cj5 5 speed - JeepForum.com

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post #1 of 7 Old 04-03-2008, 08:10 AM Thread Starter
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cj5 5 speed

Will the t-5 transmission work in a 79 cj5 with 258. It has a three speed now. If so what all has to be changed?

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post #2 of 7 Old 04-03-2008, 09:06 AM
John Strenk
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That's a long trany compaired to a T-150. Your going to have a very very short rear drive shaft and some extream angles to contend with.

Also the bell housing will have to be modified. You can probably find those cheap enough though.
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post #3 of 7 Old 04-03-2008, 09:10 AM Thread Starter
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has anyone ever heard of it being done?
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post #4 of 7 Old 04-03-2008, 09:15 AM
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Well the 80's 5's did come with the SR4, which is the same length as the T4/T5 so it is possible. Your rear drive shaft will be significantly shorter and you will need a dana 300. The skid plate, bell housing, transfer case, and tunnel cover will need to be changed, along with both drive shaft lengths. You could save a few bucks and use a front shaft out of a Cj7 with that combo. But, if you have a lift you will need to go to a CV shaft in the rear.

1977 Cj5, 258, T-18, 2.46:1 Dana 20, 2.5" BDS lift, OBA, 38.5's. Chevy 60 frt, 14b Rear, Full hydro, 102"wb, full DOM cage.
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post #5 of 7 Old 04-03-2008, 09:38 AM
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Originally Posted by ncopp View Post
Will the t-5 transmission work in a 79 cj5 with 258. It has a three speed now. If so what all has to be changed?
Ugh. Even though Jeep installed these in CJ5's in the 80's it was always a marginal trans, IMO.

If you're going to all the trouble to swap an O/D trans into your CJ, why don't you consider a NV3550? It's a medium duty 5sp with O/D, that is way better than any T5 ever installed in a CJ. (Note: The WC T5 wasn't installed in the CJ's, IIRC, and the ratios are different.) The NV3550 was used by Jeep starting in the 2000 TJ's.

Adapt it to your Dana20, or swap in a Dana300 (or Atlas/STaK). As noted there will be driveshaft/crossmember modifications. And some floor pan trimming.

If you don't want the O/D, I'd seriously consider locating a T176/Dana300 combo and swap the whole thing into the CJ. The T18/NP435 swap would be my recommend if you want the 'granny' 1st gearing. If you want something 'in between' the T18/NP435 and the T176, look into a T19.

Good Luck

"In the end...It's all Hack."
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post #6 of 7 Old 04-03-2008, 10:31 AM
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also the ax-15 from a 90's xj or wrangler is of similar if not better strength to the nv and supposedly easier to find parts for. can be adapted to dana300
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post #7 of 7 Old 04-03-2008, 04:39 PM
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I'm going to agree that the Jeep T5 wasn't that great. I know you probably have the T-150 and are really looking for the overdrive. Most tranny swaps that are relatively straight forward are four speeds with a granny low 1st. The problem comes when you try and put an overdrive tranny in a cj5. I was in the same boat with my '79 CJ-5 also. What are you running for tires and gears? I was originally running 33" tires with 3.31 gears. I swithed to 3.54 gears and that combo seemed pretty descent on the highway. I know all the charts say you should be running 3.73's or 4.10's but those people never heard my Jeep scream at 70mph either. Hope I've given you another thing to look at.

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