Hey Guys, I did a search and couldnt find the answers I was looking for , or found 2 different answers. So please dont bash for asking these questions, First of I will start with my car its a 91 Trans am GTA, With a 305 TPI, 5 speed with 3.42 rear end. I blew the transmission and its going to cost over 300 to fix it, So i found a deal on a v6 transmission... So First off I know that the v6 is a 14 sline and the v8 t-5's are a 26 spline on the input shaft, What i was wondering is if you can change the input shaft from the v6 to the one from my v8 transmission thats in my car now?, Another thing I hear that the v6's are to weak to hold up to a v8, also it says that the only differance between them is the smaller clutches on the v6's, So my question with this is that if i put the input shaft from the front of my v8 transmission on the v6 transmisson It should be just ask stong as my v8 transmission right?? Because I would be able to put my old clutch off my v8 on the t-5 out of the v6 right. I know im not the best to write but i hope you understand what i am trying to say, Any help Is greatful Thanks

P.S: one last question i forgot, would the driftshaft out of my car fit right into the transmission out of the v6??

 

No.... the ratios are different, which is accomplished by making the size of the gear and the number of teeth on it different. Won't mesh with the V8 countergear.

Well, you just tore up your V8 one.... how long do you think the EVEN WEENIER one will last?

No they are not really the same strength. The 6-cyl trans has a MUCH deeper 1st gear, meaning that the gear part of the clutch gear (the thing you probably are talking about when you say "input shaft"... a manual trans doesn't have an "input shaft") is MUCH smaller than the V8 one. A smaller-dameter gear means higher loading on the teeth, at any given torque level; same ft-lbs but less ft, = more lbs. Kind of a no-brainer.

Yes they are the same. I know this, because I accidentally got in a hurry one afternoon when I smoked my T-5 for about the hundredth time, and went to the junkyard and bought one off their shelf, and came back home and slapped it right in without looking at it. Put the whole thing in: drive shaft, interior, fluid, and all. Needless to say the car wouldn't even pull off... let out the clutch, and nothing whatsoever happened. Nothing. Didn't even make a noise. I was not happy. That ended up being about 3 hours that I didn't have to spend on it in the first place, down the drain; since I then had to swap my toasted V8 POS back in TOO. 2 trips to the boneyard and 2 trans R&Rs and my trans was STILL fornicated. I was NOT happy.

There's a good reason you "found a deal" on a 6-cylinder trans.... nobody wants it. There's a good reason nobody wants it.... it's a POS. I STRONGLY recommend you not do this to yourself; it might look like a good deal NOW, but it won't look so good when you're having to buy YET ANOTHER one real soon. 1 transmission is cheaper than 2 plus another clutch disc that you'll need in order to hack the little twinkie one in. Sounds complicated I know, but oh well.

What's REALLY wrong with your existing trans?

 

Thank you very much for the info, but one thing im not sure is that you say there is no input shaft, what i mean by imput shaft is number 65 is this picture, that is what i want to know is if you can swap that, Is that what you were talking about i think it is??

p.s: what is wrong with my old transmission is the counter shaft is gone, I put a rebuild kit into it and then went to price a counter shaft and it is over $300 just for that

 

#65 is the clutch gear. At least, that's its "official" name. I can accept no responsibility for whoever printed that other.

No you can't swap it by itself, without also swapping the countergear. The 6-cyl ratios are different. That is accomplished by making the gear part of that smaller, and the 6-cyl countergear larger, than the V8 one. Keep in mind that "ratio" is not only the ratio of the # of teeth, but also the ratio of diameters, and since the distance between the gears is the same, then in order to change the ratio, the one has to be made smaller and the other larger. The V8 one is as large as you can make the gear dimaeter to be, and it still fit into the hole in the front of the case.

The V8 1st gear ratio is 2.95; the 6-cyl one is 4.something. You know as well as I do, you have to short-shift 1st already, as it is, because it winds up out of the engine's power band so quick; that'll do nothing but get worse with the inferior trans in there. You'll hate it.

What's REALLY wrong with your existing trans? Rather than talk about how to kill the alligators, how about, let's not forget that we're here to drain the swamp so we can build a road? Think about what it will ACTUALLY take to fix your current one, rather than this other thing. On top of that, for all you know, if the trans is REALLY torn up and it's not some totally other problem like a clutch, the clutch gear and/or countergear might be what's torn up ANYWAY (that being what usually gets wasted), so swapping it might not be a viable option at all.

 

Alright thanks for the information, To start talking about my transmission then, I know that I need a new counter shaft, I took the transmission apart and put a rebuild kit into it which cost $300, also i replaced my third gear(which was the gear i lost) the transmission was going when i bot the car it poped out of second and reverse, So if i could find a countershaft for a good price it would be good, But looks like they are 300 new

 

Well then you can't swap your bad countergear into the other trans, which means you also can't swap your V8 clutch gear...

If your V8 case was broken, or something like that that's the same between them, then it would be practical to buy a 6-cyl trans and make one good one out of the 2. but you don't have enough good parts to make a good V8 trans.

Cheapest best way out is probably going to be to just be patient and keep looking for a V8 T-5. They're out there. LOTS of them.

 

Yepp they are out there, But really hard to find where i live, I was just talking to a transmission shop and he got a fella goin home to check see if he got a good countershaft for me, Hopefully I will luck out and he will have one,

 

ok i seen this and ive got a v6 t5 and went to put it on my 350, and had the spilnes mixed and i will not put a 9 and 1\8 cluthc on it, so cam u swap the gears from the v6 input to the v8 input and run it like a v6 t5 with a v8 input,or what other trans will bolt in and use the same bellhouseing