i think you will be happy with the t5 once you get it set up, mine is from an 88 iroc with the mechanical speedo(v8 world class) yours being from a v6 should work good with the 3800 depending on rear gear ratio,i run a 3.42 rear gear on 25.6 inch tall tires(p265 50 r15 8 inch vette rims)motor is 355 with etec 170 heads, hydraulic roller cam, rpm air gap intake,650 cfm edelbock carb(i have an 800 cfm as well wich wakes it up quite a bit!) 650 is for cruising and a bit of fuel economy.i would say that first is a bit short in my combo but not bad just peppier than a four speed,gets out of the hole quick for a light car on the streetand having that 5th gear is the best of both worlds gives me that good bottom end and i can cruise the highway at 70 to 75 mph around 2100 rpm all day! if you are worried about strength in the trans there is a company in florida called
http://www.5speeds.com that makes a billit plate to support 5th gear that is supposed to help the trans a lot, mine is stock and ive had no problems so far and i do beat on it pretty good by times(estimated 435 hp 435 torque)i dont remember if you are going fuel injected or carbed or using a computer but isnt the camaro(95 to 2002) the 3800 as well?if going fuel you might be able to use the engine and trans harness to hook everything up imnot shure on that, anyway for the speedo you could get an aftermarket electronic one i believe that will work with your trans instead of trying to change out the tail end and as far as the reverse lights go there is a plug on the left side of the main case(kinda oval with two pins in it) you can get the two wire connector for it from a 95 on up v6 camaro or firebird and just extend your wires from the car down to it(was a very simple two wire hook up on mine) my trans crossmember i used was originally set up on a th350 and then we made the angle on it for the t5. overall id say it was a pretty easy swap(mostly bolt in)you will have to get a drive shaft made using the yoke for the t5 (yoke is shorter than a th 350 in the splines and a different count) and the driveshaft is overall shorter as well. ONE THING TO WATCH OUT FOR IS make shure when you measure for the driveshaft your car is setting at the proper ride height after the trans and everything else is installed and if you are using adjustable rear arms get the rear diff where you want it first, as i mentioned the spline engagement on the t5 yoke is short (about three inches overall if i remember right) so you will want to make shure you have the right engagement to allow for suspension movement and not drop the driveshaft out or have vibration problems from not enough engagement. too far in will damage the trans as well. i would say the t5 was the best change i made to the car without spending the money for a tko 500 or 600 and having to chop up the tunnell to get it in.
p.s. as far as the reverse wires having anything to do with the neutral saftey in the puter i have no idea on that.
73 astre gt 355 small block 435 hp 435 torque edelbrock performer rpm power package