I have been a Bad Bad Boy - JeepForum.com

 
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post #1 of 12 Old 02-21-2016, 11:13 AM Thread Starter
tumbleweed58
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2013 JK Wrangler 
 
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Cj I have been a Bad Bad Boy

I have a 1985 CJ7 that the T5 trans lower bearing went out in around 2010 and I think it's about time I get it out of storage and repair it. any thoughts on to repair the trans, replace with the same or replace with something else.

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post #2 of 12 Old 02-21-2016, 11:24 AM
RenoF250
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I hate the T5, I have had bad experience with it and my friend that also has a CJ7 had bad experience with his. Some here like it fine. I would replace it with something else. I went with an AX-15 because it is much stronger, fairly straight forward and the bell housing has a CPS mount for the 4.0 I am running.

What you do with your Jeep will determine the best trans, highway you probably want a 5-speed, just rock crawling a 4-speed with LOW first may be the way to go.

1985 CJ7 with 1994 4.6, Dana 44 4.10 TrueTracs
2001 TJ 4.0 Dana 44 4.10 TrueTracs
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post #3 of 12 Old 02-21-2016, 11:28 AM Thread Starter
tumbleweed58
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any info on whats needed to do the AX-15 swap ?
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post #4 of 12 Old 02-21-2016, 11:58 AM
RenoF250
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Quote:
Originally Posted by tumbleweed58 View Post
any info on whats needed to do the AX-15 swap ?
Yeah:
AX-15
Bellhousing
Driveshaft length change
Adapter ring (some say you can get away without this but I think you have to cut the shaft out of the AX)
Pilot bearing
Master/slave for clutch
YJ clutch pedal (you could probably mod yours to work if you have a lathe)
I also changed the flywheel/clutch/pressure plate) since I was going to the 4.0. I don't think you have to do that if you keep your current engine.

1985 CJ7 with 1994 4.6, Dana 44 4.10 TrueTracs
2001 TJ 4.0 Dana 44 4.10 TrueTracs
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post #5 of 12 Old 02-21-2016, 12:15 PM
Ken4444
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Quote:
Originally Posted by tumbleweed58 View Post
I have a 1985 CJ7 that the T5 trans lower bearing went out in around 2010 and I think it's about time I get it out of storage and repair it. any thoughts on to repair the trans, replace with the same or replace with something else.
A properly built and installed T5 should be fine for light duty driving. Unless you have other requirements, then I'd stick with the T5.

"I give you a republic, if you can keep it." - Benjamin Franklin
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post #6 of 12 Old 02-21-2016, 01:14 PM
keith460
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Keep the T5 and change axle ratio to a more favorable 3.73 or 4.10's for those 32" tires and your T5 will survive.

.
1984 CJ-7 Renegade
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post #7 of 12 Old 02-21-2016, 01:15 PM Thread Starter
tumbleweed58
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Light wheeling only but I have not been able to find a good T5
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post #8 of 12 Old 02-21-2016, 01:44 PM
RenoF250
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Quote:
Originally Posted by keith460 View Post
Keep the T5 and change axle ratio to a more favorable 3.73 or 4.10's for those 32" tires and your T5 will survive.
My Jeep has 32s and 4.10s and still killed the T5 and that was with the 258. I am not hard on it either. It is just a wimpy transmission IMHO. My friend with the CJ7 has had to rebuild his 3 or 4 times and he just has the 258 as well.

1985 CJ7 with 1994 4.6, Dana 44 4.10 TrueTracs
2001 TJ 4.0 Dana 44 4.10 TrueTracs
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post #9 of 12 Old 02-21-2016, 10:37 PM
only in a jeep cj
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I like both the T5 and the NV3550 because the are geared the same. Ive been driving CJs since 1990 and drive them pretty hard....hard as in spinning tires off the line, hard accelerations, interstate speeds (75mph plus), hammering it on rock climbs, pulling people out, towing, etc....all the stuff you "aren't suppose" to do with a CJ. T-5s in several CJs ranging from stock tires and gears (29s and 3.31s) to more trail worthy (33s and 4.10s) and in all these years Ive only blown one and it was 3rd gear with the WRONG gears for my tires ....had 2.72 axle at that time. I was on the street and accelerated slightly harder than normal. If these transmissions were so bad, I would have blown like 10 of them over the last 26 years...with the way I drive anyway.
So why do I still like them?
They are easy to rebuild, they are "stock" so they bolt right in with all existing parts, they shift nice with a spring loaded center return shifter, and they are / were easy to find.
Ive been saying for some time that they are sensitive to bearing/gear load via wrong axle gears. I know that's why mine blew because months earlier that same trans was in a rock crawler with zero problems. All that said, IF IF IF Im not staying stock, my go to 5 speed transmissions are the AX15 and NV3550. You don't have to mod the bell housing to run the CPS in the factory location for injection / 4.0 swaps. I do like the hydraulic clutch set up and the throw out arm is a second class lever vs the CJs first class. They are stronger, yes, but have a few draw backs. They cost more, they are harder to rebuild, the bell housing is attached before the install so its a harder install, and stock parts such as trans mounts and driveshafts are changed. But they have a better track record and are easier to find due to the numbers out there.

Ed
1975 CJ-6 1983 CJ-8
1986 CJ-7 Laredo 1986 TJ-7 Trail Jeep
2003 Inca Gold TJ Rubicon
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post #10 of 12 Old 02-22-2016, 08:48 AM
shadoow
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Quote:
Originally Posted by tumbleweed58 View Post
Light wheeling only but I have not been able to find a good T5
the best T5 you can find may be yours. They are relatively easy to rebuild and there are resources that can help you (e.g. this forum, FSM, directions that come with a rebuild kit, internet, etc.). At least you'll know what you got when you're done.

another alternative for a little more robust trans is a T176 or T177. Downside is you'll have the driveshafts/bellhousing/tranny cover/etc. issues like you would with other replacements mentioned. They are also pretty easy to rebuild.

Be aware of any tranny that is advertised as 'rebuilt' which can mean many things. Ask for receipts, who did the work, do an inspection, bench test that it shifts into all gears and the input/output shafts respond accordingly, etc.
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post #11 of 12 Old 02-22-2016, 06:27 PM
LumpyGrits
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Quote:
Originally Posted by keith460 View Post
Keep the T5 and change axle ratio to a more favorable 3.73 or 4.10's for those 32" tires and your T5 will survive.
THAT'S a fact-
I've been run'n a T5 for almost 31 yrs in mine.
LG

Have'n you along, is like loose'n 2 good men
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post #12 of 12 Old 02-22-2016, 07:54 PM
258
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Cj

Got the T5 with 3:73 gears and it runs strong. Did the TR upgrade and that gave me slightly more RPM's. This is with 31x10.5x15 tires.

I will re-gear to 4:10 ratio when I get 33x12.50x15 tires but I still have plenty of time left on my tires.
Unless you are going" Mr. Toad's Wild Ride" in your CJ, the T5 is a good bet. Have yours REBUILT.
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