Circle track tranny problems - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 7 Old 05-25-2009, 02:07 PM Thread Starter
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Circle track tranny problems

Ok, asking this question about my cousins cirlce track car so bear with me. Car specs:

2.3L punched to a 2.5
6.66 9" rear
Turning 8500-9000 rpm at race speed
2155# car
Modified four racing class
Four speed tranny from a mustang, 81 or 82 vintage, aluminum case, etc. Third gear is 1.66, fourth is 1.00.

Having trouble with burning up transmissions. Using standard MTL in it. Tranny has burnt up twice now. Output shaft is really heating up. Had been using pinto tranny until now, but swapped due to lower third gear.

Any ideas?

1. Is tranny lube correct or should it be ATF?
2. Should there be a break in period and if so how?
3. Too much rpm?
4. Kinda flying blind, feel free to ask any questions and I'll find the answer.


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Last edited by 93Cobra#2771; 05-25-2009 at 02:49 PM.
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post #2 of 7 Old 05-25-2009, 03:13 PM
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It's possible that the tranny lube is being pulled away from the tail shaft by cornering forces (G Force). Try putting more fluid in the trans then normal and see if that works.


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post #3 of 7 Old 05-26-2009, 08:39 PM
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Quote:
Originally Posted by 93Cobra#2771 View Post
Four speed tranny from a mustang, 81 or 82 vintage, aluminum case, etc.
I could be wrong, so double (triple) check this, but didn't those older trannies use gear lube? I thought the switch to ATF came with the T5. In '81, '82 I thought they were still using the SROD(?). Like I said, my memory is foggy, but this is something half way credible to check out.
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post #4 of 7 Old 05-27-2009, 12:26 PM
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Quote:
Originally Posted by Dave_B View Post
I could be wrong, so double (triple) check this, but didn't those older trannies use gear lube? I thought the switch to ATF came with the T5. In '81, '82 I thought they were still using the SROD(?). Like I said, my memory is foggy, but this is something half way credible to check out.
That sounds about right.

Can you replace the craptastic SROD with a T5? Plenty of them out there and if a stock one isn't up to the task, there are plenty of outfits out there hot-rodding T5's...

If not, (I'm thinking class rules don't allow T5's,) make sure you're running the correct lubricant, and run synthetic if possible.

Since the output shaft is having issues, I'd try running an external oil cooler for the tranny fluid (similar to running a diff cooler,) and set up the return line so that it sprays the cooled fluid against the output shaft.

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post #5 of 7 Old 05-27-2009, 07:07 PM
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Wow, someone else actually has one of those transmissions!

Basically looks like t5 w/o the 5th gear bump in the tailhousing?

Called my buddy and we both seem to think it was ATF in there....BUT, he looked it up in the manual and it specifies... Ford PN esw-m2c83-c fluid which seems to be an 80 wieght fluid... so it looks like it should be gear oil...

That's a 79-82 turbo 2.3 trans designated a RAD trans.....

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post #6 of 7 Old 05-29-2009, 01:52 PM Thread Starter
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Update: I now have a part number off the tranny. And he has 3 of the trannies.

RAD Y E 2 (
D9ZR EA 126270

Also, he has gotten into the tranny further. It appears that the synchronizers literally beat each other to death. They even mauled the synchronizer stops. Lots of brass all thoughout the tranny. They are thinking perhaps a high speed vibration (that he felt during the run) possibly caused the failure. Pinion angle is infinitely adjustable and they are guessing perhaps the angle got too much coming out of the corners. Or, the fact that he got hit in the rear pretty solidly might have done it all at once.

Quote:
If not, (I'm thinking class rules don't allow T5's,) make sure you're running the correct lubricant, and run synthetic if possible.
Have already mentioned this to him. Unlimited choice on transmissions, but cost/weight is obviously a factor.

Quote:
It's possible that the tranny lube is being pulled away from the tail shaft by cornering forces (G Force). Try putting more fluid in the trans then normal and see if that works.
I mentioned that as well.

Will keep all updated. I have yet to actually even see the tranny, I'm kind of curious to see it now.

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post #7 of 7 Old 06-01-2009, 10:27 PM
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A hit in the rear would definately tear it the f up...

I had a nasty hit in my teen years with my first stang and knocked the k-member back enough to jam the driveshaft into the trans and destoy everything.


As for the trans selection, a t5 will bolt right in. Using the same bellhousing and clutch.

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