dual case question

kinzer · 09-12-2009, 12:33 AM

i tried searching and couldn't find anything useful so ill just ask

im building dual cases, i have a set of 4.70 gears 23 spline, and a 23 spline adapter with 23 spline input gear in the rear case, i am also running a v6 transmission so i need to match the 23 spline output shaft,

my question is, is there any harm with putting the 4.7 gears in the first case and leave the 2.28 gears in the rear case. iv heard about it causing failure to the rear reduction box due to input shaft failure of a 21 spline. but since i have the 23 spline set up, will it be ok?

This ad is not displayed to registered members.
Register your free account today and become a member on Yotatech!

BAMF_CT2004 · 09-12-2009, 05:28 AM

thats a good question. have you tried marlins forum or pirate? i cant help with that one because I dont have a dual case YET and have looked that much into them.

**waskillywabbit** · 09-12-2009, 07:03 AM

IMO if you build duals you should get a chromoly output shaft from Longfield anyway so you will be tearing both cases apart regardless.

It's early and I haven't had any coffee, but you want the 4.7 gears in the rear case.

neoworm0 · 09-12-2009, 09:32 AM

IT has nothing to do with the number of splines on the input. It's more about how the torque is multiplied through cases. When you put the 4.7's in the front case you end up stressing the coupler a lot more than you would with the 4.7's in the rear case.

If you are using two gear drive cases I would reccomend putting the 4.7's in the rear case. Is there some reason you don't want to do that?

There is a very good thread on this subject on Marlin's site or maybe Pirate.

kinzer · 09-12-2009, 10:07 AM

actually it does, i know it causes more stress on the rear case, especially with the stock 21 spline, thats why i stated i have the 23 spline because its stronger.

the reason i am asking this is i already rebuilt the rear case and its all sealed up, and id rather not have to tear back into it but i might as well to be safe. that and i was curious because i knew it was a rule of thumb to put the 4.7 gears in the rear case but with stronger gears would it really matter.

neoworm0 · 09-12-2009, 10:13 AM

It's not just the input shaft you need to worry about, I'd be concerned aout stripping the the coupler more (Speaking from experience). But you seem to already know all the answers so do whatever you want then.

09-12-2009, 07:03 AM	#3 (permalink)
waskillywabbit Super Moderator-Sponsoring Member Staff Join Date: Jul 2003 Location: Tuscaloosa, AL Posts: 14,559	IMO if you build duals you should get a chromoly output shaft from Longfield anyway so you will be tearing both cases apart regardless. It's early and I haven't had any coffee, but you want the 4.7 gears in the rear case. __________________ WabFab Off-Road, LLC MySpace Twitter Facebook 7th Annual South East 4Runner Jamboree, 2010 The toughest part of a Jeep is the chick driving it. WabFab Off-Road 4th Anniversary Sale Last edited by waskillywabbit; 09-12-2009 at 07:05 AM.

09-12-2009, 09:32 AM	#4 (permalink)
neoworm0 Registered User Join Date: Jan 2005 Location: North Vancouver, BC Posts: 604	IT has nothing to do with the number of splines on the input. It's more about how the torque is multiplied through cases. When you put the 4.7's in the front case you end up stressing the coupler a lot more than you would with the 4.7's in the rear case. If you are using two gear drive cases I would reccomend putting the 4.7's in the rear case. Is there some reason you don't want to do that? There is a very good thread on this subject on Marlin's site or maybe Pirate. __________________ 1995 Toyota PU SR5. 2000 3.4l V6 and a few other mods. my album: http://www.yotatech.com/album.php?albumid=101 my SAS: http://picasaweb.google.com/areinhol...eat=directlink www.overlandcanada.ca www.alltracwagon.net

09-12-2009, 10:13 AM	#6 (permalink)
neoworm0 Registered User Join Date: Jan 2005 Location: North Vancouver, BC Posts: 604	It's not just the input shaft you need to worry about, I'd be concerned aout stripping the the coupler more (Speaking from experience). But you seem to already know all the answers so do whatever you want then. __________________ 1995 Toyota PU SR5. 2000 3.4l V6 and a few other mods. my album: http://www.yotatech.com/album.php?albumid=101 my SAS: http://picasaweb.google.com/areinhol...eat=directlink www.overlandcanada.ca www.alltracwagon.net Last edited by neoworm0; 09-12-2009 at 10:14 AM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search