Your donations help keep this valuable resource free and growing. Thank you.
|
M35 vs M40 Transmission |
Post Reply |
Author | |
RHarmon
AMC Fan Joined: Aug/01/2022 Location: 72543 Status: Offline Points: 3 |
Post Options
Thanks(0)
Posted: Aug/03/2022 at 2:08pm |
How to tell the difference between a M35 and a M40 transmission. I have a 1964 Rambler American 440H, the 196 I6 was swapped with a 290 V8. I'm trying to tell if the transmission is the M35 that came with the I6, or the M40 that came with the v8.
|
|
ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11535 |
Post Options
Thanks(0)
|
Is the Borg Warner tag on the side of the tranny? The '64 M35 would have used the TV cable (and would not have a small vacuum modulator visible). The M40 would have the vacuum modulator, and I would think if someone swapped in a 290, it's most likely they swapped in the M40 also.
|
|
74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
|
RHarmon
AMC Fan Joined: Aug/01/2022 Location: 72543 Status: Offline Points: 3 |
Post Options
Thanks(0)
|
How can I tell what rear end is in the vehicle?
|
|
ramblinrev
Moderator Group Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11535 |
Post Options
Thanks(0)
|
So your '64 would have come with a "big Nut" rear end, meaning there is a really large nut where the drive shaft connects to the rear end. If that's still there, you have the 6 cylinder rear end. An AMC 20 rear end (that would come with V8 cars), has a 10 bolt, round cover, with no drain plug in the cover. I think the 6 cylinder in '64 would have had a drain plug in the cover.
|
|
74 Hornet Hatchback X twins (since 1977)
62 American Convertible (still worth the $50 I spent in 1973!) AMCRC #513, AMO #384 70 AMX 360 4-speed (since 1981) |
|
farna
Supporter of TheAMCForum Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19676 |
Post Options
Thanks(0)
|
That's correct. ALL AMC15 (the six cylinder axle) axles have a drain plug in the cover, the AMC 20 does not. I wouldn't be concerned if you have the six cylinder rear axle. The AMC15 is tougher than most think! If you're going to be drag racing or "horsing around" with it a lot you will want to change it. But if mainly cruising around and only on very rare occasion lighting the tires up, you should be fine for a long time with a stock or near stock 290. DO take the time to loosen the axle nuts then torque back down to 250 ft/lbs. Might take 400-500 ft/lbs to break stuck nuts free, but that's not the same as properly torqued. Unless you know for sure the axle nuts have been re-torqued (hubs off for bearings and seals?) you really need to do it. Even a 195.6 OHV will spin a hub that hasn't been torqued down in 50+ years -- several have done it! The axle ends stretches ever so slightly with time -- enough time and it stretches enough for the hub to spin.
|
|
Frank Swygert
|
|
vinny
Supporter of TheAMCForum Joined: Jan/05/2012 Location: Calgary Status: Offline Points: 2837 |
Post Options
Thanks(0)
|
Yeah that was the demise of my AMC15 when I spun a hub over 40 years ago. I didn't know they needed re-torquing. As far as re-torquing the head I didn't know anything about that either but it never gave a problem. Perhaps it had been re-torqued before I got it.
I know that a 67 American has an M37 which has the electric kick down. Those torque converters I have been told have a different spline count (one tooth different) than the older M35's and are not interchangeable. Probably the M40 TC would also not fit to an M35. FYI the ring gear diameter on the 196 TC was 12 1/2". Ring gear dia. on a 232 is 13". I don't know what it would be on the 290. |
|
BBO Steve
AMC Fan Joined: Apr/18/2016 Location: NC Status: Offline Points: 23 |
Post Options
Thanks(0)
|
M40 290 floor shift auto. Anyone have parts, I need the shift lever that goes through the side of the case and connects to the lever from the shifter.
|
|
Midnight Rambler
AMC Addicted Joined: Jan/17/2011 Location: SoCT Status: Offline Points: 1670 |
Post Options
Thanks(0)
|
The M40 would be water-cooled, check the lower left side of your radiator for transmission cooling lines. If not, but you have a vacuum modulator, it's an M37. If it has the cable, it's an M35.
|
|
'66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
|
Post Reply | |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |