They're Baaaaaack.... Transmission ghosts - TCCoA Forums
 
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post #1 of 5 (permalink) Old 07-30-2016, 04:25 PM Thread Starter
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They're Baaaaaack.... Transmission ghosts

Well I got my '95 Tbird 4.6 back from the shop Thursday evening.
Went in for a whining transmission, won't sift from 1 to 2 at wot, and for a B&M Shift kit... I KNOW THE JMOD. NEXT TIME. OK??
So, mechanic said there was some trash in filer, but didn't seem concerned beyond that. Shift kit in and working fine. No whining.
Trans shifts hard and quick. Still wouldn't shift at wot. So I replaced the TPS and fixed that. But whining is back when warm under hard acceleration. Pretty sure it's the torque converter.
SO HERE IS WHERE I NEED HELP. The car is a toy, but not a race car. I want it to launch a bit quicker, accelerate a little faster. It's has 3.08 gears now. 89,000 original miles and engine is bone stock with 180 degree thermostat with fan control. Air box modified by removing air horn, K&N filter. Use the car for some mild playing on the curves and a quick take off every now and then 4500 max rpm.
Plan is to add a 2400 stall FTI street brawler torque converter. The B&M plate type transmission cooler is here waiting to go in as well.
The rear end plan is to install a Auburn 3.55 rear gear to quicken up the acceleration a bit.
I'm hoping these changes will be noticeable and still leave the car drivable.

Mr.Thunderbird

Last edited by Mr.Thunderbird; 07-30-2016 at 04:35 PM.
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post #2 of 5 (permalink) Old 07-30-2016, 05:48 PM
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post #3 of 5 (permalink) Old 07-30-2016, 06:08 PM
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Quote:
Originally Posted by Mr.Thunderbird View Post
Well I got my '95 Tbird 4.6 back from the shop Thursday evening.
Went in for a whining transmission, won't sift from 1 to 2 at wot, and for a B&M Shift kit... I KNOW THE JMOD. NEXT TIME. OK??
So, mechanic said there was some trash in filer, but didn't seem concerned beyond that. Shift kit in and working fine. No whining.
Trans shifts hard and quick. Still wouldn't shift at wot. So I replaced the TPS and fixed that. But whining is back when warm under hard acceleration. Pretty sure it's the torque converter.


SO HERE IS WHERE I NEED HELP. The car is a toy, but not a race car. I want it to launch a bit quicker, accelerate a little faster. It's has 3.08 gears now. 89,000 original miles and engine is bone stock with 180 degree thermostat with fan control. Air box modified by removing air horn, K&N filter. Use the car for some mild playing on the curves and a quick take off every now and then 4500 max rpm.
Plan is to add a 2400 stall FTI street brawler torque converter. The B&M plate type transmission cooler is here waiting to go in as well.
The rear end plan is to install a Auburn 3.55 rear gear to quicken up the acceleration a bit.
I'm hoping these changes will be noticeable and still leave the car drivable.
You really don't want it shifting at WOT. Ideally it should say in 3rd. WOT pulls in 4th, AKA Overdrive are not good for the trans ... at least on these cars that are putting down some serious HP. It's been so long since I've driven a MN12 with a relatively stock transmission I can't even remember if they're SUPPOSED to shift at WOT?

Yes, the changes you outlined will make the car more peppy and it will still be drivable.

After a quick search the general consensus appears to be that FTI makes good converters.

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Last edited by Trunk Monkey; 07-30-2016 at 09:46 PM.
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post #4 of 5 (permalink) Old 08-01-2016, 08:58 AM Thread Starter
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Man, Thanks a lot. I was wondering about those converters. There not the dirt cheapo type but not the high dollar full race stuff I can't afford. My repair shop is doing good work at reasonable prices so the changes I laid out will be done this year.

Mr.Thunderbird
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post #5 of 5 (permalink) Old 08-01-2016, 09:27 AM
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Yes, the transmission on a stocker shifts at WOT. The car would not have been very successful if every spirited drive was met with a rev limiter in your face until you let off!

And with 3.08 gears, any WOT below 90 MPH would be addressed with at least one downshift to 3rd, if not to 2nd also.

Al

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