Topic: another dual t/case question

[jafish]

I'm lookin' to do a dual case setup, but I need to do it slowly (would love to just call and get the Dual Ultimate Crawler, $1550 for 23 spline, but that's pretty much out of the question). Should I start by buying the MC dual case adapter with 10* rotation ($499) and then find another case and do it myself or buy the MC crawl box ($659 for 21 spline or $889 for 23 spline)? I could possibly afford the adapter soon, but the crawl box will take me a little while since I'll probably go with the 23 spline if I go that route. I read some other stuff on the board, and I'm a little confused if I can even use the 23 spline doing it the slow way. Any info would be great.

Thanks.

[skid]

I'm guessing your existing setup has the 21 spline gear case?

If you want two cases with stock gear ratios, buy the 23 spline r10 adapter and a 23 spline input gear for the rear case. $660 plus shipping.  If your going that far, I'd recommend 4.7 gears in the back case(which are on sale now). $900 for gears and adapter.  I'd save and do it all at once.  I have a mc08 r10 adapter and love it.  I'm sold on the rotated adapters.

[jafish [OP]]

I'd love to do it all at once, but I'm not sure how long it'd take me to save up the money. Maybe, it's just better if I keep saving so I don't have to do the job 2 or 3 times.

[jafish [OP]]

I'm guessing your existing setup has the 21 spline gear case?

I'm not sure, is there a way to know?

[79coyotefrg]

I'm not sure, is there a way to know?

what truck do you have and has it been reworked by  a previous owner ie  is it stock?

[jafish [OP]]

It's a 85 4cyl, and I still need to find out if the t/case has been messed with. The rest of the truck was, so I won't be surprised, but I need to find out for sure. If it's stock, then it's 21 spline?

[skid]

http://www.marlincrawler.com/htm/transmission/transmission.htm

Look at that link and figure out which transmission you have.   The only way to get a 23 spline front case would be behind the r151 tranny that came behind turbo trucks.   Most likely you have a g52 or g54 if it's carbed, w56 if it's efi.  The g and w series are 21 spline into the t-case.

one alternative you could do is buy a 21 spline adapter and find a case.  Run this and save for the 23 spline gear or gearset and 23 spline coupler.  Cost more in the end, but would be over time.