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Unread 06-28-2013, 07:49 PM   #1
zeronight
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tranny go BOOM! now what?

so last weekend we were camping and coming back from a float trip the tranny explodes. all that still works is 4th gear. shes a 82 cj7 all stock, 258 , t5, dana 300, amc 20 and dana 30. sitting on 33x12.5x15s and still has stock 3.27 gears. im torn as what to do next. 1. i know the t5 is weak but this was the original tranny and ive owned this jeep since 07. i cant find many if any replacements locally, i would like to swap in a t176 but that would require adapters and new drive shafts (money i dont have) i would almost like to drop in a auto slush box but i dont really know what that would entail. then in the back of my mind is a thought to just get this one rebuilt or find a different t5 and swap it in and sell the old girl. im looking for suggestions.
thanks

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Unread 06-28-2013, 07:55 PM   #2
keith460
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33" tires and 3.27 gears is your problem for trans not holding up. To much strain on that Borg-Warner T5.

If it were me, rebuild the T5 (easy) and then save up some money for new gear sets front and back in either 4.10's or better choice of 4.56's ratio.
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Unread 06-28-2013, 07:59 PM   #3
zeronight
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so my best bet is to stick with the t5 and regear? the idea of the regear scares me, ive never done that before. how difficult would you rate it?
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Unread 06-28-2013, 08:06 PM   #4
keith460
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T4 and T5's usually fail due to low gear ratio trying to turn 33" tires and you only have 2.73 gears (worse scenario). Upping the gear ratio to something that will relieve the T transmissions will help it live a long and happy life. AMC20 original 2 piece axles will also benefit with the load taken off through axle gearing.

I have to admit though, axle gear changes are not for the novice mechanic to do. T4 or T5 transmissions yes, rebuild kits are around $200.00 for the trans. Set of gears per axle are about the same but labor will kill you at around $300-$600 depending on area and shop.
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Unread 06-28-2013, 08:19 PM   #5
lucdog
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On a scale of 1 to 10. Ten being the hardest, your looking at a solid 9, some would say its a 12. This would be for the first time you did it. After 8 or 10, it's a 2 or 3 at best.

Google what tools are needed, access to a hydraulic press is most likely the biggest Obstacle
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1957 WILLYS pickup, needs work.
1973 J 4000,
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1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
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Unread 06-28-2013, 08:27 PM   #6
lucdog
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In addition to the the cost Keith mentioned, 2 new/used carriers for 3.73 and over gears. ( New carrier for the AMC 20 above 2.73, and 3.54 for the Dana 30) ,2 master install kits.
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1957 WILLYS pickup, needs work.
1973 J 4000,
1978 CJ7 DD.
1979 CJ7 360, TH400/Quadratrac trail Jeep.
1979 J20
1980 CJ5 trail Jeep.
1983 CJ7 pretty weekend and sometimes to work Driver in the summer, My first rebuild, if the Q-trac and 5 are broke, this one is the one to take. its just as capable as the other 2, except nice paint.
1984 Grand Wagoneer, 1 ton axles, great 360/727, and a big a$& tree fell on it .
1989 YJ the CJ to YJ conversion.
2005 TJ Rubicon.
2011 Grand Cherokee Laredo 4x4, Mrs. LUCDOG's DD.
Lots of parts not for sale, i'm a hoarder.
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Unread 06-28-2013, 08:47 PM   #7
LumpyGrits
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Been run'n a T-5 for 28+ yrs. R&P's are 4:88 and run on 33" BFG A/T's.
Bought a spare T-5 from a buddy for $250.00 about 22 years ago. Rebuilt that one(really didn't need much)and put it in my Jeep because mine had a bad leak. Rebuilt mine for $125.00 in parts and it's still sit'n on the shelf.
Take the torque load off of them, and they do fine.
LG
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Unread 06-28-2013, 09:14 PM   #8
zeronight
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this is all very helpful.
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Unread 07-02-2013, 10:06 PM   #9
zeronight
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any thoughts on swaping in an automatic?
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Unread 07-02-2013, 10:51 PM   #10
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Not sure what "adapters" you're thinking would be required to swap in a T176. The only difference is the bellhousing and possibly the driveshaft lengths.

An auto is going to require a flexplate, shifter, and driveshafts at a minimum in addition to the transmission. It could be more depending on which auto you're considering.
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Unread 07-03-2013, 06:50 AM   #11
keith460
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Quote:
Originally Posted by zeronight View Post
any thoughts on swaping in an automatic?
Ah, come on, it's a Jeep! Who wants to drive around in a CJ that doesn't have a manual transmission.... old women, that's who.
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Unread 07-03-2013, 06:58 AM   #12
rbunch4468
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You've been running the T5 successfully with your setup since 2007....I would buy a Master rebuild kit and just rebuild it without regearing. I broke my T4, and found a used T5 for pretty cheap. When I put it in, it was grinding second....I taught myself how to do my first ever tranny rebuild. If I can do it, nearly anyone can! Plenty of documentation, parts will run about $150, and you get bragging rights around the neighborhood for the rebuild project. Take your time, take pictures, and write in to the Forum for advice....I also bought an Amazon book specifically on rebuilding and maintaining T4 and T5 trannys. Go for it!
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Unread 07-03-2013, 07:01 AM   #13
keith460
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There are PDF files floating around here on the forum and others website on complete rebuild manuals for both the T4 and T5 transmissions. I know I have a least three of them.

PM me and I can send you via E-mail the PDF files.
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Unread 07-03-2013, 07:11 AM   #14
hutch1200
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http://jeeptransmissions.com/index.html
This guy is in the middle of Pa, and ships. Tim did my axle re-gearing, went thru my 20 x-fer case and gave the thumbs up on my T-18. I highly recommend him. Tell him I sent ya. He's likely got 1 on the shelf.
Am I gonna get in trouble for recommending a vendor?
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