I HATE IT. how much is a 6 speed tranny and how hard would it be to put on myself? (1988)


Edit:
ok so the reason i hate the 4+3 is because it needs a whole new rebuild all the gears and everything.

so i have two options do a 4+3 rebuild or put a zf6 in the car.

im selling my camaro for 3800 so i have about 4500 to put into the corvette. I need almost all new interior that will cost me about 1 grand. and ill probably need to put around 500-1000$ into the engine(maybe thats just a complete guess out of no where) my question for you is it worth putting the zf6 in there or should i just rebuilt the 4+3.

putting a zf6 is about 2000$ and doing a rebuild probably 1200$

anyone like the zf6 better then the 4+3 or like the 4+3 better then the zf6.

(also ive got a friend with a 5.0 mustang that thinks he is hot ****. is the zf6 faster so i can blow his 5.0 away)

Are you the guy who posted on CF?
I'm the one who told you to come here and ask for Central Coaster.

yeah i am. how is central coster lol.

here comes the thread of the week.

Quote:

I don't know if anyone is quite sure how he is. Mean, nasty disposition etc.

Recently kicked off CF........so don't piss him off.

He's got the best information I have ever seen on the swap you desire.

Agreed... CC is the man with this conversion. He has all the parts listed.

Makes it a one day job because he did the months of leg work to fit it right.

it was a typo can we get back to the point?

Why are you getting rid of the 4+3?

Going to a ZF isn't cheap or easy, compared to making what you have work. I really enjoyed my 4+3 until I destroyed it racing on a dead clutch cylinder. Plus the factory programming on your 88 defaults to overdrive on, which is stupid, and can be undone.

A ZF6 swap will cost you about $1600 with a used trans, $2200 with new.


COMPLETE PARTS LIST FOR 4+3 TO ZF6 CONVERSION:

84-85 Corvettes only:

89-93 black-tag ZF6 & 90-93 ZR1 clutch set or 95-96 blue-tag trans & 95 ZR1 clutch set
Standard Flywheel p/n: 6516 from Kragen/PartsAmerica (reusing original flywheel not recommended)


86-88 Corvettes only:

89-93 black-tag ZF6 & 90-93 clutch set or 95-96 blue-tag trans & 95 clutch set
Reuse stock flywheel or 89-96 ZF6 (dual mass) flywheel


Everyone:

91-96 bellhousing, from salvage yard

89-96 clutch fork and pivot stud, from salvage yard

88-91 starter

89-96 clutch master cylinder

91-96 clutch slave cylinder

91-96 clutch slave hose, from salvage yard

89-96 driveshaft, from salvage yard (or just get the slip yoke and install it on your 85-88 manual driveshaft)

TH400 rear seal, Timken #9449 (optional)

Backup switch connector, a.k.a. horn connector, AcDelco # PT1357 or Napa # ECHEC11

(5) metric M12 x 45mm transmission bolts, McMaster.com # 92820A650

(6) standard 3/8" x 1-3/4" pressure plate bolts, McMaster.com # 92316A630

17mm allen driver socket attachment (for fill & drain plugs, available at autozone/kragen in a 3-pack)

12mm allen driver socket attachment (for fork pivot stud)

3 quarts of GM 1052931 or Pennzoil Synchromesh from Autozone

Sheetmetal, rivets and sealant for patching the trans tunnel, and some extra carpet insulation.

Hurst B-4 Shifter Boot p/n 1144580 or OEM 89-96 shifter boot


For dealing with salvage yards..., refer to my part number/application guide and make sure you're getting the right stuff:

CLICK HERE

CorvetteSalvage.com and Vette2vette.com are recommended.


Beware of defective parts!

The ZF6 replacement throwout bearings are Chinese and prone to failure. Inspect the rear flange carefully before purchase for cracks. If it breaks, the car will be undriveable.

CLICK HERE

For awhile, many of the slave cylinders were defective from the factory with a backwards seal. This has since been addressed, but check anyways incase you got an old one:

CLICK HERE
CLICK HERE ALSO


Shifter Upgrade:

I highly recommend installing a Hurst or B&M shifter before installing the ZF6. They are far superior to the stock shifter but are a bitch to install when the trans is in the car.


Gearing and Vehicle Speed Sensor (speedo)

The stock 3.07 ring/pinion makes 6th gear unusable under 85mph. I recommend upgrading to a 3.33,3.45, or 3.55 ratio. This will require changing your speedometer gears.

CLICK HERE

Some background info on the VSS: There are 4 types of VSS's, "large gear" 40-45 teeth, or "small gear" 35-40 teeth, and "early" 84-90, or "late" 91-96. 4+3 owners, just install your old VSS in the ZF6. Automatic owners, you can install your "small gear" VSS upside down in the ZF6 to get proper mesh.


Push-type Clutch Options:

You can retain your "push type" clutch setup with the ZF6 if you convert to a hydraulic throwout bearing. This gives you a superior clutch setup, and more clutch options, but isn't bolt on. Check with forum member LD85 for more info. Hydraulic throwout bearings are made by McLeod, Howe and Ram.


debunking a few myths:

My 85 did not require a longer battery cable (+). The stock one is long enough. I had to tweak the end of the cable to fit the ministarter terminals and rerouted it sideways to the positive battery terminal to get extra reach. Do this when the bellhousing and trans are out of the car.

The longer ZR-1 pivot stud was NOT used. I used the regular pivot stud tightened down all the way. The fork comes close to the rear of the bellhousing with clutch out, you'll need to slide it onto the pivot stud, put the bellhousing in place, then tighten the stud into the bellhousing.[/QUOTE]

I loved the 4+3, if my car was stock, I would have kept it

well i figured out why i hate it. its cause its messed up lol. it was driven without any gear lub for ALONG time. the other day i was at a stop light(there was alot of traffic i was in the front) i had it in neutral and when the light turned green i couldnt get it in 1st lol. the gears would match up and slide in. so i put it and second Reved it up and dumped the clutch lol. i was the only on in that lane that made the green light. whoops sorry guys :D

:sign6: :sign6: :sign6:

Edit bump

I have a good 4-speed section if you're interested.

If either the 4-speed or overdrive need a rebuild, don't bother, it's not cost effective.

If you can't get into gear, it's most likely bad clutch cylinders, but driving on it like this will destroy the trans.

yeah the clutch is messed up also. i need a new clutch and tranny. you think i should just do the zf6 swap? if i do the rebuild ive got to pay someone to do that cause i dont no how to rebuild the gears.

replace clutch and hydraulics = $350
replace 4-speed section of trans = $300

convert to 6-speed = $1800

rebuilding 4-speed = $300-$600


These are ONLY parts costs. Labor for rebuilding the 4-speed will still be cheaper than a ZF conversion, but not by enough to be worthwhile IMO, and then you still have to do the install yourself.

Like I said, I have a spare 4-speed if you want it for $300.

you have a 4+3 for 300$? if it is im interested and maybe later on ill do the zf6 swap

$300 is just the 4-speed section. You have to install your overdrive section onto it. It's pretty easy though once the trans is outta the car.

hey central i pmed you my phone number can you give me a call so we can work everything out.

CC, please swap this for this guy

Quote:

why do you say that.

You need a new tranny

yeah i do but you no you just want me to get this tranny so ill stop talking about the tranny huh. have i dont better on this forums? more descriptive about my problems.

well ive been very descriptive wid my prolems n she still sez nawt tanight i have a headache!!!!!