Pretty sure I already know the answer is yes that it's bad, however I'm unfamiliar with these transmissions and just want to be sure I'm going into the deal right. I already have another T5 sourced.

The car is a 1987 Iroc-Z 305tpi.
Car itself is gorgeous and the motor runs great.

However at idle, there is a constant 'clicking' noise. If you push in the clutch, the noise goes away.

It goes into and out of all gears fine.
All gears sound normal except 3rd. As soon as you hit third its just a ton of very loud knocking/tapping noise which goes away as soon as you get out of third. It still drives fine in third and goes in and out of third fine.

Either way I'm probably going to buy the car if he works with me on price a bit.

Just wanting to maybe know specifics on what it could be in the trans assuming that's the problem.

my 89 trans am is doing the same thing, sounds like a crap box in 3rd and 4th is horid! Car shakes and pulsates. I'm thinking of a new t5 or maybe a conversion.

i got my rebuilt WC t5 from Man-Trans $600 plus 200 shipping. delivery to your door. if you want their information let me know

Just curious, what color is the car?

it's black, heres a pic



Anyway i actually already have a t5 sourced, its used but its from a friend's brother who went auto. Hopefully I'll get it for just like $100.

Going to try to pick up the car tonight for the 1500-1700 area

My T56 makes a horrendous racket in neutral sometimes.... Has run fine for years with a 350 in front of it making a good amount of torque.

yeah my first 99 z28 t56 made a lot of noise in neutral and while cruising in 6th, i think its trans mount was bad though and it was just vibrations.

my 99 formula was quiet until I put the cam in it, it made the shifter rattle pretty bad heh.

I would bet there is a tooth or teeth missing on either the 3rd gear itself or the cluster gear has a tooth or teeth missing for 3rd. My son just ripped ALL the teeth off of his, but he has 500+ Hp to do that with. Myself, I have hurt those tranny's even with my stock 305TPI motor. 3rd is the weak link in the T-5's and the case can and does flex if your running any kind of power at all to them. My son just finished, with my help, the TK0600RR conversion and likes it real well so far - it's still in the breakin period tho so I don't know how the shifts will be at 6800. My two cents, hope you can pick that one up for 100.00, thats a good deal if its good.

3rd is what normally breaks on a T5 if you miss it hard..


-- Joe

Or if you hit it at 7000 with 510HP - bad things happen!

I hit it at 6200 with 560hp and never broke it, but I guess 7000 is a different story.

-- Joe

Ya know, it really is about the torque that we are putting into these cheap little boxes. Horsepower really doesn't break them, but torque is very hard on them. We are at about 485 ft/lbs on a 300 rated trans, so even at 6200, sometime, somewhere, when you least expect it ............. and we knew that when I was putting it all together for my son. That "cheap little box" held up for about 8 months. All was good in the beginning, then the bearings started to "talk" a little, then a little more, then after I retimed the motor because my son said it wasn't running quite right after a cam replacement (same cam) he went from 2nd at 7000 to BOOM just as soon as it went into what used to be 3rd. We went with a TKO600RR just in the last couple of weeks and it is working very good right now, but we are still in the break-in miles, so I won't say too much until we can bang that thing like a screen door at 7000. I will let ya know how that goes.

Would love the info I want a brand new trans.