just to add to the question.....but first, depends on what the shop would cost to rebuild it, assuming it needs to be rebuilt. then you can look at prices for another t-45, a t-5 would also work, but either of those are weaker than either a used 3550 or 3650. depending on the price of a used unit in low miles, then you can make a decision. if I am not mistaken, the 3550 and 3650 usually have 11" clutches with them and yours (unless already upgraded you can use an 11" clutch with the trans you have...that is what I did in mine, you just have to have an 11" flywheel and clutch to do it), is a 10.5". things you will have to check.