[nguthrie8104]

I drive an 01 bullitt and i have 3.73 gears and i got an offer to trade my 3650 tranny for a t45 tranny from a 99 gt. I know the t45 tranny is alot shorter than the 3650 when it comes to gear ratio and I was thinkin it might help improve my 1/8 mile time by alot. they put the t45 in the 96 - 00 mustang gt with 2.73 gears and i know those transmissions are short as hell. I have run a 9.064 et at 79.14 mph with a 2.121 60' time. I figure the t45 would give me a good bit better track time.

[rj8806]

Not sure where you got your information from but the T45 and the Tr-3650 are almost identical in gearing and the T45 was in the 1996- mid '01 GT's with 3.27 rear gears, not 2.73's.

The T45 gears are as follows:
1st.. 3.37
2nd..1.99
3rd..1.33
4th..1:1
5th...67

The Tr-3650 was:
1st..3.37 (some had a 3.38)
2nd..2.00
3rd..1.31
4th.. 1:1
5th...67 (some had a .62)

So as you can see, they are almost identical. As far as the T45 helping your 1/4 mile times, it isn't.

They T45 is a direct replacement for the 3650 so bolting it up will be no problems at all.



Richard
Tech Support
Tremec TKO, T45 & T56 Transmission Systems

[cfkboyz]

It was my understanding that the TR-3650 had been built to get rid of the short comings of the TR-45. And in mid 2001 that is why they switched to the tr-3650.

[ITLRUN]

From 00 - 04 the GT, came through with the Tremec 3650 not the T-45. You want to improve your track time, swap out the 3.73 gears for a set of 4.10 gears. And with a good set of tires, with the right pressure you'll also improve your short time. That 2.12 short time, is what's killing your track time. You need to improve on that, like a 1.60 at least and it can be done if you launch at the right RPM, Mike. SCT Tuner. With the 70 BOSS, and 10.5" tire 1.24 60 foot time, 96 SVT Cobra, with same tire and 4.10 gear and many mods 1.52 short time at best. The Boss 429 SCJ F-2 Pro Charged, and 4.30 gears with Currie 9" and 35 spline axles with Viper 6 speed for fuel economy ha,
Mike.

[Bullitt5339]

Why would you go from Bad to Worse?

[BlueStreak03]

Originally Posted by Bullitt5339

Why would you go from Bad to Worse?

The only T-45 I would even consider is one that Keisler has gotten their grubby grubbies into.

[rj8806]

Originally Posted by ITLRUN

From 00 - 04 the GT, came through with the Tremec 3650 not the T-45. ...

Nobody said otherwise. What I did say was the T45 was in the GT's until early to mid -'01.

cfkboyz..... Yes, the idea behind the Tr-3650 was do "fix the issues" that the T45 had. The only problem with that theory is they didn't do such a good job. The T45 and the Tr-3650 are 2 totally different types of 5 speeds. About the only thing they have in common is that they are both 5 speeds.

The T45 is what they call a single rail linkage system where the 3650 is a multi-rail. The single rail systems (like the T5 and the T56 6 speeds) are known for there smooth shifting capabilities while the multi rail linkage systems(like the TKO's) are notchy.

If you ask any one who has worked on both, if they answer honestly, they will say the 3650 is not as good as the T45. The only issue with the T45 that was a PITA was the "jump out of reverse" syndrome that most experienced. Fortunately, we at Keisler Engineering, have come up with a fix for that along with a laundy list of other mods we do to it to make it even better and stronger than the 3650. I have been running one of our very first T45RS's in my '00GT for almost 2 years now and it is flawless. It has a 26 spline input (unlike the inherently weak 10 splines that came stock on all factory Ford tranny's) which makes it stronger along with carbon fiber syncros and blockers, brass fork pads and "tricked out clutch cones" make our version T45RS capable of handling 425ft/lbs continuous where the stock T45's were rated at 325ft/lbs and the 3650's were rated at 360ft/lbs.




Richard
Tech Support
Tremec TKO, T45 & T56 Transmission Systems

[2Manystangs]

I'd recommend some serious work on your rear end suspension it is holding you back, I'd try to find someone at Steeda or similar to sell you a drag launch kit...