There is one (1) choice of manual transmission for the early Rambler six: the Borg Warner T-96, described elsewhere. Though reliable enough if you do not abuse it (by 1960 standards, keep in mind) it's fairly terrible overall. (The overdrive model has it's own virtues however.) The T-14 will fit the bellhousing and clutch, and is not a bad transmission at all -- "late model" (OK, 1968) and synchromesh in all gears. But for the effort involved in fabricating a driveshaft, there's no real gain substituting one hard-to-find part for another.
The Borg Warner T-5 however is common as hell, has been in production for 20 years, and is an easy junkyard find, and has a huge aftermarket. Five forward speeds, 5th is overdrive. It's a wildly popular transmission to swap, and has lots of specs available.
Most people are worried about exceeding torque specs with the various models but that's not a problem behind a Nash six, so we get a bigger range of choices. See this Ford Muscle Community T-5 identification chart for an overview and specs.
Random notes to assemble into a page.
|T-96||T-5 short||T-5 mid||1994-up T-5|
|input shaft length||7.0 (measured)||7.18||7.41||7.85|
|bearing retainer major diam||4.25||4.91||4.91||4.91|
|splines||10 x 1"||10 x 1-1/16"||10 x 1-1/16"||10 x 1-1/16"|
RESOURCES Ford T5 specs (this donor) http://www.ttcautomotive.com/English/products/T-5.asp GM T5 specs (just fyi) http://www.adchevy.com/techtips/t5list/ Mustang Depot adapter, looks best so far part MD-401-2103 http://www.mustangdepot.com/OnLineCatalog/Transmission/t5-conversion.htm 64 american with v8, has good info though http://schwallers.com/T5Swap.htm bearing retainer: schwaller on AMCforum re: bearing retainer issues and steel replacement from "4wd Hardware" http://theamcforum.com/forum/t5-swap_topic10579_page4.html Part Number: OAI18885.02 * 1982-86 CJ http://www.4wd.com/productdetails.aspx?partID=11159 "T4/T5 Bearing Retainer" $36 See photo http://cars.grantskingdom.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=2135&g2_serialNumber=1 "The 1 on the right is the new AMC Jeep T5 retainer, the left 1 is the one off the Ford T5" it's the base, not the tube, that interferes with TO lever. See photos on amcforum; it's abundantly obvious if you mock up the parts and the T-96 retainer will not have this problem shoulder. If it's usable, likely not. javelin 401 t5, same text as above? but additional info eg. speedo cabpe http://mysite.verizon.net/amxjavelin/t5swap/t5swap.html speedo cable: same as AMC t10? speedo cable: check T150. Ford. clutch disc: T150 (Ford trans...) has same splines (check diam and splines) PS: T-5 will drop onto T-150 bell, clutch, etc FWIWBIG QUESTIONS: Q: Will T5 hang off mounting ears w/o xmember OK? A: not a problem, less mass than T-96! Q: How bad is tunnel clearance Q: location of output viz. pinion angle Q: note schwaller page re: bearing retainer issues Q: Shifter location relative to mounting face Q: speedo setup? Q: clutch disc Q: will 9" clutch clear BH Q: TO bearingCalPonyCar adapters www.calponycar.com TRA-657-627 6cyl TRA-650-526 -423 is V8 only