offset rear diff - Pirate4x4.Com : 4x4 and Off-Road Forum
 
Pirate4x4.Com : 4x4 and Off-Road Forum  

Go Back   Pirate4x4.Com : 4x4 and Off-Road Forum > Brand Specific Tech > Jeep - Hardcore Tech
Notices

Reply
 
Share Thread Tools Display Modes
Old 03-11-2006, 12:02 AM   #1 (permalink)
Registered User
 
Join Date: Oct 2005
Member # 55612
Posts: 54
offset rear diff

o.k. were all j10 and j20 rear diff. offset a few inches to the passenger side to accomodate both the qtrac and non-qtrac set ups? if so, were all years that way? what the hell else would a person be thinking about at 3:00AM on a Friday night?

Lewman
__________________
JEEP: '79cj7 304 bored .30 over, t400qtrac/part time transfer, '74 cj axles. Planned: Stock appearence w/ 4" springs/38x12.50's d60/14bFFc&c/np205. SCOUT: chopped-up '77 traveler carcass bought new; 4spd. and 4" springs. Planned: 33" dually or 38' srw d60/14bFFc&c/np205.
LewMan is offline   Reply With Quote
Old 03-11-2006, 12:23 AM   #2 (permalink)
Registered User
 
Join Date: Sep 2004
Member # 36015
Posts: 132
The D20 J's weren't offset. The qtrac J trucks were, but its really not a drastic offset and if you weren't distinctly looking for it you might almost not notice. In the greater scheme of things you can get away with either or for either application. The compound angles are not going to be excessive IMO.
ChicksDigWagons is offline   Reply With Quote
Sponsored Links
Old 03-11-2006, 12:24 AM   #3 (permalink)
Registered User
 
Join Date: Sep 2004
Member # 36015
Posts: 132
Oh, I think this is where I'm supposed to say "This isn't Hardcore Tech" biatch.

But I'm not real good at being an asshole.
ChicksDigWagons is offline   Reply With Quote
Old 03-11-2006, 12:44 AM   #4 (permalink)
Registered User
 
Join Date: Oct 2005
Member # 55612
Posts: 54
flame

Thanks for trying! I've been flamed by the best, I'm not skeered!

I'm buying a '78 j20 qtrac and will swap out the t400 tailshaft to accept a part time transfercase, possibly a 205 or just a stock jeep transfer.

I want the ffd60 but was worried if the offset would mess me up, after the 4-8" suspension lift.

should i run cv joints to absorb the compound angle?

is that hardcore enough 4u or do i have to talk 4link???

lewman
__________________
JEEP: '79cj7 304 bored .30 over, t400qtrac/part time transfer, '74 cj axles. Planned: Stock appearence w/ 4" springs/38x12.50's d60/14bFFc&c/np205. SCOUT: chopped-up '77 traveler carcass bought new; 4spd. and 4" springs. Planned: 33" dually or 38' srw d60/14bFFc&c/np205.
LewMan is offline   Reply With Quote
Old 03-11-2006, 08:27 AM   #5 (permalink)
Registered User
 
Join Date: Sep 2004
Member # 36015
Posts: 132
Quote:
Originally Posted by LewMan
Thanks for trying! I've been flamed by the best, I'm not skeered!

I'm buying a '78 j20 qtrac and will swap out the t400 tailshaft to accept a part time transfercase, possibly a 205 or just a stock jeep transfer.

I want the ffd60 but was worried if the offset would mess me up, after the 4-8" suspension lift.

should i run cv joints to absorb the compound angle?

is that hardcore enough 4u or do i have to talk 4link???

lewman
Actually, it would be better to run a non CV driveshaft because there is no way you can get the pumpking pointing directly at the output of the T-case so there is always going to be some vibration from the rear U-joint with a CV style joint at the T-case end. With two U-joints you can keep them balanced even with compound angles.

It sounds like you're planning on keeping the D60 in the J-truck, with that kind of wheelbase its pretty much a non-issue anyway. I'd be different if you wanted it in a CJ5 or something with an ultra-short wheelbase.
ChicksDigWagons is offline   Reply With Quote
Old 03-11-2006, 11:54 AM   #6 (permalink)
Registered User
 
jpnjim's Avatar
 
Join Date: Aug 2003
Member # 22209
Location: New Hampsterchussetts
Posts: 814
I disagree with J-trucks using D20 T-cases not having their pumpkins offset.

My 73' J4000 rear (SF D60) is the D20 version, and is slightly offset.
I've seen the QT version of this same SF D60, and it's much more offset.


My understanding is the offset was done for gas tank clearance on non-QT vehicles.



edit,
I searched around a little for this, and there's alot of conflicting info out there.

