International Full Size Jeep Association
Home Forums Reader's Rigs Tech Library Trail Stories FSJ-List
International Full Size Jeep Association  

Go Back   International Full Size Jeep Association > Tire Kickin' > Off-Road FSJ Tech

Reply
 
Thread Tools Search this Thread Display Modes
  #81  
Old 07-19-2007, 04:07 PM
Slick Willie's Avatar
Slick Willie Slick Willie is offline
Master Mechanic
 
Join Date: Apr 06, 2005
Location: Brownsboro, TEXAS
Posts: 1,387
I wheeled with a 26:1 ratio with 42's a few times. It worked fine for rock crawling. It just took a little more gas than most.

I agree with installing it now with 32 spline outputs and upgrading to a 4:1 later down the line. You can wheel with a 26:1 with 37's just fine. Stock D300's have 26 spline outputs. You can see some differences here: http://www.jeepsunlimited.com/mambo2/index.php?option=com_content&task=view&id=85&Itemi d=32

If you run larger Ujoints than stock 1310, you might break the output before a Ujoint, but that's not guaranteed.

The way I see it, if you spent over a grand on building up a tranny, I would imagine beefing up the rest of the drivetrain would be important. Don't cut corners now.
__________________
-Will
'86 Wagoneer 360/727/Stak 3 speed/HP60/FF14/welded 4.10's/~3" Front Springs/Chevy 63's/42's/hummer beadlocks/topless/8 point cage/half doors

Quote:
Originally Posted by rockjeep44
After this weekend chicks are gonna need suspenders to keep their panties up when I roll in

Last edited by Slick Willie : 07-19-2007 at 04:10 PM.
Reply With Quote
  #82  
Old 07-20-2007, 06:39 AM
scotty's Avatar
scotty scotty is offline
 
Join Date: Jun 12, 2000
Location: dayton,oh,45431
Posts: 6,627
Quote:
Originally Posted by jeeping1974
i would like a better crawl ratio seeing that first gear in my tranny is 2.48:1 and i'm going with 4.10 R+P. that only gives me a finial crawl ratio of 26.23. there is any way to get a lower first gear

you are not factoring in the torque convertor. no way automatics would be as popular or as driveable if the tranny "felt" like a manual tranny with a 2.48 ratio. the most common way of figuring crawl ratios with the auto is to double the first gear,so your 2.48 feels like a manual tranny with a ratio of 4.96. 5:1 is a lower first gear than most non-granny transmissions use(t150 uses a 3:1,t176 and many others use a 4:1 first),and is the same as some 5 speeds.

so your crawl ratio with a stock d300 and 4.10s is actually more like: 4.96x2.61x4.10=53.07 not nearly as bad as you thot

crawl ratio is important,but dont become so involved with it that you forget how to wheel in the real world. i used to drive my GW back and forth to the trails with 38" tires,a 904 auto and 3.31 axle gears i did this with several different NP cases and the d300,and they all drove fine on the road and did fine on my trails in low range.


Quote:
Originally Posted by jeeping1974
i'll probably look into swapping in a manual.
now youre talkin but if youre doing it only to get a lower final drive,thats not such a great reason.

if you want to do it because the granny 4 speed gives you more gear combinations,or because you feel a grindbox is more reliable than a slushbox,or because you feel like you have more control with the manual,then go for it.

but dont do it just because you think the 2.48 first gear is hurting your off road performance.
__________________
scotty
85 grand wagoneer
258/t18/d20/10 bolt/14 bolt
38" TSL SXs
chopped,bobbed and caged

http://nightcrawlers4wd.20megsfree.com/index.html\

http://mytrailrigs4x4.20megsfree.com/photo.html\

Last edited by scotty : 07-20-2007 at 06:47 AM.
Reply With Quote
  #83  
Old 07-20-2007, 10:09 PM
jeeping1974's Avatar
jeeping1974 jeeping1974 is offline
FSJ Maniac
 
Join Date: Jun 17, 2007
Location: Manchester, NH
Posts: 3,066
i love manual trannies. i love having more control over the vehicle. my DD is a manual and i love it. i'll probably look into a SM465 tranny though just for the reason of great crawl ratios and control.
__________________
03 GMC 2500HD - DD/toy hauler
06 Street Glide - Cruiser
Reply With Quote
  #84  
Old 07-21-2007, 10:01 AM
jeeping1974's Avatar
jeeping1974 jeeping1974 is offline
FSJ Maniac
 
Join Date: Jun 17, 2007
Location: Manchester, NH
Posts: 3,066
so i got the TH400 to np208 adaptor housing in yesterday and i wanted to make sure that it would fit. it does fit but there is a problem. 5 out of the 6 bolt holes line up. is this normal? should i run it like that and be ok or should i drill a new hole so that it lines up properly? here is what it looks like.



i am planning on using lock tight on the bolts (the blue one). also how does the output of the tranny get sealed? do i just put a thin layer of RTV on the housing between that and the dana 300?
__________________
03 GMC 2500HD - DD/toy hauler
06 Street Glide - Cruiser
Reply With Quote
  #85  
Old 07-21-2007, 01:10 PM
malodin's Avatar
malodin malodin is offline
Bleedin' Gasoline
 
Join Date: Sep 03, 2004
Location: sumner washinton
Posts: 1,528
yes 5/6 bolts is normal, the 6th bolt is what clocked the 208 you could once you have the tranny and stuff up in there and figure where you want your t-case to hang drill out the other bolt hole, i didnt it.

there is a round pattern dry gasket you can get at the auto stores for cheap, might have to work with them a little bit and get it figured out. or just use rtv.
__________________
1977 CHEROKEE CHIEF, 401, SOA FRONT SITTING ON HD44 4.10'S, TH400/D300 COMBO, 14BFF REAR WITH TT'S FAB'S REAR SHAKLE FLIP KIT, RB'S BRONCO TANK MOD. 35'S
Reply With Quote
  #86  
Old 07-22-2007, 09:52 PM
Big-wagon87's Avatar
Big-wagon87 Big-wagon87 is offline
Member
 
Join Date: Oct 29, 2006
Location: Hazard KY
Posts: 208
MY 2 Cents: 205 to a 400th hard to beat my upgrades once you have your case. GM 205 for a 400 has lomax kits to get your ratios low to 300;1 or something like that or make a klune or 203 under drive or even a low max with a underdrive that would be ultra ultra low. The 205 is cheap gear driven and can handle as much power any amc moter can give it.

oh yeah check every junk yard you can get used ones for 250 if you aint in dire need and look around. often you can buy old junk ton chevys that will have axles and cases for 500 that what these park jockeys do.

CH
__________________
87 wag on 44's 360 mod on propane, np435, 203/205 doubler w/lowmax
76 cherokee cheif 401
bunches of baby jeeps
Reply With Quote
  #87  
Old 07-23-2007, 03:21 AM
jeeping1974's Avatar
jeeping1974 jeeping1974 is offline
FSJ Maniac
 
Join Date: Jun 17, 2007
Location: Manchester, NH
Posts: 3,066
i'm not sure about that kind of pricing up here. you can find sm465/np205 combos up here for $100-$150 and a np205 and dana 300 t-cases for $100-$150 bucks.
__________________
03 GMC 2500HD - DD/toy hauler
06 Street Glide - Cruiser
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 08:16 PM.


Powered by vBulletin Version 3.5.4
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
corner corner