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M35 vs M40 Transmission |
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RHarmon 
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Joined: Aug/01/2022 Location: 72543 Status: Offline Points: 3 |
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 Topic: M35 vs M40 TransmissionPosted: Aug/03/2022 at 2:08pm |
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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.
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ramblinrev
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Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11528 |
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Posted: Aug/03/2022 at 4:44pm |
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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.
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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) |
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RHarmon
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Joined: Aug/01/2022 Location: 72543 Status: Offline Points: 3 |
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Posted: Aug/08/2022 at 7:50am |
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How can I tell what rear end is in the vehicle?
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ramblinrev
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Joined: Dec/28/2008 Location: Wisconsin Status: Offline Points: 11528 |
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Posted: Aug/08/2022 at 10:24am |
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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.
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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) |
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farna
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Moderator Lost Dealership Project Joined: Jul/08/2007 Location: South Carolina Status: Offline Points: 19675 |
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Posted: Aug/08/2022 at 8:11pm |
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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.
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Frank Swygert
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vinny
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Posted: Aug/11/2022 at 5:49pm |
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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. |
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BBO Steve
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Joined: Apr/18/2016 Location: NC Status: Offline Points: 23 |
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Posted: Nov/25/2022 at 9:42pm |
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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.
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Midnight Rambler
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Posted: Nov/27/2022 at 4:13pm |
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.
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 '66 American 440 Convertible 290/M-40/AMC 20 3.15/PS/PB '04 Jeep Wrangler X Rocky Mountain Edition 4.0 5sp |
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RHarmon wrote: