T-45 Tranny Fluid: Syncromesh vs ATF? - MustangForums.com


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Old 08-13-2015, 09:33 PM   #1  
Greyshot
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Default T-45 Tranny Fluid: Syncromesh vs ATF?

I wanna here some opinions on which transmission fluid people use in the T-45 transmissions. I have a T-45 in my '00 gt and am currently using ATF in my car. Before I had put in the ATF i was really contemplating using Penzoils Syncromesh. I read a lot of good reviews on it when using it in the T-45 and even in the T-56s. People were saying these trannys were shifting like butter and even got rid of the annoying reverse gear grind.
On the other hand I had read that the syncromesh will end up deteriorating the paper sycros that are in the t-45. This is what made me get the ATF instead.
So has anyone had any experience with Penzoil Syncromesh in these transmissions? I would really like to get some insight from people that have used it first hand because Im really thinking of using it for my next tranny fluid change.
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Old 08-14-2015, 09:41 PM   #2  
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Old 08-15-2015, 03:32 AM   #3  
dawson1112
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Synthetic atf is all I ever used. I wouldn't waste my money on synchromesh, that usually one of those things that pple use to try and fix an annoying grind due to worn synchros. If they are worn they need replaced, nothing else will make it shift smoother. Most of the time the reverse grind is caused by a problem with the shift fork, either the pads are broken/missing or the shift fork cracks. This usually starts to effect 5th gear as well the worse it gets. My last t-45 I rebuilt had a problem with 1-2 shifts, and grinding going into 5th and popping out of reverse. The 1-2 problem was simply worn syncros and slider, but the reverse 5th problem was that the pads on the shift fork were broken/worn off.

My advise is that if your trans if currently not experiencing any shifting problems then just use the factory recommended atf. If you having any kind of issues with grinding or popping out of gear , get it rebuilt.
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