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 > Tech Archives > Drivetrain

Reply
 
Thread Tools Display Modes
  #1  
Old 11-27-2001, 02:22 PM
Dean Dean is offline
Grease Monkey
 
Join Date: Apr 09, 2000
Location: Medford,Oregon
Posts: 270
Lightbulb

Bahamut and I were exploring a low range unit one day when an idea came to me.

What if someone made the input sprocket smaller? If you made one the same size as the output sprocket from an OD kit then you could have an internal full time reduction. Just use the OD chain. This would be like changing both diffs, or would compensate for larger tires. After looking at the sprocket it looks like someone with gear hobbing experience could cut one.

Now the question, How do you tell if your chain is a good one or a cheap one? I bought a used case with a 1to1 PT kit in it and the chain looks tight. Also the shift can looks new but I can blow through it, it appears to be a piston and not a diaphram. Trash?

Thanks, Dean.
edit, I am referring to the two big sprockets that the chain rides on.

[ November 27, 2001: Message edited by: Dean ]

[ December 03, 2001: Message edited by: Sitting Bull ]
__________________
'78 Wagoneer Limited, 401/Q-trac W/low range. Mods so far, carter 4 bbl., rancho 3" lift, rancho RS5000 & RS9000,GB ign upgrade. '85 GW now with reverse, but great body. Donor rigs, '84 GW, '78 J20.
Reply With Quote
  #2  
Old 11-28-2001, 01:42 AM
joe joe is offline
 
Join Date: Apr 28, 2000
Location: PNWet, USA
Posts: 22,371
Post

<BLOCKQUOTE>quote:</font><HR>Originally posted by Dean:
Now the question, How do you tell if your chain is a good one or a cheap one? I bought a used case with a 1to1 PT kit in it and the chain looks tight.<HR></BLOCKQUOTE>

Dean, I can't help with deciding the quality of your chain but factory specs for max allowable deflection of the chain is 1/2".
__________________
joe
"Don't mind me. I'm just here for the alibi"
Reply With Quote
  #3  
Old 11-28-2001, 05:45 AM
Bob Barry Bob Barry is offline
Jeep Doctor
 
Join Date: Apr 09, 2000
Location: Providence, RI
Posts: 8,189
Post

In principle, I don't see why it can't be done. I imagine that the reason it HASN'T been done is economic; not enough demand to justify the expense of tooling up for a new gear.

Another upgrade might be from the original 10-spline TH400 output shaft to a fine-spline and matching sun-gear for the reduction unit. Maybe even of larger diameter. I've seen a junkyard tranny where those splines were bent and almost gone.
Reply With Quote
  #4  
Old 11-28-2001, 05:37 PM
flyboy flyboy is offline
Grease Monkey
 
Join Date: Oct 15, 2001
Location: Collinwood, TN 38450
Posts: 446
Post

went thru two reduction units before i realized the splines on the output shaft were trashed. I was towing an equipment trailer with a bobcat. Lots of weight.I run a TH400/D20 now. Never had trouble with the qt in my cj, had a 304 and 38's.
__________________
73 J-4000,360,TH400/D20,springover,Q78 buckshots
Reply With Quote
  #5  
Old 11-30-2001, 04:49 AM
jeepbob jeepbob is offline
Jeep Idiot
 
Join Date: Jan 16, 2001
Location: Caro, Mi, USA
Posts: 2,513
Post

The biggest problem will be (besides the cost)the fact that the splines in the cone clutches are not strong enough to handle the reductin that the low range has now. To put anymore strain on them would be asking for trouble.
__________________
65 wag. with a bunch of stuff done and more happening.<br /><br />\"If the local junkyard calls you for Jeep parts, you might be a redneck\".... and yes they do!
Reply With Quote
Reply


Thread Tools
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 12:58 AM.


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