I found this Muncie 4 speed on Ebay and I was wonndering if it would be a
good buy for my 66 Chevy Pickup
what's in it now? What's the truck's intended use going to be?
Is it a good tranny, the Muncie M20 was knick named the rock crusher
for good reason, but your buying site unseen, and shipping is going
to be fun, these things had cast iron cases and weigh a ton.
I believe you have the wrong transmission. The "rock crusher" was a M-22,
aluminum case, with a fine spline shaft also straight cut gears iirc. But it
was a long time ago.
Your right the M22 was the rockcrusher, so named because of the noise they
because they were strong trannies, mated to many big blocks from the
Al's most diffinetly correct, they were not straight cut, but did have about
half the angle the M20
and M21 had. The M22 was designed for road racing, not drag racing. The 21
and 22 were close ratio trannies, as such you need low gears in the rear if
you want to get off the line with it. The lower angle was to reduce
friction and heat, and less thrust on inner components.
Myself, personally, I will take a Saginaw Super T-10 over a Muncie any day.
If this truck is going to be a daily driver I want drive a truck not a car
kinda thing, I would look at 92 or newer T-5 trannies for the over drive,
the reason I asked what's the truck going to be used for.
My first V-8 Vega was scratch built in Germany in 77, she would wheel hop
one litre beer bottles, and the Muncies grenaded, twice(along with more than
a few sets of spider gears). The Saginaws held up. when I got to the states
with her, I got a set of Lakewood traction bars and solved the wheel hop
A super T-10 is not a Saginaw, it's a Borg Warner, now Richmond gear. The
only car 4 speed with straight cut gears that I ever saw were Ford top
loaders with after market gear sets.
http://www.gearboxanddifferentials.com.au/ford.html Years ago Doug Nash sold
them. Of course that does not mean some other transmissions don't have them,
but I've seen a heck of a lot of transmissions. The M22 was used in many
drag race cars. I had a few of them. The weak spot was the output shaft.
They used the TH-400 yoke but they broke right at the speedometer gear,
where the snap ring groove was. I broke one going in to high gear:)
BTW: the five speed T5 manuals are great for a truck. Most have a fairly low
first gear, and they have overdrive.
I need an editor and proof reader, please insert "or" between Saginaw and
As to used in the drags, I didn't say it wasn't, only that it was designed
for road racing.
Alas because of health considerations the new Vega in process in the garage
will get an
automatic, upside will be a lot easier on the rest of the drive train I
think(or perhaps hope)
If we were just going to take her to the drags, probably a slush box, but as
I want a cruiser
most likely a 700R4. There is a Saginaw under the work bench though......
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