So I'll just stick to the fact that my D20 equipt J4000 rear is slightly offset, and have seen the same SF D60 from a QT, and it was greatly offset.
__________________
88' hEEP trail rig
89' hEEP daily driver

Last edited by jpnjim; 03-11-2006 at 12:11 PM.
jpnjim is offline   Reply With Quote
Old 03-11-2006, 12:23 PM   #7 (permalink)
Registered User
 
Brink_'s Avatar
 
Join Date: Dec 2005
Member # 63901
Location: Alberta, Canada
Posts: 1,697
I had always thought they were offset to clear the gas tank. Regardless of t-case. But I am no expert on J trucks. Just know what I have seen on 3 or 4 of them in person. 2 were definately D20's and were not centered.
Brink_ is offline   Reply With Quote
Old 03-11-2006, 12:29 PM   #8 (permalink)
Wheeler
 
Skorch's Avatar
 
Join Date: Dec 2005
Member # 63684
Location: Northern Ca.
Posts: 499
offset rear axle

I have a 1969 commando with a 1970 jeep wagoneer rear axle 3.5 inches offset to passenger side.It has a cv upper with a 33 inch long driveline and has no vibration at any speed up to75 mph. Hope this helps
Skorch is offline   Reply With Quote
Old 03-11-2006, 02:24 PM   #9 (permalink)
Registered User
 
Join Date: Oct 2005
Member # 55612
Posts: 54
good info.

[QUOTE I'd be different if you wanted it in a CJ5 or something with an ultra-short wheelbase.[/QUOTE]

yes, I did this with a '77 cj7. born v8,t400, qtrac. I swapped in '74 axels front and rear (rear was center diff.), '74 transfer case (don't know what it actually was), adapter plate (advance adapters? t400 to jeep transfercase) and the appropriate t400 tail shaft. worked great after building the motor .30 over. pretty good project for a 16 y/o!

no problem with vibration. still have the cj, sort of, and was thinking of using some of those parts for the j20 project. that's what started all the hubub.

o.k-question: do some FSJ's with part-time use a stock adapter plate with t400 to part-time transfercase? can this adapter be found in junkyards? AA gets a high dollar for this.

thanks for all the info.

lewman
__________________
JEEP: '79cj7 304 bored .30 over, t400qtrac/part time transfer, '74 cj axles. Planned: Stock appearence w/ 4" springs/38x12.50's d60/14bFFc&c/np205. SCOUT: chopped-up '77 traveler carcass bought new; 4spd. and 4" springs. Planned: 33" dually or 38' srw d60/14bFFc&c/np205.
LewMan is offline   Reply With Quote
Old 03-11-2006, 10:37 PM   #10 (permalink)
Registered User
 
Join Date: Sep 2004
Member # 36015
Posts: 132
There is a stock TH400 -> D20 adapter, but is supposedly pretty weak. I've chosen to stick with the Q-trac behind my TH400...its not the best, but it gets the job done!
ChicksDigWagons is offline   Reply With Quote
Old 03-11-2006, 10:51 PM   #11 (permalink)
Registered User
 
Join Date: Jan 2006
Member # 65100
Location: Dodge, NE
Posts: 5,194
Send a message via Yahoo to rustywagoneersdotcom
run the QT til you pop it, then worry about swapping!!

the QT's were used in some serious race and rally iron...
admittedly, they were brand new, and factory supported race teams.

peace!
Dave
__________________
800 dollar running driving 240D. Tried to link in sig, but I am a blackstar leach.
rustywagoneersdotcom is offline   Reply With Quote
Old 03-14-2006, 07:06 AM   #12 (permalink)
Registered User
 
Grantshire's Avatar
 
Join Date: Mar 2006
Member # 68858
Location: Richmond, VA
Posts: 26
QT axles are offest to the greatest degree because the QT rear output shaft is in line with the front output shaft and not the transmission (like the old 18 TC). Manual tranny and earlier autos had slight offset for coffin style gas tank under the driver's side. When the FSJ's swithced to the AMC 20 rears they became a centered differential. Jeep switched back to a Dana 44, but centered this time, during the last years of the big Jeeps (86-91 for the Grand Wagoneers). If you can find the last of the J trucks they also had a centered Dana 44 (at least the J10 did).
__________________
Richard
62 Willys SW, 67 M715, 69 Commando, 74 Wagoneer, 79 Chief, 81 Scrambler, 86 CJ10A
Grantshire is offline   Reply With Quote
Old 03-14-2006, 08:32 AM   #13 (permalink)
Registered User
 
Brian1's Avatar
 
Join Date: Nov 2000
Member # 2205
Location: Albuquerque, NM
Posts: 3,023
I have a rear 44 from a late 70's J10 and the yoke is offset to the pass side by 6". The truck had a Dana20. This axle is for sale if anyone is interested (PM me)
__________________
Brian

NMOffroad.com
Brian1 is online now   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

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 11:39 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.0 ©2011, Crawlability, Inc.