first question: bolt sizes for pressure plate bolts
second: i have a t5 from an 84 z28, advanced auto states that if that trans came from a one piece rear main engine it will not work with a two piece rear main engine??? something about the input shaft beeing longer on a two piece?? i have no idea i figured it bolt right up.
third:will a shift fork from a v6 bellhousing work with a v8?

 

First: Try a 3/8-16 bolt. Off the shelf "pressure plate" bolt packs from Motormite or ARP are probably easy to find for this app.

Second: All that needs changed is the flywheel. An 86 T5 bolts right into an 85 and vice versa. The balance of the flywheel and the bolt pattern of the crank do not impact the trans. My first T5 was from an 84 TA and I used an 86-up flywheel on an 86 engine with it.

Third: I'm allergic to V6s but I think so if they're both 84-92 hydraulic forks with 84-92 hydraulic bellhousings

 

The trans should bolt right up, you just need the correct fly wheel/pressure plate for your motor application.

I just purchased a fork for my transmission from the chevy dealer a year ago, and it's got V8 stamped in it. Can't say if the V6 will work properly.

 

Well, let's put the BH situation this way...

I have a 83 car. Came with a linkage clutch. I HATED it, for the same reason I had hated the clutch linkages in the 4-speed cars I'd had for the decades before. The INSTANT I found a hydraulic setup in the boneyard, I ganked it and swapped over; would have been in around 86. Seems like it was out of a wrecked 84.

At some later point, mabye 87 or 88, I swapped a 400 into the car. Used the same 84 BH, got another stock 305 flywheel and had it "unbalanced" at the balance shop to the stock 400 spec.

After destroying no telling how many T-5s, the 2nd design ones that everybody calls W .... Wo ...... Worl . {puke} sorry, just can't say it .... anyway, those .... started becoming available. I quit using 1st design cores and started using 2nd design. So, over the years, I had several of the later transmissions bolted up to the 84 BH behind about a 73 400.

At some point I got the ENTIRE setup out of a 91 1LE car, and put that in the car, because the BH was nice and clean and shinier than mine. So by that time I had a 400, the 83 flywheel, and a 91 trans & BH.

A couple of times, the clutch hydraulics failed (once the headers melted the line, and once the line just .... popped). Each time I went to the dealer and got a new set. The first time I asked for the set for a 84. It was out of stock, so I asked for a 85, then a 86, then a 87, etc. until I found one that was IN stock. Seems like the ONLY one they had on hand was the one for what would have been a new car at the time, which would have been around 88 or 89. Bolted right into my 400/84/whatever T-5 it was ATM just like it was meant to be there. I have no clue what could possibly be different, different enough in fact that GM maintained different part #s for them. Someday I'd like to find out.

Same thing happened in about 97 or so, probably just from age and mileage; don't recall what year the hyd system I ended up was listed for, but whatever it was, it just sucked itself right up into the car and was perfectly at home.

At no time was there a fitment problem of any kind.

I have a whole shelf full of worthless trashed T-5 cores. I could even take pictures to show how identical they are, and what the ACTUAL detail differences are (none of which affect fitment). A few of my pics of such things have been saved by others and are frequently posted on this board.

Bottom line, I have not the vaguest clue where Advance is coming up with that; the only part in the whole system that's different between a 2-pc motor and a 1-pc, is the flywheel. EVERY other piece - clutch, disc, BH, throwout, trans, hydraulics, fork, pilot bearing - is IDENTICAL IN EVERY WAY, as far as fitting the car.

Incidentally, the car has a T-56 in it now. I hope to NEVER AGAIN touch a T-5.

 

well i appreciate your input, btw the guy at advanced was a manager... i work at firestone and i ordered a flywheel for an 84 seeings how the trans is from 84 so today i plan on bolting up the flywheel and go to lowes and getting some pressure plate bolts and see how everything fits.

 

The V6 clutch fork is different from the V8 fork. It won't fit.

The input shaft length is the same between all V6 T5's and all V8 T5's, but not between V8 and V6 T5's. The V6 input shaft is about 1/4" longer than the V8 input shaft. I learned that the hard way when I put my V6 T5 behind my 350.

As for differences between the years, the only changes were internal to the tranmissions themselves, and whrn the switch was made to hydraulics.

 

Lowe's doesn't carry pressure plate bolts.



They are "special", like starter bolts; they have a section that is designed to act like a dowel pin. DO NOT substitute for them, unless you're just tired of having feet. You can get THE RIGHT THING at any speed shop, Summit or Jeg's, maybe AutoZone or wherever else Mr Gasket is sold, etc.

 

The flywheels, as sofa mentions, are different (a change in bolt circle diameter) between one- and two piece rear main seals. If your 350 is 86+, you need a flywheel for a one-piece; If 85-, you need a flywheel for a two-piece.

JamesC

 

i got a flywheel for an 84 z28, its the 16 lb one, also is there any other special bolts i know about?

 

The flywheel for an 84 will not fit the 350 in your 88 (if the motor is original to the car or is an 86+ motor). Am I missing something?

JamesC

 

Right; if your engine is a 1-pc seal motor, you'll need a FW from a 86-up 305. The 84 one will fit 85-back motors.

The bolts that hold the FW to the crank are also "special". Mr Gasket also provides those on a card for fairly cheep. If you're not in too big of a hurry you could order a bunch of that stuff from Summit.

Also don't forget to put a pilot bearing or bushing in the crank.

 

its a 76 block, 2 piece rear main. and ok thanks i understand now because it would contact the friction disc if the heads on the FW bolts were too big.

 

also does anyone know the PN on the shift fork for a v8?