1978 CJ7 transmission replacement - JeepForum.com
 
LinkBack Thread Tools
post #1 of 7 Old 07-01-2009, 09:34 PM Thread Starter
CGITCH
Registered User
 
Join Date: Jul 2009
Location: South of the North Pole
Posts: 1
1978 CJ7 transmission replacement

I am really new when it comes to jeeps, especially transmissions. I am looking at buying a '78 CJ7 with a 3 speed transmission, which i found to be a t150. I want to put a 5 speed in it so I have the OD gear for road cruising. What transmissions would work with the least ammount of modification and money spent?

P.S. It is a 78 CJ7 with a 258 ci i6

CGITCH is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 07-01-2009, 10:34 PM
new cal shooter
Registered User
1978 CJ5 
 
Join Date: Aug 2006
Location: sonoma county
Posts: 37
I have the T-18 1st gear is for crawling only, then 2-4 is for road driving, I like it alot, have it in my F-250 also, very good transmission in the manual form, good luck, if you can find one already done GO FOR IT, working on your jeep means not driving it as much
new cal shooter is offline  
post #3 of 7 Old 07-01-2009, 10:48 PM
rustymudder
Registered User
1982 CJ7 
 
Join Date: Jun 2009
Location: Pensacola, Florida
Posts: 290
I just swapped a ford t18 into my 82 CJ7. If you're dead set on an overdrive then the T5 or AX-15 would probably be the cheaper options, but neither is really that strong. My Jeep had the T5 but it couldnt take the abuse of driving off road. The Ford t18 will bolt up to your current bellhousing, but you would need to get an adapter. Go to novak-adapt.com, they have tons of good info transmissions, engines, transfercases, and adapters. I got my T18 to Dana 300 adapter from them and it is awesome.
rustymudder is offline  
post #4 of 7 Old 07-01-2009, 11:29 PM
TBrock
Registered User
1986 CJ7 
 
Join Date: Feb 2009
Location: Colorado
Posts: 195
I'd avoid the T5. Another T18 here and I'm fine without the OD (granny is worth the trade).

Default Jeeper #68
MilitaryJeeper.com
TBrock is offline  
post #5 of 7 Old 07-04-2009, 07:14 AM
hfjeff
Registered User
 
hfjeff's Avatar
1995 YJ Wrangler 
 
Join Date: Jan 2003
Location: Waupun
Posts: 772
What about a T-176? Stronger than a T5 or AX-15, although it still does not have the OD (4 spd).

MINE: 1995 YJ/2.5L/115K/Completely Stock
MY DAD's: 1978 CJ7/ AMC 360 .030" over/ Motorcraft 2100/ Edelbrock Performer/ Proform HEI Ignition/ Hedman Headers with dual Flowmaster 40's/ Taurus Fan/ FK-35 Control/ Painless Harness/ Rebuilt T150 & Dana 20/ 4" Lift/ 31" Procomp Mud Terrains/ All Fiberglass. (SOLD)
MY BROTHER's: 1996 ZJ Limited/5.2L/117K & Completely Stock.(SOLD)
hfjeff is offline  
post #6 of 7 Old 07-04-2009, 01:39 PM
HackFabrication
Registered User
 
HackFabrication's Avatar
1976 CJ5 
 
Join Date: Nov 2007
Location: Canton, Michigan
Posts: 3,196
Quote:
Originally Posted by CGITCH View Post
I want to put a 5 speed in it so I have the OD gear for road cruising. What transmissions would work with the least ammount of modification and money spent? P.S. It is a 78 CJ7 with a 258 ci i6
SIMPLY PUT: None.

NEXT: Would be to swap a T5/Dana300 combo out of a late model CJ7 into your rig. While you at it get all the other stuff from the donor vehicle.

NOW: If you don't mind getting into a bunch of modifications, the NV35xx series 5spd or the AX15 5spd is the way to go with your 258. The NV4500 is a bit of overkill for an I6 CJ, IMHO.

HOWEVER: You will end up adapting them to your Dana 20 transfer case. And you will need to modify the trans mount on the skid plate. Or just replace the crapo OEM skid with a custom fab'd crossmember/skid combo. Driveshafts will need to be modified, as the 5spds are longer than the T150 3spd. Driveline angle may need adjusting also.

THEN: There's the whole question about what size tires you plan on running, as an O/D is gonna be pretty useless on a lapped out 258 with 35" rubber, unless it's geared properly.

"In the end...It's all Hack."
HackFabrication is offline  
post #7 of 7 Old 07-04-2009, 09:36 PM
Renegade79
Registered User
2006 TJ Wrangler 
 
Join Date: Aug 2008
Location: Greenville
Posts: 363
depending on the tire size and gear ratios, the t150 does rather well at 60-65 mph. i was cruising today at highway speed and it wasn't straining a bit with my 31's.

i'd say stick with the 3 speed for a few months and see how it works out for you. its a very strong gear box and i personally really enjoy the feel of it. its like driving a big truck, long shift throws and you can feel each gear engaging when you shift. nothing like driving a TJ IMHO.

'06 Wrangler SE, soft top, hard doors, 2.4L, rolling completely stock and unmodified for the short term...
'10 Wrangler Sport, soft top, hard doors, 23S package, Teraflex 2.5" spring lift, Spidertrax 1.5" wheel spacers. Sold.
'79 CJ-7 Renegade, 258 I6, T150, D20, D30/AMC20, 2.5in Rancho lift, 31x10.5 AT's, TeamRush upgrade, flush tail lights - Sold :'(
Renegade79 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
New 1978 CJ-5 304 V8 2005BlackRubi Jeep CJ Forum 2 10-07-2008 07:36 AM
1978 CJ7 Transmission ?'s buzzzzz Jeep CJ Forum 7 07-11-2008 03:29 PM
Transmission/T case replacement on a CJ5 ickthoose Jeep CJ Forum 5 08-24-2007 07:34 AM
transmission replacement kdub47 Jeep CJ Forum 1 05-01-2003 03:48 PM

Posting Rules  
You may post new threads
You may 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 Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome