TF 727 problems

trailjeepman

trailjeepman

Well-Known Member
Joined
Jun 7, 2005
Location
Raleigh, NC
I just replaced a T5 with a TF727 in my 83 CJ7 inline 6. I am having problems with it over heating and then slipping bad.(within 10 minutes of driving) One thing I noticed is that the fluid does not pump at a very high pressure. This transmission was supposedly recently rebuilt. Hope someone can help me!
 
Who 'rebuilt' it. Any paperwork/reciepts etc.. define high pressure ? If its the cooler lines, no they are low pressure. Unless you measuring a pressure port somewhere you wont see the actual pump pressure inside...

What size cooler do you have ? Is it circulating enough ?
 
Does it shift properly when cool or just slip? Do you have the pressure valve adjusted properly and are all the checkballs accounted for? Did you check the band adjusters to see if they were adjusted correctly? And how are you measuring the pump pressure?
 
To yager: I dont know who actually rebuilt it but I bought it from someone in the club. I had to drain some fluid from it because it was too full, so I took the outgoing line loose and let it pump into a bottle. Seemed as if it was just a little more than pouring out. Also like it had some air in it. The cooler should be plenty big, but it is actually a condensor coil off a vending machine compressor unit.(about 18" x8" and three rows of copper line thick. all aluminium)

To Studnuts:When cool, it shifts properly but feels like it does slip a little. Pressure valve? checkballs? I dont know how to check the band adjusters. Pump pressure..see above.

Thanks for responding guys!
 
It may be overheating due to excessive slipping. Try adjusting the front and intermediate bands and see if that helps.

Drain the fluid

Front band:
Drivers side just above shift mechanism, youll see a large adjusting screw with a locknut
remove the jamnut
tighten the adjusting screw to 72 in/lbs
then loosen the screw 2.5 turns
hold the tip of the adjusting screw and bolt down the jamnut 35 ft/lbs

Rear band:
On the pass. side of trans
remove the jamnut
tighten the adjustment screw to 41 in/lbs
then loosen adjustment screw 2 turns
hold the tip of the adjustment screw and tighten jamnut to 35 ft/lbs

Replace the pan and fill fluid. Give that a test drive and see if that helps out any. That should eliminate any slippage and lower operating temps significantly.

And one more question, when the trans overheats, is the cooler hot to the touch?
 
Do you have your throttle valve hooked up? A loose or improperly adjusted TV will cause all of your symptoms.

Also on the pressure issue... you do know that Torque Flights do not pump in park, don't you. When you took the line loose and not much fluid came out, was the tranny in Park or another gear?

I have been through many TF trannies and will be more than happy to help...
 
I checked the pressure again with it in drive and it had a little more pressure. Probably would fill a quart in about 2 minutes. Can you give me some instructions on the throttle valve? I had to rig my own design since the linkage did not come with the tranny. I may have it too tight.
 
The throttle valve must be spring loaded towards the front of the tranny at rest. You can fab up a bracket that attaches to a bellhousing bolt if needed. Then run a spring to the throttle valve lever, pulling it towards the bellhousing.

You still need a TV cable kit to allow proper shifting. I got mine from Lokar and it works great. You want just a little (1/8") of slack in the cable at the carb/throttle body w/ the throttle closed. Then as you apply throttle it will pull the throttle valve lever and give proper pressures...
 
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