t5 to auto?

Im new to this so please dont crush me, I have a stock 83 5.0 ho with the t5 its broken I have a chance to put at5 from a tbird supercoupe in it but was told it will not fit?. I was also toying with going to a auto for the consistency on the strip but dont know what will fit or witch platform to get it form. can i use a p-glide on the 1/8 mile for better times. any help is better than no help thanks.:(:shrug:
 
I would go with a built AOD if you want an auto. wouldnt it be just as expensive to swap a c4 as a powerglide? to me its a moot point it just boils down to what you are used to working on:shrug:

if its a strip car I would just skip a t5 altogether and get something in the tremec family. T5's dont hold up too long after being powershifted down the track.
 
A C4 will be a tad smaller and lighter than an AOD, if you are strictly making a track car and can be rebuilt with common garage tools. Find a C4 out of a truck if you are going junk yard shopping.

If you choose to go the AOD route with electronic OD and a manual valve body, expect to pay more in the long run, but with the added benefit of being able to cruise the highway at a lower rpm.

My suggestion is to do it right, put a properly built tranny on the CC if you don't have the funds and do it ONCE and make payments to pay it off as quickly as possible.

I can also vouch that even doing it myself, most T5's cost 500+ to repair just in parts as the broken teeth also chew up the counter shaft. You could go the Astro Performance route but then you still have a weaker case, which Astro has some bracing for that as well, but if you have to pay someone to install the kit, it becomes rather pricey really quickly.