Thinking of swapping in a T-5 -
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post #1 of 4 Old 11-16-2011, 05:55 PM Thread Starter
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1981 CJ7 
Join Date: Jul 2011
Location: White Pine
Posts: 199
Thinking of swapping in a T-5

Hi guys. The synchros are getting bad in my 4 speed tranny.Not sure which 4-speed it is all I know for sure is I have the Dana 300 transfer case which I believe narrows the field a little. Also the clutch set needs replaced. I can pick up a T-5 in good condition for $350 and hopefully a little cheaper once i get face to face and talk to the guy. What I am wondering is would this be a pretty much direct swap? or would i end up with a laundry list of other stuff i would have to change?

For instance the clutch linkage,skid pan and of course the Trans mount. Or anything anybody knows of that would make this a non-direct swap. I dont have A whole lot of money I can spend besides the cost of the tranny and a new clutch kit for it. I am intending to put the new clutch in before i mount the tranny.If this is going to be more parts and more trouble than its worth then I will look at finding a different tranny that would bolt right up or check some pricing on repairs for my current 4 speed.

I would really like to have the 5 speed for hopefully better fuel mileage but I need to be as cost conscious as I can either way i go.Thanks in advance for any help or suggestions you fellas may have. The skinny on my cj is...1981 with the 258 and the affore mentioned 4-speed. everything is stock on my 7 mechanically no major mods as of yet.

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post #2 of 4 Old 11-16-2011, 07:41 PM
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1983 CJ7 
Join Date: Apr 2010
Location: Raleigh NC
Posts: 720
The T5 WILL be the weak link in your drivetrain (unless you have 2 piece axles still), if you plan on tires 31" or less and only occasional trail use go for it. I have one and it does well. $350 is steep, even in good used condition I would budget about $350 for a rebuild kit. $350 is stupid for one with a worn out input bearing, trashed synchros and shift pads and thrust issues. if the input shaft wiggles even a little offer $100 and tell the seller you are considering it as a core for a rebuild. Good luck!
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post #3 of 4 Old 11-16-2011, 07:49 PM
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1978 CJ7 
Join Date: May 2008
Location: Southwest
Posts: 118
T5 swap

How do you know the T5 is any better? Why don't you just fix your 4 speed? It is a better transmission. Jack.
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post #4 of 4 Old 11-16-2011, 08:20 PM
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Location: Mobile
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If your shifter handle is straight, you have a T176 and would need to fix it or find another. If you have a curved handle, it could be a T-4 or an SR4 and both will swap out to the T-5 with no additional parts or mods. I would only go with the T-5 IF you axle gearing is correct for the tire size. If you running large tires with factory gears, then the extra stress on the transmission would be too much in the long run. If matched correctly, the T-5 can be a good choice. I have been running them for twenty years in some of my CJs. The 5th gear may or may not be a gas saving deal. Once again, gearing for the tire size. I got better MPH with a 4 speed (1to1 4th) with 272 and stock tires than with a 5 speed pulling too low of rpm for the load in 5th. With lower gears and the right sized tire, the first and second gears are lower and the over drive is just right for the higher interstate needs to match.

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