Topic: Marlin Crawler

[Dale Martini]

I have a 85 Toyota truck with a W56 Marlin built transmission and stock transfer case. In the sometime distant future I plan on changing out the 22RE to a 22RET. That being said is there a way for me to put in a 23 spline crawler and make it work safely with what I already have?
Thanks in advance!
Dale Martini

[T-Revv]

Short answer, no.  The coupler that is on the output shaft of the transmission is 21 spline.  There is no way to change that output shaft in the transmission to make it 23 spline.  However going to a 22ret shouldn't break your 21 spline input.   It is not that dramatic of an increase in power.  Id run it just like it is.

[gnob]

Trans spline coupler adapter.

https://redirect.viglink.com/?format=go&jsonp=vglnk_153565487696414&key=36ad8bc22d612b2ca8645f59506d611a&libId=jlgx9ac901001ld0000MAmb0qha2x&loc=https%3A%2F%2Fwww.pirate4x4.com%2Fforum%2Ftoyota-truck-4runner%2F2663924-w56-output-shaft-spline-count.html&v=1&out=http%3A%2F%2Fwww.davezoffroadperformance.com%2Fstore%2Fdrivetrain%2Fmanual-transmission%2Fparts%2Ftoyota-21-23-spline-coupler.html&ref=https%3A%2F%2Fwww.pirate4x4.com%2Fforum%2Ftoyota-truck-4runner%2Findex2.html&title=W56%20output%20shaft%20spline%20count%20-%20Pirate4x4.Com%20%3A%204x4%20and%20Off-Road%20Forum&txt=Toyota%2021-23%20Spline%20Transmission%20Coupler

[T-Revv]

Trans spline coupler adapter.

https://redirect.viglink.com/?format=go&jsonp=vglnk_153565487696414&key=36ad8bc22d612b2ca8645f59506d611a&libId=jlgx9ac901001ld0000MAmb0qha2x&loc=https%3A%2F%2Fwww.pirate4x4.com%2Fforum%2Ftoyota-truck-4runner%2F2663924-w56-output-shaft-spline-count.html&v=1&out=http%3A%2F%2Fwww.davezoffroadperformance.com%2Fstore%2Fdrivetrain%2Fmanual-transmission%2Fparts%2Ftoyota-21-23-spline-coupler.html&ref=https%3A%2F%2Fwww.pirate4x4.com%2Fforum%2Ftoyota-truck-4runner%2Findex2.html&title=W56%20output%20shaft%20spline%20count%20-%20Pirate4x4.Com%20%3A%204x4%20and%20Off-Road%20Forum&txt=Toyota%2021-23%20Spline%20Transmission%20Coupler

I don’t see the purpose of that coupler. Yes then you can put a 23 spline tcase input in, but the trans output is still 21 spline. So you haven’t strengthened anything, just moved the weak link from the tcase input to the trans output. And I’d rather break a tcase input any day over a trans output.

[blackdiamond]

I don’t see the purpose of that coupler. Yes then you can put a 23 spline tcase input in, but the trans output is still 21 spline. So you haven’t strengthened anything, just moved the weak link from the tcase input to the trans output. And I’d rather break a tcase input any day over a trans output.

I think more importantly, the t-case input sees at least 2.28x less torque than the t-case output when in low range.  You need the 23-spline more at the t-case output thought my wimpy 21-spline stuff has been doing just fine with my high output (my 4Runner is lifted) big horsepower (singular) engine.

[T-Revv]

I think more importantly, the t-case input sees at least 2.28x less torque than the t-case output when in low range.  You need the 23-spline more at the t-case output thought my wimpy 21-spline stuff has been doing just fine with my high output (my 4Runner is lifted) big horsepower (singular) engine.

Correct.  It is suggested to have a 23 spline input for the second case if you are running a dual case, because 2.28 times the torque is hitting that input when the front case is in low.  Factory outputs are 27 spline, but Marlin sells 30 spline upgraded outputs which will see the most torque.  For your front case the input being 21 spline is not a problem.  It is extremely rare to hear of someone breaking a the input in a front case, and the input on the front case breaking is saving your transmission from breaking.  If you are worried about breaking a front input, you need to upgrade your transmission.

[Pat]

  Not the ultimate set up but a neat option to have for the guy who happens to have that 23 spline set up sitting there.

[Dale Martini [OP]]

Thanks everyone for responding to my post! a lot of great info. I will take Hanks advice and stick with the 21 spline. (Thanks Hank) My 1985 Hilux Truck is almost finished. All that is needed is the Crawler.