3 speed? 4 speed? what do i have? - JeepForum.com
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post #1 of 17 Old 05-25-2013, 10:50 AM Thread Starter
58m327cj5
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3 speed? 4 speed? what do i have?

just recently bought a 58 cj5. its got a chevy 327 tucked in it and im confused on what tranny it has? still has twin stick transfer case and reverse is all the way left and up. help please?

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post #2 of 17 Old 05-25-2013, 11:07 AM
dmill89
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Originally Posted by 58m327cj5 View Post
just recently bought a 58 cj5. its got a chevy 327 tucked in it and im confused on what tranny it has? still has twin stick transfer case and reverse is all the way left and up. help please?
Since the 327 was not a stock engine in the CJ5 (especially in 58, CJs weren't offered with a V8 until 1972 and then it was an AMC 304) the transmission could be just about anything depending what was done when the Chevy engine was swapped in. If it is a manual you should be able to tell whether it is 3 or 4 speed by running through the gears. If you want to know the specific model of transmission you'll probably have to crawl under and check the tags/numbers stamped into the housing.
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post #3 of 17 Old 05-25-2013, 12:16 PM
jeepdaddy2000
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Take a couple of pictures and post them.
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post #4 of 17 Old 05-25-2013, 11:01 PM
mmerlinn
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Pull numbers off your transmission (probably no tag since it is a Chevy) and do a Google search. Unless you have something no one else has ever had, that should produce reams of info about the transmission.
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post #5 of 17 Old 05-26-2013, 09:30 AM Thread Starter
58m327cj5
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i will post some pictures asap and i dont know what speed it is because half the time it wont go into first. and they are all so close together its hard to tell what is what. ps. can anyone tell me what ratio might have come stock in my rear end?
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post #6 of 17 Old 05-26-2013, 09:39 AM
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Stock would be 4:88 or 5:38. Again, many times with a drivetrain swap comes a gearing swap. I would suggest dropping one (or both, no reason not to insure the ratio's match and do a damage inspection) of the covers and do a tooth count to verify. Might not be a bad time to put some clean oil in there.
FYI, the front knuckles take oil as well. Many times the seals go bad and the oil leaks out, leaving the joint and bottom kingpin bearing dry. If you happen to fill them and they do leak, the seals are cheap and a 50/50 mix of oil and grease in the knuckle will insure a good seal.
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post #7 of 17 Old 05-26-2013, 09:43 AM Thread Starter
58m327cj5
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yes my top speed is not the best. im getting about 50 mph at 2,000 rpm in 4th and for a v8 thats pretty high for a long period of time so i deffinatly need to get a lower ratio unless theres something i can change when i get my transmission rebuilt? i pulled the numbers gm 3884685 and am about to search them on google
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post #8 of 17 Old 05-26-2013, 10:55 AM
mmerlinn
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I did a search ("3884685" transmission) and am now totally confused

According to your numbers (taken off of a SIDE cover???) you have a Muncie car transmission in your Jeep.

So, are you sure that those numbers are correct? If they are, you have an aluminum case with a 7-bolt aluminum side cover transmission. And it is one of the early M20, M21, or M22 Muncies.

What I don't understand is how it is attached to the transfer case since those Muncies never were installed in a 4x4s. Best I can guess is that someone fabricated a special adapter to mate the two together.
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post #9 of 17 Old 05-26-2013, 12:57 PM Thread Starter
58m327cj5
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yes i took the number off the side cover. i will double check the numbers and is there anything i can look at to confirm what your saying?
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post #10 of 17 Old 05-26-2013, 01:20 PM Thread Starter
58m327cj5
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ok guys sorry for all the confusion. those first numbers 3884658 came off the driver side and were the only numbers there.
there are three more located on the passenger side of the transmission.
the biggest above the patend number are these 3851325
the patend number is 388335
and the smallest set of numbers on the passenger side are mounted virticaly nearest the flywheel are 3872444
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post #11 of 17 Old 05-26-2013, 06:56 PM
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What I don't understand is how it is attached to the transfer case since those Muncies never were installed in a 4x4s. Best I can guess is that someone fabricated a special adapter to mate the two together.
Muncie 4 speeds were a common swap in the early days. Adapters are still available for them.
http://www.polyperformance.com/shop/...t-p-20692.html
They have fallen out of favor with the popularity of truck 4 speeds and the rising cost of the car four speed tranny's.
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post #12 of 17 Old 05-26-2013, 08:10 PM
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Originally Posted by jeepdaddy2000 View Post
Muncie 4 speeds were a common swap in the early days. Adapters are still available for them.
http://www.polyperformance.com/shop/...t-p-20692.html
They have fallen out of favor with the popularity of truck 4 speeds and the rising cost of the car four speed tranny's.
Yep, and a V8 Jeep with a Muncie 4 speed is a kick to drive...on the street!
Not so good off road, as 1st gear is only about 2.20 or thereabouts...

"It's better to have loved and lost, than to live with a psycho the rest of your life"
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post #13 of 17 Old 05-26-2013, 09:28 PM
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Originally Posted by colojeepguy View Post
Yep, and a V8 Jeep with a Muncie 4 speed is a kick to drive...on the street!
Not so good off road, as 1st gear is only about 2.20 or thereabouts...
And it only gets better when the linkages gets full of mud and the transmission won't shift
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post #14 of 17 Old 05-27-2013, 12:39 PM Thread Starter
58m327cj5
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sometimes it dosent want to find first gear and im not sure what to do, but yes it is a blast to drive i just wish it did faster than 55 and didnt leak so much from the tranny
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post #15 of 17 Old 05-27-2013, 06:24 PM
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Originally Posted by 58m327cj5 View Post
sometimes it dosent want to find first gear and im not sure what to do, but yes it is a blast to drive i just wish it did faster than 55 and didnt leak so much from the tranny
Install and OD. Personally, I believe they are marginal behind a V8, especially with a heavy footed driver. They do however, install in about an hour and require no special modifications. If you understand it is there and don't abuse it, they will last.
Regear. This is the best, but most expensive option. Dropping to 3.73 (D27) or 4.27 (D25) will garner you lower RPM's. A swap to a D30 will give you not only a front disk option, but gearing down into the 3.50 range.
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