C4 to rebuild or not to rebuild?

69 Capecod

New Member
Aug 30, 2004
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Cape Cod MA.
I blew my C4. The cost to buy a stock rebuilt one is $ 600. I have a local guy thats going to do it for the same price. He said he can build it stock,agressive or so the thing cherps in every gear. I picked the agressive. He is going to put a shift kit in it and some other things. Has anyone here ever have there tranny rebuit and was this a option for them. When I get it back I will post the spec. But I have not seen this post here yet. I am wondering if this is a good thing or not. I have a 69 coupe with a 302 and 9 inch rear. Thanks for the info guys.
 
Go with the agressive shift kit, you'll like it. What's not to like about stiffer shifts. IIRC, it's also easier on the clutches because it shifts faster. I had an early model C4 with a manual/automatic valve body that I really liked.

One thing to be away of is if it's an early or late model. You can tell by how many bolts are on the valve body. 8-bolt is early, 9-bolt is late. For some reason, with some (random) early model c4's, it won't hold 2nd gear with a manual/automatic valve body. It shifts to third on it's own. This may be the case also with the regular automatic valve body. It bugged me when racing because it would short shift 2nd all the time.

Now, I'm running an Art Carr C4 and it's great. It's got a reverse pattern manual valve body with a trans-brake. It spins in all shifts.
 
Well I got my car back today. All I got to say is ohhh my god what a dirffrents the shift kit made. I didnt get the specs, But I do know it a B&M Shift kit that was installed in the tranny. Now I just got to get a good shifter and I am good to go. (on the drive train that is) does anyone reccomend a good shifter. When I was a kid the best one was soppose to be hurst shifter. And I know its a matter of taste. and the rebuild does look pretty under thr car makes me wont to clean up the rest of it.