Dana 20 Rear - 5.38 Gears Odd? - JeepForum.com
 
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post #1 of 10 Old 05-06-2013, 01:21 PM Thread Starter
Balvar24
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Dana 20 Rear - 5.38 Gears Odd?

79 CJ7 - 258, T-150, Dana 20 Transfer

I knew this thing was a dog, but I finally got around to checking the speedometer. 3000 RPM's and I'm doing around 50 Miles per hour on 30" tires. That tells me around 5.38 on the gears. Is this odd? Possibly stock?


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post #2 of 10 Old 05-06-2013, 01:57 PM
jeepwhore
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Quote:
Originally Posted by Balvar24 View Post
79 CJ7 - 258, T-150, Dana 20 Transfer

I knew this thing was a dog, but I finally got around to checking the speedometer. 3000 RPM's and I'm doing around 50 Miles per hour on 30" tires. That tells me around 5.38 on the gears. Is this odd? Possibly stock?
Whats it got for a rear end? M20 I assume? I don't think you can get 5.38's for a M20. How did you check the speedo, GPS?

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post #3 of 10 Old 05-06-2013, 02:03 PM
jp360cj
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Have you made sure the tcase is in high range? The shift pattern is as follows:

4H
2H
N
(2L)
4L

The 2L isn't supposed to be there, but due to worn out linkage the rear output can engage before the front when going to 4L

I mention this bc a friend of mine had a 75 CJ5 and he swore it had 5.38 gears in it. Turns out he had been driving around in 2L. His shifter didn't have the shift pattern on it and someone told him the D300 pattern (which its reversed). I was in 2 wheel drive so he assumed they were correct

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 #4 of 10 Old 05-06-2013, 02:09 PM Thread Starter
Balvar24
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Checked it with GPS app on my phone. Not super duper accurate, I know, but I checked the app against a couple other vehicles. Always within a couple (read 2) of the mechanical speedo.

AMC 20 Rear, not Dana per title(Brain fart).

I thought the same thing about the transfer. It's in 2H.

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post #5 of 10 Old 05-06-2013, 02:12 PM
CSP
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The lowest gear ratio that's ever been available for the AMC 20 is 4.88:1, so no, you don't have 5.38s.
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post #6 of 10 Old 05-06-2013, 02:20 PM Thread Starter
Balvar24
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Interesting.

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post #7 of 10 Old 05-07-2013, 07:34 AM Thread Starter
Balvar24
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Run around in it last night. Low Range - 20-25 MPH @3000 RPM. High Range - 48-50 MPH @ 3000 RPM. Guess I'll put it up on jack stands and start counting.

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post #8 of 10 Old 05-07-2013, 08:02 AM
CSP
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No need to count. The tooth counts should be stamped on the outer circumference of the ring gear.
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post #9 of 10 Old 05-07-2013, 12:06 PM Thread Starter
Balvar24
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I was refering to couting wheel revolutions v/s output shaft revolutions.

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post #10 of 10 Old 05-09-2013, 09:07 PM
Hartfamily
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Mark the tire and mark the drive shaft. Rotate the tire 10 times count drive shaft rotation and divide that number by 5. That will give you ratio. mike
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