1978 CJ7 Transmission and Transfer Case - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > 1978 CJ7 Transmission and Transfer Case

*VOTE NOW Help Metalcloak Giveaway an XJ Suspension*Stainless Steel Door Hinge PinsPoly Door Hinge Bushings

Reply
Unread 03-22-2013, 09:37 AM   #1
bigdee2
Registered User
 
Join Date: Jun 2011
Location: Baton Rouge, Louisiana
Posts: 76
1978 CJ7 Transmission and Transfer Case

1978 CJ7 304 V-8 3 speed manual


My understanding is that there can be a number of different trannies, differential and front/rear axels on this particular model.

What are the most common:

Transmission
Differential
From Axel
Rear Axel


Are these normally positive/limited slip or open front and rear end differential?


Who normally works on fixing or rebuilding a transfer case - a transmission guys or an axel/differential guy?

bigdee2 is offline   Reply With Quote
Unread 03-22-2013, 09:44 AM   #2
rah2eq
Registered User
1978 CJ5 
 
Join Date: Nov 2011
Location: Richmond, VA
Posts: 108
Transmission is a tremec T-150, transfer case in 78 was the dana/spicer 20. The stock rear axle was the AMC model 20, it's differential housing it spherical in shape. And I'm not sure about the front axle in 78, I think mine's a Dana 35 but don't quote me on that.
__________________
1978 CJ5 - 304 V8 - Twin Sticked and sitting on 35's
2010 JK- Rock Krawler 2.5" on 35" KM2's
rah2eq is offline   Reply With Quote
Unread 03-22-2013, 10:22 AM   #3
jp360cj
Registered User
1977 CJ7 
 
Join Date: Oct 2007
Location: Greenville, North Carolina
Posts: 1,719
Its a Dana 30 front axle. From my knowledge, the Dana 35 is a rear axle and used in YJs and TJs. And maybe JKs, not sure about those.
__________________
77 CJ-7- AMC 360, Edelbrock cam, MC2100, Fenderwells, CJ T18/D20, Chevy D44/EB 9" rear, Trutrac f/r, 4.11, SOA, 1.25 lift shackles, 35x12.50 BFG KM2s, Shackle Reversal
jp360cj is offline   Reply With Quote
Unread 03-22-2013, 03:15 PM   #4
hutch1200
Web Wheeler
 
hutch1200's Avatar
1979 CJ7 
 
Join Date: Feb 2007
Location: , Pa
Posts: 2,677
T-150 trans/dana 20 xfer case/AMC 20 rear/and a 30 up front.
INHO....DO NOT sell the AMC 20 short. Unless you can get 300hp from the 304, you can make it live nicely. Get 1 pc axles, weld the tubes to the pumpkin and maybe add a truss if you're a rock crawler or like gettin' air. I just lucked into a D44, but wouldn't have shelled out big bucks for 1.
Good Luck
.
EDIT: "Are these normally positive/limited slip or open front and rear end differential?"
Odds are it's either 3.54 or 3.73 (rare). About a 2% chance of the cheesey "Trac-Lok" posi-ish unit. The rears should have a tag. Or on the top right side of the rear axle, it may have some numbers for you to decipher. Use water, wire brush and cloth to expose these. Don't go nuts w/the wire!
__________________
The only "FINISHED CJ" is the stripped one in a junkyard w/a bent frame.
hutch1200 is offline   Reply With Quote
Unread 11-18-2013, 09:10 PM   #5
talon2
Guest
 
Posts: n/a
Transfer case indicator light wiring location

I have a 78 cj7 three speed. The light on the dash that indicates that you are in 4 wheel drive comes on when I shift into 3rd gear. I obviously have the wire connected to the wrong spot on the transmission/transfer case. From the drivers position I have it connected on top of the transmission on the left.
I see two more possible locations for the switch on the transfer case.
I would like to see some pictures of the correct location of the sending switch.
Also any other info would be greatly appreciated.
Thanks
Terry
  Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.