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Unread 05-12-2011, 04:30 PM   #1
tlannom
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1986 CJ7 
 
Join Date: Aug 2004
Location: Nashville, TN
Posts: 94
No 3rd or 4th gear

I lost 3rd and 4th gear today on my 86 CJ7. It has a G-Force T5 5 speed transmission. First, second, fifth and reverse all work fine. Any ideas what the problem is? I would love for someone to come on the forum and tell me there is a reset button.

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'86 CJ7 Laredo, LS1 Corvette engine, AX15 transmission, Dana 300 4:1 twin-sticked, RE 4 1/2" lift, YJ cage, Bzerk front/ rear bumpers
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Unread 05-12-2011, 05:00 PM   #2
Coiz
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1979 CJ7 
 
Join Date: Mar 2008
Location: Northern, IL
Posts: 4,169
Well, they share the same synchronizer and shift fork so that would be a good place to start. If it was a slow grinding death, I would suspect the synchro. If it was working fine then made a noise and quit, I would suspect the shift fork.
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1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
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Unread 05-12-2011, 05:10 PM   #3
tlannom
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1986 CJ7 
 
Join Date: Aug 2004
Location: Nashville, TN
Posts: 94
Quote:
Originally Posted by Coiz View Post
Well, they share the same synchronizer and shift fork so that would be a good place to start. If it was a slow grinding death, I would suspect the synchro. If it was working fine then made a noise and quit, I would suspect the shift fork.
Everything was working fine, then it popped and went out. Is the shift fork difficult/ expensive to repair? Thanks for the help.
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'86 CJ7 Laredo, LS1 Corvette engine, AX15 transmission, Dana 300 4:1 twin-sticked, RE 4 1/2" lift, YJ cage, Bzerk front/ rear bumpers
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Unread 05-12-2011, 05:17 PM   #4
Coiz
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1979 CJ7 
 
Join Date: Mar 2008
Location: Northern, IL
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I would pull the cover and see what you've got before you go ordering parts but a 3-4 shift fork should cost you around $20. There are 3 on eBay for $17.50 + $5 s&h.

Look at pages 3-4 and 3-7 in the T5 Rebuild Manual for the parts in question.

Better yet go to Morris4x4 and look at numbers 17 and 39. My guess is you will need the 3-4 shift fork number 39.
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1979 CJ7, FI 5.0L Ford, NP435, D300, Full floated D44 Detroit, D30 Detroit EZ Locker.
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Unread 06-08-2011, 08:17 PM   #5
tlannom
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1986 CJ7 
 
Join Date: Aug 2004
Location: Nashville, TN
Posts: 94
Update: I finally got around to pulling the transmission out. Turns out I broke the main shaft right behind the 3rd and 4th gear syncros. Definitely not going back with a T5. Probably going with a NV4500 or SM465.
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'86 CJ7 Laredo, LS1 Corvette engine, AX15 transmission, Dana 300 4:1 twin-sticked, RE 4 1/2" lift, YJ cage, Bzerk front/ rear bumpers
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