I have a 1990 Iroc and It has an automatic transmission. My Uncle has a 5 speed transmission that he thinks came from a 1984 Berlinetta with a digital dash with all the bells and whistles, and electric speedometer. I dont know if it was a V-8 or a V-6. I am wondering if my electric speedometer will work with this older transmission, and if there is any special things I may have to change because of the earlier year in the tranny. Any info would be useful. Thanks...

 

The only differences would be the older T5's would be NWC (non world class), the electronic or analog speedo could be ran with a simple change of the plug on the tailshaft.

 

If that T5 came from an 84 Berlinetta than it was a V6 tranny. The 84-85-86 Berlinetta wasn't offered with a 5-speed and a V8 from the factory during the 'digital' Years.

 

Thanks for the Info. If I remember right the bell housing is different, and I dont know if the V-6 tranny is different in any other ways, like is it weaker or did they just change the bell housing and use it on the smaller engines?

 

its the same tranny as the v8 just diff bell housing but i was also thinking all the berlinetta's came with the v8. I think that becuase it was the only version without g/f with v8 i think im not sure tho. anyway its the same trans just get a v8 bellhousing mose will work.

 

Overdrive (5th gear) ratios differed as well, regardless of it being WC or NWC. The HO and TPI cars used a .73 5th gear, and the others used a .63 5th gear.

 

input is differant, so are the gear ratios 1,2,3 and 5

 

regardless of diff gear ratios its still the same trans hell lower gear ratio isnt a bad thing. The Trans is the same strength and will use the same driveshaft torque arm electric hookups v-8 bellhousing clutch ect... so he can use it for a v-8 its the same T-5 just diff ratios as long as it bolts up he can use it.

 

a NWC trans is not nearly as strong as a WC, and the V6 cases are weaker than the V8 cases. The gearing is different, the input shaft is different(and will not be interchangable from a WC to NWC) the case/gears/syncros/shafts are weaker.......and you'll have to change the speedo stuff over from one trans to the other.

NWC = Non World Class
WC = World Class

 

we know what a nwc and wc is and the guys question wasnt wether or not it was weaker or had diff gears or anything like that it was will it work and the fact is it will work. As for it being weaker i dont think it is anyweaker why would gm bother making 2 diff T-5's the wc came becuase it needed to be stronger. Another thing it could be from a v-8 berlinetta's was v-8s that i know i think they all was or it was just a sc. None the less it will work hes going from a auto to a stick hes going to have to change somethings anyway who cares about the speedo

 

well when it won't fit you can help him out. the v6 input shaft is longer. it is rated for less tq and hp. (look it up befor you spew information you know nothing about) and yes the gear ratios will hurt so it is a bad thing... if you want more gear get a ring and pinion. you want closer ratios in your trans

if you would like to let him know these things befor he gets half way into the swap.

there are many people who have done the swap and I can tell you it's not something that just drops right in there are little details you left out.

(there are some posts that let you know how much needs to be cut off the input shaft for it to work)


case, output shaft, tail housing, shift forks , cover and shifter. are the same but, the gears are differant.



now for the main question...... yes it will work but, there are little details that need to be addressed

 

I apologize, but the font was too small for me to read, maybe you could make it a little bigger next time.

 

88 he wanted to know if it would work it will work the boy should know hes going to have to do some stuff for crying out loud good lord you gotta do **** when you go from auto to stick.

 

Have you ever seen the input gear on a V-6 trans with 3.27 1st gear?
A V-8 would spit that thing out like popcorn.

 

The V6 trans input is also 16 spline, not 26, so you have to use a V6 clutch disk. The input is longer, but just in the pilot bearing length, so it can be trimmed off. Yes, he will break it very quickly.
...GM didn't build T5's, borg warner did. And there were MANY versions.... Several have an extra brace in the case, which was usually the V8 versions. Believe me, I've split 3 cases into several pieces....(usually somewhere around 6000 in 3rd gear...)

 

Only takes about 2 hours to take em out and put em back in.

Get the tranny and blow the thing up , then go buy a World Class Unit.

 

Running a V6 clutch disc and trimming the input shaft isn't a big deal to me if that's all that's stopping me from using the abundance of V6 T5s.

Anyone know if the 4th gen WC T5s require the same mods to work. Also, since the search feature is down, can anyone point me to the thread that specifies the mods necessary? Thanks in advance.