Muncie Rebuilding

[Dick S.]

I am looking for a reputable person-(shop) to totally rebuild a muncie 4speed and change the gearing to a m-21 close ratio from a m-20 wide ratio. Can anyone assist me?

[Patrick B.]

Re: mUNCIE REBUILDING

Try Ed Hartnett 4 Speeds in Landsdowne, PA. 610-625-9381

[Jimmy G.]

Re: mUNCIE REBUILDING

My question is why you want to go from a 2.42 to a 2.2 first gear Wide ratio gear boxes drive a lot better in my opinion. I even changed my 60 the other way

[Bill O.]

Re: mUNCIE REBUILDING

I don't know where you are, but the first two I would call would be Paul at 5sppeds.com in South Florida, or Larry at D and L Transmission on Long Island. Two great guys who have both done work for me. I highly recommend either one.

Bill

[Timothy B.]

Re: mUNCIE REBUILDING

I agree with post #3, what's the reason you want to do away with the wide box, what HP engine and rear axle ratio are you running? IMO, if you are driving the car on the street with 3.55 or 3.36, you will like the wide ratio transmission better.

[Joe L.]

Re: mUNCIE REBUILDING

I agree with post #3, what's the reason you want to do away with the wide box, what HP engine and rear axle ratio are you running? IMO, if you are driving the car on the street with 3.55 or 3.36, you will like the wide ratio transmission better.

Timothy----


Yup!

[Scott M.]

Re: mUNCIE REBUILDING

With the cost of a new gearset and the labor, potentially bushing the case for worn shaft, you might want to consider just buying a new Autogear Muncie 4 speed and shelving the original.

[Dick S.]

Re: mUNCIE REBUILDING

I agree with post #3, what's the reason you want to do away with the wide box, what HP engine and rear axle ratio are you running? IMO, if you are driving the car on the street with 3.55 or 3.36, you will like the wide ratio transmission better.

The car is a L-72 with a Tremec TKO 5 speed and a 3.70 rear. First, my low gear is real low & short coming off a light-(10.62:1)-and second, the 2-3 shift going thru the gate on the Tremec is a bad nightmare. The motor has more than enough bottom end Tq to start in 2nd if I wanted to. Thats why I want to go to a M-21

[Timothy B.]

Re: mUNCIE REBUILDING

Dick,

The 10.62/1 sounds like the low/low I had in my Mack truck, are you sure about that. What ratio is the second speed gear, I just don't want you to spend $$ and not be happy.

[Patrick H.]

Re: mUNCIE REBUILDING

The car is a L-72 with a Tremec TKO 5 speed and a 3.70 rear. First, my low gear is real low & short coming off a light-(10.62:1)-and second, the 2-3 shift going thru the gate on the Tremec is a bad nightmare. The motor has more than enough bottom end Tq to start in 2nd if I wanted to. Thats why I want to go to a M-21

Change your rear end gear. It's cheaper and you'll get better mileage to boot. Set your original pumpkin aside for the future.
Otherwise your next thread will be about how your car revs too fast on the highway.

[Scott M.]

Re: mUNCIE REBUILDING

Patrick, it sounds like part of the problem the OP is having is with the crummy 2-3 shift known with the Tremec, you can not speed shift them like you can with a Muncie but they can be modified with a face plated gear set for speed shifting by Liberty Transmissions.

[Patrick H.]

Re: mUNCIE REBUILDING

Patrick, it sounds like part of the problem the OP is having is with the crummy 2-3 shift known with the Tremec, you can not speed shift them like you can with a Muncie but they can be modified with a face plated gear set for speed shifting by Liberty Transmissions.

That may be, but going with an M21 will make his "low gear is real low & short coming off a light" problem change to a "my Corvette screams at 3500rpm on the higway and how can I fix this" problem.
Sounds like he needs to change the shifter as you suggest and swap out his rear end.

[Scott M.]

Re: mUNCIE REBUILDING

Or you can do an Autogear M21Y 2.199/1.506/1.000/.859 ratios http://autogear.net/ag_archive/order...eedpricing.htm

[Patrick H.]

Re: mUNCIE REBUILDING

Or you can do an Autogear M21Y 2.199/1.506/1.000/.859 ratios http://autogear.net/ag_archive/order...eedpricing.htm

Yes, but again more expensive.

[Dick S.]

Re: mUNCIE REBUILDING

Dick,

The 10.62/1 sounds like the low/low I had in my Mack truck, are you sure about that. What ratio is the second speed gear, I just don't want you to spend $$ and not be happy.

The 10.62 is the product of the 1st gear (2.87) times the rear (3.70).

The motor is built using Callies crank & rods, Keith Black Icon pistons, Ultradyne mechanical flat lifter cam, Comp promag rockers, Beehive springs, Titanium retainers, Big SS valves, MSD, QFT-830 carb, Aeromotive feul system, Plus ARP studs everywhere. It's at 461 CID and made an easy 494 HP @ 6800 & 479 TQ @ 3600 on the dyno. It will run 3000 @ 70 MPH all day in 4th gear.

The only problems I have which prompted me to begin writing
is the short 1st gear and the crumby 2/3 shift.