4+3 to ZF6?
Thread Starter
Drifting
Joined: Jun 2007
Posts: 1,454
Likes: 15
From: Martinsburg WV
4+3 to ZF6?
My car is an '88 C4 with the 4+3. Whats needed to swap to a ZF6 transmission?
Did a search but couldnt figure out what kinda flywheel to use?
Will all the 4+3 parts work?
Read something about the flywheels being different thicknesses so what has to be done or used to make this work?
Did a search but couldnt figure out what kinda flywheel to use?
Will all the 4+3 parts work?
Read something about the flywheels being different thicknesses so what has to be done or used to make this work?
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
My car is an '88 C4 with the 4+3. Whats needed to swap to a ZF6 transmission?
Did a search but couldnt figure out what kinda flywheel to use?
Will all the 4+3 parts work?
Read something about the flywheels being different thicknesses so what has to be done or used to make this work?
Did a search but couldnt figure out what kinda flywheel to use?
Will all the 4+3 parts work?
Read something about the flywheels being different thicknesses so what has to be done or used to make this work?
The 4+3 flywheel is about 3/8" thinner than the ZF6 flywheel.
The ZF6 replacement single-mass flywheels are the same thickness.
Some theories are out there that when swapping to the 4+3 single mass flywheel, the fork angle could cause problems. Centralcoaster performed this swap using the 4+3 flywheel, and the stock ZF6 stud without an issue.
I mocked mine up, and I agree that the stock stud might be a hair too short. It seems as it if compresses the clutches slave cylinder way too much, and as the clutch wears can cause some problems.
Then again, the suggested ZR1 stud adds 5/16" which puts the fork
pretty far away from the slave cyl rod, and only gives you about 5/8" of working area. It also could cause a clearance issue with the pressure plate, although it appears as long as the travel doesn't exceed 5/8" it should be fine. I'm told slave cyl travel is roughly 13MM (or 1/2").
In MY opinion, I think what I will end up with is the ZR1 stud, and then adding a coupling to the slave cylinder rod to get the travel within the normal operating range. I just need someone to measure the compressed distance of the rod in a STOCK OEM ZF6 setup, so I can get an idea of how much length to add to it.
-- Joe
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Instructor
Joined: Sep 2007
Posts: 249
Likes: 0
From: Abilene Texas
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Instructor
Joined: Sep 2007
Posts: 249
Likes: 0
From: Abilene Texas
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
-- Joe
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Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
us ol' furts have been dealing with the pivot ball height situation since the 6o's when lakewood bellhousings/scattershields, slight different depth from oem, first came on the market...solution: lakewood's adjustable height pivot p/n 15501 ($16.95 from summit)...install the adjustable pivot, bolt on your bellhsg, slip in a temporary ''dummy'' trans input shaft (reqd to keep clutch disc centered, also positions t/o bearing) and you can SEE the clutch fork move and adjust the pivot height accordingly.
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
us ol' furts have been dealing with the pivot ball height situation since the 6o's when lakewood bellhousings/scattershields, slight different depth from oem, first came on the market...solution: lakewood's adjustable height pivot p/n 15501 ($16.95 from summit)...install the adjustable pivot, bolt on your bellhsg, slip in a temporary ''dummy'' trans input shaft (reqd to keep clutch disc centered, also positions t/o bearing) and you can SEE the clutch fork move and adjust the pivot height accordingly.
-- Joe
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
will NOT screw into the zf bell, will need to adapt it...don't have one ''loose'' here right now for heights but there is ''much'' adjustment available, suggest call direct to lakewood (very helpful in past)