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#31986 01/14/2004 4:46 AM | Joined: Dec 2002 Posts: 29 Member | | Member Joined: Dec 2002 Posts: 29 | Currently I have a SM420 Muncie 4-speed, and I was wondering if the SM465 has higher gears than the SM420. I assume that both have a 1:1 in 4th gear? Is there another good heavy-duty truck tranny I can swap in to get higher gears? Any 5-speeds? Thanks for any help.
'48 Chevy 2 ton Flatbed
(daily driver)
'70 BMW 2002
My truck is older than my parents!
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#31987 01/14/2004 8:14 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | The SM-465 is very similar to the 420 in gear ratios, and is a 1:1 transmission in 4th. The 89MM tranny has an overdrive 4th.
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A lone amateur built the Ark. A large group of professionals built the Titanic. | | |
#31988 01/14/2004 9:47 PM | Joined: Apr 2002 Posts: 1,571 Shop Shark | | Shop Shark Joined: Apr 2002 Posts: 1,571 | You could always find an NV4500 - late model five-speed heavy-duty truck transmission. Overdrive fifth. | | |
#31989 01/15/2004 1:55 AM | Joined: Dec 2003 Posts: 58 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2003 Posts: 58 | the SM 420 has the lower 1st gear than the 465and if your using it in that Willys they are almost indestructable and will give you the crawl ratio you want. however the parts are getting a little hard to find when you break something, the 465 is a little bigger and stronger and the parts are available but 1st gear is not as low . Both trans are 1to 1 in high gear so no advantage is picked up on the big end. The NV 4500 is the hot ticket with compound low and overdrive. But it is expensive. Tony | | |
#31990 01/15/2004 2:42 AM | Joined: Nov 2003 Posts: 53 Member | | Member Joined: Nov 2003 Posts: 53 | The SM420 has a 7.06 first gear and the 465 has a 6.55. | | |
#31991 01/15/2004 4:20 AM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | For tranny facts go to the Novak Tranny Page . The 465 is bigger and heavier, requires machining out the round hole in the bell housing to put on an older GM truck. If this is for your flatbed, Jolly has pu an auxillary gearbox in one of his trucks. Here's the link 12 Speed 1 ton
Fred
52 3600
69 C-10
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