donor truck for Montana Runner (3rds) and 84 PU (W56)
89 4 runner on a 94 PU chassis (Montana Runner), no drive train, 3rds, or engine

THK Matt

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Toy(Yota)

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Always loved that truck!
1985 4runner, 88 body, trussed, locked, single 4.7s and twin stick. Cool paint and 35” Baja Claws

AZ Rockit [OP]

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Always loved that truck!

Yep, nice truck. Thanks. Here are some shots during drive train break-in.



































85 4runner, 3rz, R151F, 244:1, 37s
84 PU Truck chassis, 85 excab, blown 22r engine, chevy rear springs, 31s
85 PU LB, blown 22re, donor truck for Montana Runner (3rds) and 84 PU (W56)
89 4 runner on a 94 PU chassis (Montana Runner), no drive train, 3rds, or engine

:)bestgen4runner

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That last picture looks like a cool spot.  :thumbs:
Thanks for the pictures.
I am 1/5th of Perfect Fit
SqWADoosh [04:19 PM]: *sigh* I guess Chris is right and I just need to wait until I'm in a place where I have a tow rig and trailer before I get this caliber of truck
Mudder [08:28 PM]:   not try to be a jerk, but are you serious bestgen?
Prismo [06:11 PM]:   Done, time to relax or as Bestgen says....FREEDOM!
HogCanyonHopper [06:54 PM]:   I like my little rod. it gets the job done
H8PVMNT [03:30 PM]: I can go both ways.

300k

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That last picture looks like a cool spot.  :thumbs:
Thanks for the pictures.

I liked that spot.

 
                                                                       

YouTube - going up

                                                                                         
 
Keep it TOYOTA!

In the past years, I used to get a lot of calls from Jeep owners wanting to go slow like the Toy trucks.

 
 
 
 
 

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