Hello tshoe7 and
![Welcome :welcome:](https://board.marlincrawler.com/Smileys/marlin/welcome.gif)
to
![Marlin Crawler Turtle Logo :turtle:](https://board.marlincrawler.com/Smileys/marlin/turtle.gif)
land!
That is a pretty cool project! Here is the very first Tundra in the world to ever have Dual Cases:
http://board.marlincrawler.com/index.php?topic=2398![](http://board.marlincrawler.com/index.php?action=dlattach;topic=2398.0;attach=294;image)
I've seen the rig a few times on the trail and it has grown up and become even larger than this old pic of it above. The width is great from the Tundra platform, so long as you can fit it through your favorite trail
![Thumbs Up :thumbs:](https://board.marlincrawler.com/Smileys/marlin/thumbs.gif)
To convert all you need to do is find a 1995-2004 Tacoma V6 5spd 4WD transmission and t/case. Assuming you are here to turn this beast into a Crawler, then take a look at our
3.4-liter t/case conversion adapter plate which will convert the bolt pattern at the tailhousing of the Tacoma 4WD transmission to accept the bolt pattern of a 1979-1995 4cyl gear drive transfer case, which is what the entire world of Toyota Rock Crawler is founded upon. Then from there you can use a single (or dual, or triple, or quadruple, et cetera)
top-shifting gear drive transfer case with our
23-spline Heavy Duty Total-Spline turbo input gear (will be back in stock soon) to complete the conversion for a very reliable setup.
To go duals all you'll need is our MC07 adapter plate, check it out here:
http://www.marlincrawler.com/transfer-case/dual-adapters/dual-case-kit-mc07-xd, also as a fully built ready to bolt-in, add gear oil and go setup as shown here,
http://www.marlincrawler.com/transfer-case/line-ups/dual-tcases/dual-hilux/dual-case-complete-v6, however currently these are only available via call-in ordering.
Sorry, I have gotten carried away and need to bring something else up (I don't want to delete what I've typed above).
The first decision you need to do is determine what side your front axle's third member will be on. Your rig is 2WD now, so you're gonna need to do a Solid Axle Swap (or install a factory Toyota 4WD IFS
![Yup yup :yupyup:](https://board.marlincrawler.com/Smileys/marlin/yupyup.gif)
).
Passenger Side DropIf you use a front axle that will have the front driveline on the passenger's side, then the links I posted above are what you need: You'll need to run a 23-spline version of the 1979-1995 4cyl Gear Drive Transfer Case. Can be done as a single or dual t/case (or triple, etc). With a single case setup, you have the option to use our 4.70:1 low range gear set which will take you to about a 80:1 to 100:1 Crawl Ratio. Click here for info on the original Crawler Gears:
http://www.marlincrawler.com/transfer-case/line-ups/single/4701-xd-gear-kit In a Dual Case setup, you can go from about 100:1 with stock 2.28:1 gears, or about 450:1 with dual-4.70s (if desired). Triple cases can get you down to around a 2,200:1 Crawl Ratio if you really want to be stupid
Driver Side DropIf you use a front axle that will have the front driveline on the driver's side, then you'll have to go about it a differently: You'll need to run a 1995-2004 Tacoma 6cyl Chain Drive Transfer Case. This can be done by using a 3.4-liter 4WD 5spd transmission with its stock/original chain drive t/case attached, and you're done. Your final drive ratio will be around 30:1 - 50:1 depending on your axle gearing. If you want to do some actual Rock Crawling, then you will need to splice in a low range reduction unit from the same 1979-95 4cyl t/case, what we call a "Crawl Box", between the Tacoma transmission and transfer case. The result will be Transmission > Marlin Crawler Low Range Unit > Stock Chain Drive T/case. This setup can take you to about a 100:1 with stock gears or about 240:1 if the Crawl Box has our 4.70:1 gears linked above. Take a look here for a lot more info on this:
http://www.marlincrawler.com/transfer-case/line-ups/tacoboxThere is more to discuss but please reply back and let us know more about your plans
![Thumbs Up :thumbs:](https://board.marlincrawler.com/Smileys/marlin/thumbs.gif)
What axle you might run and what you plan to use the truck for
![Driving :driving:](https://board.marlincrawler.com/Smileys/marlin/driving.gif)
For custom axles I
highly recommend USA-made Diamond Axles,
http://www.diamondaxle.com/index.htm, or USA-made Ruff Stuff axles,
http://www.ruffstuffspecialties.com/catalog/AxleHousings.html. Diamond Axles is the original custom axle, dating back to the turn of this century and are built complete with your knuckle ball ends of choice. Ruff Stuff on the other hand, as far as I know, only builds the housing with bare tubes; You'll have to figure out your own caster and weld on your own ball joints. Because Diamond is one of the original companies who helped define what Toyota Rock Crawling is today, and because they offer complete axles that don't require any modification, I recommend giving them a call first
![Thumbs Up :thumbs:](https://board.marlincrawler.com/Smileys/marlin/thumbs.gif)
Looking forward to watching your truck transform into a 4WD Tundra!
![Beer Chug\'n :beerchug:](https://board.marlincrawler.com/Smileys/marlin/beerchug.gif)
Regards,
BigMike