3spd no syncros, tiny, bad gear splits.. 4 speed, pleasure to drive. Bellhousing will need to be changed when going to 4spd. You have the option of changing flywheel and clutch as well. finger clutch in 3spd vs diaphram in 4spd. Some people like the 3spd flywheel cause it has more mass when going at low rpm.
you can run your 3spd case in back of a 4spd with proper input gear and bearing in back. takes a B210 datsun wheel bearing in back and a 16 spline transition gear to swap. gets you lower low range.
Same clutch master and slave, normally on 4spd the slave is on pass side but it can mount on either side. If you get one of the adapters from 350 to 4spd which is what you would use with v8 you dont need the bellhousing issue solved when going to 4spd. when converting an F 3spd to a 2f 4spd you need differernt bellhousing etc.
In your case you need the transition bellhousing, probably new clutch disk then determine if you want 4spd or 3spd tcase. Lots of options. I'll give you a 4spd (H42) if you buy me a transition gear as well. You pick up in blue springs. If you choose to hang around for a lesson on tcases I"ll dig some out and show you parts of the "stash". I'm actually off all weekend. (which isn't normal)
To do this cheaply i'd grab ed's bellhousing, my 4spd and I can walk you thru the transition gear stuff. (you can totally take the tranny home with you now, get me stuff whenever) that didn't sound right did it?
(found it. was looking for the gear info..)
Cruiser Outfitters
I've forgotten soo much of this stuff over the years.. Sorry!
I'm debating putting 3spd case in my 45.. Just not sure at the moment.. Soo many pieces in my pile to choose from. And no I'm sorry the 45 isn't at the house..
Added bonus.. You can renew or sign up for TLCA at the "Main Office" while your there. And pick up those corners you were wanting.
Or if you want to keep 3spd transmission.. and it dies, I will have a spare i'll give you probably end of this year. Not pulling it till I pull engine/drivetrain out of 45.
Options are good.. You have to make the choice of what you wanna do.
YOu running rams horn headers or block hugger? I can probably dig up pn's for walker exhaust pipe that goes under pan with ramhorn if you need. Pretty sure I have spare ramhorn headers at house as well I hope to never need. Can you tell I have WAY more junk than i'll ever need? If I can find good homes in the club for this stuff I'll be happy to get the space in the garage back.