• When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.

10" to 11" clutch 440

KL_Mopar_GTX

Active Member
Local time
6:14 PM
Joined
May 19, 2020
Messages
40
Reaction score
27
Location
SW Michigan
hello all. I am working on changing the clutch in my 1970 gtx 4 speed. It has the larger bell housing with the shatter guard. Tore it down to the clutch and realized the one I bought was 11" not 10". Any idea what it would take to change to 11". It seems like I would need a new flywheel which would also require a different starter. I would like to keep the 11" as it is rated for 550 hp. Any suggestions?
 
If you beat on it the bigger clutch will be an advantage.
If not the 10 inch is actually pretty robust unit.
 
It would be an expensive proposition to change from 10-1/2 to 11. Flywheel, disk and pressure plate. If its a scattershield it probably fits both in which case you just move the starter to different bolt holes. Can't you just exchange the clutch ??
 
there is a flywheel bell housing deal here , if your keeping the scatter shield then it works easier . 10 1/2'' clutch uses a 130 t flywhl , 11'' clutch uses a 143 t flywhl . that moves the start out from the crank . these position of start relocation are on scatter shields , but stock bells must be changed to fit there flywhl for start position . and the early 60's factory 413 n 426 max wedge cars used a 130t flywhl with few issues , in fact through 67 440's used 130t flywhls n 10 1/2'' clutch disc . so change or change not . bigger clutches just live longer .
 
hello all. I am working on changing the clutch in my 1970 gtx 4 speed. It has the larger bell housing with the shatter guard. Tore it down to the clutch and realized the one I bought was 11" not 10". Any idea what it would take to change to 11". It seems like I would need a new flywheel which would also require a different starter. I would like to keep the 11" as it is rated for 550 hp. Any suggestions?
You need the appropriate bellhousing and flywheel. The starter can remain.
 
Would an original GTX not have come with an 11" to begin with?
 
There is no 10"\what do you really have
number of teeth
bolt circle or more than one
it's been changed
 
Got my clutch from Brewers, 10.95" Diaphram type and is used with a 10"/ 130 tooth fly wheel 6-hole. Works like a champeen.
 
If you beat on it the bigger clutch will be an advantage.
If not the 10 inch is actually pretty robust unit.
It would be an expensive proposition to change from 10-1/2 to 11. Flywheel, disk and pressure plate. If its a scattershield it probably fits both in which case you just move the starter to different bolt holes. Can't you just exchange the clutch ??
I bought the clutch almost 2 years ago, not understanding what I actually had i know, I know lol...I was looking at flywheels to accept the 11" and I'll probably buy one as it looks like the safety bellhousing will allow me to move the starter without issue. But now I'm stuck on whether I need a internal balanced flywheel or??
 
If you have headers starter fit with 11" could be issue?
Never thought about that issue, thanks. There are no headers on the car now, but I have considered putting them on there. Now I'm wondering if which flywheel I need for the 11" idk it the motor is balanced or not, and there seem to be different flywheels depending on this. Any ideas on that issue?
 
Would an original GTX not have come with an 11" to begin with?
I'm not sure, I bought the car from a guy who's dad had passed away and didn't know anything about it. It was a auto car originally, now it's a 440 6 pack car, looks like someone set it up for racing with the safety bellhousing, body stiffeners, and disc breaks up front added.
 
Flywheels are either neutral or counterweight.
It should be fairly easy to determine what you currently have.
 
Got my clutch from Brewers, 10.95" Diaphram type and is used with a 10"/ 130 tooth fly wheel 6-hole. Works like a champeen.
The clutch I bought is bigger than the flywheel, I think the flywheel is 130 tooth and the clutch is 11" so the bolts that hold the clutch to the flywheel are about 1/2" wider.
 
Flywheels are either neutral or counterweight.
It should be fairly easy to determine what you currently have.
Ok thanks I really didn't look that close to it after I pulled the old clutch and realized the new one was too big. So if the flywheel has a counter weight on it then it's not a internal balanced one right?
 
That is right. A counter weight could look like a lump of material also.
If it is there it will be on the back of the flywheel.
 
That is right. A counter weight could look like a lump of material also.
If it is there it will be on the back of the flywheel.
Thanks man, I've never really messed with 4 speeds before, so does being a internal balanced flywheel mean the engine has been balanced?
 
Auto Transport Service
Back
Top