T14/Dana 20 vs T176/Dana 300 - JeepForum.com
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post #1 of 6 Old 12-27-2007, 10:23 PM Thread Starter
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1973 CJ5 
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Location: Indiana
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T14/Dana 20 vs T176/Dana 300

I'm working on building a CJ5 and have two tranny/transfer case combination possibilities. I've got about $200 in new parts for the T14/D20, but am thinking about going with the T176/D300. How much of an advantage do you think going with the T176/D300 would be? It would allow for lower gearing and should result in better fuel economy since it is a 4sp instead of a 3sp.

Transmission 1st 2nd 3rd 4th Rev
T-14 3.10 2.61 1.00 3.10
T-176 3.52 2.27 1.46 1.00 3.52

Dana 20 2.03:1
Dana 300 2.62:1

tell me what you think

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post #2 of 6 Old 12-27-2007, 10:32 PM
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1977 CJ7 
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I'd go with the 176/300 for the better gearing. It's not only lower, but 2nd 3rd and 4th are a lot closer than 2nd and 3rd on the 14. I've got a t150 and my biggest gripe is the power loss from 2nd to 3rd. It'd be really nice to have that extra gear to keep it in the power band. It's not as bad since i ditched the 258 for a 360, but with that 6 cyl i had to wind out 2nd to have any power in 3rd

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
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post #3 of 6 Old 12-28-2007, 12:45 AM
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Both T-14 and T-176 trannies have 1:1 high gear ratios so there should be no difference in gas mileage. Also, T-176 is stronger than the T-14.
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post #4 of 6 Old 12-28-2007, 05:22 AM
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1971 CJ5 
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Location: Eagle Point
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T 14's in my experience, won't hold up well to any power or abuse. The 176 is a much stronger trans. The bell bolt patterns will be different as well, so you may need to swap/adapt to get one or the other to fit. Fuel economy will be about the same either way.
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post #5 of 6 Old 12-28-2007, 05:29 AM
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1976 CJ5 
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Location: Canton
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T176/300 combo. Hands down. Just a better pairing of gears. Plus the 300 has more aftermarket 'options' than the 20 does.

"In the end...It's all Hack."
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post #6 of 6 Old 12-28-2007, 08:47 AM
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1980 CJ5 
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Location: Hawaii
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Your T-176 could very well be a T-177 which means that it will have a 3.82 first gear. Check the numbers on the tag on the passenger side front of the case.

5359389 = T-177
5359390 = T-176
Attached Thumbnails
T-177 ID.JPG  
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