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Unread 02-26-2015, 06:30 PM   #1
jason280
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Jeep T150 & Dana 20 trans/case combo?

What's the general consensus on the T150 3-spd trans and Dana 20 transfer case? How happy would it be behind a fuel injected 4.0L? Any reason to go with this trans over a T5?

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Unread 02-26-2015, 07:02 PM   #2
CSP
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What's your use of it going to be?


First gear in the T150 is a miserably high 2.99:1. It's fine for the road, but terrible offroad if you want to go slow and in control. It's a strong transmission, especially compared to the T5. Low range in the D20 is higher than the D300.
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Unread 02-26-2015, 07:11 PM   #3
b613
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Yes, What CSP said is all true... I had a T150/20 combo behind my 304 for years.. Pretty strong setup. 1st gear is high but if you don't crawl a lot you probably wont care. Mine always shifted nice and was pleasant to drive. I really like the way reverse was straight up and first was straight back......If you ever had to rock it out of snow or mud it was very easy to do... Just my opinion.
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Unread 02-26-2015, 07:29 PM   #4
jason280
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The CJ I'm considering for will be nothing more than a cruising Jeep, occasional trails with no rocks and very little mud. I realize that in this scenario, a T5 would likely be fine, but I am just concerned about its longevity behind a 4.0L.
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Unread 02-26-2015, 07:36 PM   #5
weaverkb
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I don't think the 4.0 could ever doing anything to hurt that tranny. It's pretty stout and put up with V8 power very well.
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Unread 02-26-2015, 07:59 PM   #6
jason280
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Are you referring to the T150 or T5?
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Unread 02-26-2015, 08:17 PM   #7
weaverkb
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The T150. The T5 is a light duty transmission. Some people have decent luck with it, others, not so much.
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Unread 02-27-2015, 08:24 AM   #8
HackFabrication
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Quote:
Originally Posted by weaverkb View Post
The T150. The T5 is a light duty transmission. Some people have decent luck with it, others, not so much.
T150 would be fine for what your intended use is.

Most T5's die from large tires and poor axle gearing. Throw in improper maintenance, big torque monster engines, bad driving technique, etc. and they will grenade. But that can also happen to any gearbox.

FWIW: I personally know a local CJ7 owner that has the I6 with Mopar EFI, T5, Dana 300, and runs 33'-35's. He has had his Jeep over the Rubicon, Moab, and other trails. Plus he routinely drives it on the streets and highways. His T5 (with proper axle gearing) has held up fine.
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Unread 02-27-2015, 08:26 AM   #9
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Quote:
Originally Posted by HackFabrication View Post
T150 would be fine for what your intended use is.

Most T5's die from large tires and poor axle gearing. Throw in improper maintenance, big torque monster engines, bad driving technique, etc. and they will grenade. But that can also happen to any gearbox.

FWIW: I personally know a local CJ7 owner that has the I6 with Mopar EFI, T5, Dana 300, and runs 33'-35's. He has had his Jeep over the Rubicon, Moab, and other trails. Plus he routinely drives it on the streets and highways. His T5 (with proper axle gearing) has held up fine.
This^. I wouldn't be scared of using the T5 as long as your tire size and axle gearing are properly matched.
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Unread 02-27-2015, 12:46 PM   #10
jason280
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I'm not sure of the gearing, but I'm pretty sure its in the 3.0x to 3.2x range (can't recall what was stock in an '85 CJ). I won't be running anything over 31-10.50s, and I'm pretty easy on the throttle. The T5 just makes me a little nervous, especially considering it has 150k+ miles. On the other hand, I really want to keep my 300, and that would require an adapter with the 150. Decisions, decisions...
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Unread 02-27-2015, 02:30 PM   #11
HackFabrication
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Originally Posted by jason280 View Post
I'm not sure of the gearing, but I'm pretty sure its in the 3.0x to 3.2x range (can't recall what was stock in an '85 CJ).
Most likely it has the 2.73.

Look for the code on the axle. The code is stamped on the housing boss to the left of the diff cover right near the axle tube:

Wide Track AMC 20
Code Gear Ratio Diff Type
D 2.73 Open
DD 2.73 Trac-Lok
B 3.31 Open
BB 3.31 Trac-Lok
A 3.54 Open
AA 3.54 Trac-Lok
H 3.73 Open
HH 3.73 Trac-Lok
C 4.10 Open
CC 4.10 Trac-Lok

JMHO: AMC built a lot of the mid-late 80's CJ's with the 2.73 axle ratio. Which if your's is one, I would probably stay 29-30" on the tires if you want to use 5th on the highway.
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Unread 02-27-2015, 02:53 PM   #12
jason280
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Now that you've mentioned it, I'm pretty sure it has 3.31s...I vaguely recall seeing that when I was pulling the rear axle to remove the transmission and TC.
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