Supra swap

Sorry, I keep thinking of reasons I decided to go with the R154. :)

I didn't like the gear ratio's of the T5, 5th was too tall with the short first gear, just didn't make a good combination. On the other hand, the R154 was almost identical to the TKO 1st through 4th with a better 5th gear to match the shorter first.

From what I could tell, no matter what I did I was going to have to cut the crossmember unless I went to the Keisler kit. Even the T5 would require a cut to get the tail up into the car for a correct driveshaft angle. If I have to cut the car anyway, what's the advantage to the smaller T5?

BTW, found my notes, here's a couple of pieces of intresting info.

TQ rating for the R154, T5, 3550, T56
450, 330, 425, 450

Weight for the R154, T5, 3550, T56
94, 76, 95, 135

Similar rating for between the R154 and the T56, but the R154 is 40 pounds lighter.

Something else, the T56 is rated at 450 ft/lbs with a 2.66 1st gear. Aftermarket T56's with a 3.36 first gear similar to the R154 have a 360 ft/lb torque rating. It makes sense to run a 2.66 first gear with a deep rear gear since you have a double overdrive, but it's one more cost to add to the equation. I can run a 3.23 or 3.55 with a 3.25 first gear, but the 2.66 would need a 4.10 gear or so which would cost more than a 3.23 gear.

In the end, the pluses and minuses landed me on the side of the R154. Would have been there sooner if I was building a V8 as I wouldn't have had to adapt anything. :toothy10: