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Unread 05-10-2017, 09:27 AM   #1
bahndrvr
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Default Gear Ratio's between Models for upgrades etc

Alright,

Some initial research, will update as I go:

This is just due to me wanting to do Gear swap as cheap as possible and possibly stay with all stock Toyota parts - initial looks like could get a 05-07 Tundra front Chunk with 4.30's that will bolt in to our 03-09 4Runners and make later gear changes cheaper, they also have 3.90's and 4.10's but I would want most gear possible. To match that the rear 00-06 Tundra rear axle has 4.30's, and the additional width which would be nice for those running Long travel, just don't know if our ATRAC would work on the Tundra axle, will update as I find out. FJ Cruiser 07-09 is direct swap but highest is out of the manual tranny and 3.90's but could have matching front and rear for about the cost of the new carriers if you are patient, I will be lol. WMS is something I'm seriously considering as I will do SAS or Long travel in the front and would love the wider rear axle, for the time being would be spacers in front and removed in the rear once the swap was made and if did a tundra axle from 07 up would have to figure out whats required to get to match our 6 lugs, in the past did swaps and wasn't that hard for the wheel pattern. Now I'm looking to see if the rear chunks from 3rd Gen Tacoma's will bolt in to existing axle's as could get a Tacoma rear with 4.30's and even some rare 4.56's from what I'm reading and get that with an E-locker already and just have to modify the rear housing... I'm ultimately looking for the cheapest matching front to rear setup that I could just drop in. I will not be going front locked initially, but if I could get a rear e-locker rear chunk with 4.30's for cheap from a junkyard, even the whole axle I could do this cheap and even sell a rear housing etc.


If you have done your own research and have info please throw it in here I'll compile it all up, I can say that we have a lot of the Stock 07 + Tundra's in the junkyards here with the larger Rear axle and what I belive is the 10+" ring gear which would be a lot stronger and would be a perfect match to the front long travel, but haven't found out if ATRAC works on it, or really anything yet, would require welding obviously as they are leaf springs but that's cheaper than a full new gear setup, and from initial reading you can get those with 4.56's and E-locker but haven't found a definitive post on that matter yet.


Tundra

4:30
'00-'06 Reg cab/access cab 4wd V6

Need to research and see if the ATRAC II in our 4Runners would work with the Tundra axle, and most I'm seeing are Drum brakes, but will have to research and see if our brakes could adapt easily.

07-09
FJ Manual with E-locker
Same setup as our buts the manual comes with 3.91, have seen these as low at 450 in local yards, that's pretty much the price of a carrier and personally I would just switch it out and have the 3.90's which would save me the money for the gear swap to 4.56's or 4.88's.


Some other info for the front - as I would be trying to match the 3.90's


'03+ 4runner, '05+ Tacoma, FJ Cruiser, '05-07 Tundra 8" IFS diff.
- Driver's side
- Mid-pinion
- Clamshell housing
- 30 spline axles
- Carrier break: 3.91 and up, 3.73 and down.

"The front differential is an 8" mid pinion IFS that uses a gear It is the same as the Non-US Toyota Prado front differential.



'86-95 4cyl Turbo and V6* trucks and 4runners, and ALL '96+ 4Runners use the Toyota 8" 4-pinion differential in the rear. This diff is known as the "V6/Turbo diff."
- Stronger housing than the 4cyl diff
- Larger carrier bearings than the 4cyl diff
- 30 spline axles
- 27 spline pinion (pre-'96)
- Ten 10mm ring gear bolts
- 8mm axle housing studs with 12mm nuts
- 4-pinion carrier (case)
- 4cyl 8" diff carriers (cases) do not fit without custom carrier bearing adapters ($), try Inchworm Gear
- A few pre-'96 V6 trucks and 4runners have been found to have come with the 4cyl style diff from the factory. Nobody knows why.
* LPH/SPH gear info: http://www.pirate4x4.com/forum/showp...3&postcount=73

'96-up 4runner V6 diffs:
- new improved housing that looks the same as the T100/Tundra/Tacoma diff on the outside, internals are all the same as the regular V6 diff
- 30 spline pinion on OEM gears, swap pinion flange to 27 spline to use aftermarket gears



07+ Tundra and Sequoia's 5-LUG!

The massive 10.5-inch Tundra rear ring gear, comparable to a 14-bolt or Dana 70. The big axles were offered with both 4.10 and 4.30 ring-and-pinions. Since most are found with the tow package, the majority will be 4.30:1. The smaller 9.5-inch diff is available with 4.10 and 3.90 gears, again the lower with the tow package. We like that this low-pinion axle is not extremely low like a 14-bolt or a Ford 9-inch. This results in a higher rear driveshaft, less heat created by the gear engagement, but slightly less pinion-to-ring-gear-teeth engagement due to less hypoid drop.

•T100 front IFS~ 65", rear axle~ 66.75"
•Tundra front/rear~ ??
•'90-97 Landcruiser FJ-80/FZJ-80 front axle~ 63.5"

* Another tidbit: 2wd 4runners, Tacoma PreRunners, T100's, and Tundra's use 6-lug wheels- same as the 4x4's
(the other 2wd's use 5-lug)

Toyota 8" IFS Clamshell Front SD20B

Toyota 8" IFS Front found in late model Toyota trucks and FJ Cruisers


Ring Gear Diameter: 8.000
Cover Bolts:
Ring Gear Bolts: 10
Spline Count: 30
Dropout: True
Pinion Support: False
Carrier Breaks: 3.73/ 3.90
Rear Suspension:
Pinion Nut Size: 30mm

Compatible with Models:

4Runner: 2003 - 2014 (Front) FJ Cruiser: 2007 - 2014 (Front)
Tacoma: 2005 - 2015 (Front)




Pirated some info from my old buddy Eric B - we were T100 owners back in the day and communicated a ton back on 4x4Wire specidically trail talk, but it's a relatively dead forum for Toyota's now, tons of info if you search the archives though.


