I am helping a friend get a Model A on the road he bought as a project car from this site. It has a GM 400 transmission in it that has the yoke attached to the tail shaft with a large NUT. So first ? is what was it out of? 2nd ? is can the tail shaft be changed out to take a slip yoke? Thanks for any and all HELP
I believe those are from a truck with a 2 pc driveshaft. there is a slip joint where the 2 shafts meet so one at the trans tail isn't needed. I don't know why it couldn't be changed, but I can't tell you exactly what needs to be done.... good luck, someone here will know
I have one from a truck with the bolt on yoke and picked up a special slip yoke from Denny's Driveshafts. https://www.dennysdriveshaft.com/p1..._slip_yoke_1310_series_32_splines_fits_t.html Edited with a better link to the correct page.
The output shaft on a truck t 400 has a ridge on it which does not allow the passenger car yoke to fully seat in it. Yes the yoke can be shortened to give 3/4" to 1 " of free travel , I have done this several times . I can remember Tim who used to own San Diego Driveline asking customers who would bring in measurements for t400 driveshafts asking ...is it a truck t400 or a car t400?
Lumpy is correct, you can't just change the seal and make a car yoke fit, the output shaft has an O-ring on it to keep the fluid in, when you look at the bolt in yoke you'll see it's not splined to the end so it can go over the O-ring. Another supplier for the slip yoke that will fit that trans is Inland Empire Driveline https://www.iedls.com/ The conversion yoke from Inland Empire on the right (about $80 bucks) and regular car non bolt in yoke on left, you can see how it's not splined all the way to the end and it's overall shorter.
I think he said it was held on by a large nut, not a bolt. That is something different. Maybe a large truck or motorhome trans. I’ve never seen one with a large nut unless it had a parking brake on it. Those had straight cut gears if I’m not mistaken.