Author Topic: High Pinion swap into Series 2 4Runner  (Read 1296 times)

0 Members and 1 Guest are viewing this topic.

V8Runner_Oz

  • Offline Dusty Trails
  • *
  • Turtle Points: 0
  • Posts: 2
  • Member since Jan '17
  • Crawling with Marlin
High Pinion swap into Series 2 4Runner
« on: Jan 15, 2017, 11:01:03 PM »
Hi,
I've put a 1UZ into my 4Runner and recently blew my first diff (G255 axle - 4.56 ratio, LSD)
Looking to build a high pinion diff by using a diff centre from an FJ80 that I scored cheap.
Having trouble finding any information and Marlin customer support haven't replied to my emails (I'm in Aus so phone contact will be difficult)

I can't find much on the site to indicate if I need the standard V6 8" gears or if I need the FJ80 high pinion gears. My assumption is that the standard v6 8" gears need to be shoved into the FJ80 centre as it's facing the opposite direction as it was from factory. I also assume that I'd need a locker for the V6 8" to put into the housing (so it locks in the correct direction)
this page has some information, but not a lot: https://www.marlincrawler.com/differential/setup-kit/sk-hilux/toyota-8-4cyl

can anyone comment if this is the right shopping list for what I'm doing?
https://www.marlincrawler.com/differential/setup-kit/sk-lc/toyota-8-high-pinion
https://www.marlincrawler.com/differential/ring-pinion/rp-hilux/toyota-8-v6
https://www.marlincrawler.com/differential/parts/oil-slingers - STANDARD PINION?
https://www.marlincrawler.com/differential/locker/grizzly-locker/griz-hilux/grizzly-locker-8-6cyl
https://www.marlincrawler.com/differential/parts/solid-pinion-spacer-kit


Slabzilla

  • Offline Crawler Guru
  • ****
  • Turtle Points: 1083
  • Male Posts: 415
  • Member since Dec '13
  • Crawling with Marlin
Re: High Pinion swap into Series 2 4Runner
« Reply #2 on: Mar 22, 2017, 08:19:35 PM »
You'll require the High-pinion gears, as they are what is referred to as "reverse-cut" gears. The standard gears won't work in the H/P housing, they'll make your front end turn backwards. Sorry, just noticed your post.   :smack:  Your 2nd parts list looks about right.   :biggthumpup:
'85 Xtra-cab, 4.5" Downey Off-Road lift, 12-15 KM2's on American Racing Baja's, 4.10's, 4.7's, Downey Off-Road CAI, Marlin rear bumper & sliders

arlindsay1992

  • Offline Rock Crawl'n
  • **
  • Turtle Points: 423
  • Posts: 30
  • Member since Jun '16
  • Crawling with Marlin
Re: High Pinion swap into Series 2 4Runner
« Reply #3 on: Mar 23, 2017, 03:41:54 AM »
Standard rotation gears will not make the front end rotate backwards. That's not how it works. They simply will not fit at all.

Standard rotation means that in the normal configuration (used to drive the rear axle so pinion in front of the ring gear) force from the pinion is applied to the drive side of the ring gear. This is how the differential is designed and it's stronger that way. If you run a standard rotation diff up front (pinion behind the ring gear) then the pinion applies force to the coast side of the ring gear. This is a weaker setup.

The reverse rotation means that when the differential is installed in the front the force from the pinion is applied to the drive side of the ring gear which is stronger. If you install a reverse rotation in the rear then you'll be driving on the coast side which is weaker.

Standard rotation and reverse rotation actually has to do with the way the gears are cut. Notice when you look at the ring gear that the teeth all swirl one way. Well that's the difference between standard and reverse rotation, the teeth swirl the opposite way.

Keep in mind this is all pertaining to situations where you are driving forward. If driving in reverse then everything gets swapped.

Hope this clears things up so we don't have wrong information floating around.

arlindsay1992

  • Offline Rock Crawl'n
  • **
  • Turtle Points: 423
  • Posts: 30
  • Member since Jun '16
  • Crawling with Marlin
Re: High Pinion swap into Series 2 4Runner
« Reply #4 on: Mar 23, 2017, 03:47:03 AM »
Also, the terms are used a bit interchangeably but for our trucks low pinion is standard rotation and high pinion is reverse rotation.

Just to add to what I said, low pinions front and rear will give you a strong rear and weak front going forward and a weak rear and strong front going backward.

Low pinion rear and high pinion front will give you two strong diffs going forward and two weak diffs going backward.

High pinions front and rear will give you a weak rear and strong front going forward and a strong rear and weak front going backward.

knapp870

  • Offline Rock Crawl'n
  • **
  • Turtle Points: 0
  • Posts: 13
  • Member since Oct '17
  • Crawling with Marlin
Re: High Pinion swap into Series 2 4Runner
« Reply #5 on: Nov 28, 2017, 07:11:58 AM »
Also, the terms are used a bit interchangeably but for our trucks low pinion is standard rotation and high pinion is reverse rotation.

Just to add to what I said, low pinions front and rear will give you a strong rear and weak front going forward and a weak rear and strong front going backward.

Low pinion rear and high pinion front will give you two strong diffs going forward and two weak diffs going backward.

High pinions front and rear will give you a weak rear and strong front going forward and a strong rear and weak front going backward.


arlindsay1992  nailed it!! Second parts list

 
 
 
 
 

Related Topics

25 Replies
11630 Views
Last post Feb 08, 2011, 06:39:22 PM
by Sparkplug
4 Replies
1224 Views
Last post Sep 18, 2011, 10:18:49 PM
by Jaysen
2 Replies
843 Views
Last post Oct 22, 2011, 07:32:26 PM
by BoG-ToY
7 Replies
1070 Views
Last post Aug 26, 2013, 12:24:50 PM
by 4Roller
1 Replies
724 Views
Last post Oct 28, 2016, 11:54:33 AM
by kneedownnate