Will edit in more info that's applicable as I come along it - there are plenty of other ratio's but these are the only ones I'm interested in, will look at the GX470's now as well.

Here is a link with some good info: http://www.lcengineering.com/LCTechP...ARJANUARY.html
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2003 4Runner SR5 v8 -
Temp Front: Top hat spacer 2.5" on Tacoma struts/springs
Rear: TJM/King heavy extended Tacoma shocks, internal snorkel, etc.
315 BFG AT KO2's (35's) - Other stuff done, 6th 4Runner

2014 Wrangler Unlimited Sahara - Wife's

Last edited by bahndrvr; 05-10-2017 at 10:36 AM.
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Unread 05-10-2017, 09:45 AM   #2
bulldog
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On the 120/150 side.

Most have the 3.73 gears.
The earlier V6 4Runners had 3.91 gears with the 4spd auto box.
Some Tacomas had 4.10s.

Olders gens seem to have 4.56 and 4.88, I think 5.29s were only aftermarket.
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Unread 05-10-2017, 10:38 AM   #3
bahndrvr
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Quote:
Originally Posted by bulldog View Post
On the 120/150 side.

Most have the 3.73 gears.
The earlier V6 4Runners had 3.91 gears with the 4spd auto box.
Some Tacomas had 4.10s.

Olders gens seem to have 4.56 and 4.88, I think 5.29s were only aftermarket.
Yeap, I'm looking for relevant info for direct swaps with our existing clamshell front - Toyota 8" IFS Clamshell Front SD20B

Ring Gear Diameter: 8.000
Cover Bolts:
Ring Gear Bolts: 10
Spline Count: 30
Dropout: True
Pinion Support: False
Carrier Breaks: 3.73/ 3.90
Rear Suspension:
Pinion Nut Size: 30mm

Compatible with Models:


4Runner: 2003 - 2014 (Front) FJ Cruiser: 2007 - 2014 (Front)
Tacoma: 2005 - 2015 (Front)

are direct bolt in - out of the compatible fronts the Tacoma has some 4.30's for direct swap in, but they are hard to find, so from initial best bet is to find a 3.90 setup for the front and end up paying only for the front gears, HOWEVER it's hard to find 4.30's to setup the front to match the rears that you can directly drop in without going directly through Toyota and the would defeat the purpose of this as it would cost as much for stock 4.30's for the front as would aftermarket front and rears lol.....

Also I'm seeing this "brains" page referenced often but at work I can not access his site, will look later and probably edit some more info in - already had to cut quite a bit as post is limited to 7000 characters, so will scrub the info and cleanup later as I have time I also had not seen the info you threw in on the 3.90's for the 4 speed v6 4Runner, those are pretty common in the yards here, that would proably be my cheapest way to get front and rear setups could probably score front and rear chunks complete with the 3.90's for the price of one new carrier for the 3.90+ setup required for gear changes to 4.56's and 4.88's.
__________________
2003 4Runner SR5 v8 -
Temp Front: Top hat spacer 2.5" on Tacoma struts/springs
Rear: TJM/King heavy extended Tacoma shocks, internal snorkel, etc.
315 BFG AT KO2's (35's) - Other stuff done, 6th 4Runner

2014 Wrangler Unlimited Sahara - Wife's

Last edited by bahndrvr; 05-10-2017 at 10:42 AM.
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Unread 06-25-2017, 09:03 AM   #4
danthemanx07
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Quote:
Originally Posted by bahndrvr View Post
Alright,

This is just due to me wanting to do Gear swap as cheap as possible and possibly stay with all stock Toyota parts - initial looks like could get a 05-07 Tundra front Chunk with 4.30's that will bolt in to our 03-09 4Runners and make later gear changes cheaper, they also have 3.90's and 4.10's but I would want most gear possible. To match that the rear 00-06 Tundra rear axle has 4.30's, and the additional width which would be nice for those running Long travel, just don't know if our ATRAC would work on the Tundra axle, will update as I find out.

Tundra

4:30
'00-'06 Reg cab/access cab 4wd V6

Were you ever able to confirm whether the Tundra 4.30s came in an 8" clamshell? I thought they were a 7.5" like the 4runners and Tacomas of the same vintage.
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Unread 06-26-2017, 07:22 AM   #5
bahndrvr
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Quote:
Originally Posted by danthemanx07 View Post
Were you ever able to confirm whether the Tundra 4.30s came in an 8" clamshell? I thought they were a 7.5" like the 4runners and Tacomas of the same vintage.
I didn't look into that but easy way to tell is to just go to like Randy's ring and pinion and build the front Busy today otherwise would do it, may try to this evening if I get a chance.
__________________
2003 4Runner SR5 v8 -
Temp Front: Top hat spacer 2.5" on Tacoma struts/springs
Rear: TJM/King heavy extended Tacoma shocks, internal snorkel, etc.
315 BFG AT KO2's (35's) - Other stuff done, 6th 4Runner

2014 Wrangler Unlimited Sahara - Wife's
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Unread 06-26-2017, 09:10 AM   #6
danthemanx07
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Quote:
Originally Posted by bahndrvr View Post
I didn't look into that but easy way to tell is to just go to like Randy's ring and pinion and build the front Busy today otherwise would do it, may try to this evening if I get a chance.
Took a look. Tundras used the 7.5" as well. I don't think 4.30s were found in any 8" front diffs as much as I wished otherwise.
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