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Unread 12-21-2012, 05:57 AM   #1
highred
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How do I Determine what model Transmission I have?

I have a '79 CJ7 with a 258 I6. All I know is that the transmission is a 3 speed. How do I determine what model it is? I know nothing about transmissions but I would like to know the various types available to my year CJ. I want to learn more so I know what I have AND so I can service/repair it correctly when needed.

Is there a resource for learning more about CJ transmissions?

Thanks,

Rob Caldwell

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Unread 12-21-2012, 06:04 AM   #2
VooDoo2
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There isnt that many options. Is it Auto or manual? Do you have quadratrac?
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Unread 12-21-2012, 06:30 AM   #3
78FordF150
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Factory three speed manual, is a T150.
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Unread 12-21-2012, 06:35 AM   #4
shadoow
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here's a link for good general information. Look under the 'Knowledge' section on the left side then browse the manual transmissions to see what's available for your year jeep. There's good info on how to identify what trans you have.

http://www.novak-adapt.com/about/history.htm

another way is to decode your VIN, assuming your trans is original to your jeep. Just do a search on this forum for VIN coding.
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Unread 12-21-2012, 07:11 AM   #5
highred
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Quote:
Originally Posted by VooDoo2 View Post
There isnt that many options. Is it Auto or manual? Do you have quadratrac?
It's a manual. What's a "Quadratrac"?

It looks like some other may have answered my question. Thanks.
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Unread 12-21-2012, 07:31 AM   #6
82JeepCJ7
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Autos commonly had the quadracrap transfercase after them. You can spot them easily by the offset rear axle, and a knob on the dash along with about 2 miles of leaky vacuum hose.
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Unread 12-21-2012, 07:37 AM   #7
CSP
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Only '76-79 CJ7s with automatics had the Quadratrac transfer case, so if you have a manual you don't have it.

The '79 three speed as said, would be the Borg Warner T150 with a Dana 20 transfer case behind it.

Lots of Jeep specific equipment data can be found here: www.jeeptech.com
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Unread 12-21-2012, 07:52 AM   #8
highred
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Ok. I could not find any "VIN Coding" after searching this site. So I Googled it and found this site: http://www.jeepz.com/forum/vin.php

When I did the search, I receive the following results:

Year: 1979
Plant / Transmission: Toledo, 3-speed, Left Hand Drive
Model: JEEP®, 94 inch Wheelbase,
Gross Vehicle Weight (GVW) Rating: 4150 lbs GVW, models 83, 84, & 93
Engine: 6 Cyl, 258 CID, 2 Bbl.

It does not tell me if it is a T150. But, after reading the Novak site, it did tell me that:

The T150 was strong, and the last of the Jeep three-speeds

- Compatible with AMC engines and adaptable to GM and Ford engines
- Iron case and top cover. Close-ratio first gear with direct-drive in third-gear
- Fairly strong and extremely compact
- Compatible with the Dana 20
- 1976-1979 Jeeps

All good information.

What I am most concerned/interested in knowing is how to service this transmission and determine its useful life. I am fortunate that I was able to track down the original owner and learned that the engine was rebuilt at 80K miles. The total miles on the Jeep today id 147K and there has never been any trouble with the transmission. I am also wondering about the life of the clutch as it has never been replaced.

Since I am doing a frame off restoration, I would like to be able to do as much as I can to the transmission now as it is easy to access.

Thanks,

Rob Caldwell

Last edited by highred; 12-21-2012 at 08:28 AM..
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Unread 12-21-2012, 08:06 AM   #9
CSP
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Useful life will depend on how it was treated. If it shifts fine there really is no reason to tear into it. Give it a fresh bath of fluid and it will probably live a long life. Most of the time they get swapped out not because they are bad or worn out, but because the first gear is so high and not really conducive to four wheeling where you need to crawl along slowly.
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Unread 12-21-2012, 08:29 AM   #10
highred
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Quote:
Originally Posted by CSP View Post
Useful life will depend on how it was treated. If it shifts fine there really is no reason to tear into it. Give it a fresh bath of fluid and it will probably live a long life. Most of the time they get swapped out not because they are bad or worn out, but because the first gear is so high and not really conducive to four wheeling where you need to crawl along slowly.
What's the best fluid to put in a 147K T150?
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Unread 12-21-2012, 09:30 AM   #11
bigjoe
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Quote:
Originally Posted by highred View Post
What's the best fluid to put in a 147K T150?
Replace with what factory calls for the T-150. Most likely a gear oil like 90 weight. Sorry can't recall what the shop book calls for off the top of my head.
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Unread 12-21-2012, 10:30 AM   #12
CSP
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GL4 rated gear oil in the weight of your choice.
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Unread 12-21-2012, 10:54 AM   #13
highred
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Thanks. I just read that GL5 is not good at all for T150's. But that there is some information floating around out there that says to use it.
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Unread 12-21-2012, 01:47 PM   #14
james04si
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There are some GL-5 that is safe for yellow metals and can be used. The t-150 has brass syncro rings and regular GL-5 is corrosive and will damage them over time. It's best to just go down to your local napa and pick up a gallon of GL-4 for $20. You can use it in both the tranny and transfer case just not the differentials as GL-4 is not for hypoid gears or something like that.
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Unread 12-21-2012, 05:51 PM   #15
dslywalker
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The GL-5 with the MT-1 rating is okay from what i've been reading
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