four speed? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69halfton · 09-17-2008, 09:29 PM

just sort of thinking about a winter project for now.

how many of you guys have made the swap from an automatic to a standard tranny, specifically a muncie M-21 or M-22?

did you need the high-hump tranny tunnel, or did it fit with the low hump?

where did you purchase your transmission?

ballpark, how much did it cost to make the swap?

what shifter did you use (I've herd that a shifter for a 55 chevy with a bench seat works, but I can't actually remember.)

Mike C · 09-17-2008, 09:41 PM

I've made the swap in cars. Pretty straight forward. It will fit in any spot that the 3 speed will fit, might even use the same driveshaft, depending on the transmission.

hchad18 · 09-17-2008, 09:42 PM

The low hump did not work for my application. Bagged w/ post 73 front crossmember. An ear of the tranny was hitting the tunnel, not by much. I made my own. I used a hurst indy shifter with a short stick, it is perfect with bucket seats. With a bench seat you would need a longer shifter w/ a bend. Also I believe there are two different mounting brackets for the Hurst shifter. One that mounts it up high, which brings it way over the tunnel and one that mounts it to the side of the tranny. I have a friend that has a 56 chevy with the low one mine has the high one so I made a console. You can get both brackets and shift sticks through summit. In the picture the top of the boot is at the top of the shifter. Its a muncie 21.

larry may · 09-17-2008, 09:44 PM

I used high hump, but aMuncie m20 21 22 may fit okay under the low hump. Got my transmissions from muscle cars from the past . Saved them all these years switching from one hot rod to another. One of the members from Arizona had posted all you needed to install everything for around 1500 dollars. may have been 72 RS SS. not sure now. Not to bad of a price for a package deal. The parts I have have been aropund for a lot of years so not real sure what it would cost from scratch. But 1500 is a good price imo. But that is used parts. Good luck .Larry

hchad18 · 09-17-2008, 11:04 PM

I didnt say before but I looked around before I bought this m-21 from a friend for 500.00 w/ no bellhousing. They seem to be going for around 500-700 dollars depending on if they come with a shifter or not. Then of course you'd need flywheel, pressure plate ,clutch, bellhousing, pedals.

**special-K** · 09-18-2008, 07:01 AM

The car 4-speeds will fit under the low-hump.I have slipped them in and even used the same hole that was cut in the floor for a 3spd floor shifter,like the "Indy" shifter.There is a Hurst shifter made for these trucks that will clear the bench seat.

*chevy29267truck* · 09-24-2008, 10:33 PM

my 1967 chevy 3/4 ton truck when i got it had a 3on the tree i put in a 4 speed 4 in the floor i add the high hump i got a used four speed for $ 100 somthing or $200 somthing oh ok guys dont let any one take your four speed shifter,rod if you let me know and i give you the info how too get one

09-17-2008, 09:29 PM	#1
69halfton Registered User Join Date: Apr 2007 Location: King City, Ontario, Canada Posts: 974	four speed? just sort of thinking about a winter project for now. how many of you guys have made the swap from an automatic to a standard tranny, specifically a muncie M-21 or M-22? did you need the high-hump tranny tunnel, or did it fit with the low hump? where did you purchase your transmission? ballpark, how much did it cost to make the swap? what shifter did you use (I've herd that a shifter for a 55 chevy with a bench seat works, but I can't actually remember.) __________________ - Jason If you can turn, Youre not going fast enough. Favorite caption: first car to 200 mph in the 1/4 mile, no parachute, drum brakes all the way around.. ..back when men were men.

09-17-2008, 09:41 PM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,727	Re: four speed? I've made the swap in cars. Pretty straight forward. It will fit in any spot that the 3 speed will fit, might even use the same driveshaft, depending on the transmission. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

09-17-2008, 09:42 PM	#3
hchad18 Registered User Join Date: Mar 2006 Location: AZ Posts: 372	Re: four speed? The low hump did not work for my application. Bagged w/ post 73 front crossmember. An ear of the tranny was hitting the tunnel, not by much. I made my own. I used a hurst indy shifter with a short stick, it is perfect with bucket seats. With a bench seat you would need a longer shifter w/ a bend. Also I believe there are two different mounting brackets for the Hurst shifter. One that mounts it up high, which brings it way over the tunnel and one that mounts it to the side of the tranny. I have a friend that has a 56 chevy with the low one mine has the high one so I made a console. You can get both brackets and shift sticks through summit. In the picture the top of the boot is at the top of the shifter. Its a muncie 21. Attached Images

09-17-2008, 09:44 PM	#4
larry may Senior Member Join Date: Jul 2005 Location: MISSOURI Posts: 3,256	Re: four speed? I used high hump, but aMuncie m20 21 22 may fit okay under the low hump. Got my transmissions from muscle cars from the past . Saved them all these years switching from one hot rod to another. One of the members from Arizona had posted all you needed to install everything for around 1500 dollars. may have been 72 RS SS. not sure now. Not to bad of a price for a package deal. The parts I have have been aropund for a lot of years so not real sure what it would cost from scratch. But 1500 is a good price imo. But that is used parts. Good luck .Larry __________________ The biggest problem people have, is other people Thou shalt be cool and not hassle Be a site supporter. The heart of the wise inclines to the right, but the heart of the fool inclines to the left." Ecclesiastes 10:2

09-17-2008, 11:04 PM	#5
hchad18 Registered User Join Date: Mar 2006 Location: AZ Posts: 372	Re: four speed? I didnt say before but I looked around before I bought this m-21 from a friend for 500.00 w/ no bellhousing. They seem to be going for around 500-700 dollars depending on if they come with a shifter or not. Then of course you'd need flywheel, pressure plate ,clutch, bellhousing, pedals.

09-18-2008, 07:01 AM	#6
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: four speed? The car 4-speeds will fit under the low-hump.I have slipped them in and even used the same hole that was cut in the floor for a 3spd floor shifter,like the "Indy" shifter.There is a Hurst shifter made for these trucks that will clear the bench seat. __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-24-2008, 10:33 PM	#7
chevy29267truck Account Suspended Join Date: Sep 2008 Location: Alva Florida Posts: 668	Re: four speed? my 1967 chevy 3/4 ton truck when i got it had a 3on the tree i put in a 4 speed 4 in the floor i add the high hump i got a used four speed for $ 100 somthing or $200 somthing oh ok guys dont let any one take your four speed shifter,rod if you let me know and i give you the info how too get one



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