which dual case do i get?

85*4runner · 10-13-2009, 06:07 PM

Hi i have an 1985 toyota 4runner. I know it has a W-56 and a top shift t-case. I also know i need to get a 21 spline input but what output spline do i get. I am getting the line up from marlin crawler.

here is the link-

http://www.marlincrawler.com/transfe...ar-drive-tcase

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4Crawler · 10-13-2009, 06:22 PM

Your current case is 21 spline input, matches the transmission 21 spline output. The new reduction box would likely fit in between those two (obvious answer to your question), unless you want to change it and your current box to a 23 spline output/input.

85*4runner · 10-13-2009, 06:57 PM

I know the 23 spline is stronger but how much stroger? Am i likely to break a 21 spline? What is involved in changing it to a 23? What do i have to buy?

myyota · 10-13-2009, 07:08 PM

Unless you plan on beating the hell out of your truck, the 21 spline will be just fine.

muddpigg · 10-13-2009, 07:15 PM

Sounds like you need to do the research yourself, before you undertake this project. Will save you the unadvertised additional cost of a dual setup.

85*4runner · 10-13-2009, 07:42 PM

The way i look at it it isn't very much more to get the crawl box already built. The adapter is 370 from marlin lets say i get a stock T-case for 150 bucks. That's $520 just for the parts then i still have to put it together. I know i have the capability to do it myself but for $80 bucks ill have it done by marlin. I have searched for a while, and was almost positive i needed 21 spline output i just wanted to double check. I already have made a square drive line for my RUF should i put trail creeper U joints in it? I only see upgraded one's on trail gear, are those the best ones to get if needed?

muddpigg · 10-14-2009, 11:59 PM

Shoot you know it all, seems like experience is the best teacher. Have fun.

oldgold3vze · 10-15-2009, 08:39 AM

I've been wheeling hard on the standard marlin MC07 21 spline all season with no breakage. I started on tires that were way too big (40s) but now I am running a more sensible 34x10.50 with 5.29 gears. It's important to re gear your axles to relieve stress on the t-case output shaft. Just cause you have duals doesn't mean that you can keep 4.10s.

firsttruck1985 · 10-15-2009, 04:30 PM

so how low do it has to go in the diff

89silverpu · 10-15-2009, 04:37 PM

Quote:

Originally Posted by firsttruck1985

so how low do it has to go in the diff

I think you need to do some more research on dual cases. If you don't know anything about gearing in the axles or what is involved in a dual case set up, you most likely would be fine without either.

What is your intended use for your truck? Search dual cases on this forum, or toyota dual cases on google and you'll learn alot real quick. As for which setup you need, you should probably call them if you have no idea. They were very helpful when I ordered my dual case stuff.

10-13-2009, 06:22 PM	#2 (permalink)
4Crawler Contributing Member Join Date: Jun 2002 Location: SF Bay Area, CA Posts: 7,836	Your current case is 21 spline input, matches the transmission 21 spline output. The new reduction box would likely fit in between those two (obvious answer to your question), unless you want to change it and your current box to a 23 spline output/input. __________________ 1985 Toyota 4Runner SR-5, 22REC engine, dual t-cases, 4.88 gears, dual ARBs, 33x10.50 BFGs or 35x12.50 MTRs r.c.brown@ieee.org TruckEditor@tlca.org Project: 4Crawler 4Crawler OffRoad Gettin'Off 4WD Club

10-13-2009, 07:08 PM	#4 (permalink)
myyota Registered User Join Date: Oct 2006 Location: San Pablo, CA Posts: 1,430	Unless you plan on beating the hell out of your truck, the 21 spline will be just fine. __________________ 86 Toyota 4Runner Solid Axle Swap, 16'' of lift, 37x12.50-15 GoodYear MTR tires, 5 speed manual trans swap, InchWorm Duel Cases With 5.7 Gears, 63'' Chevy Springs In The Rear, 5'' Trail Gear Springs In Front, Marlin Crawler Third Members, 4.88 Gears With A Detroit In The Rear, High Pinion Front With 4.88 Gears And An ARB, Downey Header, Optima Battery, Trail Gear Sliders, Addicted Offroad Front Bumper, Trail Gear Rear Bumper.

10-13-2009, 07:15 PM	#5 (permalink)
muddpigg Registered User Join Date: Mar 2007 Location: injured and stateside :( Posts: 1,395	Sounds like you need to do the research yourself, before you undertake this project. Will save you the unadvertised additional cost of a dual setup. __________________ http://www.youtube.com/watch?v=rqtr_RvR3sY Balljoints for sale. Open to trades and offers. http://www.yotatech.com/f11/ball-joi.../#post51278784

10-13-2009, 07:42 PM	#6 (permalink)
85*4runner Registered User Join Date: Feb 2009 Posts: 15	The way i look at it it isn't very much more to get the crawl box already built. The adapter is 370 from marlin lets say i get a stock T-case for 150 bucks. That's $520 just for the parts then i still have to put it together. I know i have the capability to do it myself but for $80 bucks ill have it done by marlin. I have searched for a while, and was almost positive i needed 21 spline output i just wanted to double check. I already have made a square drive line for my RUF should i put trail creeper U joints in it? I only see upgraded one's on trail gear, are those the best ones to get if needed? Last edited by 854runner; 10-13-2009 at 07:44 PM.*

10-14-2009, 11:59 PM	#7 (permalink)
muddpigg Registered User Join Date: Mar 2007 Location: injured and stateside :( Posts: 1,395	Shoot you know it all, seems like experience is the best teacher. Have fun. __________________ http://www.youtube.com/watch?v=rqtr_RvR3sY Balljoints for sale. Open to trades and offers. http://www.yotatech.com/f11/ball-joi.../#post51278784

10-13-2009, 06:57 PM	#3 (permalink)
85*4runner Registered User Join Date: Feb 2009 Posts: 15	I know the 23 spline is stronger but how much stroger? Am i likely to break a 21 spline? What is involved in changing it to a 23? What do i have to buy?

10-15-2009, 08:39 AM	#8 (permalink)
oldgold3vze Registered User Join Date: Jan 2008 Location: Ft. Collins, CO Posts: 313	I've been wheeling hard on the standard marlin MC07 21 spline all season with no breakage. I started on tires that were way too big (40s) but now I am running a more sensible 34x10.50 with 5.29 gears. It's important to re gear your axles to relieve stress on the t-case output shaft. Just cause you have duals doesn't mean that you can keep 4.10s. __________________ -1984 reg. cab truggy. I HATE SHEET METAL ON TRAIL RIGS!!!! duals, locked f/r 5.29s, hysteer, 63s and RUF springs, 34 x 10.50 Swampers, 1" master, V-6 calipers, dove nosed & street legal (thanks Colorado) -1988 4Runner, daily driver, Downey intake, Headers, rear AAL, Stock, and staying that way! (maybe)

10-15-2009, 04:30 PM	#9 (permalink)
firsttruck1985 Registered User Join Date: Jun 2009 Posts: 78	so how low do it has to go in the diff

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