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ryan_289 06-27-2013 09:36 AM

82 CJ7 4 speed transmission issue.
A buddy of mine recently bought an 82 CJ7 with the 258 6 cyl engine. It has a 4 speed manual transmission in it that pretty regularly will jump out of first gear. He got a "suposedly" good 4 speed transmission in the deal but we are trying to find out what it is. It is a Borg Warner but the only numbers we see on it are 13-51-097901, 13-52-065-904, and 13-51-066-902 on it.

I would really like to know if this is the same as whats in it. If its different we dont want to step down in grades of trannys.

Dudman5703 06-27-2013 09:50 AM

The 4 speeds were usually the T4 1982-+( Which I have in my CJ7 ) and the SR4 1980-1981

Both really weak

"Typical Borg Warner casting numbers found on the T4 are 13-51"

walkerhoundvm 06-27-2013 09:52 AM

Information we need to know:

1) Describe the shift patterns of both transmissions.

2) Describe the shape of the shifter - straight up and down, or dog-legged.

Pictures of the tranny may also help, but I bet we'd be able to figure it out with the above information.

Three different four speed transmissions were used during the early 80s. Most likely what you have in there is a T4. What you might have as a spare could be either an SR4, a T4, or a T176 (in order of strength and desirability, worst to best).

^^Edit^^ you'll hear "really weak" a lot. The SR4 is considered weak, but plenty of people still have them. The T4 is considered an upgrade from the SR4, it's dependable for daily drivers but not quite as strong as the T176, which seems to be preferred for wheeling and serves as a durable transmission for daily driving, as well. All can be thought of as acceptable transmissions depending on how they're used and abused.

LumpyGrits 06-27-2013 09:55 AM

Whit those #'s, I'll bet you it's a T-4.
It's rebuild time. The 'holding' ring is worn and letting it jump out of gear.

Dudman5703 06-27-2013 09:56 AM

I wouldn't rebuild either transmission, look on CL, I got another T4 for $100. Rebuilding it will cost much more.

texasdave 06-27-2013 10:01 AM

With those numbers it appears it is a t-4 transmission. Described as a light duty transmission. What do you plan to do with it? Heavy duty transmissions include the SM-420 Sm-465 NP 435 The T176 is rated as a medium duty xmsn. Go to Novak adapters and read their articles on transmissions and it gives descriptions and other information.

ryan_289 06-27-2013 03:32 PM

This will mostly be for running around town and light duty huntin/trail riding. Current tires are 33 12.50 and most likley will not go bigger. Ill check Novaks site to see if I can determine what we have.

Do all of the most likely transmission have about the same first gear ratio? The jeep runs fine as is but I think it would benefit from a lower first gear or different axle ratio.

LumpyGrits 06-27-2013 03:36 PM

Do you know your R&P?
With 33's and a 4speed, 4:10's take allot of load off the tranny.

ryan_289 06-27-2013 03:41 PM

Not sure on gear ratio. Im going to get him to look for a tag on the differential housings.

LumpyGrits 06-27-2013 03:46 PM

On the OEM mod 20 rear, there is a letter code stamped into the rear of the housing on the rear axle near the cover on the P/side.

ryan_289 06-27-2013 03:58 PM

Thanks! Will take a look.

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