Dana 20 'vs' Dana18 Whats the diff? How to tell? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 06-14-2000, 08:40 PM
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Dana 20 \'vs\' Dana18 Whats the diff? How to tell?

Hey Guys,

I have my tranny almost ready for the install and i called Tom Wood for his opinion on the yoke that i use for the output of the transfer case. I mentioned that i had 2 Dana20's sitting side by side and one had a yoke style output and one had a flange style output. He asked me if i was sure the one with the flange was a Dana20, because most flange style outputs came on the 18's. I couldn't tell him yes FOR SURE because i dont have them in front of me. But the 2 look EXTREMELY similar from what i remember. Is there a fool proof way of being able to tell a Dana18 from a Dana20?

Which one is a better transfer case?

The T-18 that was attached to it came out of a FSJ if that helps?

Thanks

Kevin
New England 4x4 Club
http://206.190.221.134/cj7.htm
79 Jeep CJ7
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post #2 of (permalink) Old 06-14-2000, 08:59 PM
 
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Re: Dana 20 \'vs\' Dana18 Whats the diff? How to tell?

Dana 20's have a centered rear output. Dana 18's are offset to the passenger side. You would need an offset diff to run an 18. 18's were only used up until the early '70's (like '71 I think).

'79 CJ-7
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post #3 of (permalink) Old 06-15-2000, 05:39 AM
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Re: Dana 20 \'vs\' Dana18 Whats the diff? How to tell?

Thanks Chris,

What are the pros and cons of the Dana18? Is it worth switching to the Dana20 if the 18 is in fact what i have? Any major reason the 20 is better? I dont know that much about the 18.

Thanks



Kevin
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post #4 of (permalink) Old 06-15-2000, 06:43 AM
 
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Re: Dana 20 \'vs\' Dana18 Whats the diff? How to tell?

The D18 has a 2.46 low range compared to the D20's 2.03. D18 has twin sticks...
But again to run a D18 you would need an offset rear axle. You most likely have D20's if they came out of a J truck.

Heres a link to some tcase info:
http://www.off-road.com/jeep/tech/xfer/

'79 CJ-7
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post #5 of (permalink) Old 06-15-2000, 08:46 AM
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Re: Dana 20 \'vs\' Dana18 Whats the diff? How to tell?

I have a friend running a '67 CJ-5 with D18 and a centered D44 rear axle with no problems. The driveshaft looks a little funny, but it works well and he has run it for years like that. Just FYI.

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post #6 of (permalink) Old 06-15-2000, 04:59 PM
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Re: Dana 20 \'vs\' Dana18 Whats the diff? How to tell?

There is a big writeup in the last, or the month before, issue of four wheel drive and off road about it. I i have a 63 CJ5 with a dana 18 and i love the love range. The dana 18 from the story has the drive shaft attach lower than any other transfercase avaiable in jeeps. It may be of use to run in a newer jeep, because of driveshaft angles, this case would reduce the rear angle. I run a 4 inch lift with no problem of vibrations. And if you put an 18 in a YJ or TJ you can get a license plate from the magazine. [img]/wwwthreads_images/icons/smile.gif[/img] I have also heard that you can run a centered axle in the rear with it and have no problem.

Dan Stewart 1963 CJ5 "Caloosa Jeepers" member

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