The Dodge Challenger Message Board

is there any variation in input shaft length? The 23spline late B/E body box I'm just about to install has an input shaft of approx 7 3/4" long but thats too short to go inside the pilot bush I checked the A body box that was in there and the input shaft on that measures approx 8 1/2" long.

I can fairly easily swap in the input shaft out of the existing box I think, just amazed it wouldn't slide straight in

............. and no bloody jokes about how easy it is to have an automatic

What about the depth of your bell housing? It is supposed to be 7,38" according to a book of mine.

You sure some dick didn't cut it short at some point? I have seen that before when someone has tried to fit a manual box to an engine that came with an auto transmission. Not realising they need to fit a pilot bushing to the back of the crank.

dave-r wrote:You sure some dick didn't cut it short at some point? I have seen that before when someone has tried to fit a manual box to an engine that came with an auto transmission. Not realising they need to fit a pilot bushing to the back of the crank.

Yeah I read up on some topics on the web last night after I posted this, some cut back to fit Shivvys etc, some butchered for various stupid reasons

I read of a Dakota pilot bushings that fills it but I think I'm just best to swap over the input shaft from my existing box, the first gear is set on the shaft so I may have a different ratio than stock but I'm sure they fit any box regardless of the ratio, I'll check with the tech at Brewers

I'll measure the bellhousing Christer but I have both boxes side by side and the difference in the nose of the shaft is obvious

I think this is the answer.............. fit a roller type pilot bearing that fills the large recess on the crank flange but goes farther back fromthe tip of the input shaft by about an inch
Panic over

I wouldn't put my last buck on it, but does Chyrsler have a different crank for an automatic than it does for a standard transmission?
I know that Chebbies have (at least during my time working for a GM dealer). 1 crank for an automatic ordered vehicle and one for a standard transmission vehicle.
Just a thought. One must be careful as the input shaft must be supported at the front of it.

transman

No Chrysler just cast a hole in the end of all their cranks. Then machined it out for the bushing on the manual trans cars. You can buy a bushing that fits into the un-machined crank hole.

In the August 2011 issue of Mopar Muscle, they were building up a big block engine. Instead of using a TF727 they were going to install an 833 4 speed. The crank had been for an automatic, and of course the problem with the crank being drilled for the converter up needed to be addressed. What they used was a National bearing, part number FC69907.1.

transman

Yep, and here it is installed, piece of cake, the same bearings used on the Magnum 318 and 360 engines, thanks for the part no., i might put some into stock