I have a 3.03 tranny with a 6.5” long, 10 spline, 1 1/16” diameter input shaft. This is for my ‘66 200 engine. The shaft isn’t long enough to go into the pilot bearing. It should be about 1/2” longer. Is there a longer input shaft for this application? Thanks for the help in advance.
3.03 input shaft
Jamstang
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I have a 3.03 tranny with a 6.5” long, 10 spline, 1 1/16” diameter input shaft. This is for my ‘66 200 engine. The shaft isn’t long enough to go into the pilot bearing. It should be about 1/2” longer. Is there a longer input shaft for this application? Thanks for the help in advance.
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The length sounds correct. Are you using a '67+ bellhousing? If it truly IS a bit short, you can use a wider pilot bearing... a 6203-ZZ is 10mm wide, a 63003-2RS1 is 14mm wide and a NAO 17X35X16 is 16mm wide.
Yes I have a C7ZA-6394-A bell. So I have the correct shaft, just need a thicker bearing. Never thought of that. Awesome help Woodchuck
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You shouldn't NEED a thicker bearing.... '60-68 sixes all used the same .502" thickness bushing.
How far out from the block surface should the bearing sit? Or how far out from the end of the crank should the bearing sit? The crank does stick out a bit past the block. Thanks
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Depends on the bushing (or bearing). The end of the crank is machined to accept the bushing and it goes all the way in to the lip, or back. I've seen bushings that are flush with the pilot hole in the crank and bearings that sit a bit "proud" and some even having shoulders.
I guess one of my questions would be HOW you know the input isn't going far enough in to the pilot....
Yes there is a long and short input shaft. The end of the shaft that goes in the bearing is longer on the small block and shorter on the big block. About 1/2". You could have a big block input?
Hey fellow Canadian! It’s 1 1/16”. I think the BB was 1 3/8”.
I did a mock up with a dummy shaft and it doesn’t penetrate the bushing. I think it’s supposed to go in 3/8” minimum?
The 390 cars came with a 1 1/16" 10 input and a wide ratio gears set. The 428 cars came with the 1 3/8" 10 input with a close ratio gear set. The intup shaft has the short input nub into the pilot bushing on both the 390 and 428 input shaft. The small block cars came with the long nub input.
Oh. Okay. Well it’s 6.5” long and it’s a 6 cylinder transmission. I think it’s the correct shaft for the transmission. Is there a 7” input out there?
So I did so looking and the 66 200 would have come with a Dagenham 4 speed. Not the same as a 3.03. Your 3.03 Top Loader would have a tag on the right side of the case with the build code for which car it came from. What does yours say?
Some more looking and there are short and long shaft Dagenham's also and some different depth bellhousings. So I would say you could have a mismatch which is causing your problem.
It’s from a 1970 mustang 200, in my ‘66
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So, I'm guessing you placed a straight edge across the bellhousing and measure the depth to the end of the shaft, then added the thickness of the block separator plate to that number, then placed a suitable "tool" against the engine block bellhousing flange and measure the distance to the pilot bearing? I don't understand how you can "mock up" a dummy shaft and accurately determine its longitudinal position without some basic measurements first.
I installed the bell over the plate and stuck a metal rod 6.5” into the bell and looked through the fork hole and saw the rod wasn’t in the bearing hole
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Did you measure the distance between the end of the input shaft and the mounting flange of the transmission?
Yes. 6.5” How far into the bushing is adequate?
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I'd be satisfied with anything over 1/4 inch. That'd be 1/2 or more of the bushing width of 1/2 inch. A needle roller bearing would get you even more... most are about 3/4 inch wide.
I think I figured out the issue. The bushing in place currently is flush with the crank. I ordered a new bushing just to see what it looked like and this one sits 1/4” out from end of crank. So that would give me 1/4”-3/8” of contact. The first 1/4” of input shaft is tapered so that doesn’t count. Hopefully it will work. Thanks for the help again.
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